Historical Climate Data

Precipitation Summary

Station: 110608 BENTON 2 N, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.90 2.87 4.18 4.50 4.59 4.06 3.19 3.04 2.89 2.94 4.47 3.56 43.19

Precipitation Extremes

Period of Record: 1901-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 12.69 1950 0.00 1919 4.20 01-14-1937
Feb 8.79 1908 0.21 1947 3.80 02-26-1945
Mar 11.36 1945 0.00 1910 5.22 03-25-1913
Apr 13.94 1996 0.51 1915 8.77 04-29-1996
May 12.26 1995 0.47 1914 4.37 05-18-1995
Jun 11.72 1907 0.54 1933 5.95 06-19-2000
Jul 12.45 1909 0.22 1914 4.25 07-20-1988
Aug 15.80 1946 0.08 1936 8.19 08-17-1959
Sep 8.85 1993 0.15 1953 4.57 09-02-1931
Oct 11.26 1919 0.04 1964 4.81 10-17-1967
Nov 12.46 1993 0.50 1965 9.30 11-15-1993
Dec 11.94 1982 0.11 1995 4.70 12-27-1922
             
Annual 65.78 1945 21.31 1963 9.30 11-15-1993
Winter 22.57 1950 2.27 1981 4.70 12-27-1922
Spring 24.44 1945 4.41 1930 8.77 04-29-1996
Summer 20.43 1946 2.25 1930 8.19 08-17-1959
Fall 24.00 1993 2.16 1953 9.30 11-15-1993

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 7.5 5.0 2.0 0.7
Feb 7.3 5.1 2.2 0.7
Mar 9.7 7.2 3.1 1.2
Apr 9.8 7.2 2.7 1.4
May 9.2 7.3 3.4 1.3
Jun 8.2 6.2 2.8 1.0
Jul 6.6 4.9 2.2 1.1
Aug 6.1 4.7 2.0 0.9
Sep 5.4 4.1 2.0 0.9
Oct 6.9 4.8 2.3 0.9
Nov 8.0 6.1 3.1 1.4
Dec 7.3 5.7 2.5 0.9
         
Annual 92.0 68.3 30.2 12.6
Winter 22.2 15.8 6.7 2.3
Spring 28.7 21.7 9.3 3.9
Summer 20.8 15.8 6.9 3.1
Fall 20.3 15.0 7.4 3.3

Temperature Summary

Station 110608 BENTON 2 N, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 39.0 45.1 55.7 66.9 76.4 84.9 89.8 88.5 81.1 69.4 56.0 43.4 66.4
Low °F 21.3 25.8 35.5 44.8 54.3 63.3 67.9 65.3 57.6 45.3 36.7 26.3 45.3
Mean °F 30.2 35.5 45.6 55.9 65.4 74.1 78.9 76.9 69.4 57.4 46.4 34.9 55.9
HDD 1080 827 601 289 108 4 0 1 41 266 561 934 4712
CDD 0 0 0 14 118 278 429 371 172 29 1 0 1412

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

Temperature Extremes

Period of Record: 1902-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 41.7 2006 14.7 1977 78 01-24-1909 -22 01-17-1977
Feb 43.1 1998 22.6 1978 76 02-26-1996 -14 02-13-1905
Mar 58.7 1910 38.0 1996 90 03-23-1910 5 03-04-1978
Apr 62.5 2001 48.8 1907 91 04-27-1989 20 04-07-1990
May 73.3 1902 61.3 1990 95 05-20-1902 30 05-02-1903
Jun 76.6 1909 67.7 1907 103 06-26-1988 42 06-06-1907
Jul 81.2 1903 75.2 1996 103 07-31-1999 54 07-04-1907
Aug 81.3 1995 71.7 2004 103 08-04-1991 48 08-29-1906
Sep 75.2 1908 64.2 2006 100 09-01-1907 34 09-23-1995
Oct 63.1 1902 50.5 1976 96 10-05-1905 21 10-29-1976
Nov 54.2 1902 38.2 1976 84 11-09-1908 8 11-30-1976
Dec 44.2 1907 21.4 1989 92 12-09-1905 -15 12-22-1989
                 
Annual 61.9 1906 52.8 1977 103 06-26-1988 -22 01-17-1977
Winter 40.7 1906 25.4 1978 92 12-09-1905 -22 01-17-1977
Spring 60.4 1977 52.7 1996 95 05-20-1902 5 03-04-1978
Summer 79.0 2002 73.6 1907 103 06-26-1988 42 06-06-1907
Fall 61.7 1902 54.1 2006 100 09-01-1907 8 11-30-1976

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 9.0 24.4 1.8
Feb 0.0 4.0 19.0 0.4
Mar 0.0 0.8 13.3 0.0
Apr 0.1 0.0 2.9 0.0
May 1.0 0.0 0.0 0.0
Jun 8.9 0.0 0.0 0.0
Jul 15.6 0.0 0.0 0.0
Aug 14.6 0.0 0.0 0.0
Sep 5.2 0.0 0.0 0.0
Oct 0.1 0.0 3.2 0.0
Nov 0.0 0.5 12.9 0.0
Dec 0.0 5.6 22.7 0.9
         
Annual 45.0 18.8 96.1 2.9
Winter 0.0 18.5 66.1 3.1
Spring 1.1 0.8 16.3 0.0
Summer 39.0 0.0 0.0 0.0
Fall 5.2 0.5 16.0 0.0

Snowfall Summary

Station: 110608 BENTON 2 N, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 3.4 2.3 0.9 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.4 1.4 8.8

Snowfall Extremes

Period of Record: 1901-2006

Month High (in) Year 1-Day Max (in) Date
Jan 16.0 1978 9.0 01-17-1978
Feb 19.0 1984 8.0 02-25-1965
Mar 19.0 1960 9.0 03-09-1960
Apr 11.0 1971 11.0 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 0.0 - - -
Nov 7.2 1958 7.2 11-28-1958
Dec 17.5 1969 9.0 12-20-1973
Season (Jul-Jun) 39.3 1969-1970 11.0 04-06-1971

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 1.2 0.9 0.4 0.2
Feb 1.2 0.9 0.4 0.2
Mar 0.4 0.3 0.2 0.0
Apr 0.1 0.1 0.0 0.0
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 0.1 0.1 0.1 0.0
Dec 0.3 0.3 0.3 0.1
Annual 3.1 2.4 1.5 0.5

Growing Season Summary

Station: 110608 BENTON 2 N, 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 46 90 237 477 782 1013 1169 1148 854 519 226 57 6380
45 20 45 147 340 629 865 1018 993 705 374 136 24 5114
50 8 19 84 218 477 717 867 838 557 248 74 9 3977
55 3 6 44 122 332 570 716 683 413 147 33 3 2971
60 0 2 18 58 206 424 565 528 278 72 12 0 2096
50** 27 54 142 284 495 685 802 780 558 324 127 31 4157

**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 4/11 3/25 3/27 4/22 4/29 10/20 10/07 10/10 10/24 10/26
30 4/04 3/07 3/19 4/12 4/18 10/26 10/06 10/11 11/03 11/07
28 4/04 3/07 3/13 4/12 4/14 11/03 10/13 10/16 11/17 11/23
24 3/17 2/28 3/04 4/07 4/11 11/17 10/31 11/02 12/09 12/11
20 3/12 2/21 2/22 3/19 4/06 11/29 11/03 11/03 12/26 1/01
16 2/17 12/25 1/08 3/11 3/12 12/13 11/05 11/07 1/01 1/02

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 190 174 176 204 211
30 205 187 191 221 228
28 212 191 203 233 245
24 245 206 218 271 271
20 262 236 243 286 288
16 292 251 258 353 372

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