United States · 1991–2020

Best time to visit
Collegeville.

June leads for comfortable weather in Collegeville: typically 27.2°C by day, 14.5°C at night, with 113 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high27.2°C

Typical low14.5°C

Rain in June113 mm

Comfort

June

June · September · May

73climate match

Beach

July

July · August · June

65climate match

Outdoors

May

May · October · September

72climate match

The weakest month is January, scoring 5 against June’s 73 — days reach only 4.1°C, 20° below the 24°C the score treats as ideal, and nights drop to -7.1°C.

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

54.1° / -7.1°

Feb

55.7° / -6°

Mar

1010° / -2.1°

Apr

4016.6° / 3.2°

May

6822.2° / 8.7°

Jun

7327.2° / 14.5°

Jul

5930° / 17.2°

Aug

6629° / 15.6°

Sep

7325.5° / 11.4°

Oct

5019.1° / 4.7°

Nov

2512.9° / -0.1°

Dec

57.2° / -4.1°

Monthly climate evidence for Collegeville — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4.1°C	-7.1°C	82 mm	7	9 h 36	5	Strong coverage
February	5.7°C	-6°C	58 mm	6.3	10 h 37	5	Strong coverage
March	10°C	-2.1°C	94 mm	8.5	11 h 49	10	Strong coverage
April	16.6°C	3.2°C	100 mm	9.1	13 h 13	40	Strong coverage
May	22.2°C	8.7°C	102 mm	9.6	14 h 23	68	Strong coverage
June	27.2°C	14.5°C	113 mm	8.7	15 h 01	73	Strong coverage
July	30°C	17.2°C	118 mm	9.1	14 h 46	59	Strong coverage
August	29°C	15.6°C	120 mm	8.4	13 h 45	66	Good coverage
September	25.5°C	11.4°C	122 mm	7.1	12 h 24	73	Strong coverage
October	19.1°C	4.7°C	110 mm	8.2	11 h 04	50	Strong coverage
November	12.9°C	-0.1°C	85 mm	7.3	9 h 54	25	Strong coverage
December	7.2°C	-4.1°C	107 mm	8.9	9 h 19	5	Strong coverage

What has changed

Collegeville runs +1.2°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.3

Feb

+1.6

Mar

+0.6

Apr

+0.8

May

+1.0

Jun

+0.7

Jul

+1.4

Aug

+0.8

Sep

+1.4

Oct

+1.4

Nov

+0.4

Dec

+2.5

June daytime highs, 2011–2021. Last recorded: 28.1°C.

Records at GRATERFORD 1 E, 1960–2022
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C7 Jan 2007	-27.2°C20 Jan 1994	67 mm25 Jan 1979	248 mm1979 · driest 1 mm in 2022	60
February	25.6°C22 Feb 2018	-23.9°C23 Feb 1999	58 mm23 Feb 2003	157 mm2018 · driest 0 mm in 2022	60
March	30.6°C31 Mar 1998	-18.9°C19 Mar 1967	82 mm22 Mar 2000	172 mm1984 · driest 0 mm in 2021	59
April	35.6°C17 Apr 2002	-10.6°C3 Apr 1995	102 mm16 Apr 2007	294 mm2007 · driest 11 mm in 1963	59
May	35.0°C24 May 1998	-6.1°C1 May 2000	109 mm1 May 2014	230 mm2014 · driest 6 mm in 2015	57
June	37.2°C15 Jun 1983	-2.2°C11 Jun 1987	91 mm25 Jun 2006	304 mm2006 · driest 7 mm in 1966	57
July	41.1°C18 Jul 1999	1.7°C2 Jul 1988	81 mm13 Jul 2004	278 mm1984 · driest 0 mm in 2021	58
August	38.3°C3 Aug 2002	-2.2°C25 Aug 1987	171 mm28 Aug 2011	330 mm2011 · driest 16 mm in 1964	56
September	37.2°C11 Sep 1983	-5.6°C26 Sep 1987	150 mm17 Sep 1999	287 mm2004 · driest 11 mm in 2021	60
October	33.3°C3 Oct 2019	-12.2°C30 Oct 1987	86 mm8 Oct 2005	246 mm1995 · driest 2 mm in 2021	57
November	27.8°C3 Nov 1982	-13.9°C30 Nov 1996	69 mm7 Nov 1963	227 mm1972 · driest 0 mm in 2021	61
December	28.9°C8 Dec 1998	-21.7°C27 Dec 1983	78 mm12 Dec 2008	216 mm1996 · driest 7 mm in 1989	61

Typical days per month at GRATERFORD 1 E, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	3	2
February	0	0	24	2	1
March	<1	0	22	3	<1
April	3	<1	8	3	<1
May	10	3	1	4	0
June	22	9	0	4	0
July	29	17	0	4	0
August	28	13	0	4	0
September	17	5	<1	4	0
October	4	<1	7	3	0
November	<1	0	16	3	<1
December	0	0	23	4	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 84); on 2011–2025 it is September (82). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in GRATERFORD 1 E’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%	22%	9%	22%	-0.2–6.6°C
February	<1%	21%	8%	17%	1.7–8.9°C
March	6%	25%	10%	28%	6.7–12.6°C
April	20%	28%	10%	31%	13.6–18.7°C
May	49%	30%	12%	38%	19.6–24.6°C
June	69%	28%	11%	30%	24.9–28.4°C
July	73%	26%	12%	29%	27.9–31.4°C
August	74%	25%	10%	27%	27.0–30.5°C
September	70%	23%	11%	22%	22.7–27.5°C
October	33%	22%	9%	22%	16.4–21.1°C
November	7%	23%	10%	23%	9.8–14.8°C
December	<1%	26%	11%	28%	2.8–9.3°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.

1961Each stripe is one year’s mean temperature against the 46-year average. Warmest: 2006. Coolest: 1987.2021

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5184966
NOAA station: USC00363437 · GRATERFORD 1 E
Station distance: 5.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 40.19°, 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 GRATERFORD 1 E is what differs

Lansdale→Harleysville→Kulpsville→Eagleville→Skippack→Trappe→

Or put two places side by side: Collegeville vs Lansdale

Best time to visitCollegeville.

June

July

May

The whole year,without the guesswork.

Collegeville runs +1.2°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Collegeville.

The whole year,
without the guesswork.

Collegeville runs +1.2°C
on the 1961–1990 baseline.

Nearby, measured,
and named.