United States · 1991–2020

Best time to visit
West Chester.

May leads for comfortable weather in West Chester: typically 23.4°C by day, 9.4°C at night, with 97 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.4°C

Typical low9.4°C

Rain in May97 mm

Comfort

May

May · June · September

74climate match

Beach

July

July · August · June

68climate match

Outdoors

May

May · April · October

71climate match

The weakest month is January, scoring 5 against May’s 74 — days reach only 4.2°C, 20° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

54.2° / -6.7°

Feb

55.9° / -6.4°

Mar

1211.1° / -1.7°

Apr

4618° / 3.7°

May

7423.4° / 9.4°

Jun

6928.1° / 14.9°

Jul

6030.2° / 17.6°

Aug

6229.5° / 16.9°

Sep

6925.9° / 12.2°

Oct

4618.9° / 5.4°

Nov

2813.5° / 0.3°

Dec

57.3° / -3.8°

Monthly climate evidence for West Chester — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4.2°C	-6.7°C	85 mm	8.5	9 h 37	5	Good coverage
February	5.9°C	-6.4°C	80 mm	6.8	10 h 37	5	Good coverage
March	11.1°C	-1.7°C	106 mm	8.8	11 h 49	12	Good coverage
April	18°C	3.7°C	96 mm	8.7	13 h 12	46	Good coverage
May	23.4°C	9.4°C	97 mm	9.1	14 h 22	74	Good coverage
June	28.1°C	14.9°C	120 mm	9	14 h 59	69	Good coverage
July	30.2°C	17.6°C	107 mm	8.4	14 h 45	60	Good coverage
August	29.5°C	16.9°C	125 mm	7.7	13 h 45	62	Good coverage
September	25.9°C	12.2°C	152 mm	7.2	12 h 24	69	Good coverage
October	18.9°C	5.4°C	144 mm	8.9	11 h 04	46	Good coverage
November	13.5°C	0.3°C	84 mm	7.5	9 h 55	28	Good coverage
December	7.3°C	-3.8°C	123 mm	9.2	9 h 21	5	Good coverage

Records at W CHESTER 2 NW, 1893–2017
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.8°C25 Jan 1967	-26.7°C22 Jan 1984	87 mm3 Jan 1936	253 mm1979 · driest 12 mm in 1955	116
February	25.6°C25 Feb 1930	-26.7°C10 Feb 1934	99 mm6 Feb 1896	182 mm1902 · driest 15 mm in 2002	114
March	30.6°C29 Mar 1945	-20.0°C7 Mar 2015	120 mm22 Mar 2000	214 mm2000 · driest 13 mm in 1910	115
April	35.6°C18 Apr 2002	-12.2°C1 Apr 1923	77 mm16 Apr 2007	224 mm1913 · driest 21 mm in 1963	113
May	36.7°C20 May 1962	-2.8°C1 May 1978	141 mm21 May 1894	366 mm1894 · driest 6 mm in 1955	114
June	38.3°C28 Jun 1963	1.7°C11 Jun 1972	136 mm21 Jun 2003	334 mm1928 · driest 12 mm in 1988	114
July	40.6°C10 Jul 1936	7.2°C9 Jul 1984	111 mm10 Jul 1931	370 mm1919 · driest 15 mm in 2002	114
August	40.0°C7 Aug 1918	3.3°C29 Aug 1982	190 mm28 Aug 2011	396 mm1955 · driest 20 mm in 1972	114
September	38.3°C3 Sep 1953	-0.6°C25 Sep 1983	226 mm29 Sep 2004	377 mm1971 · driest 10 mm in 2007	114
October	36.1°C5 Oct 1941	-7.2°C31 Oct 1983	142 mm1 Oct 2010	254 mm2012 · driest 1 mm in 1963	113
November	28.9°C1 Nov 1950	-11.7°C30 Nov 1976	151 mm25 Nov 1950	229 mm1947 · driest 10 mm in 1922	110
December	25.6°C6 Dec 2001	-24.4°C30 Dec 1917	81 mm29 Dec 1901	230 mm1983 · driest 7 mm in 1955	113

Typical days per month at W CHESTER 2 NW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	3	5
February	0	0	26	2	4
March	<1	0	21	3	2
April	5	1	9	3	<1
May	12	4	<1	3	0
June	24	12	0	4	0
July	29	19	0	3	0
August	28	16	0	3	0
September	18	6	<1	4	0
October	5	<1	6	4	<1
November	<1	0	17	3	<1
December	<1	0	25	4	3

How often, not how much — every day in W CHESTER 2 NW’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	<1%	29%	11%	31%	0.6–7.1°C
February	<1%	28%	10%	31%	0.8–7.8°C
March	7%	30%	11%	36%	7.3–13.7°C
April	25%	31%	11%	37%	14.7–19.2°C
May	53%	31%	12%	38%	20.5–25.1°C
June	68%	30%	12%	33%	25.1–29.2°C
July	70%	29%	11%	33%	28.0–31.6°C
August	72%	28%	11%	29%	26.7–30.4°C
September	70%	23%	10%	21%	23.4–27.1°C
October	35%	22%	9%	21%	16.8–20.9°C
November	7%	25%	9%	27%	9.9–14.6°C
December	<1%	27%	11%	29%	2.6–8.4°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1894Each stripe is one year’s mean temperature against the 97-year average. Warmest: 1949. Coolest: 1904.2016

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4562144
NOAA station: USC00369464 · W CHESTER 2 NW
Station distance: 2.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 39.96°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from W CHESTER 2 NW is what differs

Downingtown→Lionville→Exton→Thorndale→Eagleview→Altor→

Or put two places side by side: West Chester vs Downingtown

Best time to visitWest Chester.

May

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
West Chester.

The whole year,
without the guesswork.

Nearby, measured,
and named.