West Chester climate — normals and trends

Q: What is the climate of West Chester?

West Chester has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.3 °C and it receives 1,148 mm of precipitation per year.

Q: What is the hottest day ever recorded in West Chester?

The hottest day measured in West Chester between 1940 and 2025 was 22 July 2011, reaching 40.1 °C.

Q: What is the coldest day in West Chester?

The coldest day measured in West Chester between 1940 and 2025 was 22 January 1984, at -24.7 °C.

Q: Does it snow in West Chester?

Yes. West Chester gets on average 56.7 cm of snow per year and has around 82 frost days.

Q: Has the climate of West Chester warmed?

Yes: West Chester warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in West Chester?

The wettest day measured in West Chester between 1940 and 2025 was 16 September 1999, with 136 mm of rain in 24 hours.

Q: What was the windiest day in West Chester?

The windiest day measured in West Chester between 1940 and 2025 was 15 October 1954, with winds reaching 51.4 km/h.

Q: What is the warmest month in West Chester?

The warmest month in West Chester is July (24.5 °C on average); the coldest is January (0.0 °C).

Q: How much does it rain in West Chester?

West Chester receives on average 1,148 mm of precipitation per year, spread over about 121 rainy days.

Q: Is it sunny in West Chester?

West Chester gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

West Chester (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.3 °C and it receives 1,148 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 (24.5 °C on average) and the coldest is January (0.0 °C). Rainfall peaks in July.

West Chester averages 82 frost days, 35 hot days (≥ 30 °C) and 121 rainy days per year.

West Chester has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.

The number of frost days there went from about 91 to 73 per year over the period.

The hottest day of the period reached 40.1 °C (on 22 July 2011) and the coldest -24.7 °C (on 22 January 1984).

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

West ChesterPennsylvania

coords: 39.96°, -75.61°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthFebruary

Mean daily temperature

12.3°C

Average daily high

17.0°C

Average daily low

8.1°C

Annual rainfall

1,148mm

Sunshine / day

8.9h

Mean relative humidity

68%

Average peak wind

16.4km/h

Seasonal range

24.5°C

Frost days (< 0 °C)

82 d/yr

Hot days (≥ 30 °C)

35 d/yr

Rainy days (≥ 1 mm)

121 d/yr

Annual snowfall

56.7 cm

Average feels-like high

15.6 °C

Average feels-like low

5.7 °C

Average peak gust

38.0 km/h

Tropical nights (≥ 20 °C)

44 d/yr

Solar radiation

14.7 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.7 °C

since 1940

+0.2 °C per decade · r² = 0.40 · 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

40.1 °C

22 July 2011

Coldest day

-24.7 °C

22 January 1984

Wettest day

136 mm

16 September 1999

Windiest day

51.4 km/h

15 October 1954

Strongest gust

124.6 km/h

25 November 1950

Hottest feels-like

45.2 °C

15 July 1995

Coldest feels-like

-30.0 °C

22 January 1984

Snowiest day

38.3 cm

20 March 1958

Sunniest day

14.2 h

19 June 2022

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	37.5 °C24 June 2025	-13.3 °C23 January 2025	13.0 °C	1,030 mm	38	84
2024	36.1 °C16 July 2024	-13.3 °C23 December 2024	13.9 °C	1,168 mm	44	60
2023	35.7 °C6 September 2023	-11.3 °C4 February 2023	14.1 °C	1,166 mm	37	40
2022	35.1 °C9 August 2022	-14.6 °C24 December 2022	13.3 °C	1,298 mm	49	90
2021	35.3 °C30 June 2021	-10.0 °C8 February 2021	13.7 °C	1,144 mm	47	70
2020	36.1 °C3 July 2020	-12.5 °C19 December 2020	13.9 °C	1,318 mm	45	55
2019	36.6 °C21 July 2019	-15.9 °C31 January 2019	13.3 °C	1,290 mm	45	80
2018	35.0 °C2 July 2018	-16.6 °C7 January 2018	13.2 °C	1,646 mm	46	72
2017	35.9 °C13 June 2017	-13.2 °C9 January 2017	13.7 °C	1,120 mm	37	60
2016	35.9 °C23 July 2016	-14.3 °C14 February 2016	13.7 °C	959 mm	55	70
2015	34.7 °C3 September 2015	-17.2 °C20 February 2015	13.2 °C	1,011 mm	44	82
2014	33.5 °C18 June 2014	-18.4 °C23 January 2014	11.7 °C	1,124 mm	24	91
2013	35.8 °C18 July 2013	-12.3 °C23 January 2013	12.6 °C	1,050 mm	30	86
2012	39.0 °C18 July 2012	-11.3 °C4 January 2012	14.1 °C	961 mm	50	59
2011	40.1 °C22 July 2011	-13.8 °C24 January 2011	13.5 °C	1,522 mm	41	82
2010	39.3 °C6 July 2010	-10.6 °C7 February 2010	13.6 °C	1,046 mm	72	81
2009	33.6 °C10 August 2009	-14.6 °C17 January 2009	12.2 °C	1,291 mm	17	84
2008	36.9 °C10 June 2008	-12.2 °C11 February 2008	12.8 °C	1,177 mm	40	80
2007	36.0 °C8 August 2007	-13.4 °C5 February 2007	13.0 °C	1,059 mm	49	83
2006	35.9 °C3 August 2006	-11.0 °C19 February 2006	13.6 °C	1,273 mm	41	59
2005	36.0 °C27 July 2005	-17.0 °C29 January 2005	12.7 °C	1,014 mm	47	79
2004	33.2 °C9 June 2004	-16.2 °C10 January 2004	12.4 °C	1,218 mm	19	83
2003	34.9 °C5 July 2003	-14.7 °C18 January 2003	11.8 °C	1,425 mm	27	91
2002	36.8 °C4 July 2002	-9.7 °C7 December 2002	13.2 °C	1,109 mm	50	71
2001	38.5 °C9 August 2001	-16.3 °C23 January 2001	13.1 °C	831 mm	33	78
2000	34.7 °C11 June 2000	-14.0 °C18 January 2000	12.0 °C	1,037 mm	17	88
1999	37.0 °C5 July 1999	-11.3 °C6 January 1999	13.1 °C	1,108 mm	45	73
1998	35.3 °C22 July 1998	-12.9 °C1 January 1998	13.8 °C	1,013 mm	39	50
1997	35.9 °C17 July 1997	-16.1 °C19 January 1997	12.2 °C	958 mm	39	74
1996	34.7 °C20 May 1996	-18.2 °C5 February 1996	11.6 °C	1,499 mm	11	81
1995	38.4 °C15 July 1995	-15.8 °C6 February 1995	12.5 °C	1,034 mm	45	91
1994	36.8 °C19 June 1994	-22.0 °C19 January 1994	12.6 °C	1,224 mm	40	83
1993	36.4 °C10 July 1993	-15.0 °C7 February 1993	12.4 °C	1,228 mm	48	81
1992	36.1 °C14 July 1992	-12.5 °C19 January 1992	11.8 °C	1,025 mm	21	80
1991	37.4 °C23 July 1991	-12.7 °C22 January 1991	13.5 °C	1,063 mm	59	78
1990	36.5 °C4 July 1990	-12.6 °C26 February 1990	13.5 °C	1,115 mm	32	60
1989	33.7 °C27 June 1989	-14.8 °C23 December 1989	11.8 °C	1,383 mm	26	96
1988	36.5 °C10 July 1988	-17.9 °C11 January 1988	11.9 °C	981 mm	55	88
1987	35.6 °C21 July 1987	-19.0 °C28 January 1987	12.3 °C	1,217 mm	38	80
1986	36.2 °C7 July 1986	-13.7 °C28 January 1986	12.3 °C	1,145 mm	36	85
1985	34.2 °C14 August 1985	-22.7 °C21 January 1985	12.3 °C	998 mm	13	89
1984	34.9 °C9 June 1984	-24.7 °C22 January 1984	12.0 °C	1,333 mm	28	79
1983	36.4 °C16 July 1983	-18.2 °C25 December 1983	12.3 °C	1,540 mm	52	69
1982	34.0 °C19 July 1982	-21.1 °C17 January 1982	11.7 °C	1,053 mm	14	89
1981	34.0 °C9 July 1981	-21.6 °C13 January 1981	11.7 °C	977 mm	24	87
1980	37.2 °C16 July 1980	-16.3 °C25 December 1980	11.9 °C	868 mm	53	93
1979	34.1 °C10 August 1979	-22.2 °C18 February 1979	12.0 °C	1,323 mm	24	77
1978	35.3 °C22 July 1978	-17.3 °C20 February 1978	11.0 °C	1,401 mm	26	94
1977	36.1 °C19 July 1977	-20.3 °C17 January 1977	12.0 °C	1,234 mm	38	89
1976	32.7 °C18 April 1976	-16.1 °C23 January 1976	11.6 °C	1,065 mm	27	93
1975	34.9 °C2 August 1975	-10.6 °C21 January 1975	12.6 °C	1,381 mm	24	81
1974	34.7 °C10 July 1974	-11.4 °C5 February 1974	12.4 °C	1,046 mm	27	82
1973	35.8 °C28 August 1973	-14.5 °C17 February 1973	12.8 °C	1,339 mm	32	66
1972	34.9 °C23 July 1972	-15.5 °C16 January 1972	11.7 °C	1,451 mm	27	89
1971	35.8 °C8 July 1971	-15.8 °C1 February 1971	12.4 °C	1,309 mm	29	76
1970	33.7 °C23 September 1970	-16.8 °C9 January 1970	12.0 °C	1,030 mm	42	86
1969	35.6 °C17 July 1969	-12.1 °C25 December 1969	11.8 °C	1,248 mm	25	104
1968	37.2 °C1 July 1968	-18.9 °C2 January 1968	12.0 °C	960 mm	42	90
1967	34.0 °C16 June 1967	-20.4 °C13 February 1967	11.2 °C	1,122 mm	20	89
1966	39.8 °C3 July 1966	-16.4 °C29 January 1966	11.6 °C	978 mm	46	92
1965	34.0 °C23 June 1965	-17.6 °C15 January 1965	11.5 °C	744 mm	35	91
1964	36.1 °C30 June 1964	-16.4 °C15 January 1964	11.9 °C	1,016 mm	38	90
1963	35.7 °C27 June 1963	-19.6 °C29 January 1963	11.2 °C	974 mm	25	94
1962	34.9 °C19 May 1962	-19.1 °C11 February 1962	11.2 °C	1,034 mm	29	105
1961	33.5 °C13 June 1961	-20.6 °C2 February 1961	11.7 °C	1,180 mm	33	86
1960	32.8 °C30 August 1960	-18.7 °C23 December 1960	11.5 °C	1,211 mm	21	105
1959	36.9 °C29 June 1959	-13.5 °C23 December 1959	12.8 °C	1,063 mm	54	90
1958	33.5 °C2 July 1958	-15.7 °C17 February 1958	11.2 °C	1,304 mm	27	85
1957	37.2 °C21 July 1957	-16.7 °C17 January 1957	12.5 °C	977 mm	40	75
1956	36.2 °C2 July 1956	-10.5 °C28 January 1956	11.9 °C	1,206 mm	30	74
1955	37.7 °C22 July 1955	-17.9 °C3 February 1955	12.4 °C	978 mm	47	94
1954	37.8 °C31 July 1954	-19.0 °C18 January 1954	12.4 °C	986 mm	33	82
1953	38.6 °C2 September 1953	-9.4 °C18 December 1953	13.2 °C	1,092 mm	46	62
1952	37.6 °C26 June 1952	-13.9 °C30 January 1952	12.5 °C	1,368 mm	39	68
1951	33.6 °C27 July 1951	-16.6 °C17 December 1951	12.3 °C	1,173 mm	29	75
1950	33.2 °C26 June 1950	-13.9 °C27 December 1950	11.8 °C	1,101 mm	20	94
1949	37.0 °C5 July 1949	-12.3 °C20 March 1949	13.3 °C	896 mm	45	68
1948	36.2 °C26 August 1948	-19.1 °C19 January 1948	11.5 °C	1,279 mm	24	88
1947	33.8 °C14 August 1947	-14.4 °C5 February 1947	11.8 °C	1,075 mm	20	96
1946	32.3 °C19 July 1946	-14.7 °C23 January 1946	12.6 °C	1,053 mm	15	68
1945	34.8 °C1 July 1945	-18.5 °C25 January 1945	11.8 °C	1,437 mm	18	84
1944	34.8 °C5 August 1944	-11.9 °C22 December 1944	11.9 °C	1,180 mm	41	97
1943	34.1 °C25 June 1943	-18.7 °C16 February 1943	11.4 °C	949 mm	40	100
1942	34.6 °C19 July 1942	-17.7 °C11 January 1942	11.8 °C	1,256 mm	22	90
1941	35.4 °C28 July 1941	-12.7 °C10 February 1941	12.0 °C	967 mm	32	95
1940	34.5 °C26 July 1940	-15.8 °C20 January 1940	10.8 °C	1,281 mm	13	96

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

17.5 °C

+0.5 °C

Hot days (≥ 30 °C)

38 d/yr

Frost days (< 0 °C)

84 d/yr

Annual rainfall

1030 mm

-119 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	2.3 °C	-1.4 °C	30 mm	-52 mm
Feb	5.6 °C	+0.2 °C	72 mm	-7 mm
Mar	15.0 °C	+4.7 °C	93 mm	-9 mm
Apr	18.3 °C	+1.6 °C	89 mm	-11 mm
May	21.9 °C	-0.3 °C	160 mm	+57 mm
Jun	27.9 °C	+0.9 °C	80 mm	-19 mm
Jul	30.8 °C	+1.5 °C	200 mm	+86 mm
Aug	27.2 °C	-1.0 °C	23 mm	-82 mm
Sep	25.8 °C	+1.3 °C	93 mm	-4 mm
Oct	18.9 °C	+0.5 °C	80 mm	-4 mm
Nov	12.1 °C	+0.1 °C	49 mm	-40 mm
Dec	4.0 °C	-2.0 °C	61 mm	-34 mm

The year's extremes

Hottest day

37.5 °C

24 Jun 2025

Coldest day

-13.3 °C

23 Jan 2025

Wettest day

67.2 mm

31 Jul 2025

Windiest day

34.1 km/h

11 Nov 2025

Strongest gust

83.5 km/h

16 Feb 2025

Hottest feels-like

42.3 °C

23 Jun 2025

Coldest feels-like

-18.0 °C

22 Jan 2025

Snowiest day

8.0 cm

14 Dec 2025

Sunniest day

14.1 h

4 Jul 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 West Chester?

West Chester has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.3 °C and it receives 1,148 mm of precipitation per year.

What is the hottest day ever recorded in West Chester?

The hottest day measured in West Chester between 1940 and 2025 was 22 July 2011, reaching 40.1 °C.

What is the coldest day in West Chester?

The coldest day measured in West Chester between 1940 and 2025 was 22 January 1984, at -24.7 °C.

Does it snow in West Chester?

Yes. West Chester gets on average 56.7 cm of snow per year and has around 82 frost days.

Has the climate of West Chester warmed?

Yes: West Chester warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in West Chester?

The wettest day measured in West Chester between 1940 and 2025 was 16 September 1999, with 136 mm of rain in 24 hours.

What was the windiest day in West Chester?

The windiest day measured in West Chester between 1940 and 2025 was 15 October 1954, with winds reaching 51.4 km/h.

What is the warmest month in West Chester?

The warmest month in West Chester is July (24.5 °C on average); the coldest is January (0.0 °C).

How much does it rain in West Chester?

West Chester receives on average 1,148 mm of precipitation per year, spread over about 121 rainy days.

Is it sunny in West Chester?

West Chester gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

What is the biggest single-day snowfall in West Chester?

The heaviest 24-hour snowfall measured in West Chester between 1940 and 2025 was 20 March 1958, with 38.3 cm.

Are there tropical nights in West Chester?

Yes: West Chester has on average 44 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in West Chester?

In West Chester, between 1940 and 2025, the highest apparent temperature reached 45.2 °C on 15 July 1995, and the lowest was -30.0 °C on 22 January 1984.

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