Historical Climate Data

Precipitation Summary

Station: 110203 ANTIOCH, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.74 1.42 2.17 3.77 3.59 4.22 4.03 4.50 3.50 2.49 2.88 2.19 36.50

Precipitation Extremes

Period of Record: 1901-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.61 1965 0.10 1981 2.50 01-19-1907
Feb 3.56 1986 0.02 1987 1.62 02-21-1997
Mar 7.47 1976 0.00 1998 2.85 03-05-1976
Apr 8.68 1909 0.27 1998 2.75 04-29-1909
May 9.10 2004 0.87 1992 2.60 05-22-2004
Jun 11.78 2000 0.12 1922 4.64 06-13-2000
Jul 8.90 1996 0.25 1946 8.10 07-18-1996
Aug 11.28 1979 0.17 1917 4.96 08-18-1979
Sep 15.91 1986 0.05 1979 3.81 09-23-1986
Oct 7.75 1991 0.09 1952 3.00 10-05-1991
Nov 6.92 1985 0.58 1999 2.72 11-12-1995
Dec 6.00 1987 0.00 1913 2.00 12-14-1907
             
Annual 49.21 2000 22.04 1989 8.10 07-18-1996
Winter 10.11 1974 1.52 1963 2.50 01-19-1907
Spring 14.87 1976 3.27 1998 2.85 03-05-1976
Summer 20.56 2000 4.37 1961 8.10 07-18-1996
Fall 19.13 1986 1.98 1956 3.81 09-23-1986

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 9.2 4.5 0.9 0.3
Feb 8.1 4.1 0.7 0.2
Mar 8.8 5.1 1.3 0.3
Apr 11.1 6.8 2.5 0.9
May 11.4 7.1 2.8 0.8
Jun 10.5 7.3 2.7 0.8
Jul 9.7 6.6 2.8 1.0
Aug 9.8 6.7 3.2 1.3
Sep 9.0 5.7 2.2 0.9
Oct 9.3 5.3 1.5 0.6
Nov 9.3 5.9 1.9 0.6
Dec 9.5 5.5 1.2 0.5
         
Annual 115.6 70.5 23.7 8.2
Winter 26.8 14.1 2.8 0.9
Spring 31.2 18.9 6.6 2.0
Summer 30.0 20.5 8.7 3.1
Fall 27.6 16.9 5.6 2.1

Temperature Summary

Station 110203 ANTIOCH, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 27.8 32.9 43.6 56.3 68.8 78.3 82.2 80.3 72.8 61.3 46.1 33.0 57.0
Low °F 11.4 16.0 27.0 36.9 47.2 56.9 62.3 61.3 53.6 41.5 30.1 18.1 38.5
Mean °F 19.6 24.5 35.3 46.6 58.0 67.6 72.3 70.8 63.2 51.4 38.1 25.6 47.8
HDD 1408 1135 921 554 260 51 8 26 111 427 806 1223 6930
CDD 0 0 0 1 42 129 233 206 55 4 0 0 670

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

Temperature Extremes

Period of Record: 1901-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 33.0 2006 4.9 1912 61 01-25-1950 -29 01-11-1979
Feb 35.8 1998 12.6 1904 70 02-26-2000 -25 02-13-1905
Mar 45.1 1910 23.3 1912 86 03-21-1907 -15 03-01-1962
Apr 54.1 1915 38.9 1907 90 04-23-1980 6 04-07-1982
May 64.2 1959 51.0 1907 94 05-27-1911 23 05-04-1907
Jun 73.1 2005 60.4 1982 100 06-30-1910 33 06-11-1972
Jul 78.9 1921 67.6 1915 105 07-05-1911 42 07-02-1904
Aug 77.0 1988 64.5 1915 104 08-01-1988 38 08-30-1915
Sep 69.3 1908 57.5 1975 102 09-06-1922 28 09-24-1976
Oct 61.2 1963 42.3 1917 89 10-01-1971 17 10-31-1917
Nov 48.0 2001 29.2 1976 77 11-01-1950 -6 11-29-1976
Dec 34.4 1998 13.6 1983 68 12-06-2001 -24 12-25-1983
                 
Annual 52.0 1998 43.9 1917 105 07-05-1911 -29 01-11-1979
Winter 31.3 2002 13.9 1977 70 02-26-1900 -29 01-11-1979
Spring 51.9 1921 41.1 1996 94 05-27-1911 -15 03-01-1962
Summer 74.5 1921 65.1 1915 105 07-05-1911 33 06-11-1972
Fall 56.1 1963 44.4 1976 102 09-06-1922 -6 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 19.4 29.9 8.7
Feb 0.0 13.6 26.4 6.1
Mar 0.0 4.9 24.2 0.7
Apr 0.0 0.3 11.4 0.0
May 0.1 0.0 1.6 0.0
Jun 1.9 0.0 0.0 0.0
Jul 3.6 0.0 0.0 0.0
Aug 2.5 0.0 0.0 0.0
Sep 0.8 0.0 0.4 0.0
Oct 0.0 0.0 6.5 0.0
Nov 0.0 3.2 19.2 0.2
Dec 0.0 13.4 28.7 3.8
         
Annual 8.9 54.7 148.3 19.4
Winter 0.0 46.6 85.1 18.7
Spring 0.1 5.3 37.4 0.7
Summer 8.0 0.0 0.0 0.0
Fall 0.9 3.2 25.9 0.2

Snowfall Summary

Station: 110203 ANTIOCH, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 12.9 8.8 6.5 2.5 0.0 0.0 0.0 0.0 0.0 0.1 3.1 11.5 45.4

Snowfall Extremes

Period of Record: 1901-2006

Month High (in) Year 1-Day Max (in) Date
Jan 47.1 1979 19.0 01-01-1985
Feb 22.3 1974 13.0 02-10-1960
Mar 26.3 1965 10.0 03-26-1970
Apr 14.7 1973 9.0 04-02-1970
May 1.0 1966 1.0 05-11-1966
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 3.0 1967 3.0 10-27-1967
Nov 10.4 1977 5.5 11-27-1976
Dec 39.1 2000 13.2 12-29-1987
Season (Jul-Jun) 105.1 1978-1979 19.0 01-01-1985

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 5.6 3.3 2.1 0.3
Feb 5.6 3.3 2.1 0.3
Mar 3.6 2.1 1.3 0.3
Apr 1.3 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 0.1 0.0 0.0 0.0
Nov 2.1 1.3 0.6 0.0
Dec 6.7 3.8 2.3 0.4
Annual 25.9 15.0 9.2 1.7

Growing Season Summary

Station: 110203 ANTIOCH, 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 8 58 221 525 790 967 929 669 348 87 11 4537
45 0 2 28 127 378 642 813 775 521 220 41 4 3484
50 0 0 11 66 246 494 659 620 376 123 17 1 2558
55 0 0 4 32 143 350 504 466 243 58 4 0 1760
60 0 0 1 14 73 220 352 315 139 21 0 0 1101
50** 1 5 38 134 316 504 645 613 410 201 46 5 2868

**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 5/06 4/10 4/19 5/13 5/27 10/10 9/22 9/24 10/22 10/24
30 4/28 3/26 4/08 5/10 5/13 10/13 9/22 9/24 11/03 11/11
28 4/22 3/26 4/06 5/07 5/08 10/28 9/25 10/03 11/12 11/20
24 4/10 3/22 3/29 4/22 4/29 11/05 10/02 10/20 11/22 12/21
20 3/26 2/21 3/16 4/09 4/12 11/13 10/20 11/02 11/30 12/22
16 3/20 2/14 3/03 4/07 4/09 11/22 11/06 11/09 12/08 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 161 135 138 179 187
30 171 137 140 211 217
28 186 148 149 214 225
24 206 176 193 229 274
20 224 207 210 266 281
16 250 218 221 281 284

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