PITTSBURGH COLD TEMPERATURES	
Based on records since January 1871, updated monthly.

 

 


	LONGEST PERIODS WITH TEMPERATURES ZERO DEGREES OR LOWER
	(consecutive hours)

 52 Hours    6am  Jan 18, 1994 - 10am Jan 20, 1994  Lowest -22  
 51 Hours    6am  Dec 24, 1983 - 9am  Dec 26, 1983  Lowest -12
 50 Hours    10am Jan 16, 1977 - 12pm Jan 18, 1977  Lowest -17
 41 Hours    8pm  Jan 22, 1936 - 12pm Jan 24, 1936  Lowest -16 
 37 Hours    10pm Jan 23, 1963 - 10am Jan 25, 1963  Lowest -18
 37 Hours    10pm Jan  7, 1970 - 11am Jan  9, 1970  Lowest  -5
 37 Hours    12am Jan 10, 1982 - 11am Jan 11, 1982  Lowest  -9 
 35 Hours    6pm  Jan 16, 1982 - 5am  Jan 18, 1982  Lowest -18

	LONGEST PERIODS WITH TEMPERATURES 32 DEGREES OR LOWER
	(consecutive days)
	
          33 Days    Dec 26, 1976 through Jan 27, 1977 
          26 Days    Jan 25, 1979 through Feb 19, 1979
          22 Days    Jan  8, 1985 through Jan 29, 1985
          22 Days    Dec  7, 1989 through Dec 28, 1989
          19 Days    Jan 11, 2003 through Jan 29, 2003
          18 Days    Dec 18, 2000 through Jan  4, 2001
          17 Days    Feb 29, 1960 through Mar 16, 1960

	LONGEST PERIODS WITH MINIMUM TEMPERATURES ZERO OR LOWER
	(consecutive days)

        7 Days    Feb 8-14, 1899   Lowest -20
	6 Days    Jan 22-27, 1936  Lowest -16
	4 Days    Jan 18-21, 1994  Lowest -22
	4 Days    Jan 6 - 9, 1942  Lowest  -9
	4 Days    Dec 21-24, 1989  Lowest -12
	4 Days    Dec 16-19, 1989  Lowest  -7
 
                                        Coldest Days on Record
Lowest Temperatures on Record            (Lowest Mean Temps)
    -22   Jan 19, 1994                    -13   Jan 19, 1994
    -20   Feb 10, 1899                    -11   Jan 17, 1982
    -18   Jan 20, 1985                    -11   Feb 10, 1899
    -18   Jan 21, 1985                    -10   Jan 17, 1977
    -18   Jan 17, 1982                    -10   Jan 24, 1963
    -18   Jan 24, 1963                     -9   Jan 23, 1936
    -17   Jan 17, 1977                     -9   Jan 20, 1985
    -16   Jan 18, 1994                     -6   Jan  3, 1879
    -16   Jan 23, 1936                     -6   Jan 21, 1985
    -15   Jan 21, 1984                     -6   Feb  9, 1899 
    -14   Jan 22, 1936                     -6   Dec 25, 1983
    -14   Jan 16, 1977                     -5   Dec 30, 1880
    -13   Jan 16, 1982                     -5   Jan 10, 1982
    -12   Jan 10, 1875  -12 Dec 25, 1983   -4   Feb 11, 1885
    -12   Jan  3, 1879  -12 Dec 22, 1989   -3   Jan  8, 1970  
    -12   Feb 11, 1979  -12 Jan 21. 1994   -3   Jan 19, 1940           

	LOWEST MAXIMUM TEMPERATURES ON RECORD

                    -3    Jan 19,  1994                        
                    -3    Jan 17,  1982    
                    -3    Feb  9,  1899    
                    -2    Feb 10,  1899    
                    -2    Jan 23,  1936 
                    -2    Jan 24,  1963 
                    -2    Jan 17,  1977
                     0    Jan 8,   1942 
                     0    Jan 10,  1982
                     0    Dec 25,  1983
                     0    Jan 8,   1970
                    +1    Jan 3,   1879
                    +1    Jan 20,  1985
                    +2    Feb 8,   1895
                          
COLDEST MONTHS ON RECORD           COLDEST YEARS ON RECORD
   (monthly average)                  (annual average)    

11.4    January 1977                    48.0    1976
17.4    January 1940                    48.2    1963
18.0    February 1979                   48.8    1958      
18.6    January 1918                    49.0    1875
19.2    December 1989                   49.1    1960 
19.3    February 1963                   49.1    1968 
19.7    February 1934                   49.1    1981
20.4    January 1912                    49.3    1917
20.5    January 1981                    49.3    1977
20.7    January 1970                    49.4    1979
20.8    February 1875                   49.4    1962
20.9    January 1982                    49.5    1980
20.9    February 1978                   49.6    1940    


	MISCELLANEOUS STATISTICS

Minimum temperature below zero      about 5 times a year     
                                    
Maximum temperature zero or lower   about once every 10 years or
                                    9% chance in a year.

Minimum temperature below -10       about once every 5 years or
                                    18% chance in a year

	COLDEST DAYS EVER FOR EACH MONTH
	(Based on daily mean temperatures)


     JANUARY                FEBRUARY                MARCH         
-13  Jan 19 1994        -11  Feb 10 1899        8  Mar  1 1980
-11  Jan 17 1982         -6  Feb  9 1899        8  Mar  3 1943
-10  Jan 24 1963         -4  Feb 11 1885        8  Mar 17 1900
-10  Jan 17 1977         -2  Feb 17 1958        9  Mar  2 1980
 -9  Jan 23 1936         -1  Feb 22 1963        9  Mar  6 1901
 -9  Jan 20 1985         -1  Feb  8 1895        9  Mar  9 1932

     APRIL                    MAY                   JUNE         

20  Apr 18 1875          36  May  8 1947       44  Jun  1 1910
22  Apr 17 1875          36  May  9 1966       45  Jun  5 1945
24  Apr 14 1950          39  May 11 1966       47  Jun  4 1945
24  Apr 13 1950          39  May 10 1966       47  Jun  2 1956
24  Apr  1 1923          39  May  4 1957       48  Jun  3 1956  
25  Apr  5 1944          39  May  3 1929       49  Jun  7 1977
25  Apr  7 1982          39  May  1 1963
25  Apr  8 1972


     JULY                    AUGUST              SEPTEMBER       

57  Jul  5 1979          54  Aug 29 1965       42  Sep 28 1942
57  Jul  9 1963          56  Aug 31 1935       42  Sep 30 1899
58  Jul 10 1963          56  Aug 27 1885       43  Sep 20 1956
58  Jul  4 1882          56  Aug 25 1987       44  Sep 26 1928
58  Jul  1 1933          56  Aug 19 1977       45  Sep 29 1888
59  Jul  8 1984          56  Aug 14 1964       45  Sep 24 1950
                         56  Aug 15 1979       45  Sep 21 1962
                         56  Aug 13 1964


    OCTOBER                  NOVEMBER             DECEMBER       

29  Oct 29 1965           8  Nov 30 1929       -6  Dec 25 1983
30  Oct 27 1976          10  Nov 29 1929       -5  Dec 30 1880
30  Oct 26 1962          12  Nov 28 1930       -3  Dec 22 1989
32  Oct 31 1917          13  Nov 27 1930        0  Dec 10 1917
32  Oct 28 1976          13  Nov 16 1933       +1  Dec 29 1880
32  Oct 24 1937          14  Nov 22 1880       +1  Dec 24 1983
                                               +1  Dec 16 1951
	COLDEST TEMPERATURES EVER RECORDED BY MONTH
	(Minimum Temperatures)

     JANUARY                FEBRUARY                MARCH         
-22  Jan 19 1994        -20  Feb 10 1899       -1  Mar  2 1980
-18  Jan 20 1985        -12  Feb 11 1979       -1  Mar  4 1943
-18  Jan 21 1985        -11  Feb  5 1918       -1  Mar  9 1960
-18  Jan 24 1963        -11  Feb  9 1934        0  Mar  3 1943
-18  Jan 17 1982        -10  Feb 15 1875        0  Mar 11 1960
-17  Jan 17 1977        -10  Feb 17 1979       +1  Mar 15 1993                                                    
                                               +1  Mar 17 1900

     APRIL                    MAY                   JUNE         

11  Apr  1 1923          26  May  7 1970       34  Jun 11 1972
14  Apr  8 1982          26  May  2 1963       36  Jun  5 1990
14  Apr 18 1875          27  May 10 1966       36  Jun  1 1966
15  Apr 14 1950          27  May  1 1876       36  Jun  2 1966
15  Apr  9 1977          29  May  6 1968       39  Jun 22 1992  
16  Apr 17 1875                                39  Jun  8 1977
                                               39  Jun  7 1977
                


     JULY                    AUGUST              SEPTEMBER       

42  Jul  9 1963          39  Aug 29 1982       31  Sep 19 1959
44  Jul 27 1977          42  Aug 31 1976       33  Sep 24 1974
45  Jul 20 1965          43  Aug 30 1986       33  Sep 23 1962
45  Jul 10 1963          43  Aug 19 1977       33  Sep 17 1959
45  Jul  8 1984          43  Aug 18 1981       34  Sep 28 1989
                         43  Aug 15 1964       34  Sep 27 1957
                                               34  Sep 21 1962 
                                    


    OCTOBER                  NOVEMBER             DECEMBER       

16  Oct 29 1965          -1  Nov 30 1958      -12  Dec 22 1989
20  Oct 31 1887           4  Nov 29 1976      -12  Dec 25 1983
20  Oct 20 1972           4  Nov 22 1880      -11  Dec 24 1983
21  Oct 24 1969           7  Nov 27 1930       -9  Dec 30 1880
22  Oct 28 1976           7  Nov 25 1950       -7  Dec 18 1989
22  Oct 27 1979           7  Nov 21 1880       -7  Dec  3 1976
                                               
  	COLDEST AVERAGES FOR EACH MONTH
	(Based on monthly mean temperatures)

      JANUARY                 FEBRUARY                MARCH
                                              
11.4  January 1977      18.0  February 1979     26.0  March 1960
17.4  January 1940      19.3  February 1963     30.7  March 1872
18.6  January 1918      19.7  February 1934     31.4  March 1941
20.4  January 1912      20.8  February 1875     32.0  March 1885
20.5  January 1981      20.9  February 2007     32.2  March 1984
20.7  January 1970      20.9  February 1978     32.6  March 1947
20.9  January 1982      22.1  February 1947     33.0  March 1896 
21.1  January 1994      22.2  February 1968     33.2  March 1915
21.1  January 1963      22.7  February 1958     33.6  March 1940
21.4  January 1979      22.8  February 1895     33.6  March 1932
21.5  January 2003      22.9  February 1936     33.8  March 1926
21.6  January 1893      23.6  February 1885     33.8  March 1906
21.7  January 1948      24.2  February 1980     34.0  March 1883
22.0  January 2009      24.3  February 1914     34.1  March 1916
22.0  January 1945      24.6  February 1905     34.3  March 1900
22.1  January 2014      24.6  February 1901     34.3  March 1971
22.1  January 1985      24.7  February 1912     34.3  March 1969
22.2  January 2004      25.4  February 1899     34.4  March 1937
22.2  January 1961      25.6  February 1967     34.7  March 1996
22.6  January 1978      25.6  February 1942     34.8  March 1950
22.6  January 1936      25.7  February 2014
22.6  January 1875       
      APRIL                    MAY                   JUNE         

41.8  April 1874         54.2  May 1997        63.7  June 1982
43.8  April 1907         54.3  May 1967        63.8  June 1977
44.0  April 1961         54.6  May 1917        63.8  June 1972
44.2  April 1943         54.7  May 1968        64.2  June 1985
44.3  April 1975         55.2  May 1961        64.2  June 1958
44.9  April 1926         55.3  May 1984        64.6  June 1927
45.2  April 1873         55.4  May 1924        65.1  June 1961
45.3  April 1982         55.6  May 1976        65.1  June 1955
45.4  April 1936         55.8  May 1983        65.2  June 1974
45.9  April 1950         56.1  May 1966        65.3  June 1916
46.0  April 1971         56.2  May 1954        65.8  June 2003
46.4  April 1997         56.2  May 1925        65.8  June 1907
46.4  April 1904         56.3  May 2005        65.8  June 1903
46.6  April 1940         56.4  May 1973        66.0  June 1992
46.6  April 1928         56.4  May 1945        66.1  June 1928
46.6  April 1875         56.4  May 1907        66.2  June 1980
46.8  April 1953         56.5  May 1963        66.4  June 1926
47.0  April 1956         56.6  May 1971        66.5  June 1960
47.0  April 1920         56.7  May 2002        66.9  June 1965/68
47.0  April 1989         56.7  May 1994        66.9  June 1878

      JULY                   AUGUST                   SEPTEMBER
                                             
67.4  July 1976        65.3  August 1976       58.6  September 1962
68.5  July 1984        67.0  August 1927       58.8  September 1975
68.6  July 1960        67.1  August 1964       59.3  September 1871
68.8  July 2000        67.4  August 1946       59.8  September 1918
69.4  July 2009        67.7  August 1963       59.9  September 1976
69.6  July 1996        68.1  August 1977       60.4  September 1956
69.9  July 1965        68.2  August 1997       61.0  September 2006
70.0  July 1891        68.2  August 1982       61.0  September 1949
70.0  July 1947        68.2  August 1929       61.1  September 1967
70.1  July 1962        68.7  August 2004       61.2  September 1928
70.2  July 1971        68.8  August 1967       61.3  September 1966
70.3  July 1956        68.8  August 1912       61.3  September 1963
70.3  July 1979        69.0  August 1999       61.4  September 1984
70.4  July 1920        69.1  August 2000       61.4  September 1924
70.5  July 1985        69.1  August 1965       61.6  September 1888
70.5  July 1961        69.1  August 1915       61.6  September 1875
70.6  July 1950        69.3  August 1874       61.9  September 1981
70.8  July 1963        69.6  August 1985       62.1  September 1997
71.1  July 1924        69.6  August 1979       62.1  September 1917
71.2  July 1972/09     69.6  August 1971/58    62.2  September 1974

      OCTOBER                NOVEMBER                DECEMBER       

45.9  October 1976     33.1  November 1976     19.2  December 1989
46.6  October 1988     35.3  November 1873     22.4  December 1963
47.2  October 1925     35.7  November 1880     23.0  December 1958
47.8  October 1987     35.8  November 1872     23.1  December 2000
48.1  October 1965     36.3  November 1996     23.4  December 1960
48.4  October 1972     36.8  November 1967     23.4  December 1876
48.9  October 1917     37.1  November 1910     23.9  December 1976
49.1  October 1978     37.4  November 1951     24.1  December 1962
49.2  October 1952     38.1  November 1995     24.5  December 1917
49.4  October 1981     38.2  November 1936     24.8  December 1935
49.5  October 1980     38.2  November 1871     24.8  December 1972
49.6  October 1909     38.2  November 1875     25.4  December 1983
49.6  October 1876     38.3  November 1950     25.6  December 2010
49.6  October 1957     38.6  November 1980     26.7  December 1969
49.8  October 1895     38.9  November 1955     26.7  December 1880
49.8  October 1888     39.0  November 1997     26.8  December 1945
50.0  October 1907     39.0  November 1959     26.8  December 1909
50.1  October 1992     39.2  November 1901     27.0  December 1910
50.1  October 1937     39.2  November 1969     27.0  December 1878
50.4  October 1873     39.2  November 1947     27.4  December 1985
          

COLDEST TEMPERATURES SO LATE      COLDEST TEMPERATURES SO EARLY
       IN THE SPRING SEASON               IN THE AUTUMN SEASON

    34    Jun 11 1972                   33    Sep 17 1959
    33    May 25 1925                   31    Sep 19 1959       
    30    May 24 1963                   30    Oct  1 1899
    27    May 10 1966                   29    Oct  3 2003
    26    May  7 1970                   27    Oct  6 1965
    24    Apr 27 1971                   26    Oct 12 1964
    22    Apr 22 1875                   25    Oct 16 1876
    19    Apr 19 1983                   20    Oct 20 1972
    14    Apr 18 1875                   16    Oct 29 1965
    11    Apr  1 1923                   15    Nov  4 1991
     9    Mar 25 1974                   11    Nov  5 1991
     6    Mar 22 1886                   10    Nov 14 1986
     5    Mar 21 1885                    9    Nov 16 1933
     2    Mar 18 1877                    8    Nov 18 1959
     1    Mar 17 1900                    7    Nov 21 1880
     0    Mar 11 1960                   -1    Nov 30 1958
    -1    Mar  9 1960                   -7    Dec  3 1976
    -3    Feb 29 1884                  -12    Dec 22 1989
    -9    Feb 27 1963                  -14    Jan 16 1977
    -10   Feb 17 1979                  -18    Jan 17 1982
    -12   Feb 11 1979                  -22    Jan 19 1994
    -20   Feb 10 1899

	FROST INFORMATION

Normals

Average date of last killing frost in spring            April 21
Average date of first killing frost in Autumn         October 20
Average length of growing season                        182 days

Records  

Latest date of killing frost is spring               May 29 1894
Earliest date of killing frost in autumn       September 17 1959
Latest date of killing frost in autumn          November 11 1994

Shortest growing season   131 days      May 29 1894 - Oct 7 1894

Longest growing season    215 days      Apr  1 1901 - Nov 2 1901
                          215 days      Apr  8 1902 - Nov 9 1902


     COLDEST WINTERS                    COLDEST SPRINGS 
(average Dec/Jan/Feb temp)         (average Mar/Apr/May temp)
   20.7    1976-77          1.           45.6    1984
   23.4    1935-36          2.           45.6    1971          
   23.9    1962-63          3.           45.8    1960
   24.0    1978-79          4.           46.5    1940
   24.9    1977-78          5.           46.8    1961
   25.0    1969-70          6.           47.0    1997
   25.3    1917-18          7.           47.2    1874
   26.0    1874-75          8.           47.3    1873
   26.0    1960-61          9.           47.4    1924
   26.2    2002-03         10.           47.6    1956
   26.2    1981-82         11.           47.6    1950
   26.7    1958-59         12.           47.6    1943
   26.8    1980-81         13.           47.8    1947
   26.8    1967-68         14.           47.9    1983
   26.9    1963-64         15.           47.9    1975
   26.9    1919-20         16.           47.9    1937
   27.2    2010-11         17.           47.9    1875
   27.2    1944-45         18.           48.0    2005
   27.2    1939-40         19.           48.0    1980
   27.3    2013-14         20.           48.0    1932              
   27.3    1904-05         21.           48.1    1928
   27.4    1993-94         22.


    COLDEST SUMMERS                    COLDEST AUTUMNS
(average Jun/Jul/Aug temp)         (average Sep/Oct/Nov temp)
     67.0    1976           1.           46.3    1976
     67.9    1977           2.           49.6    1873
     68.1    1985           3.           50.1    1967
     68.1    1982           4.           50.1    1875
     68.2    1927           5.           50.3    1917
     68.3    1965           6.           50.5    1982
     68.5    1972           7.           50.7    1937
     68.6    1963           8.           50.8    1872
     68.8    1992           9.           50.8    1871
     68.8    1960          10.           51.0    1972
     68.9    1961          11.           51.0    1962
     68.9    1958          12.           51.2    1997
     69.1    1964          13.           51.3    1943
     69.2    2004          14.           51.4    1988
     69.2    2000          15.           51.4    1965
     69.2    1979          16.           51.6    1966
     69.3    1997          17.           51.7    1980
     69.4    1915          18.           51.7    1969
     69.4    1907          19.           51.7    1880
     69.6    1956          20.           51.8    1876
     69.6    1946          21.           52.2    1888/1992/2000
     69.7    1984          22.           
     69.8    2009          23.
     69.8    1912          24.

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