Historical Climate Data

Precipitation Summary

Station: 115751 MOLINE WSO AP, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.58 1.51 2.92 3.82 4.25 4.63 4.03 4.41 3.16 2.80 2.73 2.20 38.04

Precipitation Extremes

Period of Record: 1908-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.39 1974 0.31 1956 1.70 01-03-1971
Feb 3.33 2001 0.17 1933 1.99 02-05-1927
Mar 7.43 1973 0.31 1958 2.16 03-22-1993
Apr 11.30 1973 0.68 1946 4.26 04-21-1973
May 11.43 1974 0.31 1992 3.23 05-13-1970
Jun 13.21 1993 1.02 1963 4.61 06-07-1967
Jul 11.76 1992 0.41 1991 5.08 07-10-1971
Aug 15.23 1987 0.35 1971 4.60 08-29-1951
Sep 14.18 1970 0.02 1979 6.21 09-13-1961
Oct 9.41 1941 0.01 1964 4.77 10-10-1954
Nov 6.77 1992 0.27 2002 2.04 11-10-1995
Dec 4.99 1982 0.23 1929 3.38 12-26-1942
             
Annual 56.36 1973 17.86 2005 6.21 09-13-1961
Winter 9.70 1974 1.54 1931 3.38 12-26-1942
Spring 25.69 1973 3.09 1934 4.26 04-21-1973
Summer 26.79 1993 3.79 1991 5.08 07-10-1971
Fall 20.47 1961 3.30 2002 6.21 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 9.8 4.2 0.7 0.3
Feb 8.0 3.7 0.6 0.2
Mar 10.6 6.1 1.7 0.6
Apr 11.0 6.9 2.6 1.0
May 12.1 7.3 2.8 1.3
Jun 10.6 7.1 3.1 1.3
Jul 10.0 6.4 2.7 0.8
Aug 10.1 6.4 2.7 1.5
Sep 8.1 5.4 2.1 0.8
Oct 8.8 5.3 1.8 0.5
Nov 10.2 5.4 1.8 0.4
Dec 10.0 4.9 1.3 0.4
         
Annual 119.2 69.2 24.0 9.2
Winter 27.8 12.8 2.6 0.9
Spring 33.6 20.3 7.1 3.0
Summer 30.7 19.9 8.5 3.7
Fall 27.1 16.1 5.8 1.7

Temperature Summary

Station 115751 MOLINE WSO AP, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 29.8 35.6 48.3 61.7 73.3 82.7 86.1 83.9 76.5 64.4 48.0 34.5 60.4
Low °F 12.3 18.2 29.0 39.3 50.0 59.7 64.5 62.4 53.4 41.6 30.1 18.3 39.9
Mean °F 21.1 26.9 38.7 50.5 61.7 71.2 75.3 73.2 65.0 53.0 39.1 26.4 50.2
HDD 1374 1083 831 450 172 19 3 8 108 394 782 1191 6415
CDD 0 0 1 12 62 205 322 254 101 12 0 0 969

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

Temperature Extremes

Period of Record: 1905-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 35.3 2006 6.3 1979 69 01-31-1989 -27 01-02-1979
Feb 37.7 1998 13.2 1979 71 02-27-1976 -28 02-03-1996
Mar 48.8 1945 19.9 1960 88 03-29-1986 -19 03-06-1960
Apr 57.1 1985 43.6 1950 93 04-25-1986 7 04-07-1982
May 68.9 1977 54.8 1935 104 05-31-1934 25 05-03-2005
Jun 78.1 1934 66.2 1982 104 06-01-1934 39 06-04-1945
Jul 80.5 1955 70.5 1992 105 07-25-1940 46 07-11-1945
Aug 81.0 1947 67.4 1992 106 08-18-1936 40 08-29-1934
Sep 70.3 1933 59.0 1949 100 09-15-1939 24 09-28-1942
Oct 64.4 1963 46.6 1952 95 10-03-2006 16 10-29-1952
Nov 49.8 2001 30.1 1976 80 11-01-1933 -9 11-29-1976
Dec 35.3 1982 13.2 2000 71 12-04-1998 -24 12-23-1989
                 
Annual 54.0 1937 47.4 1979 106 08-18-1936 -28 02-03-1996
Winter 32.2 2002 14.1 1979 71 12-04-1998 -28 02-03-1996
Spring 56.4 1977 43.9 1960 104 05-31-1934 -19 03-06-1960
Summer 77.3 1983 68.9 1992 106 08-18-1936 39 06-04-1945
Fall 57.5 1963 46.7 1976 100 09-15-1939 -9 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 17.4 29.2 7.3
Feb 0.0 11.3 24.3 4.0
Mar 0.0 3.1 19.9 0.2
Apr 0.1 0.2 7.3 0.0
May 1.2 0.0 0.5 0.0
Jun 5.3 0.0 0.0 0.0
Jul 8.9 0.0 0.0 0.0
Aug 6.0 0.0 0.0 0.0
Sep 2.0 0.0 0.3 0.0
Oct 0.1 0.0 5.9 0.0
Nov 0.0 2.7 18.5 0.2
Dec 0.0 12.1 27.7 3.4
         
Annual 23.5 46.8 133.5 15.1
Winter 0.0 40.8 81.2 14.7
Spring 1.3 3.3 27.7 0.2
Summer 20.2 0.0 0.0 0.0
Fall 2.1 2.7 24.6 0.2

Snowfall Summary

Station: 115751 MOLINE WSO AP, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 10.2 7.2 4.9 1.3 0.0 0.0 0.0 0.0 0.0 0.2 3.0 8.5 35.3

Snowfall Extremes

Period of Record: 1908-2006

Month High (in) Year 1-Day Max (in) Date
Jan 26.7 1979 16.4 01-03-1971
Feb 23.2 1975 9.3 02-18-2000
Mar 19.8 1972 9.8 03-29-1972
Apr 13.0 1982 7.8 04-05-1982
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 6.6 1967 6.5 10-26-1967
Nov 15.6 1974 8.4 11-26-1975
Dec 32.9 2000 9.2 12-15-1987
Season (Jul-Jun) 73.6 1974-1975 16.4 01-03-1971

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 5.3 2.1 1.1 0.2
Feb 5.3 2.1 1.1 0.2
Mar 3.8 1.5 0.8 0.2
Apr 0.9 0.3 0.2 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 0.1 0.1 0.0
Nov 2.8 1.0 0.4 0.1
Dec 6.5 2.6 1.5 0.3
Annual 27.2 10.5 5.2 1.2

Growing Season Summary

Station: 115751 MOLINE WSO AP, 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 5 20 114 337 674 941 1098 1031 751 412 111 16 5515
45 1 7 61 217 520 791 943 876 601 276 57 6 4362
50 0 1 31 123 371 641 788 721 454 167 26 2 3330
55 0 0 14 63 238 491 633 566 314 90 9 1 2424
60 0 0 5 29 134 344 478 412 195 39 2 0 1642
50** 4 13 74 204 416 623 751 697 477 249 63 9 3586

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

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 167 140 150 182 204
30 180 140 159 205 215
28 196 161 173 216 226
24 212 189 193 234 237
20 237 213 215 261 269
16 253 220 233 278 284

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