Historical Climate Data

Precipitation Summary

Station: 118293 STOCKTON 3 NNE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.15 1.40 2.35 3.52 3.81 4.65 3.17 4.35 3.80 2.70 2.69 1.61 35.20

Precipitation Extremes

Period of Record: 1943-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 5.09 1960 0.03 1981 2.90 01-12-1960
Feb 4.07 1974 0.00 1995 1.83 02-21-1997
Mar 6.31 1990 0.22 1958 2.25 03-19-1948
Apr 8.38 1973 0.67 1946 3.00 04-16-1972
May 9.69 1974 0.51 1992 3.50 05-13-1978
Jun 13.62 1993 0.21 1988 4.30 06-04-2002
Jul 9.06 1962 0.55 1991 4.55 07-02-1962
Aug 13.31 2002 0.34 1978 6.40 08-22-2002
Sep 11.46 1986 0.19 1979 4.36 09-13-1961
Oct 9.28 1984 0.00 1952 2.80 10-19-1984
Nov 6.28 1985 0.23 1976 2.40 11-16-1961
Dec 5.57 1973 0.24 1975 2.01 12-15-1971
             
Annual 48.95 1973 19.12 1976 6.40 08-22-2002
Winter 12.60 1974 1.15 1987 2.90 01-12-1960
Spring 21.42 1973 3.21 1994 3.50 05-13-1978
Summer 22.18 1993 4.69 1988 6.40 08-22-2002
Fall 17.69 1961 3.18 1976 4.36 09-13-1961

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 7.5 3.3 0.7 0.1
Feb 6.2 3.7 0.9 0.2
Mar 8.2 5.1 1.6 0.4
Apr 10.8 7.2 2.5 0.9
May 11.2 7.5 2.6 0.9
Jun 10.2 7.3 3.2 1.5
Jul 9.4 6.2 2.4 0.6
Aug 10.0 7.0 3.2 1.3
Sep 9.0 6.3 2.3 1.1
Oct 8.8 5.9 1.8 0.6
Nov 8.9 5.5 2.0 0.6
Dec 8.0 3.9 1.0 0.2
         
Annual 108.2 68.9 24.4 8.5
Winter 21.7 10.8 2.6 0.5
Spring 30.2 19.8 6.8 2.2
Summer 29.6 20.4 8.8 3.5
Fall 26.7 17.7 6.1 2.3

Temperature Summary

Station 118293 STOCKTON 3 NNE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 26.2 32.1 44.1 58.2 70.3 79.0 81.9 80.0 72.7 61.3 44.6 31.0 56.8
Low °F 9.5 15.7 25.9 36.3 47.7 56.7 60.8 58.6 50.2 38.9 28.1 15.4 37.0
Mean °F 17.9 23.9 35.0 47.3 59.0 67.9 71.4 69.3 61.5 50.1 36.4 23.2 46.9
HDD 1461 1152 930 534 234 39 10 34 149 464 860 1295 7162
CDD 0 0 0 2 48 124 207 166 41 3 0 0 591

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

Temperature Extremes

Period of Record: 1948-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 32.4 2006 4.5 1979 61 01-27-2002 -28 01-20-1985
Feb 35.7 1998 10.0 1979 66 02-25-2000 -30 02-03-1996
Mar 42.8 1973 22.6 1960 84 03-30-1986 -18 03-01-1962
Apr 54.4 1977 41.1 1950 91 04-23-1980 7 04-07-1982
May 66.8 1977 53.8 1954 93 05-27-1985 24 05-03-1978
Jun 73.0 2005 62.6 1982 99 06-21-1988 37 06-21-1992
Jul 76.9 1955 66.9 1992 99 07-01-1963 40 07-01-1988
Aug 75.5 1959 64.3 1992 99 08-18-1988 39 08-15-1979
Sep 67.8 1978 56.3 1993 98 09-01-1953 26 09-29-1949
Oct 61.6 1963 44.4 1987 89 10-02-1953 13 10-30-1988
Nov 47.6 2001 28.2 1995 77 11-01-2000 -10 11-24-1950
Dec 32.2 1959 9.9 1983 66 12-04-1998 -24 12-19-1983
                 
Annual 51.1 1998 43.5 1985 99 06-21-1988 -30 02-03-1996
Winter 30.6 2002 11.4 1979 66 12-04-1998 -30 02-03-1996
Spring 54.1 1977 42.8 1996 93 05-27-1985 -18 03-01-1962
Summer 73.0 1988 65.2 1992 99 06-21-1988 37 06-21-1992
Fall 55.5 1963 45.7 1976 98 09-01-1953 -10 11-24-1950

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 21.2 30.4 9.3
Feb 0.0 13.6 26.2 5.3
Mar 0.0 5.1 24.0 0.5
Apr 0.1 0.3 9.9 0.0
May 0.3 0.0 0.9 0.0
Jun 1.4 0.0 0.0 0.0
Jul 3.4 0.0 0.0 0.0
Aug 1.9 0.0 0.0 0.0
Sep 0.6 0.0 0.8 0.0
Oct 0.0 0.0 7.8 0.0
Nov 0.0 4.3 21.0 0.2
Dec 0.0 16.2 29.5 5.0
         
Annual 7.8 60.1 150.6 20.2
Winter 0.0 51.0 86.2 19.5
Spring 0.4 5.5 34.9 0.5
Summer 6.8 0.0 0.0 0.0
Fall 0.5 4.3 29.9 0.2

Snowfall Summary

Station: 118293 STOCKTON 3 NNE, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 10.0 6.7 4.4 1.9 0.1 0.0 0.0 0.0 0.0 0.3 2.5 8.2 34.1

Snowfall Extremes

Period of Record: 1943-2006

Month High (in) Year 1-Day Max (in) Date
Jan 27.0 1979 10.0 01-05-1982
Feb 17.9 1960 9.0 02-18-1962
Mar 18.6 1972 11.0 03-29-1972
Apr 12.0 1973 12.0 04-10-1973
May 2.5 1994 2.5 05-01-1994
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 3.3 1997 3.3 10-26-1997
Nov 10.0 1986 4.1 11-26-1993
Dec 29.0 2000 9.2 12-11-2000
Season (Jul-Jun) 59.4 1961-1962 12.0 04-10-1973

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 3.9 2.6 1.6 0.2
Feb 3.9 2.6 1.6 0.2
Mar 2.2 1.6 0.9 0.2
Apr 0.7 0.6 0.4 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 0.2 0.1 0.0 0.0
Nov 1.8 1.0 0.5 0.0
Dec 4.8 3.1 1.6 0.3
Annual 17.7 11.4 6.8 1.2

Growing Season Summary

Station: 118293 STOCKTON 3 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 1 7 67 253 593 850 985 915 652 339 73 8 4718
45 0 1 34 149 442 700 831 762 504 217 33 3 3658
50 0 0 15 77 300 550 676 609 360 123 13 1 2713
55 0 0 6 36 181 401 522 456 231 59 3 0 1890
60 0 0 2 15 97 261 369 307 130 22 0 0 1199
50** 0 4 43 154 357 552 665 605 400 198 38 3 3005

**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 5/02 4/13 4/21 5/12 5/17 10/04 9/17 9/22 10/14 11/01
30 4/23 3/31 4/09 5/08 5/12 10/07 9/19 9/24 10/22 11/04
28 4/18 3/26 4/04 5/05 5/08 10/13 9/22 9/29 11/05 11/12
24 4/09 3/24 3/29 4/21 5/03 11/02 10/06 10/11 11/15 11/20
20 3/27 3/06 3/15 4/10 4/18 11/05 10/10 10/20 11/23 11/29
16 3/20 2/17 3/01 4/07 4/09 11/21 10/31 11/05 12/03 12/08

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 157 123 137 173 202
30 170 138 145 189 205
28 176 150 160 208 217
24 203 168 185 224 226
20 218 190 197 250 258
16 246 217 219 270 293

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