Historical Climate Data

Precipitation Summary

Station: 119221 WHEATON 3 SE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.85 1.56 2.62 3.80 3.94 3.91 3.97 4.60 3.38 2.66 3.20 2.45 37.94

Precipitation Extremes

Period of Record: 1895-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 6.61 1897 0.12 1981 2.89 01-12-1960
Feb 5.58 1997 0.00 1987 2.85 02-21-1997
Mar 7.28 1948 0.38 1958 3.39 03-19-1948
Apr 9.42 1947 0.41 1899 5.20 04-05-1947
May 8.34 1990 0.04 1992 3.79 05-10-1990
Jun 10.65 1939 0.56 1991 4.05 06-21-1939
Jul 11.95 1996 0.11 1946 9.24 07-18-1996
Aug 15.53 1987 0.55 1953 6.01 08-14-1987
Sep 11.23 1961 0.00 1979 3.35 09-07-1998
Oct 10.87 1954 0.16 1964 5.60 10-10-1954
Nov 7.20 1985 0.40 1999 2.98 11-11-1995
Dec 6.14 1982 0.00 1943 3.04 12-03-1982
             
Annual 47.69 1972 23.30 1956 9.24 07-18-1996
Winter 10.96 1960 1.72 1963 3.04 12-03-1982
Spring 15.52 1991 4.06 1994 5.20 04-05-1947
Summer 22.43 1987 4.21 1991 9.24 07-18-1996
Fall 16.91 1941 2.56 1956 5.60 10-10-1954

Precipitation Threshold Climatology

Derived from 1971-2000 Averages:

*Annual/seasonal totals may differ from the sum of the monthly totals due to rounding.


Month 		# Days
Total ≥ 0.01" 		# Days
Total ≥ 0.10" 		# Days
Total ≥ 0.50" 		# Days
Total ≥ 1.00"
Jan 9.4 4.7 1.0 0.3
Feb 7.8 4.1 0.8 0.2
Mar 9.4 5.9 1.4 0.4
Apr 10.7 7.0 2.5 1.1
May 10.4 7.4 2.8 1.0
Jun 9.8 6.8 2.9 1.0
Jul 9.0 6.3 2.5 1.0
Aug 9.4 6.6 3.0 1.3
Sep 7.6 5.4 2.1 0.8
Oct 7.9 4.9 1.8 0.6
Nov 9.3 5.9 2.1 0.7
Dec 9.6 5.0 1.4 0.5
         
Annual 110.4 70.2 24.2 9.0
Winter 26.8 13.8 3.1 1.0
Spring 30.5 20.3 6.6 2.5
Summer 28.2 19.7 8.4 3.3
Fall 24.9 16.3 6.0 2.1

Temperature Summary

Station 119221 WHEATON 3 SE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 32.0 38.0 50.0 62.8 74.8 83.8 86.8 85.0 78.4 66.5 50.0 36.9 62.1
Low °F 14.2 18.9 28.4 37.6 47.6 57.4 62.8 61.5 53.4 42.1 31.7 20.5 39.7
Mean °F 23.1 28.5 39.2 50.2 61.2 70.6 74.8 73.3 65.9 54.3 40.9 28.7 50.9
HDD 1298 1023 800 447 191 22 2 13 65 343 724 1125 6053
CDD 0 0 0 3 72 191 306 267 91 12 0 0 942

HDD - heating degree days (base 65F); CDD - cooling degree days (base 65F)

Temperature Extremes

Period of Record: 1895-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 36.8 2006 9.2 1977 65 01-31-1989 -26 01-20-1985
Feb 40.2 1998 16.4 1978 74 02-25-2000 -21 02-06-1977
Mar 47.0 2000 24.4 1960 85 03-29-1986 -10 03-01-1962
Apr 56.0 1955 43.7 1975 90 04-22-1980 4 04-07-1982
May 67.4 1977 55.2 1967 95 05-26-1967 25 05-10-1966
Jun 74.7 1991 64.0 1958 103 06-25-1988 32 06-11-1972
Jul 79.8 1999 69.9 1962 105 07-14-1995 41 07-06-1967
Aug 80.0 1995 67.4 1967 100 08-02-1991 38 08-18-1963
Sep 70.2 1998 60.9 1975 100 09-01-1953 27 09-23-1974
Oct 62.5 1963 47.4 1988 90 10-06-1963 14 10-30-1988
Nov 49.9 2001 31.4 1976 78 11-01-1950 -4 11-24-1950
Dec 36.7 1982 16.0 1963 70 12-05-2001 -21 12-24-1983
                 
Annual 54.9 1998 47.1 1979 105 07-14-1995 -26 01-20-1985
Winter 34.7 2002 17.7 1963 74 02-25-1900 -26 01-20-1985
Spring 55.6 1977 45.2 1960 95 05-26-1967 -10 03-01-1962
Summer 76.7 1995 69.2 1992 105 07-14-1995 32 06-11-1972
Fall 57.3 1998 47.4 1976 100 09-01-1953 -4 11-24-1950

Temperature Threshold Climatology

Derived from 1971-2000 Averages:

*Annual/seasonal values may differ from the sum of the monthly values due to rounding.


Month 		# Days
High ≥ 90°F 		# Days
High ≤ 32°F 		# Days
Low ≤ 32°F 		# Days
Low ≤ 0°F
Jan 0.0 15.8 28.7 6.2
Feb 0.0 9.5 24.3 3.6
Mar 0.0 2.1 21.2 0.2
Apr 0.1 0.0 9.3 0.0
May 1.5 0.0 1.5 0.0
Jun 6.9 0.0 0.0 0.0
Jul 9.7 0.0 0.0 0.0
Aug 6.9 0.0 0.0 0.0
Sep 2.3 0.0 0.4 0.0
Oct 0.0 0.0 6.0 0.0
Nov 0.0 1.4 17.2 0.1
Dec 0.0 9.5 26.6 2.7
         
Annual 27.6 38.3 135.7 12.8
Winter 0.0 34.9 79.7 12.6
Spring 1.6 2.1 32.4 0.2
Summer 23.5 0.0 0.0 0.0
Fall 2.4 1.4 23.8 0.1

Snowfall Summary

Station: 119221 WHEATON 3 SE, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 11.0 7.7 4.5 1.1 0.0 0.0 0.0 0.0 0.0 0.0 1.9 7.3 33.5

Snowfall Extremes

Period of Record: 1895-2006

Month High (in) Year 1-Day Max (in) Date
Jan 41.1 1979 12.1 01-02-1999
Feb 20.3 1994 10.0 02-15-1990
Mar 16.8 1972 10.0 03-26-1970
Apr 11.2 1975 11.2 04-02-1975
May 2.0 1966 2.0 05-11-1966
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 5.5 1967 5.5 10-27-1967
Nov 11.8 1950 10.3 11-27-1975
Dec 40.5 1951 10.8 12-23-1961
Season (Jul-Jun) 65.1 1951-1952 12.1 01-02-1999

Snowfall Threshold Climatology

Derived from 1971-2000 Averages

*Annual values may differ from the sum of the monthly values due to rounding.


Month 		# Days
Total ≥ 0.1" 		# Days
Total ≥ 1.0" 		# Days
Total ≥ 2.0" 		# Days
Total ≥ 5.0"
Jan 4.6 2.5 1.7 0.3
Feb 4.6 2.5 1.7 0.3
Mar 2.5 1.5 0.8 0.2
Apr 0.3 0.3 0.2 0.1
May 0.0 0.0 0.0 0.0
Jun 0.0 0.0 0.0 0.0
Jul 0.0 0.0 0.0 0.0
Aug 0.0 0.0 0.0 0.0
Sep 0.0 0.0 0.0 0.0
Oct 0.0 0.0 0.0 0.0
Nov 1.3 0.8 0.3 0.1
Dec 4.8 2.6 1.4 0.3
Annual 20.0 11.2 6.4 1.5

Growing Season Summary

Station: 119221 WHEATON 3 SE, IL

Growing Degree Day Averages

Derived from 1971-2000 Data

Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
40 6 22 117 316 645 906 1069 1024 763 432 130 21 5371
45 1 7 64 200 493 758 916 870 615 295 69 9 4237
50 0 2 33 112 348 610 762 716 468 181 33 3 3225
55 0 0 14 56 221 462 609 562 328 98 12 1 2335
60 0 0 5 25 123 320 455 409 205 43 3 0 1571
50** 3 14 79 206 414 597 723 691 494 271 72 11 3524

**Modified Growing Degree Days: Base 50, Ceiling 86.

Growing Season Summary

Derived from 1971-2000 Averages

Date of Last Spring Occurrence Date of First Fall Occurrence
Temp °F Median Early 90% 10% Late Median Early 90% 10% Late
32 5/06 4/09 4/20 5/26 6/12 10/10 9/22 9/24 10/20 11/01
30 5/03 4/09 4/14 5/13 5/27 10/12 9/23 9/27 10/26 11/01
28 4/23 3/29 4/05 5/08 5/12 10/21 9/23 10/07 11/05 11/20
24 4/10 3/27 4/04 4/21 4/27 11/04 10/14 10/21 11/17 11/22
20 3/27 3/12 3/16 4/12 4/19 11/12 10/20 10/30 11/30 12/11
16 3/18 2/22 3/04 4/08 4/10 11/22 10/31 11/07 12/11 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 156 119 135 177 182
30 165 136 143 181 188
28 182 139 163 210 225
24 208 176 195 221 229
20 225 199 209 250 260
16 248 217 219 276 282

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Copyright 2007 Illinois State Water Survey
Jim Angel, State Climatologist, jimangel@illinois.edu
Last Modified: September 11, 2007