Historical Climate Data

Precipitation Summary

Station: 116159 NEWTON 6 SSE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.38 2.38 3.85 3.90 4.39 3.74 4.37 3.43 3.17 2.77 3.99 2.90 41.27

Precipitation Extremes

Period of Record: 1911-2003


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 10.31 1950 0.01 1986 3.00 01-22-1999
Feb 5.88 1928 0.10 1947 2.75 02-23-1975
Mar 8.70 1945 0.58 1941 3.09 03-25-1935
Apr 8.12 1972 0.60 1915 2.83 04-29-1996
May 13.46 1943 0.28 1914 5.16 05-13-2002
Jun 9.68 1942 0.65 1984 3.46 06-17-2000
Jul 11.28 1979 0.24 1917 4.15 07-13-1956
Aug 10.74 1972 0.03 1943 4.69 08-03-1972
Sep 7.96 1930 0.08 1917 4.40 09-15-1930
Oct 7.81 2001 0.19 1952 3.26 10-16-1928
Nov 12.59 1985 0.25 1999 3.86 11-14-1993
Dec 9.44 1967 0.38 1976 4.56 12-21-1967
             
Annual 54.76 1927 20.81 1970 5.16 05-13-2002
Winter 15.34 1930 2.86 1963 4.56 12-21-1967
Spring 23.13 1927 3.96 1916 5.16 05-13-2002
Summer 19.08 2000 3.61 1933 4.69 08-03-1972
Fall 18.20 1993 1.97 1999 4.40 09-15-1930

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 8.8 5.2 1.5 0.3
Feb 7.6 4.7 1.4 0.5
Mar 10.5 7.2 2.8 0.8
Apr 11.5 7.8 2.5 0.8
May 10.8 7.6 3.1 1.1
Jun 10.1 6.9 2.5 0.8
Jul 8.7 6.5 2.9 1.4
Aug 8.1 5.3 2.3 1.0
Sep 7.3 5.0 2.1 1.1
Oct 8.1 5.0 2.0 0.6
Nov 10.0 6.4 2.8 1.0
Dec 9.6 5.6 2.2 0.6
         
Annual 111.0 73.3 28.3 10.0
Winter 26.0 15.6 5.2 1.4
Spring 32.7 22.6 8.5 2.7
Summer 26.9 18.7 7.7 3.2
Fall 25.3 16.5 6.9 2.7

Temperature Summary

Station 116159 NEWTON 6 SSE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 34.3 40.2 51.3 62.7 73.2 82.1 85.4 83.5 77.7 66.3 51.9 39.3 62.3
Low °F 18.5 22.4 32.5 41.9 52.2 61.9 66.0 63.1 55.0 43.3 34.1 23.8 42.9
Mean °F 26.4 31.3 41.9 52.3 62.7 72.0 75.7 73.3 66.4 54.8 43.0 31.6 52.6
HDD 1196 943 716 386 160 13 0 10 68 335 659 1038 5524
CDD 0 0 0 5 88 224 332 268 108 18 0 0 1043

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

Temperature Extremes

Period of Record: 1948-2003


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 38.4 1990 10.3 1977 72 01-25-1950 -28 01-19-1994
Feb 43.5 1954 17.2 1978 77 02-29-1972 -21 02-10-1982
Mar 49.2 1973 29.2 1960 83 03-31-1986 -12 03-05-1978
Apr 61.9 1954 47.8 1983 88 04-25-1954 21 04-14-1950
May 73.2 1962 57.1 1989 96 05-26-1953 29 05-10-1966
Jun 80.2 1953 67.7 1974 106 06-26-1954 39 06-01-1966
Jul 82.7 1954 71.2 2000 112 07-14-1954 46 07-14-1950
Aug 79.6 1983 69.4 1992 104 08-05-1965 39 08-29-1986
Sep 73.8 1960 61.7 1974 105 09-02-1953 31 09-30-1949
Oct 65.5 1963 47.9 1988 97 10-02-1953 19 10-26-1962
Nov 49.5 2001 35.3 1976 83 11-01-1950 0 11-25-1950
Dec 41.1 1965 18.8 2000 73 12-03-1982 -19 12-22-1989
                 
Annual 62.0 1949 50.5 1979 112 07-14-1954 -28 01-19-1994
Winter 37.7 1953 20.8 1978 77 02-29-1972 -28 01-19-1994
Spring 58.0 1977 48.5 1984 96 05-26-1953 -12 03-05-1978
Summer 80.2 1954 71.3 2000 112 07-14-1954 39 06-01-1966
Fall 61.1 1963 49.4 1976 105 09-02-1953 0 11-25-1950

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 13.1 27.3 3.2
Feb 0.0 7.6 21.7 2.0
Mar 0.0 1.8 16.1 0.2
Apr 0.0 0.0 4.7 0.0
May 0.7 0.0 0.2 0.0
Jun 5.5 0.0 0.0 0.0
Jul 9.9 0.0 0.0 0.0
Aug 7.3 0.0 0.0 0.0
Sep 2.7 0.0 0.1 0.0
Oct 0.1 0.0 4.6 0.0
Nov 0.0 0.8 14.3 0.0
Dec 0.0 7.4 24.6 1.7
         
Annual 26.3 30.7 113.6 7.0
Winter 0.0 28.0 73.6 6.9
Spring 0.7 1.8 21.0 0.2
Summer 22.7 0.0 0.0 0.0
Fall 2.8 0.8 19.0 0.0

Snowfall Summary

Station: 116159 NEWTON 6 SSE, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 5.0 3.1 2.3 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.9 3.7 15.2

Snowfall Extremes

Period of Record: 1911-2003

Month High (in) Year 1-Day Max (in) Date
Jan 16.6 1977 8.0 01-12-1964
Feb 15.6 1912 9.5 02-21-1912
Mar 16.2 1912 10.0 03-24-1990
Apr 2.0 1957 1.5 04-12-1957
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 2.5 1989 2.5 10-20-1989
Nov 7.0 1958 7.0 11-28-1958
Dec 16.1 1973 10.0 12-20-1973
Season (Jul-Jun) 34.2 1977-1978 10.0 12-20-1973

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 2.1 1.1 0.6 0.2
Feb 2.1 1.1 0.6 0.2
Mar 1.1 0.8 0.6 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 0.2 0.0
Dec 2.4 1.3 0.6 0.1
Annual 9.5 5.8 2.9 0.5

Growing Season Summary

Station: 116159 NEWTON 6 SSE, 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 21 49 176 396 721 977 1124 1050 806 480 186 46 6039
45 9 20 101 268 567 827 969 895 656 339 108 20 4785
50 2 6 53 161 415 677 814 740 508 217 56 8 3663
55 0 1 23 85 274 528 659 585 363 122 25 3 2675
60 0 0 8 38 157 380 504 430 235 56 7 0 1820
50** 12 30 105 231 447 658 773 711 524 302 106 25 3930

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

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 183 135 159 206 215
30 199 169 177 217 226
28 211 182 193 231 250
24 234 202 207 261 271
20 259 228 239 286 293
16 285 228 263 308 340

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