Historical Climate Data

Precipitation Summary

Station: 117072 QUINCY REGIONAL AP, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.36 1.84 3.04 3.79 4.86 3.61 3.84 3.44 3.85 3.21 3.23 2.37 38.44

Precipitation Extremes

Period of Record: 1948-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 6.10 1965 0.10 1986 3.38 01-01-1965
Feb 5.15 1997 0.21 2006 1.91 02-20-1997
Mar 11.45 1973 0.45 1958 2.27 03-28-1977
Apr 7.76 1970 0.99 2000 2.86 04-21-1973
May 13.26 1991 0.45 1992 2.75 05-27-1973
Jun 8.45 1973 0.40 1963 5.84 06-14-1950
Jul 13.21 1981 0.10 1988 4.62 07-22-1951
Aug 10.84 1970 0.27 1992 5.60 08-25-2004
Sep 10.84 1970 0.33 1956 4.12 09-13-1961
Oct 10.84 1969 0.17 1950 4.46 10-12-1969
Nov 11.17 1985 0.29 1959 3.47 11-18-1985
Dec 8.62 1982 0.15 1955 4.60 12-02-1982
             
Annual 66.60 1973 20.00 1953 5.84 06-14-1950
Winter 10.11 1983 1.36 1963 4.60 12-02-1982
Spring 25.78 1973 4.20 1956 2.86 04-21-1973
Summer 20.06 1981 3.72 1983 5.84 06-14-1950
Fall 21.55 1977 2.39 1956 4.46 10-12-1969

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 8.2 3.4 0.6 0.2
Feb 8.3 3.8 1.0 0.4
Mar 10.9 6.4 2.1 0.6
Apr 10.9 6.9 2.6 0.7
May 11.8 7.8 3.4 1.7
Jun 9.6 6.1 2.6 0.8
Jul 8.9 6.0 2.6 0.9
Aug 8.8 5.6 2.2 1.0
Sep 8.2 5.6 2.5 1.3
Oct 8.7 5.5 2.0 0.8
Nov 9.7 5.8 2.3 0.8
Dec 9.2 4.5 1.2 0.6
         
Annual 113.0 67.2 25.1 9.8
Winter 25.7 11.6 2.8 1.3
Spring 33.6 21.1 8.2 3.0
Summer 27.3 17.8 7.4 2.7
Fall 26.5 16.9 6.7 2.8

Temperature Summary

Station 117072 QUINCY REGIONAL AP, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 32.7 38.7 50.9 63.1 72.8 81.8 86.0 84.0 77.1 65.5 50.2 37.2 61.7
Low °F 16.7 22.0 32.3 42.8 53.0 62.2 66.6 64.3 55.9 44.6 33.2 21.9 43.0
Mean °F 24.7 30.4 41.6 53.0 62.9 72.0 76.3 74.2 66.5 55.1 41.7 29.6 52.3
HDD 1249 971 724 370 150 13 1 13 74 318 700 1098 5681
CDD 0 0 0 8 84 223 353 297 119 10 0 0 1094

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

Temperature Extremes

Period of Record: 1948-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 38.4 2006 11.2 1977 73 01-24-1950 -21 01-10-1982
Feb 39.5 2000 16.4 1978 76 02-29-1972 -18 02-03-1996
Mar 47.7 1973 24.8 1960 85 03-29-1986 -13 03-05-1960
Apr 58.9 1955 45.6 1950 92 04-25-1986 16 04-12-1957
May 71.2 1962 57.2 1954 93 05-12-1956 28 05-10-1966
Jun 77.1 1953 66.4 1982 101 06-25-1954 42 06-04-1950
Jul 83.5 1980 71.4 1950 112 07-14-1954 47 07-14-1950
Aug 81.8 1983 68.4 1950 103 08-29-1984 42 08-20-1950
Sep 72.0 1978 60.0 1949 100 09-01-1953 32 09-29-1984
Oct 66.9 1963 49.5 1976 93 10-02-1953 18 10-29-1952
Nov 50.7 2001 34.3 1950 81 11-01-1950 -11 11-30-1964
Dec 38.8 1965 15.8 2000 71 12-03-1970 -22 12-22-1989
                 
Annual 55.0 1998 50.0 1950 112 07-14-1954 -22 12-22-1989
Winter 35.1 2002 19.4 1978 76 02-29-1972 -22 12-22-1989
Spring 57.9 1977 46.5 1960 93 05-12-1956 -13 03-05-1960
Summer 78.8 1980 69.8 1950 112 07-14-1954 42 06-04-1950
Fall 60.2 1963 49.7 1976 100 09-01-1953 -11 11-30-1964

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 15.1 28.3 4.3
Feb 0.0 9.2 21.9 2.5
Mar 0.0 2.4 16.2 0.2
Apr 0.1 0.1 3.8 0.0
May 0.3 0.0 0.1 0.0
Jun 4.5 0.0 0.0 0.0
Jul 10.1 0.0 0.0 0.0
Aug 7.0 0.0 0.0 0.0
Sep 2.5 0.0 0.0 0.0
Oct 0.0 0.0 3.0 0.0
Nov 0.0 2.1 14.9 0.0
Dec 0.0 10.4 26.0 2.0
         
Annual 25.0 39.2 113.2 9.0
Winter 0.0 34.8 76.2 8.8
Spring 0.4 2.5 19.7 0.2
Summer 21.6 0.0 0.0 0.0
Fall 2.5 2.1 17.9 0.0

Snowfall Summary

Station: 117072 QUINCY REGIONAL AP, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 7.6 6.0 2.8 0.8 0.0 0.0 0.0 0.0 0.0 0.0 2.3 4.9 24.4

Snowfall Extremes

Period of Record: 1948-2006

Month High (in) Year 1-Day Max (in) Date
Jan 22.2 1987 10.0 01-20-1959
Feb 20.8 1993 10.9 02-25-1993
Mar 24.4 1960 8.0 03-04-1964
Apr 4.4 1980 4.0 04-17-1953
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 0.3 1993 0.3 10-30-1993
Nov 8.9 1974 7.9 11-26-1975
Dec 16.7 1973 6.4 12-31-1978
Season (Jul-Jun) 45.2 1977-1978 10.9 02-25-1993

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 4.3 2.1 1.1 0.2
Feb 4.3 2.1 1.1 0.2
Mar 2.1 1.0 0.5 0.1
Apr 0.6 0.3 0.1 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 0.0 0.0 0.0 0.0
Nov 1.7 0.7 0.4 0.1
Dec 3.7 1.9 0.8 0.2
Annual 17.5 8.4 4.2 1.0

Growing Season Summary

Station: 117072 QUINCY REGIONAL 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 13 42 160 401 718 971 1139 1070 803 477 156 30 5979
45 3 17 90 273 563 821 984 915 653 334 87 12 4757
50 1 5 48 166 411 671 829 760 505 211 43 5 3662
55 0 1 23 89 271 522 674 605 363 118 18 1 2691
60 0 0 8 40 154 374 519 450 236 55 5 0 1849
50** 8 24 93 227 438 655 785 731 515 276 85 17 3856

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

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 191 166 171 216 232
30 205 170 181 224 237
28 210 190 191 228 246
24 227 194 216 253 281
20 254 220 226 281 299
16 272 228 249 306 340

Back to the Station List

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