Historical Climate Data

Precipitation Summary

Station: 112223 DE KALB, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.54 1.40 2.46 3.52 4.21 4.49 4.22 4.48 3.51 2.60 2.82 2.13 37.38

Precipitation Extremes

Period of Record: 1966-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.08 1974 0.08 1981 1.47 01-13-1979
Feb 4.90 1997 0.06 1987 2.60 02-21-1997
Mar 6.37 1976 0.32 1968 1.58 03-04-1985
Apr 6.50 1973 0.88 1989 2.08 04-06-1988
May 10.44 2004 0.86 1992 2.81 05-21-2004
Jun 9.87 1993 0.33 1988 3.06 06-02-1970
Jul 11.40 1996 0.65 2002 8.09 07-18-1996
Aug 14.23 1987 1.11 1970 5.71 08-14-1987
Sep 11.56 1970 0.04 1979 3.47 09-28-1999
Oct 6.75 1969 0.53 2005 2.98 10-11-1969
Nov 7.02 1985 0.34 1999 2.20 11-11-1995
Dec 4.97 1982 0.35 1976 2.03 12-10-2003
             
Annual 49.64 1972 22.52 1968 8.09 07-18-1996
Winter 8.86 1974 1.42 1977 2.60 02-21-1997
Spring 16.50 2004 4.44 1994 2.81 05-21-2004
Summer 23.17 1996 4.25 1991 8.09 07-18-1996
Fall 15.93 1970 4.13 1979 3.47 09-28-1999

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 10.0 4.4 0.6 0.2
Feb 7.7 3.4 0.8 0.1
Mar 10.6 5.9 1.4 0.4
Apr 11.8 7.3 2.3 0.8
May 11.4 7.6 2.8 1.1
Jun 10.3 7.4 3.4 1.2
Jul 9.6 5.9 2.1 1.3
Aug 10.0 6.6 2.8 1.3
Sep 9.1 5.8 2.4 0.9
Oct 9.4 5.6 1.7 0.4
Nov 9.9 5.7 2.0 0.5
Dec 10.1 5.3 1.3 0.4
         
Annual 119.9 70.9 23.7 8.6
Winter 27.8 13.1 2.6 0.8
Spring 33.8 20.8 6.5 2.3
Summer 29.9 19.8 8.4 3.8
Fall 28.4 17.1 6.1 1.8

Temperature Summary

Station 112223 DE KALB, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 26.7 32.3 44.5 58.1 70.4 80.3 83.6 81.3 74.3 62.5 45.4 32.3 57.6
Low °F 10.3 15.5 26.2 36.8 48.1 58.4 62.6 60.5 51.4 39.9 28.2 16.9 37.9
Mean °F 18.5 23.9 35.4 47.5 59.3 69.4 73.1 70.9 62.9 51.2 36.8 24.6 47.8
HDD 1441 1152 919 528 230 29 5 29 116 432 845 1253 6979
CDD 0 0 0 2 52 159 256 212 51 4 0 0 736

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

Temperature Extremes

Period of Record: 1966-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 32.4 2006 7.6 1977 63 01-24-1967 -27 01-20-1985
Feb 36.6 1998 14.7 1989 69 02-26-2000 -23 02-03-1996
Mar 43.7 1973 28.9 1996 84 03-30-1986 -13 03-04-2002
Apr 56.0 1977 43.8 1975 92 04-26-1986 8 04-07-1982
May 68.4 1977 53.3 1997 95 05-26-1985 24 05-07-1989
Jun 74.5 2005 65.1 1982 101 06-26-1988 34 06-01-1993
Jul 78.0 1983 69.2 1992 102 07-14-1995 43 07-06-1967
Aug 78.6 1983 65.3 1992 103 08-17-1988 39 08-28-1986
Sep 70.3 1978 60.2 1975 94 09-08-1978 27 09-27-1991
Oct 58.8 1971 44.4 1987 89 10-02-1976 13 10-30-1988
Nov 47.1 2001 29.5 1995 76 11-09-1999 -8 11-29-1976
Dec 35.3 1982 12.6 2000 66 12-03-1970 -22 12-24-1983
                 
Annual 53.6 1966 45.8 1996 103 08-17-1988 -27 01-20-1985
Winter 31.1 1983 15.8 1979 69 02-26-1900 -27 01-20-1985
Spring 55.6 1977 43.1 1996 95 05-26-1985 -13 03-04-1902
Summer 76.1 1983 67.1 1992 103 08-17-1988 34 06-01-1993
Fall 54.9 1971 46.8 1976 94 09-08-1978 -8 11-29-1976

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 20.6 30.1 7.6
Feb 0.0 13.0 25.4 3.9
Mar 0.0 4.3 22.6 0.2
Apr 0.1 0.2 8.9 0.0
May 0.7 0.0 1.0 0.0
Jun 3.8 0.0 0.0 0.0
Jul 5.6 0.0 0.0 0.0
Aug 3.8 0.0 0.0 0.0
Sep 1.4 0.0 0.5 0.0
Oct 0.0 0.0 6.3 0.0
Nov 0.0 3.2 18.7 0.1
Dec 0.0 13.0 28.5 3.4
         
Annual 15.4 53.7 142.2 14.9
Winter 0.0 46.4 83.9 14.7
Spring 0.8 4.5 32.8 0.2
Summer 13.3 0.0 0.0 0.0
Fall 1.3 3.3 26.0 0.1

Snowfall Summary

Station: 112223 DE KALB, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 9.9 7.4 4.8 1.1 0.0 0.0 0.0 0.0 0.0 0.1 2.1 9.5 35.0

Snowfall Extremes

Period of Record: 1966-2006

Month High (in) Year 1-Day Max (in) Date
Jan 29.6 1979 15.6 01-13-1979
Feb 26.4 1994 8.0 02-19-2000
Mar 23.5 1972 8.0 03-29-1972
Apr 8.8 1975 5.9 04-02-1975
May 2.5 1966 2.5 05-11-1966
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 3.5 1967 3.5 10-27-1967
Nov 6.8 1997 4.0 11-27-1975
Dec 34.5 1978 10.6 12-15-1987
Season (Jul-Jun) 80.3 1978-1979 15.6 01-13-1979

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 4.7 2.6 1.5 0.2
Feb 4.7 2.6 1.5 0.2
Mar 3.1 1.5 1.0 0.2
Apr 0.6 0.4 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 0.1 0.1 0.0 0.0
Nov 2.2 0.8 0.4 0.0
Dec 6.0 2.9 1.8 0.4
Annual 24.2 11.9 6.3 1.2

Growing Season Summary

Station: 112223 DE KALB, 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 2 12 87 287 626 901 1045 974 728 388 97 14 5032
45 0 2 46 177 474 751 890 820 579 258 48 6 3947
50 0 0 22 98 329 601 735 666 433 153 21 2 2981
55 0 0 9 48 205 453 580 512 295 78 7 0 2130
60 0 0 2 22 113 310 425 359 180 31 1 0 1406
50** 1 7 54 175 383 594 711 652 461 232 51 6 3245

**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 4/28 3/28 4/12 5/12 5/27 10/08 9/19 9/23 10/22 11/01
30 4/22 3/25 4/08 5/12 5/27 10/13 9/19 9/24 11/04 11/08
28 4/13 3/24 4/04 4/30 5/11 10/21 9/26 10/03 11/10 11/20
24 4/07 3/14 3/24 4/21 5/07 11/03 10/07 10/19 11/18 11/22
20 3/23 2/27 3/14 4/09 4/13 11/11 10/20 10/27 11/27 11/29
16 3/17 2/17 2/24 4/04 4/09 11/22 10/31 11/05 12/10 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 164 125 138 183 204
30 175 125 142 208 213
28 193 146 162 219 225
24 213 174 186 232 240
20 229 194 209 256 265
16 253 222 229 280 284

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