United States · 1991–2020

Best time to visit
Great Valley.

August leads for comfortable weather in Great Valley: typically 26.6°C by day, 10.8°C at night, with 108 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.6°C

Typical low10.8°C

Rain in August108 mm

Comfort

August

August · June · July

68climate match

Beach

July

July · August · June

45climate match

Outdoors

May

May · September · June

70climate match

The weakest month is January, scoring 5 against August’s 68 — days reach only 0.6°C, 23° below the 24°C the score treats as ideal, and nights drop to -10.8°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

50.6° / -10.8°

Feb

51.6° / -11.6°

Mar

56.3° / -7.5°

Apr

2113.9° / -1.2°

May

5420.4° / 4°

Jun

6725.4° / 9.6°

Jul

6527° / 11.5°

Aug

6826.6° / 10.8°

Sep

6422.5° / 6.8°

Oct

3316.1° / 0.9°

Nov

58.9° / -2.9°

Dec

52.7° / -8°

Monthly climate evidence for Great Valley — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.6°C	-10.8°C	89 mm	14.2	9 h 25	5	Good coverage
February	1.6°C	-11.6°C	54 mm	10.4	10 h 30	5	Good coverage
March	6.3°C	-7.5°C	78 mm	12.2	11 h 48	5	Good coverage
April	13.9°C	-1.2°C	97 mm	11.8	13 h 18	21	Good coverage
May	20.4°C	4°C	87 mm	10.8	14 h 33	54	Good coverage
June	25.4°C	9.6°C	117 mm	10.6	15 h 15	67	Good coverage
July	27°C	11.5°C	121 mm	10.2	14 h 58	65	Good coverage
August	26.6°C	10.8°C	108 mm	9.7	13 h 53	68	Good coverage
September	22.5°C	6.8°C	112 mm	9.8	12 h 26	64	Good coverage
October	16.1°C	0.9°C	92 mm	11.1	10 h 59	33	Good coverage
November	8.9°C	-2.9°C	100 mm	12.5	9 h 44	5	Good coverage
December	2.7°C	-8°C	89 mm	13.3	9 h 06	5	Good coverage

Records at SALAMANCA 2, 1991–2008
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.9°C9 Jan 2008	-32.2°C6 Jan 1996	57 mm6 Jan 2007	186 mm2007 · driest 34 mm in 2008	17
February	21.1°C22 Feb 1997	-27.8°C4 Feb 1996	36 mm1 Feb 2002	92 mm2002 · driest 13 mm in 2004	16
March	27.8°C31 Mar 1998	-27.2°C15 Mar 1993	39 mm14 Mar 2006	118 mm1997 · driest 31 mm in 2002	16
April	31.1°C19 Apr 2002	-13.3°C9 Apr 1997	42 mm20 Apr 1998	139 mm1994 · driest 52 mm in 1997	16
May	35.0°C31 May 2006	-7.2°C4 May 2002	56 mm19 May 2000	191 mm2004 · driest 32 mm in 1991	17
June	33.9°C21 Jun 1995	-1.1°C2 Jun 1993	66 mm14 Jun 1994	253 mm1994 · driest 8 mm in 1991	17
July	34.4°C16 Jul 1995	1.7°C12 Jul 2002	95 mm30 Jul 2000	222 mm1992 · driest 39 mm in 2001	17
August	35.0°C9 Aug 2001	2.2°C8 Aug 2002	87 mm31 Aug 2005	191 mm1994 · driest 38 mm in 2001	17
September	34.4°C10 Sep 2002	-3.9°C24 Sep 1995	93 mm9 Sep 2004	191 mm2004 · driest 54 mm in 1998	17
October	29.4°C7 Oct 2007	-12.2°C31 Oct 2002	49 mm21 Oct 1995	207 mm2006 · driest 36 mm in 1994	17
November	25.6°C5 Nov 2003	-22.2°C24 Nov 2000	61 mm1 Nov 1994	156 mm1994 · driest 34 mm in 1998	17
December	21.7°C6 Dec 2001	-28.3°C30 Dec 1993	34 mm12 Dec 2007	126 mm1992 · driest 60 mm in 2005	16

Typical days per month at SALAMANCA 2, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	2	12
February	0	0	27	1	10
March	<1	0	26	2	8
April	2	<1	20	4	2
May	8	1	8	3	0
June	18	5	<1	4	0
July	22	7	0	4	0
August	22	5	0	3	0
September	11	1	2	4	0
October	3	0	15	3	<1
November	<1	0	22	3	4
December	0	0	27	3	9

How often, not how much — every day in SALAMANCA 2’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	0%	46%	8%	67%	-3.6–3.4°C
February	<1%	37%	4%	53%	-1.5–4.6°C
March	5%	40%	7%	58%	3.9–9.2°C
April	12%	39%	12%	56%	11.1–16.3°C
May	38%	35%	10%	47%	18.0–23.0°C
June	58%	35%	12%	44%	23.3–27.3°C
July	66%	33%	14%	43%	25.4–28.9°C
August	68%	31%	10%	41%	24.4–28.7°C
September	52%	33%	14%	39%	20.6–24.9°C
October	23%	36%	10%	47%	14.0–17.7°C
November	3%	42%	10%	61%	5.7–11.8°C
December	<1%	43%	8%	66%	-0.5–6.3°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.

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5119240
NOAA station: USC00307400 · SALAMANCA 2
Station distance: 9.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 42.21°, 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 SALAMANCA 2 is what differs

Salamanca→Bradford Junction→Carrollton→Kill Buck→Little Rock City→Peth→

Or put two places side by side: Great Valley vs Salamanca

Best time to visitGreat Valley.

August

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Great Valley.

The whole year,
without the guesswork.

Nearby, measured,
and named.