Historical Climate Data

Precipitation Summary

Station: 113940 HAVANA 4 NNE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.85 1.94 3.02 3.45 4.43 3.81 3.87 3.45 3.21 2.86 3.26 2.63 37.78

Precipitation Extremes

Period of Record: 1917-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 5.90 1965 0.12 1956 2.64 01-24-1938
Feb 4.99 1997 0.00 1987 2.71 02-21-1997
Mar 7.11 1973 0.00 1917 2.65 03-20-1927
Apr 7.25 1927 0.41 1971 3.09 04-11-1944
May 10.75 1995 0.36 1934 4.35 05-20-1984
Jun 9.41 1990 0.42 1933 4.40 06-05-1917
Jul 11.27 1961 0.38 1957 7.14 07-13-1937
Aug 7.71 1977 0.55 1935 4.10 08-04-1960
Sep 11.61 1961 0.02 1940 3.90 09-14-1961
Oct 12.66 1941 0.00 1964 3.30 10-11-1969
Nov 10.83 1985 0.11 1917 2.52 11-05-1990
Dec 6.46 1982 0.00 1919 2.60 12-23-2003
             
Annual 60.51 1993 23.48 1989 7.14 07-13-1937
Winter 13.17 1950 1.04 1920 2.71 02-21-1997
Spring 19.07 1927 4.12 1971 4.35 05-20-1984
Summer 25.71 1993 4.44 1983 7.14 07-13-1937
Fall 21.40 1941 2.47 1939 3.90 09-14-1961

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 7.4 4.9 1.0 0.3
Feb 6.4 4.3 1.3 0.3
Mar 8.7 6.2 1.9 0.7
Apr 9.6 7.0 2.6 0.6
May 10.1 8.2 3.2 1.0
Jun 8.4 6.4 3.0 1.0
Jul 8.2 6.7 2.5 1.0
Aug 7.1 5.6 2.3 1.0
Sep 6.7 5.5 2.1 0.9
Oct 7.1 5.4 1.7 0.8
Nov 7.7 6.0 2.3 0.9
Dec 8.0 5.5 1.7 0.7
         
Annual 95.4 71.7 25.7 9.2
Winter 21.7 14.7 4.1 1.4
Spring 28.5 21.5 7.8 2.3
Summer 23.7 18.7 7.8 3.0
Fall 21.5 16.9 6.1 2.6

Temperature Summary

Station 113940 HAVANA 4 NNE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 31.9 38.0 50.2 63.0 74.0 84.0 88.4 86.4 79.9 67.6 50.9 37.2 62.6
Low °F 14.0 19.2 29.7 40.3 50.8 60.4 63.9 61.2 52.3 40.5 30.2 19.4 40.2
Mean °F 23.0 28.6 40.0 51.7 62.4 72.2 76.2 73.8 66.1 54.1 40.6 28.3 51.4
HDD 1303 1020 776 407 164 13 0 14 63 348 733 1139 5980
CDD 0 0 0 7 84 229 346 287 96 10 0 0 1059

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

Temperature Extremes

Period of Record: 1958-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 37.0 2006 10.7 1979 70 01-24-1967 -30 01-05-1999
Feb 40.0 1976 14.5 1979 75 02-29-1972 -25 02-09-1979
Mar 47.4 1973 31.5 1978 88 03-30-1986 -13 03-05-1978
Apr 61.2 1977 46.2 1982 95 04-26-1986 16 04-06-1982
May 68.5 1987 57.6 1997 96 05-19-1977 27 05-03-2005
Jun 78.7 1971 67.4 2003 104 06-26-1988 40 06-01-2003
Jul 81.6 1983 73.3 1992 106 07-23-1983 46 07-31-1971
Aug 81.5 1983 69.0 1992 106 08-19-1983 38 08-29-1986
Sep 71.0 2005 61.5 1993 100 09-02-1984 28 09-23-1995
Oct 62.2 1971 48.1 1987 95 10-04-2006 19 10-24-1981
Nov 48.8 2001 34.4 1996 82 11-02-2000 1 11-26-1977
Dec 37.4 1982 14.6 1983 72 12-09-1991 -23 12-20-1983
                 
Annual 54.3 2006 47.2 1978 106 07-23-1983 -30 01-05-1999
Winter 33.2 1992 18.0 1979 75 02-29-1972 -30 01-05-1999
Spring 58.1 1977 47.9 1996 96 05-19-1977 -13 03-05-1978
Summer 78.8 1983 70.5 2004 106 07-23-1983 38 08-29-1986
Fall 58.8 1971 50.9 1976 100 09-02-1984 1 11-26-1977

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 15.3 29.0 5.7
Feb 0.0 8.8 23.9 3.5
Mar 0.0 2.2 18.6 0.1
Apr 0.2 0.1 5.2 0.0
May 1.7 0.0 0.2 0.0
Jun 7.7 0.0 0.0 0.0
Jul 12.5 0.0 0.0 0.0
Aug 9.0 0.0 0.0 0.0
Sep 4.1 0.0 0.3 0.0
Oct 0.1 0.0 5.8 0.0
Nov 0.0 1.7 17.4 0.0
Dec 0.0 9.3 26.9 2.8
         
Annual 35.4 37.1 127.0 12.1
Winter 0.0 33.3 79.8 12.0
Spring 1.9 2.3 23.7 0.1
Summer 29.2 0.0 0.0 0.0
Fall 4.2 1.7 23.5 0.0

Snowfall Summary

Station: 113940 HAVANA 4 NNE, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 9.7 7.0 3.4 1.2 0.0 0.0 0.0 0.0 0.0 0.0 1.5 6.8 29.6

Snowfall Extremes

Period of Record: 1917-2006

Month High (in) Year 1-Day Max (in) Date
Jan 32.5 1979 14.0 01-30-1939
Feb 21.0 1986 10.0 02-14-1978
Mar 18.0 1960 11.0 03-09-1999
Apr 11.5 1982 10.8 04-11-1997
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 4.0 1925 3.0 10-30-1925
Nov 10.0 1975 8.0 11-27-1975
Dec 23.0 2000 14.6 12-01-2006
Season (Jul-Jun) 69.5 1981-1982 14.6 12-01-2006

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 3.1 2.5 1.5 0.4
Feb 3.1 2.5 1.5 0.4
Mar 1.9 1.4 0.6 0.1
Apr 0.3 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 1.0 0.6 0.3 0.1
Dec 3.3 2.8 1.6 0.2
Annual 14.1 11.1 6.2 1.3

Growing Season Summary

Station: 113940 HAVANA 4 NNE, 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 9 35 148 376 701 970 1128 1059 794 457 146 27 5813
45 3 13 81 253 549 821 974 905 645 318 81 12 4627
50 0 4 42 151 399 673 820 750 498 201 39 4 3563
55 0 0 19 80 263 525 666 595 355 112 15 1 2621
60 0 0 7 37 151 380 512 441 230 52 4 0 1808
50** 6 24 96 230 433 645 763 712 515 293 90 17 3803

**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 4/19 3/31 4/06 5/02 5/16 10/12 9/21 9/24 10/26 11/05
30 4/10 3/28 4/01 4/21 4/29 10/14 9/22 10/02 11/05 11/06
28 4/07 3/23 3/28 4/15 4/23 10/23 9/22 10/07 11/12 11/20
24 3/29 3/01 3/17 4/12 4/18 11/04 10/07 10/16 11/19 11/30
20 3/18 2/07 2/22 3/31 4/10 11/13 10/20 11/01 11/30 12/11
16 3/05 2/07 2/09 3/23 4/06 11/23 11/02 11/08 12/11 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 173 140 157 198 206
30 190 163 171 202 208
28 200 170 185 217 236
24 220 187 193 242 251
20 240 217 221 271 278
16 266 223 236 290 301

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