April 1998 Climate Data for Pittsburgh, PA  
See Key below for explanation of abbreviations
APRIL 1998        PITTSBURGH INTL AIRPORT              NORMALS 1961-90 RV
   TEMPERATURE|DP|HEATING DD |SNOWFALL    |PRECIPITATION
   HI LO AV NR|DY|DY MON SEAS|DAY MON SEAS| DAY  MON NORM  DEP  YEAR  NORM  DEP
01*72 50 61 45+16  4   4 4591   0   0 24.2  .24  .24  .11 +.13  8.34  8.45 -.11
02*53 42 48 45 +3 17  21 4608   0   0 24.2    0  .24  .22 +.02  8.34  8.56 -.22
03*54 34 44 46 -2 21  42 4629   0   0 24.2    0  .24  .33 -.09  8.34  8.67 -.33
04*49 39 44 46 -2 21  63 4650   0   0 24.2    0  .24  .44 -.20  8.34  8.78 -.44
05*55 36 46 46  0 19  82 4669   0   0 24.2    0  .24  .55 -.31  8.34  8.89 -.55
06*57 27 42 47 -5 23 105 4692   0   0 24.2    0  .24  .66 -.42  8.34  9.00 -.66
07*64 29 47 47  0 18 123 4710   0   0 24.2  .01  .25  .77 -.52  8.35  9.11 -.76
08*69 47 58 47+11  7 130 4717   0   0 24.2  .49  .74  .88 -.14  8.84  9.22 -.38
09*64 43 54 48 +6 11 141 4728   0   0 24.2  .56 1.30  .99 +.31  9.40  9.33 +.07
10*55 38 47 48 -1 18 159 4746   0   0 24.2  .06 1.36 1.09 +.27  9.46  9.43 +.03
11*57 29 43 48 -5 22 181 4768   0   0 24.2    T 1.36 1.19 +.17  9.46  9.53 -.07
12*64 32 48 48  0 17 198 4785   0   0 24.2    0 1.36 1.29 +.07  9.46  9.63 -.17
13*72 39 56 49 +7  9 207 4794   0   0 24.2    0 1.36 1.39 -.03  9.46  9.73 -.27
14*65 53 59 49+10  6 213 4800   0   0 24.2  .13 1.49 1.49    0  9.59  9.83 -.24
15*64 46 55 49 +6 10 223 4810   0   0 24.2    0 1.49 1.59 -.10  9.59  9.93 -.34
16*68 53 61 50+11  4 227 4814   0   0 24.2  .60 2.09 1.69 +.40 10.19 10.03 +.16
..........
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   TEMPERATURE|DP|HEATING DD |SNOWFALL    |PRECIPITATION
   HI LO AV NR|DY|DY MON SEAS|DAY MON SEAS| DAY  MON NORM  DEP  YEAR  NORM  DEP
17*65 43 54 50 +4 11 238 4825   0   0 24.2    T 2.09 1.79 +.30 10.19 10.13 +.06
18*57 34 46 50 -4 19 257 4844   0   0 24.2  .01 2.10 1.89 +.21 10.20 10.23 -.03
19*51 42 47 51 -4 18 275 4862   0   0 24.2 1.15 3.25 1.99+1.26 11.35 10.33+1.02
20*60 40 50 51 -1 15 290 4877   0   0 24.2  .01 3.26 2.09+1.17 11.36 10.43 +.93
21*65 35 50 51 -1 15 305 4892   0   0 24.2    0 3.26 2.19+1.07 11.36 10.53 +.83
22*65 47 56 52 +4  9 314 4901   0   0 24.2    T 3.26 2.29+0.97 11.36 10.63 +.73
23*66 46 56 52 +4  9 323 4910   0   0 24.2    0 3.26 2.39+0.87 11.36 10.73 +.63
24*71 40 56 52 +4  9 332 4919   0   0 24.2  .01 3.27 2.49+0.78 11.37 10.83 +.54
25*66 40 53 53  0 12 344 4931   0   0 24.2  .01 3.28 2.60+0.68 11.38 10.94 +.44
26*56 41 49 53 -4 16 360 4947   0   0 24.2 1.50 4.78 2.71+2.07 12.88 11.05+1.83
27*55 35 45 53 -8 20 380 4967   0   0 24.2    0 4.78 2.82+1.96 12.88 11.16+1.72
28*63 32 48 54 -6 17 397 4984   0   0 24.2    0 4.78 2.93+1.85 12.88 11.27+1.61
29*68 37 53 54 -1 12 409 4996   0   0 24.2    T 4.78 3.04+1.74 12.88 11.38+1.50
30*63 55 59 54 +5  6 415 5002   0   0 24.2  .22 5.00 3.15+1.85 13.10 11.49+1.61
 

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