Collinsville climate — normals and trends

Q: What is the climate of Collinsville?

Collinsville has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 13.2 °C and it receives 1,012 mm of precipitation per year.

Q: What is the hottest day ever recorded in Collinsville?

The hottest day measured in Collinsville between 1940 and 2025 was 14 July 1954, reaching 43.0 °C.

Q: What is the coldest day in Collinsville?

The coldest day measured in Collinsville between 1940 and 2025 was 2 February 1951, at -27.5 °C.

Q: Does it snow in Collinsville?

Yes. Collinsville gets on average 38.2 cm of snow per year and has around 85 frost days.

Q: Has the climate of Collinsville warmed?

Yes: Collinsville warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Collinsville?

The wettest day measured in Collinsville between 1940 and 2025 was 26 April 2017, with 114 mm of rain in 24 hours.

Q: What was the windiest day in Collinsville?

The windiest day measured in Collinsville between 1940 and 2025 was 5 April 1947, with winds reaching 46.1 km/h.

Q: What is the warmest month in Collinsville?

The warmest month in Collinsville is July (25.9 °C on average); the coldest is January (-1.0 °C).

Q: How much does it rain in Collinsville?

Collinsville receives on average 1,012 mm of precipitation per year, spread over about 111 rainy days.

Q: Is it sunny in Collinsville?

Collinsville gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.

Collinsville (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.2 °C and it receives 1,012 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is July (25.9 °C on average) and the coldest is January (-1.0 °C). Rainfall peaks in May.

Collinsville averages 85 frost days, 60 hot days (≥ 30 °C) and 111 rainy days per year.

Collinsville has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.

The number of frost days there went from about 95 to 75 per year over the period.

The hottest day of the period reached 43.0 °C (on 14 July 1954) and the coldest -27.5 °C (on 2 February 1951).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

CollinsvilleIllinois

coords: 38.67°, -89.98°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthJulyColdest monthJanuaryWettest monthMayDriest monthFebruary

Mean daily temperature

13.2°C

Average daily high

18.2°C

Average daily low

8.6°C

Annual rainfall

1,012mm

Sunshine / day

9.0h

Mean relative humidity

67%

Average peak wind

16.9km/h

Seasonal range

26.9°C

Frost days (< 0 °C)

85 d/yr

Hot days (≥ 30 °C)

60 d/yr

Rainy days (≥ 1 mm)

111 d/yr

Annual snowfall

38.2 cm

Average feels-like high

17.0 °C

Average feels-like low

6.5 °C

Average peak gust

36.5 km/h

Tropical nights (≥ 20 °C)

63 d/yr

Solar radiation

15.6 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.4 °C

since 1940

+0.2 °C per decade · r² = 0.25 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

43.0 °C

14 July 1954

Coldest day

-27.5 °C

2 February 1951

Wettest day

114 mm

26 April 2017

Windiest day

46.1 km/h

5 April 1947

Strongest gust

104.0 km/h

10 November 1998

Hottest feels-like

44.7 °C

25 August 2023

Coldest feels-like

-34.6 °C

20 January 1985

Snowiest day

28.1 cm

6 November 1951

Sunniest day

14.0 h

10 July 2023

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.9 °C14 September 2025	-19.3 °C9 January 2025	14.0 °C	1,119 mm	67	80
2024	36.7 °C27 August 2024	-21.1 °C14 January 2024	14.9 °C	1,136 mm	66	55
2023	38.4 °C25 August 2023	-12.6 °C31 January 2023	14.9 °C	994 mm	62	55
2022	37.3 °C5 July 2022	-21.5 °C23 December 2022	13.5 °C	1,121 mm	67	93
2021	36.4 °C18 June 2021	-18.6 °C16 February 2021	14.3 °C	1,047 mm	70	73
2020	36.0 °C11 July 2020	-15.6 °C14 February 2020	13.8 °C	1,276 mm	58	62
2019	34.7 °C19 July 2019	-20.6 °C30 January 2019	13.5 °C	1,282 mm	70	90
2018	34.9 °C15 June 2018	-21.5 °C1 January 2018	13.7 °C	1,256 mm	88	91
2017	38.2 °C22 July 2017	-18.4 °C27 December 2017	14.9 °C	1,127 mm	66	63
2016	36.5 °C23 June 2016	-18.5 °C18 January 2016	14.7 °C	1,149 mm	67	65
2015	35.0 °C13 July 2015	-19.9 °C19 February 2015	14.1 °C	1,428 mm	54	70
2014	35.5 °C25 August 2014	-22.1 °C7 January 2014	12.2 °C	1,034 mm	45	101
2013	39.3 °C31 August 2013	-14.4 °C24 December 2013	12.8 °C	897 mm	55	102
2012	41.1 °C25 July 2012	-10.6 °C14 January 2012	15.6 °C	844 mm	91	65
2011	38.0 °C1 September 2011	-19.0 °C10 February 2011	14.2 °C	1,263 mm	79	70
2010	38.0 °C3 August 2010	-19.2 °C10 January 2010	14.0 °C	932 mm	87	89
2009	35.8 °C23 June 2009	-18.8 °C15 January 2009	13.3 °C	1,312 mm	33	75
2008	35.6 °C20 July 2008	-15.4 °C22 December 2008	12.8 °C	1,408 mm	43	98
2007	38.8 °C15 August 2007	-17.9 °C16 February 2007	14.4 °C	795 mm	77	89
2006	36.7 °C1 August 2006	-15.8 °C4 December 2006	14.4 °C	993 mm	69	62
2005	37.9 °C24 July 2005	-17.6 °C9 December 2005	14.2 °C	922 mm	77	76
2004	36.1 °C13 July 2004	-19.1 °C31 January 2004	13.5 °C	1,070 mm	36	74
2003	37.0 °C21 August 2003	-17.3 °C23 January 2003	13.2 °C	1,028 mm	44	82
2002	37.3 °C3 August 2002	-18.5 °C4 March 2002	13.9 °C	937 mm	81	79
2001	36.1 °C7 July 2001	-16.6 °C2 January 2001	13.9 °C	1,014 mm	56	77
2000	35.5 °C29 August 2000	-22.6 °C25 December 2000	13.2 °C	915 mm	56	87
1999	38.9 °C29 July 1999	-26.3 °C5 January 1999	14.1 °C	889 mm	56	70
1998	36.0 °C6 September 1998	-18.1 °C12 March 1998	14.7 °C	1,205 mm	74	62
1997	38.3 °C26 July 1997	-20.6 °C12 January 1997	12.7 °C	960 mm	47	75
1996	36.2 °C18 July 1996	-24.7 °C3 February 1996	12.4 °C	1,153 mm	50	94
1995	37.9 °C18 August 1995	-16.3 °C9 December 1995	13.5 °C	972 mm	65	89
1994	35.3 °C19 June 1994	-26.4 °C19 January 1994	13.8 °C	983 mm	65	70
1993	35.7 °C27 July 1993	-19.6 °C18 February 1993	12.6 °C	1,284 mm	60	91
1992	36.5 °C2 July 1992	-18.7 °C16 January 1992	13.2 °C	1,030 mm	31	70
1991	38.1 °C2 August 1991	-18.1 °C8 November 1991	14.1 °C	1,050 mm	73	77
1990	37.6 °C6 September 1990	-19.5 °C24 December 1990	14.0 °C	1,338 mm	52	64
1989	37.0 °C10 July 1989	-27.5 °C22 December 1989	12.5 °C	868 mm	51	97
1988	38.2 °C25 June 1988	-22.5 °C12 February 1988	13.2 °C	922 mm	77	88
1987	38.8 °C2 August 1987	-21.1 °C24 January 1987	14.1 °C	921 mm	79	73
1986	37.4 °C25 July 1986	-18.7 °C27 January 1986	13.8 °C	1,062 mm	67	79
1985	35.5 °C13 July 1985	-26.7 °C20 January 1985	12.5 °C	1,283 mm	45	90
1984	37.4 °C29 August 1984	-25.1 °C21 January 1984	12.9 °C	1,315 mm	56	81
1983	39.8 °C23 July 1983	-24.5 °C25 December 1983	12.9 °C	1,157 mm	81	83
1982	35.7 °C4 August 1982	-27.1 °C17 January 1982	12.6 °C	1,283 mm	30	91
1981	35.3 °C13 July 1981	-23.1 °C12 February 1981	13.1 °C	1,061 mm	42	78
1980	40.3 °C15 July 1980	-21.7 °C2 March 1980	12.9 °C	916 mm	78	97
1979	35.1 °C21 June 1979	-27.1 °C15 January 1979	12.0 °C	943 mm	52	102
1978	35.8 °C27 June 1978	-19.9 °C6 February 1978	11.8 °C	1,023 mm	59	97
1977	36.0 °C5 June 1977	-27.5 °C17 January 1977	13.2 °C	1,052 mm	67	81
1976	35.7 °C14 July 1976	-22.2 °C9 January 1976	12.4 °C	636 mm	46	101
1975	36.3 °C12 August 1975	-17.7 °C20 January 1975	13.2 °C	1,035 mm	61	90
1974	36.8 °C28 July 1974	-21.0 °C12 January 1974	13.0 °C	1,086 mm	41	77
1973	35.3 °C26 August 1973	-22.0 °C21 December 1973	13.6 °C	1,209 mm	55	78
1972	35.1 °C18 August 1972	-20.9 °C15 January 1972	12.5 °C	802 mm	63	100
1971	37.2 °C26 June 1971	-17.1 °C9 February 1971	13.4 °C	699 mm	63	91
1970	37.0 °C31 July 1970	-23.7 °C21 January 1970	12.9 °C	819 mm	59	89
1969	36.1 °C4 July 1969	-16.7 °C4 January 1969	12.6 °C	890 mm	59	101
1968	36.2 °C20 August 1968	-21.7 °C7 January 1968	12.8 °C	931 mm	62	93
1967	34.4 °C23 July 1967	-17.3 °C18 January 1967	12.8 °C	1,021 mm	36	86
1966	41.2 °C13 July 1966	-21.6 °C29 January 1966	12.6 °C	867 mm	56	90
1965	36.4 °C24 July 1965	-24.4 °C31 January 1965	13.4 °C	826 mm	47	86
1964	38.3 °C3 August 1964	-21.9 °C14 January 1964	13.4 °C	754 mm	68	89
1963	36.5 °C2 August 1963	-24.4 °C23 January 1963	12.6 °C	748 mm	62	97
1962	38.7 °C20 August 1962	-24.6 °C11 January 1962	12.7 °C	852 mm	62	90
1961	34.9 °C29 July 1961	-21.4 °C27 January 1961	12.6 °C	931 mm	62	83
1960	36.5 °C6 September 1960	-20.8 °C5 March 1960	12.5 °C	697 mm	58	115
1959	35.8 °C29 June 1959	-23.8 °C5 January 1959	13.4 °C	879 mm	79	81
1958	35.6 °C8 June 1958	-21.3 °C17 February 1958	12.4 °C	839 mm	47	95
1957	37.6 °C17 July 1957	-16.9 °C14 January 1957	13.4 °C	1,281 mm	55	77
1956	37.4 °C5 August 1956	-12.9 °C24 January 1956	13.6 °C	796 mm	66	91
1955	36.7 °C9 September 1955	-20.7 °C11 February 1955	13.7 °C	857 mm	69	90
1954	43.0 °C14 July 1954	-14.8 °C12 January 1954	14.3 °C	760 mm	84	84
1953	39.7 °C20 June 1953	-14.6 °C23 December 1953	14.4 °C	665 mm	86	76
1952	39.4 °C27 July 1952	-14.6 °C29 January 1952	13.8 °C	778 mm	88	78
1951	37.0 °C30 August 1951	-27.5 °C2 February 1951	12.3 °C	1,257 mm	50	90
1950	35.4 °C25 June 1950	-18.8 °C18 December 1950	12.3 °C	1,224 mm	28	102
1949	36.4 °C1 July 1949	-16.4 °C30 January 1949	13.5 °C	1,166 mm	47	80
1948	35.7 °C24 August 1948	-23.3 °C28 January 1948	13.0 °C	1,093 mm	60	88
1947	38.5 °C6 August 1947	-16.8 °C4 January 1947	12.8 °C	907 mm	62	103
1946	36.7 °C19 July 1946	-14.2 °C15 February 1946	14.3 °C	1,099 mm	55	61
1945	36.7 °C31 August 1945	-14.9 °C19 December 1945	12.6 °C	1,496 mm	43	87
1944	37.4 °C11 August 1944	-14.9 °C14 December 1944	13.0 °C	808 mm	68	94
1943	39.8 °C26 August 1943	-16.0 °C19 January 1943	12.4 °C	702 mm	69	107
1942	36.9 °C1 August 1942	-22.2 °C10 January 1942	12.3 °C	966 mm	52	98
1941	36.7 °C11 August 1941	-15.9 °C19 February 1941	12.7 °C	860 mm	52	103
1940	37.1 °C3 August 1940	-25.4 °C19 January 1940	11.2 °C	815 mm	38	111

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

19.1 °C

+0.9 °C

Hot days (≥ 30 °C)

67 d/yr

Frost days (< 0 °C)

80 d/yr

-5

Annual rainfall

1119 mm

+107 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	1.8 °C	-1.5 °C	51 mm	-13 mm
Feb	5.5 °C	-0.6 °C	43 mm	-21 mm
Mar	17.5 °C	+5.4 °C	81 mm	-21 mm
Apr	20.2 °C	+1.4 °C	174 mm	+61 mm
May	23.1 °C	-1.0 °C	125 mm	+9 mm
Jun	29.3 °C	+0.2 °C	189 mm	+95 mm
Jul	31.4 °C	+0.6 °C	148 mm	+69 mm
Aug	29.4 °C	-0.6 °C	26 mm	-46 mm
Sep	28.8 °C	+2.4 °C	109 mm	+33 mm
Oct	21.9 °C	+1.8 °C	77 mm	-4 mm
Nov	13.3 °C	+1.4 °C	76 mm	-8 mm
Dec	6.8 °C	+1.2 °C	22 mm	-47 mm

The year's extremes

Hottest day

35.9 °C

14 Sep 2025

Coldest day

-19.3 °C

9 Jan 2025

Wettest day

45.0 mm

23 Sep 2025

Windiest day

38.5 km/h

14 Mar 2025

Strongest gust

94.0 km/h

14 Mar 2025

Hottest feels-like

42.3 °C

29 Jul 2025

Coldest feels-like

-24.7 °C

9 Jan 2025

Snowiest day

14.1 cm

5 Jan 2025

Sunniest day

14.0 h

11 May 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Collinsville?

Collinsville has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 13.2 °C and it receives 1,012 mm of precipitation per year.

What is the hottest day ever recorded in Collinsville?

The hottest day measured in Collinsville between 1940 and 2025 was 14 July 1954, reaching 43.0 °C.

What is the coldest day in Collinsville?

The coldest day measured in Collinsville between 1940 and 2025 was 2 February 1951, at -27.5 °C.

Does it snow in Collinsville?

Yes. Collinsville gets on average 38.2 cm of snow per year and has around 85 frost days.

Has the climate of Collinsville warmed?

Yes: Collinsville warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Collinsville?

The wettest day measured in Collinsville between 1940 and 2025 was 26 April 2017, with 114 mm of rain in 24 hours.

What was the windiest day in Collinsville?

The windiest day measured in Collinsville between 1940 and 2025 was 5 April 1947, with winds reaching 46.1 km/h.

What is the warmest month in Collinsville?

The warmest month in Collinsville is July (25.9 °C on average); the coldest is January (-1.0 °C).

How much does it rain in Collinsville?

Collinsville receives on average 1,012 mm of precipitation per year, spread over about 111 rainy days.

Is it sunny in Collinsville?

Collinsville gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.

What is the biggest single-day snowfall in Collinsville?

The heaviest 24-hour snowfall measured in Collinsville between 1940 and 2025 was 6 November 1951, with 28.1 cm.

Are there tropical nights in Collinsville?

Yes: Collinsville has on average 63 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Collinsville?

In Collinsville, between 1940 and 2025, the highest apparent temperature reached 44.7 °C on 25 August 2023, and the lowest was -34.6 °C on 20 January 1985.

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