PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) STATION: CHICAGO-OHARE MONTH: APRIL YEAR: 2002 LATITUDE: 41 58 N LONGITUDE: 87 54 W TEMPERATURE IN F: :PCPN: SNOW: WIND :SUNSHINE: SKY :PK WND ================================================================================ 1 2 3 4 5 6A 6B 7 8 9 10 11 12 13 14 15 16 17 18 AVG MX 2MIN DY MAX MIN AVG DEP HDD CDD WTR SNW DPTH SPD SPD DIR MIN PSBL S-S WX SPD DR ================================================================================ 1 41 27 34 -9 31 0 0.22 0.9 0 6.0 15 70 M M 6 14 20 60 2 44 33 39 -4 26 0 0.02 T 0 12.7 24 310 M M 10 18 29 290 3 40 30 35 -8 30 0 0.01 T 0 8.6 20 310 M M 9 1 21 300 4 37 25 31 -12 34 0 0.02 0.1 0 5.9 15 340 M M 9 1 22 330 5 41 24 33 -11 32 0 T T 0 6.4 18 310 M M 7 18 22 80 6 44 24 34 -10 31 0 0.00 0.0 0 7.4 17 140 M M 4 1 22 100 7 49 35 42 -3 23 0 0.30 0.0 0 11.9 21 180 M M 9 18 26 180 8 52 46 49 4 16 0 0.88 0.0 0 7.1 15 360 M M 10 128 26 20 9 51 35 43 -2 22 0 0.05 0.0 0 7.5 17 360 M M 6 18 24 60 10 64 34 49 3 16 0 0.00 0.0 0 10.7 21 170 M M 3 18 24 170 11 75 50 63 17 2 0 0.00 0.0 0 13.0 23 180 M M 7 29 170 12 67 47 57 11 8 0 T 0.0 0 8.7 20 220 M M 9 18 28 230 13 62 42 52 5 13 0 0.00 0.0 0 5.7 12 80 M M 6 1 24 60 14 77 41 59 12 6 0 0.00 0.0 0 10.2 22 190 M M 5 18 26 190 15 88 62 75 28 0 10 0.00 0.0 0 13.7 23 210 M M 5 31 210 16 87 68 78 30 0 13 0.00 0.0 0 17.3 29 190 M M 4 37 210 17 85 65 75 27 0 10 0.07 0.0 0 10.2 20 220 M M 5 1 25 230 18 89 63 76 27 0 11 0.04 0.0 0 14.2 32 300 M M 5 3 39 210 19 68 44 56 7 9 0 0.19 0.0 0 13.6 23 40 M M 8 3 28 20 20 48 41 45 -4 20 0 0.04 0.0 0 17.7 25 30 M M 8 31 30 21 42 39 41 -9 24 0 0.35 0.0 0 14.3 26 100 M M 10 1 33 90 22 43 36 40 -11 25 0 T 0.0 0 8.3 16 320 M M 10 1 22 50 23 60 31 46 -5 19 0 0.00 0.0 0 8.3 17 120 M M 3 1 20 130 24 73 42 58 7 7 0 0.29 0.0 0 16.2 36 280 M M 4 13 46 270 25 54 37 46 -6 19 0 0.00 0.0 0 15.4 32 260 M M 2 41 290 26 53 36 45 -7 20 0 0.00 0.0 0 6.9 15 100 M M 2 22 90 27 54 41 48 -4 17 0 0.51 M 0 13.7 28 120 M M 10 13 33 110 28 59 41 50 -3 15 0 0.01 M 0 15.6 31 250 M M 10 1 39 240 29 61 40 51 -2 14 0 0.00 0.0 0 9.3 20 280 M M 6 8 26 270 30 60 47 54 1 11 0 T 0.0 0 6.3 15 340 M M 8 20 360 ================================================================================ SM 1768 1226 490 44 3.00 1.0 322.8 M 202 ================================================================================ AV 58.9 40.9 10.8 FASTST PSBL % 7 MAX(MPH) MISC ----> 36 280 46 270 ================================================================================ NOTES: # LAST OF SEVERAL OCCURRENCES COLUMN 17 PEAK WIND IN M.P.H. PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2 STATION: CHICAGO-OHARE MONTH: APRIL YEAR: 2002 LATITUDE: 41 58 N LONGITUDE: 87 54 W [TEMPERATURE DATA] [PRECIPITATION DATA] SYMBOLS USED IN COLUMN 16 AVERAGE MONTHLY: 49.9 TOTAL FOR MONTH: 3.00 1 = FOG DPTR FM NORMAL: 2.1 DPTR FM NORMAL: -0.68 2 = FOG REDUCING VISIBILITY HIGHEST: 89 ON 18 GRTST 24HR 0.93 ON 8- 9 TO 1/4 MILE OR LESS LOWEST: 24 ON 5, 6 3 = THUNDER SNOW, ICE PELLETS, HAIL 4 = ICE PELLETS TOTAL MONTH: 1.0 INCH 5 = HAIL GRTST 24HR 0.9 ON 1 6 = GLAZE OR RIME 7 = BLOWING DUST OR SAND: VSBY 1/2 MILE OR LESS 8 = SMOKE OR HAZE [NO. OF DAYS WITH] [WEATHER - DAYS WITH] 9 = BLOWING SNOW X = TORNADO MAX 32 OR BELOW: 0 0.01 INCH OR MORE: 15 MAX 90 OR ABOVE: 0 0.10 INCH OR MORE: 7 MIN 32 OR BELOW: 6 0.50 INCH OR MORE: 2 MIN 0 OR BELOW: 0 1.00 INCH OR MORE: 0 [HDD (BASE 65) ] TOTAL THIS MO. 490 CLEAR (SCALE 0-3) 3 DPTR FM NORMAL -2 PTCLDY (SCALE 4-7) 14 SEASONAL TOTAL 5350 CLOUDY (SCALE 8-10) 13 DPTR FM NORMAL -916 [CDD (BASE 65) ] TOTAL THIS MO. 44 DPTR FM NORMAL 35 [PRESSURE DATA] SEASONAL TOTAL 44 HIGHEST SLP 30.48 ON 6 DPTR FM NORMAL 34 LOWEST SLP 29.36 ON 28