Historical Climate Data

Precipitation Summary

Station: 113262 FREEPORT WASTE WTR PL, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.33 1.33 2.14 3.23 3.96 4.46 3.57 4.11 3.67 2.58 2.69 1.72 34.79

Precipitation Extremes

Period of Record: 1948-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 3.73 2005 0.05 1981 1.54 01-12-1960
Feb 4.22 2001 0.03 1987 2.05 02-08-2001
Mar 5.75 1976 0.25 1994 2.47 03-05-1976
Apr 7.15 2006 0.76 1985 3.72 04-17-2006
May 9.22 1996 0.56 1992 2.88 05-13-1978
Jun 11.48 1993 0.31 1988 4.78 06-04-2002
Jul 8.98 1959 0.63 1991 4.06 07-18-1977
Aug 10.20 2002 0.48 1962 9.12 08-22-2002
Sep 10.12 1986 0.11 1979 5.25 09-14-1961
Oct 6.51 1984 0.01 1952 2.59 10-31-1960
Nov 6.16 1985 0.37 1976 3.95 11-17-1952
Dec 4.30 1971 0.31 1976 2.04 12-15-1971
             
Annual 46.19 1972 21.19 1989 9.12 08-22-2002
Winter 8.31 2001 1.47 2003 2.05 02-08-2001
Spring 15.88 1973 3.22 1958 3.72 04-17-2006
Summer 19.41 1993 5.68 1988 9.12 08-22-2002
Fall 17.74 1961 3.38 1987 5.25 09-14-1961

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 8.1 3.6 0.7 0.1
Feb 6.6 3.6 0.8 0.1
Mar 8.7 4.7 1.4 0.3
Apr 10.0 6.4 2.4 0.6
May 11.1 7.0 2.9 0.9
Jun 10.3 7.2 3.4 1.3
Jul 9.2 6.1 2.5 0.9
Aug 10.3 6.2 3.1 1.2
Sep 8.7 5.7 2.3 1.0
Oct 8.3 5.0 1.7 0.6
Nov 8.9 5.0 1.8 0.6
Dec 9.0 4.5 1.0 0.3
         
Annual 109.5 65.2 23.8 8.0
Winter 23.7 11.8 2.4 0.5
Spring 29.9 18.1 6.7 1.8
Summer 29.9 19.5 8.9 3.4
Fall 26.0 15.7 5.8 2.3

Temperature Summary

Station 113262 FREEPORT WASTE WTR PL, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 25.4 31.2 43.2 56.8 69.1 78.4 82.0 79.7 72.6 60.8 44.4 30.5 56.2
Low °F 9.0 14.1 25.3 36.3 47.5 57.3 61.7 59.1 50.1 38.5 27.8 15.5 36.9
Mean °F 17.2 22.7 34.3 46.6 58.3 67.9 71.9 69.4 61.4 49.7 36.1 23.0 46.5
HDD 1483 1187 953 554 252 40 7 41 152 478 867 1303 7317
CDD 0 0 0 1 44 126 219 177 42 2 0 0 611

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

Temperature Extremes

Period of Record: 1973-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 32.3 2006 4.1 1977 61 01-28-2002 -27 01-20-1985
Feb 35.6 1998 11.4 1979 65 02-28-1976 -27 02-04-1996
Mar 41.9 2000 26.9 1975 85 03-30-1986 -8 03-04-2002
Apr 53.8 1977 41.9 1975 92 04-23-1980 9 04-07-1982
May 66.7 1977 52.4 1997 95 05-27-1985 25 05-03-2005
Jun 74.3 2005 63.5 1982 100 06-21-1988 38 06-01-1993
Jul 76.6 1983 67.5 1992 101 07-15-1977 46 07-06-1979
Aug 76.5 1995 64.2 1992 101 08-17-1988 40 08-28-1986
Sep 67.2 1978 57.0 1993 96 09-09-1978 28 09-23-1974
Oct 55.7 1973 44.4 1988 90 10-04-1997 15 10-30-1988
Nov 47.0 2001 28.9 1995 77 11-01-2000 -5 11-29-1976
Dec 32.5 1982 12.1 1983 67 12-06-2001 -23 12-26-2000
                 
Annual 51.1 1998 44.6 1996 101 07-15-1977 -27 01-20-1985
Winter 29.6 2002 13.1 1977 67 12-06-1901 -27 01-20-1985
Spring 53.9 1977 41.9 1996 95 05-27-1985 -8 03-04-1902
Summer 74.3 1988 65.7 1992 101 07-15-1977 38 06-01-1993
Fall 53.2 1998 44.7 1976 96 09-09-1978 -5 11-29-1976

Temperature Threshold Climatology

Derived from 1973-2000 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 20.7 30.4 9.0
Feb 0.0 13.6 26.3 5.7
Mar 0.0 4.9 24.4 0.7
Apr 0.1 0.3 9.8 0.0
May 0.5 0.0 0.9 0.0
Jun 2.9 0.0 0.0 0.0
Jul 6.2 0.0 0.0 0.0
Aug 3.7 0.0 0.0 0.0
Sep 1.1 0.0 0.7 0.0
Oct 0.0 0.0 9.2 0.0
Nov 0.0 3.5 21.6 0.2
Dec 0.0 14.8 29.2 4.9
         
Annual 14.4 57.7 152.7 20.4
Winter 0.0 49.1 85.9 19.4
Spring 0.6 5.2 35.1 0.7
Summer 12.7 0.0 0.0 0.0
Fall 1.1 3.5 31.5 0.3

Snowfall Summary

Station: 113262 FREEPORT WASTE WTR PL, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 9.8 6.5 4.1 1.6 0.0 0.0 0.0 0.0 0.0 0.0 2.6 7.9 32.5

Snowfall Extremes

Period of Record: 1948-2006

Month High (in) Year 1-Day Max (in) Date
Jan 35.6 1979 9.5 01-14-1979
Feb 19.0 1994 8.0 02-10-1960
Mar 22.0 1965 9.0 03-29-1972
Apr 14.2 1973 9.0 04-10-1973
May 2.0 1966 2.0 05-11-1966
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 2.0 1959 2.0 10-26-1959
Nov 11.0 1995 7.0 11-28-1995
Dec 25.7 2000 9.0 12-28-1966
Season (Jul-Jun) 70.4 1978-1979 9.5 01-14-1979

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 4.1 2.7 1.4 0.2
Feb 4.1 2.7 1.4 0.2
Mar 2.5 1.5 0.7 0.2
Apr 0.8 0.5 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 0.0 0.0 0.0 0.0
Nov 1.5 0.9 0.6 0.1
Dec 5.1 3.0 1.6 0.3
Annual 20.0 12.2 6.4 1.2

Growing Season Summary

Station: 113262 FREEPORT WASTE WTR PL, 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 8 69 256 596 860 1017 937 658 325 78 9 4812
45 0 1 35 153 445 710 862 782 510 203 36 3 3741
50 0 0 16 82 304 560 708 627 366 113 14 1 2790
55 0 0 6 40 186 412 553 473 236 53 4 0 1961
60 0 0 1 18 100 271 399 320 135 19 0 0 1267
50** 1 6 48 158 360 556 683 617 408 202 46 5 3092

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

Length of Growing Season (Days)

Derived from 1973-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 158 138 140 179 186
30 174 139 153 186 202
28 183 150 167 208 216
24 210 178 190 226 233
20 226 209 216 247 267
16 252 218 223 280 285

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