May 1999 Climate Data for Pittsburgh, PA  
See Key below for explanation of abbreviations
DATE  TEMPS   |DP|HEATING DD|COOLING DD|PRECIPITATION
   HI LO AV NR|DY|DY MON SEA|DY MON SEA| DAY  MON NORM  DEP  YEAR  NORM   DEP
01*72 41 57 55 +2  8   8 5122 0   0   0    0    0  .11 -.11 12.74 11.60 +1.14
02*75 43 59 55 +4  6  14 5128 0   0   0    0    0  .22 -.22 12.74 11.71 +1.03
03*74 42 58 55 +3  7  21 5135 0   0   0    0    0  .33 -.33 12.74 11.82  +.92
04*78 46 62 56 +6  3  24 5138 0   0   0    0    0  .44 -.44 12.74 11.93  +.81
05*77 50 64 56 +8  1  25 5139 0   0   0    T    T  .55 -.55 12.74 12.04  +.70
06*83 56 70 57+13  0  25 5139 5   5   5    0    T  .66 -.66 12.74 12.15  +.59
07*77 53 65 57 +8  0  25 5139 0   5   5    T    T  .77 -.77 12.74 12.26  +.48
08*70 53 62 57 +5  3  28 5142 0   5   5  .39  .39  .88 -.49 13.13 12.37  +.76
09*65 48 57 57  0  8  36 5150 0   5   5    T  .39  .99 -.60 13.13 12.48  +.65
10*73 41 57 58 -1  8  44 5158 0   5   5    0  .39 1.10 -.71 13.13 12.59  +.54
11*81 48 65 58 +7  0  44 5158 0   5   5    0  .39 1.21 -.82 13.13 12.70  +.43
12*82 49 66 58 +8  0  44 5158 1   6   6    T  .39 1.32 -.93 13.13 12.81  +.32
13*62 49 56 59 -3  9  53 5167 0   6   6  .73 1.12 1.43 -.31 13.86 12.92  +.94
14*65 50 58 59 -1  7  60 5174 0   6   6  .02 1.14 1.55 -.41 13.88 13.04  +.84
15*73 45 59 59  0  6  66 5180 0   6   6    0 1.14 1.67 -.53 13.88 13.16  +.72
16*75 50 63 60 +3  2  68 5182 0   6   6    0 1.14 1.79 -.65 13.88 13.28  +.60
.............................................................................
                                      PITTSBURGH AIRPORT MAY 99
      MAY 99  (NORMALS 1961-90 RV)
DATE  TEMPS   |DP|HEATING DD|COOLING DD|PRECIPITATION
   HI LO AV NR|DY|DY MON SEA|DY MON SEA| DAY  MON NORM  DEP  YEAR  NORM   DEP
17*81 53 67 60 +7  0  68 5182 2   8   8    0 1.14 1.91 -.77 13.88 13.40  +.48
18*81 56 69 60 +9  0  68 5182 4  12  12 1.44 2.58 2.03 +.55 15.32 13.52 +1.80
19*67 50 59 60 -1  6  74 5188 0  12  12  .02 2.60 2.15 +.45 15.34 13.64 +1.70
20*70 42 56 61 -5  9  83 5197 0  12  12    0 2.60 2.27 +.33 15.34 13.76 +1.58
21*75 43 59 61 -2  6  89 5203 0  12  12    0 2.60 2.39 +.21 15.34 13.88 +1.46
22*69 54 62 61 +1  3  92 5206 0  12  12  .64 3.24 2.51 +.73 15.98 14.00 +1.98
23*64 58 61 62 -1  4  96 5210 0  12  12    T 3.24 2.63 +.61 15.98 14.12 +1.86
24*61 47 54 62 -8 11 107 5221 0  12  12  .87 4.11 2.75+1.36 16.85 14.24 +2.61
25*61 44 53 62 -9 12 119 5233 0  12  12  .01 4.12 2.87+1.25 16.86 14.36 +2.50
26*58 48 53 63-10 12 131 5245 0  12  12    T 4.12 2.99+1.13 16.86 14.48 +2.38
27*71 42 57 63 -6  8 139 5253 0  12  12    0 4.12 3.11+1.01 16.86 14.60 +2.26
28*78 50 64 63 +1  1 140 5254 0  12  12    0 4.12 3.23 +.89 16.86 14.72 +2.14
29*83 50 67 63 +4  0 140 5254 2  14  14    0 4.12 3.35 +.77 16.86 14.84 +2.02
30*84 54 69 64 +5  0 140 5254 4  18  18    0 4.12 3.47 +.65 16.86 14.96 +1.90
31*84 57 71 64 +7  0 140 5254 6  24  24    0 4.12 3.59 +.53 16.86 15.08 +1.78

                    ...MAY 1999...
TEMPERATURES
AVERAGE MAXIMUM................................ 73.2 DEGREES
AVERAGE MINIMUM................................ 48.8 DEGREES
AVERAGE FOR MONTH.............................. 61.0 DEGREES
DEPARTURE FROM NORMAL.......................... +1.5 DEGREES
HIGHEST AND DATE............ 84 DEGREES ON THE 30TH AND 31ST
LOWEST AND DATE.............  41 DEGREES ON THE 1ST AND 10TH
NUMBER OF DAYS MAX TEMPERATURE 32 DEGREES OR BELOW.......  0
NUMBER OF DAYS MAX TEMPERATURE 90 DEGREES OR ABOVE.......  0
NUMBER OF DAYS MIN TEMPERATURE 32 DEGREES OR BELOW.......  0
 
HEATING DEGREE DAYS..................................... 140
DEPARTURE FROM NORMAL................................... -74
SEASONAL TOTAL HEATING..................................5254
COOLING DEGREE DAYS.....................................  24
DEPARTURE FROM NORMAL................................... -20
SEASONAL TOTAL COOLING....................................24
 
PRECIPITATION DATA
TOTAL FOR THE MONTH...................................  4.12
DEPARTURE FROM NORMAL................................. +0.53
TOTAL FOR THE YEAR.................................... 16.86
DEPARTURE FROM NORMAL................................. +1.78
MAXIMUM PRECIPITATION IN 24 HOURS..... 1.46 INCHES 18TH-19TH
 
NUMBER OF DAYS WITH PRECIPITATION 0.01 INCHES OR MORE....  8
NUMBER OF DAYS WITH PRECIPITATION 0.10 INCHES OR MORE....  5
NUMBER OF DAYS WITH PRECIPITATION 0.50 INCHES OR MORE....  4
NUMBER OF DAYS WITH PRECIPITATION 1.00 INCHES OR MORE....  1
 
SUNSHINE
NUMBER OF DAYS WITH CLEAR SKIES.......................... 12
NUMBER OF DAYS WITH PARTLY CLOUDY SKIES..................  9
NUMBER OF DAYS WITH CLOUDY SKIES......................... 10
HIGHEST SEA LEVEL PRESSURE........ 30.29 ON THE 20TH AT 0908
LOWEST SEA LEVEL PRESSURE......... 29.49 ON THE 24TH AT 0609
 
...HIGHLIGHTS...
RECORD RAINFALL FOR THE 14TH OF 1.44 INCHES.  JUST 8 DAYS WITH MEASURABLE
RAINFALL THIS MONTH.

Key 

HI = High for Day
LO = Low for Day
AV = Average
NR = Normal Average
DP DY = Daily Departure for Normal
HEATING DD = Heating Degree Day for
-----DY = Day
-----MON = Month
-----SEAS = Season
SNOWFALL for DAY...Month and Season
PRECIPITATION for
-----DY = DAY
-----MON = Month
-----NORM = Cumulative Normal for Month
-----DEP = Cumulitive Departure for Normal for Month
-----YEAR = Cumulitive Yearly Total
-----NORM = Cumulative Yearly Normal
-----DEP = Depature from the Yearly Normal