Historical Climate Data

Precipitation Summary

Station: 119029 WAUKEGAN, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.60 1.40 2.15 3.73 3.44 3.62 3.49 4.22 3.40 2.42 2.57 2.05 34.09

Precipitation Extremes

Period of Record: 1923-2002


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 5.26 1965 0.00 1987 2.37 01-24-1938
Feb 4.57 1997 0.18 1987 2.50 02-21-1997
Mar 5.90 1983 0.30 1936 2.23 03-05-1976
Apr 7.11 1993 0.57 1986 2.50 04-02-1983
May 8.13 1945 0.34 1992 1.97 05-19-1996
Jun 9.86 1993 0.98 1995 4.00 06-20-1972
Jul 7.50 1982 0.26 1946 3.40 07-22-1982
Aug 10.57 1987 0.35 1925 3.70 08-07-1984
Sep 15.11 1986 0.00 2002 3.10 09-26-1986
Oct 10.24 1941 0.00 1952 3.01 10-14-2001
Nov 5.89 1935 0.31 1999 2.36 11-17-1928
Dec 5.60 1982 0.27 1962 2.44 12-03-1982
             
Annual 50.33 1972 18.33 1989 4.00 06-20-1972
Winter 11.98 1974 1.21 1931 2.50 02-21-1997
Spring 14.44 1945 2.82 1934 2.50 04-02-1983
Summer 22.16 1972 4.67 1946 4.00 06-20-1972
Fall 21.45 1941 2.07 1956 3.10 09-26-1986

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 7.9 4.2 1.0 0.2
Feb 7.1 3.9 0.7 0.2
Mar 8.7 5.1 1.3 0.5
Apr 10.4 7.1 2.7 1.1
May 10.6 6.8 2.5 0.9
Jun 9.7 6.7 2.4 0.8
Jul 9.1 5.9 2.5 1.1
Aug 9.4 6.4 3.3 1.3
Sep 8.6 5.8 2.5 0.9
Oct 8.3 5.0 1.5 0.4
Nov 9.3 5.9 1.8 0.5
Dec 9.1 5.1 1.4 0.3
         
Annual 108.4 68.3 24.1 8.3
Winter 24.1 13.3 3.1 0.6
Spring 29.6 19.1 6.5 2.5
Summer 28.3 19.0 8.2 3.2
Fall 26.1 16.6 5.9 1.8

Temperature Summary

Station 119029 WAUKEGAN, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 28.5 32.9 43.0 54.6 66.7 77.1 81.7 80.1 73.1 61.6 47.3 33.9 56.7
Low °F 12.0 16.6 26.0 35.6 45.8 55.3 61.3 60.5 52.4 40.9 29.9 18.3 37.9
Mean °F 20.3 24.8 34.5 45.1 56.3 66.2 71.5 70.3 62.8 51.3 38.6 26.1 47.3
HDD 1387 1126 945 598 301 79 11 37 118 430 793 1206 7031
CDD 0 0 0 0 30 114 213 201 50 5 0 0 613

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

Temperature Extremes

Period of Record: 1923-2002


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 35.0 1933 8.8 1979 64 01-25-1950 -27 01-19-1985
Feb 36.1 1998 11.5 1936 71 02-26-2000 -24 02-09-1933
Mar 47.7 1945 24.8 1960 83 03-27-1945 -12 03-01-1962
Apr 52.1 1955 40.0 1975 92 04-10-1930 8 04-07-1982
May 63.6 1977 49.5 1935 95 05-09-1934 24 05-10-1966
Jun 73.8 1933 59.7 1982 105 06-01-1934 32 06-09-1929
Jul 77.5 1999 65.7 1924 108 07-24-1934 41 07-03-1924
Aug 77.3 1947 64.7 1986 102 08-01-1988 40 08-29-1935
Sep 69.9 1931 56.3 1924 103 09-07-1939 27 09-25-1942
Oct 61.7 1963 40.6 1925 90 10-06-1963 11 10-29-1925
Nov 47.5 1931 30.8 1976 80 11-01-1944 -5 11-24-1950
Dec 35.6 1931 12.9 1983 69 12-06-2001 -23 12-24-1983
                 
Annual 51.9 1998 42.7 1985 108 07-24-1934 -27 01-19-1985
Winter 32.9 1932 14.8 1979 71 02-26-1900 -27 01-19-1985
Spring 51.1 1977 41.0 1996 95 05-09-1934 -12 03-01-1962
Summer 74.1 1983 64.2 1924 108 07-24-1934 32 06-09-1929
Fall 57.9 1931 46.4 1976 103 09-07-1939 -5 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 19.0 29.5 7.0
Feb 0.0 12.8 26.2 4.0
Mar 0.0 5.0 23.8 0.3
Apr 0.0 0.3 10.3 0.0
May 0.3 0.0 0.9 0.0
Jun 2.2 0.0 0.0 0.0
Jul 4.3 0.0 0.0 0.0
Aug 2.9 0.0 0.0 0.0
Sep 0.9 0.0 0.3 0.0
Oct 0.0 0.0 5.0 0.0
Nov 0.0 2.3 18.3 0.1
Dec 0.0 13.2 27.9 3.4
         
Annual 10.6 52.4 141.5 14.7
Winter 0.0 45.0 83.6 14.4
Spring 0.3 5.4 35.4 0.3
Summer 9.3 0.0 0.0 0.0
Fall 0.9 2.2 22.7 0.1

Snowfall Summary

Station: 119029 WAUKEGAN, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 11.5 9.5 5.3 1.4 0.0 0.0 0.0 0.0 0.0 0.1 1.9 8.2 37.9

Snowfall Extremes

Period of Record: 1923-2002

Month High (in) Year 1-Day Max (in) Date
Jan 40.5 1979 18.0 01-03-1999
Feb 23.9 1967 14.0 02-10-1960
Mar 27.7 1965 10.3 03-17-1965
Apr 11.0 1970 10.0 04-02-1970
May 0.6 1966 0.6 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 8.8 1975 6.5 11-27-1975
Dec 37.0 2000 10.2 12-28-1987
Season (Jul-Jun) 75.0 1964-1965 18.0 01-03-1999

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 4.8 3.0 2.0 0.4
Feb 4.8 3.0 2.0 0.4
Mar 2.8 2.0 1.0 0.2
Apr 0.6 0.4 0.3 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 1.4 0.7 0.4 0.0
Dec 4.8 2.7 1.6 0.4
Annual 20.0 12.5 7.5 1.5

Growing Season Summary

Station: 119029 WAUKEGAN, 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 3 9 61 201 505 784 958 934 676 354 96 14 4519
45 0 2 30 112 358 635 806 780 528 224 46 5 3468
50 0 0 14 58 229 486 654 625 382 124 19 1 2549
55 0 0 5 28 132 343 502 471 248 59 6 0 1765
60 0 0 2 12 71 215 352 319 141 23 1 0 1116
50** 1 6 38 114 288 492 636 615 409 196 50 7 2806

**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 4/29 4/07 4/12 5/09 5/25 10/15 9/22 9/30 11/03 11/16
30 4/22 3/27 4/06 5/06 5/13 10/19 9/23 10/08 11/17 1/01
28 4/13 3/27 3/31 4/28 5/01 10/26 10/02 10/13 11/20 1/01
24 4/07 3/21 3/25 4/12 4/24 11/08 10/20 10/23 12/01 1/04
20 3/26 2/18 3/11 4/09 4/10 11/20 10/24 11/05 12/06 1/09
16 3/14 2/17 2/21 3/27 4/08 11/28 11/02 11/10 12/15 1/16

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 168 137 146 196 207
30 181 151 160 213 252
28 196 165 175 225 252
24 216 193 198 244 266
20 238 216 217 271 293
16 264 218 229 285 300

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