April 1999 Climate Data for Pittsburgh, PA  
See Key below for explanation of abbreviations
APRIL 1999        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*60 49 55 45+10 10  10 4737   0   0 39.2  .09  .09  .11 -.02  8.64  8.45 +.19
02*69 53 61 45+16 04  14 4741   0   0 39.2    0  .09  .22 -.13  8.64  8.56 +.08
03*78 46 62 46+16 03  17 4744   0   0 39.2  .09  .18  .33 -.15  8.73  8.67 +.06
04*66 48 57 46+11 08  25 4752   0   0 39.2  .44  .62  .44 +.18  9.17  8.78 +.39
05*59 40 50 46 +4 15  40 4767   0   0 39.2    0  .62  .55 +.07  9.17  8.89 +.28
06*77 44 61 47+14 04  44 4771   0   0 39.2  .10  .72  .66 +.06  9.27  9.00 +.27
07*66 44 55 47 +8 10  54 4781   0   0 39.2    0  .72  .77 -.05  9.27  9.11 +.16
08*76 51 64 47+17 01  55 4782   0   0 39.2    T  .72  .88 -.16  9.27  9.22 +.05
09*67 42 55 48 +7 10  65 4792   0   0 39.2 1.31 2.03  .99+1.04 10.58  9.33+1.25
10*57 38 48 48  0 17  82 4809   0   0 39.2    0 2.03 1.09 +.94 10.58  9.43+1.15
11*70 43 57 48 +9 08  90 4817   0   0 39.2  .26 2.29 1.19+1.10 10.84  9.53+1.31
12*53 37 45 48 -3 20 110 4837   T   T 39.2  .02 2.31 1.29+1.02 10.86  9.63+1.23
13*57 30 44 49 -5 21 131 4858   0   T 39.2    0 2.31 1.39 +.92 10.86  9.73+1.13
14*64 32 48 49 -1 17 148 4875   0   T 39.2    0 2.31 1.49 +.82 10.86  9.83+1.03
15*55 38 47 49 -2 18 166 4893   0   T 39.2  .49 2.80 1.59+1.21 11.35  9.93+1.42
16*50 37 44 50 -6 21 187 4914   T   T 39.2  .09 2.89 1.69+1.20 11.44 10.03+1.41
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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
17*42 38 40 50-10 25 212 4939   0   T 39.2  .13 3.02 1.79+1.23 11.57 10.13+1.44
18*51 40 46 50 -4 19 231 4958   0   T 39.2  .01 3.03 1.89+1.14 11.58 10.23+1.35
19*52 39 46 51 -5 19 250 4977   0   T 39.2  .11 3.14 1.99+1.15 11.69 10.33+1.36
20*51 38 45 51 -6 20 270 4997   0   T 39.2  .21 3.35 2.09+1.26 11.90 10.43+1.47
21*57 37 47 51 -4 18 288 5015   0   T 39.2  .37 3.72 2.19+1.53 12.27 10.53+1.74
22*81 48 65 52+13  0 288 5015   0   T 39.2    0 3.72 2.29+1.43 12.27 10.63+1.64
23*67 39 53 52 +1 12 300 5027   0   T 39.2  .47 4.19 2.39+1.80 12.74 10.73+2.01
24*57 31 44 52 -8 21 321 5048   0   T 39.2    0 4.19 2.49+1.70 12.74 10.83+1.91
25*61 30 46 53 -7 19 340 5067   0   T 39.2    0 4.19 2.60+1.59 12.74 10.94+1.80
26*70 34 52 53 -1 13 353 5080   0   T 39.2    0 4.19 2.71+1.48 12.74 11.05+1.69
27*66 43 55 53 +2 10 363 5090   0   T 39.2    0 4.19 2.82+1.37 12.74 11.16+1.58
28*67 48 58 54 +4  7 370 5097   0   T 39.2    0 4.19 2.93+1.26 12.74 11.27+1.47
29*66 44 55 54 +1 10 380 5107   0   T 39.2    0 4.19 3.04+1.15 12.74 11.38+1.36
30*70 45 58 54 +4  7 387 5114   0   T 39.2    0 4.19 3.15+1.04 12.74 11.49+1.25

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