Historical Climate Data

Precipitation Summary

Station: 112353 DIXON SPRINGS AGRIC CNTR, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 3.37 3.39 4.60 4.74 5.16 4.10 3.75 3.60 3.26 3.16 4.71 4.40 48.24

Precipitation Extremes

Period of Record: 1967-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 9.55 1969 0.80 1970 5.09 01-03-2000
Feb 9.20 1989 0.78 1996 2.72 02-23-1975
Mar 8.84 1977 1.51 1971 4.11 03-28-1977
Apr 12.40 1983 2.01 1971 5.47 04-15-1972
May 12.86 2003 0.61 1994 5.52 05-27-1973
Jun 9.18 1969 0.71 1991 4.60 06-23-1969
Jul 8.50 2006 0.54 1970 3.46 07-26-2001
Aug 11.57 1985 0.42 1976 4.07 08-24-1985
Sep 8.52 2006 0.00 2004 4.35 09-20-2002
Oct 7.74 2001 0.42 2005 3.05 10-09-1999
Nov 8.62 1973 0.56 1999 2.98 11-24-1973
Dec 14.71 1982 0.67 1976 4.97 12-03-1982
             
Annual 61.91 2006 34.39 1980 5.52 05-27-1973
Winter 17.61 1983 4.51 1977 5.09 01-03-2000
Spring 25.29 1983 7.91 1971 5.52 05-27-1973
Summer 20.53 1985 3.73 1991 4.60 06-23-1969
Fall 20.54 2006 4.18 1999 4.35 09-20-2002

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 8.6 5.8 2.0 0.9
Feb 8.5 5.7 2.5 0.9
Mar 10.9 7.7 3.5 1.1
Apr 10.6 7.6 3.5 1.3
May 10.2 7.6 3.7 1.5
Jun 9.2 7.1 2.8 1.1
Jul 7.6 5.7 2.7 1.1
Aug 6.9 5.0 2.2 1.1
Sep 6.9 4.9 2.2 1.3
Oct 7.2 5.1 2.3 0.8
Nov 9.3 7.1 3.3 1.5
Dec 9.3 6.5 3.1 1.2
         
Annual 105.1 75.6 33.6 13.9
Winter 26.4 18.0 7.6 3.0
Spring 31.7 22.9 10.6 3.9
Summer 23.7 17.8 7.6 3.4
Fall 23.4 17.0 7.8 3.7

Temperature Summary

Station 112353 DIXON SPRINGS AGRIC CNTR, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 43.1 49.8 60.5 70.7 78.9 86.7 90.3 89.6 83.5 73.1 58.9 47.3 69.4
Low °F 24.9 29.1 37.9 46.4 55.0 63.2 67.2 65.1 58.1 46.8 38.7 29.3 46.8
Mean °F 34.0 39.5 49.2 58.6 67.0 75.0 78.8 77.4 70.8 60.0 48.8 38.3 58.1
HDD 961 715 497 219 80 2 0 2 27 202 489 828 4022
CDD 0 0 6 25 141 301 426 384 199 46 3 0 1531

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

Temperature Extremes

Period of Record: 1967-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 45.2 2006 18.6 1977 70 01-21-1986 -20 01-17-1977
Feb 46.7 1992 23.9 1978 78 02-27-1996 -10 02-04-1996
Mar 54.7 1973 40.0 1969 83 03-31-1986 -3 03-05-1978
Apr 64.9 2001 51.5 1983 89 04-21-1987 21 04-11-1989
May 72.2 1998 60.9 1976 93 05-31-2002 29 05-04-1976
Jun 78.9 2002 66.6 2003 100 06-23-1988 39 06-01-1972
Jul 82.2 1980 74.0 2003 101 07-29-1999 46 07-31-1971
Aug 82.6 1980 71.8 1976 102 08-17-1988 46 08-29-1986
Sep 76.4 2002 63.6 1974 100 09-04-1999 32 09-22-1983
Oct 66.3 1971 53.1 1988 91 10-01-1971 17 10-24-1981
Nov 55.6 1999 39.4 1976 83 11-02-1971 6 11-30-1976
Dec 45.5 1984 26.9 1983 77 12-02-1982 -14 12-22-1989
                 
Annual 61.2 1998 54.4 2003 102 08-17-1988 -20 01-17-1977
Winter 42.1 1992 27.3 1978 78 02-27-1996 -20 01-17-1977
Spring 61.7 1977 54.0 1971 93 05-31-1902 -3 03-05-1978
Summer 80.6 2002 71.8 2003 102 08-17-1988 39 06-01-1972
Fall 63.6 1998 53.2 1976 100 09-04-1999 6 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 7.0 22.8 1.2
Feb 0.0 3.5 16.7 0.5
Mar 0.0 0.4 11.1 0.0
Apr 0.0 0.0 2.8 0.0
May 0.8 0.0 0.1 0.0
Jun 7.9 0.0 0.0 0.0
Jul 15.5 0.0 0.0 0.0
Aug 12.5 0.0 0.0 0.0
Sep 4.6 0.0 0.0 0.0
Oct 0.0 0.0 3.2 0.0
Nov 0.0 0.1 9.6 0.0
Dec 0.0 3.6 18.5 0.4
         
Annual 41.7 14.4 84.2 2.1
Winter 0.0 14.0 57.9 2.1
Spring 0.8 0.4 14.1 0.0
Summer 35.9 0.0 0.0 0.0
Fall 4.6 0.1 12.9 0.0

Snowfall Summary

Station: 112353 DIXON SPRINGS AGRIC CNTR, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 3.7 3.1 1.1 0.1 0.0 0.0 0.0 0.0 0.0 0.2 0.1 1.1 9.4

Snowfall Extremes

Period of Record: 1967-2006

Month High (in) Year 1-Day Max (in) Date
Jan 18.5 1978 8.5 01-16-1978
Feb 17.0 1993 10.5 02-25-1993
Mar 10.0 1970 9.0 03-17-1970
Apr 3.5 1971 3.5 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 5.5 1993 4.0 10-30-1993
Nov 2.0 1977 2.0 11-27-1977
Dec 10.5 2004 9.3 12-22-2004
Season (Jul-Jun) 31.6 1977-1978 10.5 02-25-1993

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 1.7 1.0 0.6 0.1
Feb 1.7 1.0 0.6 0.1
Mar 0.5 0.3 0.2 0.1
Apr 0.0 0.0 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 0.1 0.1 0.0 0.0
Nov 0.0 0.0 0.0 0.0
Dec 0.6 0.4 0.2 0.1
Annual 5.0 3.0 1.7 0.4

Growing Season Summary

Station: 112353 DIXON SPRINGS AGRIC CNTR, 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 64 126 310 546 822 1035 1187 1143 904 603 289 108 7118
45 29 68 200 403 667 885 1032 988 754 453 185 54 5707
50 12 31 117 274 513 735 877 833 605 314 107 23 4436
55 4 11 58 167 362 586 722 678 457 196 53 8 3302
60 0 2 23 87 227 436 567 523 318 103 20 2 2311
50** 34 72 187 341 537 709 817 780 602 389 164 54 4677

**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 3/23 3/26 4/26 5/10 10/19 9/21 10/04 10/31 11/10
30 4/09 3/23 3/24 4/22 5/05 10/22 10/03 10/05 11/10 11/13
28 4/07 3/07 3/16 4/13 4/23 10/28 10/03 10/12 11/15 11/23
24 3/25 2/21 3/07 4/11 4/19 11/14 10/21 10/29 12/02 12/09
20 3/08 1/30 2/11 3/21 3/25 11/25 10/24 11/03 12/19 12/25
16 2/25 1/10 2/01 3/20 3/24 12/10 11/03 11/11 12/24 1/02

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 189 154 170 205 216
30 196 167 177 214 234
28 209 183 191 226 244
24 232 202 209 268 277
20 261 228 240 290 303
16 290 229 249 317 346

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