Historical Climate Data

Precipitation Summary

Station: 116200 NORMAL 4NE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.73 1.71 2.87 3.83 4.52 3.88 3.95 3.83 2.95 2.71 3.06 2.41 37.45

Precipitation Extremes

Period of Record: 1977-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 6.82 2005 0.12 1986 2.34 01-04-1993
Feb 5.13 1990 0.28 1987 2.27 02-23-1985
Mar 5.01 2004 0.72 1981 1.65 03-05-2004
Apr 6.71 1979 1.31 1986 3.15 04-17-2006
May 7.99 2004 0.55 1992 3.21 05-20-1984
Jun 10.11 1993 0.31 1988 3.50 06-02-1980
Jul 13.74 1992 0.52 1988 5.63 07-10-2003
Aug 9.93 1977 0.47 1996 4.83 08-06-1977
Sep 10.99 1993 0.15 1979 5.21 09-20-1986
Oct 7.35 1991 0.83 2005 3.53 10-03-1986
Nov 9.33 1985 0.40 1999 1.94 11-01-1994
Dec 6.61 1990 0.70 1995 2.64 12-29-1990
             
Annual 63.35 1993 23.21 1988 5.63 07-10-2003
Winter 10.19 1993 2.77 1980 2.64 12-29-1990
Spring 16.13 1984 4.90 1992 3.21 05-20-1984
Summer 24.95 1981 3.82 1988 5.63 07-10-2003
Fall 18.66 1993 3.53 1999 5.21 09-20-1986

Precipitation Threshold Climatology

Derived from 1977-2000 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 4.5 0.8 0.2
Feb 8.3 4.2 1.0 0.2
Mar 11.0 6.0 1.8 0.4
Apr 12.1 7.4 2.6 0.7
May 11.9 7.9 3.3 1.1
Jun 10.0 6.1 2.7 1.2
Jul 9.3 5.9 2.8 1.3
Aug 9.7 6.2 2.7 1.2
Sep 8.5 5.0 1.8 0.7
Oct 9.7 6.0 1.9 0.5
Nov 10.7 6.1 2.3 0.9
Dec 10.1 5.7 1.4 0.3
         
Annual 120.6 71.1 25.2 8.6
Winter 27.9 14.4 3.3 0.7
Spring 35.0 21.3 7.7 2.2
Summer 28.9 18.2 8.1 3.6
Fall 28.9 17.1 6.0 2.1

Temperature Summary

Station 116200 NORMAL 4NE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 31.0 36.4 48.4 61.2 72.8 82.6 85.6 83.6 77.2 65.1 48.8 36.3 60.8
Low °F 13.7 18.2 28.8 39.7 50.8 60.9 64.7 62.8 54.0 42.3 30.8 19.9 40.6
Mean °F 22.4 27.3 38.6 50.5 61.8 71.8 75.2 73.2 65.6 53.7 39.8 28.1 50.7
HDD 1322 1056 817 443 182 15 1 15 76 362 757 1144 6190
CDD 0 0 0 6 82 218 316 269 95 12 0 0 998

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

Temperature Extremes

Period of Record: 1977-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 36.8 1990 13.1 1979 66 01-31-1989 -23 01-20-1985
Feb 38.9 1998 16.5 1978 71 02-27-1996 -20 02-06-1982
Mar 45.2 1985 31.4 1984 85 03-29-1986 -6 03-04-1978
Apr 58.7 1986 45.9 1996 91 04-25-1986 10 04-07-1982
May 70.0 1987 56.8 1997 93 05-26-1985 26 05-07-1989
Jun 76.3 1984 68.2 1982 103 06-25-1988 35 06-02-1993
Jul 80.9 1983 71.6 1992 102 07-25-2005 48 07-02-2005
Aug 80.3 1983 67.1 1992 103 08-16-1988 41 08-28-1986
Sep 72.4 1978 59.6 1993 96 09-09-1983 31 09-30-1984
Oct 59.8 1984 49.5 1988 90 10-05-2005 18 10-24-1981
Nov 49.8 2001 33.3 1996 80 11-01-2000 1 11-26-1977
Dec 38.5 1982 16.8 1983 71 12-05-1998 -22 12-22-1989
                 
Annual 55.0 1987 48.7 1993 103 06-25-1988 -23 01-20-1985
Winter 34.4 1983 19.2 1978 71 12-05-1998 -23 01-20-1985
Spring 56.7 1985 46.1 1996 93 05-26-1985 -6 03-04-1978
Summer 78.3 1983 69.1 1992 103 06-25-1988 35 06-02-1993
Fall 57.2 1983 49.0 1993 96 09-09-1983 1 11-26-1977

Temperature Threshold Climatology

Derived from 1977-2000 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 15.5 28.3 5.0
Feb 0.0 10.0 24.0 3.0
Mar 0.0 3.1 19.7 0.1
Apr 0.1 0.1 6.5 0.0
May 1.0 0.0 0.4 0.0
Jun 6.7 0.0 0.0 0.0
Jul 9.4 0.0 0.0 0.0
Aug 6.5 0.0 0.0 0.0
Sep 2.7 0.0 0.3 0.0
Oct 0.0 0.0 5.1 0.0
Nov 0.0 1.8 16.2 0.0
Dec 0.0 9.3 27.0 2.5
         
Annual 26.7 39.6 127.2 10.5
Winter 0.0 34.7 79.3 10.5
Spring 1.2 3.2 26.6 0.1
Summer 22.6 0.0 0.0 0.0
Fall 2.7 1.8 21.9 0.0

Snowfall Summary

Station: 116200 NORMAL 4NE, IL

1977-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 7.7 5.4 2.0 0.8 0.0 0.0 0.0 0.0 0.0 0.1 0.7 5.2 21.9

Snowfall Extremes

Period of Record: 1977-2006

Month High (in) Year 1-Day Max (in) Date
Jan 24.6 1979 12.0 01-02-1999
Feb 15.0 1986 6.0 02-26-1993
Mar 8.2 1978 6.0 03-09-1999
Apr 11.3 1982 4.0 04-11-1997
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 1.5 1989 1.5 10-20-1989
Nov 6.0 2004 6.0 11-25-2004
Dec 18.1 2000 4.8 12-14-2000
Season (Jul-Jun) 48.0 1981-1982 12.0 01-02-1999

Snowfall Threshold Climatology

Derived from 1977-2000 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 4.0 2.2 1.0 0.2
Feb 4.0 2.2 1.0 0.2
Mar 2.0 0.9 0.2 0.0
Apr 0.4 0.3 0.2 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 0.9 0.2 0.1 0.0
Dec 3.8 2.0 1.2 0.0
Annual 16.3 8.4 4.1 0.4

Growing Season Summary

Station: 116200 NORMAL 4NE, 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 13 30 136 359 713 979 1119 1055 812 460 150 28 5819
45 4 11 77 237 558 829 964 900 663 321 85 12 4633
50 0 3 41 140 408 679 809 745 516 202 42 5 3570
55 0 0 20 73 272 529 654 590 375 114 16 2 2632
60 0 0 8 33 159 383 499 436 246 53 4 0 1813
50** 7 19 88 216 448 657 768 719 528 282 85 15 3811

**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 4/22 3/29 4/06 5/13 5/28 10/11 9/20 9/29 10/27 11/03
30 4/13 3/26 3/31 5/01 5/12 10/18 10/03 10/06 11/09 11/22
28 4/10 3/23 3/26 4/24 5/07 10/23 10/08 10/10 11/20 11/22
24 4/06 3/13 3/16 4/16 4/22 11/03 10/12 10/22 11/21 11/25
20 3/21 3/09 3/12 4/10 4/19 11/13 10/20 10/29 11/30 12/11
16 3/13 2/06 2/18 3/24 4/07 11/22 11/01 11/09 12/21 12/22

Length of Growing Season (Days)

Derived from 1977-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 172 142 150 199 208
30 186 150 167 216 228
28 198 166 172 228 241
24 211 191 196 237 252
20 229 210 214 258 266
16 260 222 229 288 295

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