Historical Climate Data

Precipitation Summary

Station: 114013 HENNEPIN WATER TRTMT, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.14 1.15 2.15 3.24 3.62 4.20 3.78 4.32 3.62 2.71 2.48 2.04 34.45

Precipitation Extremes

Period of Record: 1962-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.48 1965 0.00 1984 1.92 01-30-2001
Feb 3.16 2001 0.00 1987 1.44 02-15-1989
Mar 5.12 1976 0.02 1997 1.82 03-07-1973
Apr 7.02 1965 0.04 1997 2.27 04-14-1981
May 9.57 1974 0.35 1979 3.27 05-17-1974
Jun 8.64 1990 0.83 2005 2.67 06-14-1975
Jul 10.90 1982 0.08 1991 3.42 07-13-1982
Aug 11.90 1979 0.25 1971 5.32 08-18-1979
Sep 10.44 1970 0.01 1979 3.20 09-06-1989
Oct 9.92 1995 0.11 1964 6.07 10-20-1995
Nov 6.79 1994 0.00 1976 2.81 11-09-1966
Dec 5.21 1973 0.18 1962 3.02 12-03-1982
             
Annual 49.74 1970 20.82 2005 6.07 10-20-1995
Winter 10.85 1974 0.54 1996 3.02 12-03-1982
Spring 16.25 1973 2.58 1997 3.27 05-17-1974
Summer 22.93 1990 3.86 1991 5.32 08-18-1979
Fall 15.81 1970 3.04 1979 6.07 10-20-1995

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 4.0 2.5 0.9 0.2
Feb 3.9 2.9 0.8 0.1
Mar 6.1 4.5 1.5 0.5
Apr 8.3 5.8 2.3 0.9
May 9.4 6.6 2.5 0.9
Jun 9.5 7.1 3.1 1.1
Jul 8.3 6.3 2.4 1.0
Aug 8.6 5.9 2.9 1.3
Sep 8.1 5.6 2.7 1.1
Oct 7.0 4.9 1.9 0.7
Nov 6.2 4.7 2.0 0.6
Dec 5.1 3.9 1.5 0.7
         
Annual 86.4 62.0 25.1 9.5
Winter 13.0 9.4 3.2 1.0
Spring 24.2 17.1 6.3 2.4
Summer 26.4 19.3 8.3 3.4
Fall 21.4 15.2 6.6 2.4

Temperature Summary

Station 114013 HENNEPIN WATER TRTMT, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 30.3 36.0 48.3 61.6 73.4 82.7 86.2 84.0 77.4 65.1 49.0 35.6 60.8
Low °F 13.2 18.5 29.5 39.2 49.8 59.4 63.7 61.8 53.2 41.3 30.8 19.4 40.0
Mean °F 21.8 27.3 38.9 50.4 61.6 71.1 75.0 72.9 65.3 53.2 39.9 27.5 50.4
HDD 1340 1058 808 442 180 14 4 18 83 374 753 1163 6237
CDD 0 0 0 4 75 196 312 262 91 8 0 0 948

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

Temperature Extremes

Period of Record: 1962-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 35.4 2006 6.9 1977 66 01-24-1967 -30 01-05-1999
Feb 38.6 1998 13.3 1979 72 02-28-1976 -21 02-03-1985
Mar 46.5 1973 29.4 1965 86 03-30-1986 -8 03-05-1978
Apr 55.5 1977 44.7 1982 93 04-26-1986 9 04-07-1982
May 68.4 1977 56.5 1983 96 05-30-2006 24 05-10-1966
Jun 75.3 2005 66.0 1982 104 06-26-1988 34 06-11-1972
Jul 78.6 1983 68.3 1992 104 07-23-1983 43 07-31-1971
Aug 79.4 1995 65.2 1992 104 08-02-1988 40 08-29-1965
Sep 70.6 2005 58.7 1993 99 09-02-2000 28 09-23-1974
Oct 63.4 1963 45.9 1987 93 10-05-2005 15 10-30-1988
Nov 49.3 2001 31.6 1976 82 11-02-2000 -4 11-26-1977
Dec 35.6 1965 12.1 1983 70 12-03-1970 -25 12-25-1983
                 
Annual 54.3 1998 46.8 1977 104 06-26-1988 -30 01-05-1999
Winter 32.4 1998 15.0 1979 72 02-28-1976 -30 01-05-1999
Spring 55.6 1977 45.9 1984 96 05-30-1906 -8 03-05-1978
Summer 76.4 1995 66.8 1992 104 06-26-1988 34 06-11-1972
Fall 58.1 1963 46.9 1976 99 09-02-1900 -4 11-26-1977

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 16.1 30.0 7.5
Feb 0.0 10.7 26.0 4.2
Mar 0.0 3.2 21.4 0.3
Apr 0.1 0.2 8.9 0.0
May 1.7 0.0 1.1 0.0
Jun 5.6 0.0 0.0 0.0
Jul 9.3 0.0 0.0 0.0
Aug 6.4 0.0 0.0 0.0
Sep 2.7 0.0 0.6 0.0
Oct 0.0 0.0 8.2 0.0
Nov 0.0 1.7 20.0 0.1
Dec 0.0 10.4 28.6 3.9
         
Annual 25.2 43.3 146.9 16.2
Winter 0.0 37.2 84.6 15.5
Spring 1.8 3.4 31.7 0.3
Summer 21.2 0.0 0.0 0.0
Fall 2.6 1.7 29.0 0.1

Snowfall Summary

Station: 114013 HENNEPIN WATER TRTMT, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 5.7 2.8 1.6 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.9 4.8 16.0

Snowfall Extremes

Period of Record: 1962-2006

Month High (in) Year 1-Day Max (in) Date
Jan 20.0 1999 14.0 01-02-1999
Feb 14.0 1980 6.5 02-15-2003
Mar 14.0 1982 12.0 03-04-1982
Apr 9.7 1970 7.5 04-01-1970
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 1.2 1972 1.2 10-18-1972
Nov 7.5 1975 7.5 11-27-1975
Dec 14.0 2006 14.0 12-01-2006
Season (Jul-Jun) 34.0 1978-1979 14.0 12-01-2006

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 1.7 1.2 0.7 0.0
Feb 1.7 1.2 0.7 0.0
Mar 0.6 0.4 0.2 0.1
Apr 0.1 0.1 0.0 0.0
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 0.0 0.0
Nov 0.4 0.3 0.1 0.1
Dec 2.0 1.6 1.1 0.3
Annual 6.3 4.7 2.8 0.7

Growing Season Summary

Station: 114013 HENNEPIN WATER TRTMT, 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 4 17 110 322 653 911 1048 983 738 396 107 17 5237
45 1 5 60 207 501 762 894 831 590 264 54 6 4118
50 0 1 31 118 355 612 740 679 444 157 24 2 3119
55 0 0 13 59 226 463 587 527 305 82 8 0 2240
60 0 0 5 27 126 319 433 376 188 35 1 0 1490
50** 3 14 75 203 409 597 703 655 474 257 68 11 3425

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

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 154 124 133 181 200
30 168 137 142 188 205
28 184 150 164 205 215
24 204 175 179 235 248
20 225 203 204 252 255
16 248 220 230 273 284

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