United States · 1991–2020

Best time to visit
Harthaven.

June leads for comfortable weather in Harthaven: typically 23.1°C by day, 14.1°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high23.1°C

Typical low14.1°C

Rain in June86 mm

Comfort

June

June · September · July

84climate match

Beach

July

July · August · June

76climate match

Outdoors

May

May · October · June

76climate match

The weakest month is January, scoring 5 against June’s 84 — days reach only 4.5°C, 19° 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

54.5° / -4°

Feb

55.2° / -3.4°

Mar

57.9° / -0.5°

Apr

2812.9° / 4°

May

5718.1° / 9°

Jun

8423.1° / 14.1°

Jul

7926.8° / 17.8°

Aug

7526.5° / 17.5°

Sep

8423.2° / 14.5°

Oct

5117.7° / 8.7°

Nov

2612.4° / 3.8°

Dec

57.5° / -0.7°

Monthly climate evidence for Harthaven — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 10 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	4.5°C	-4°C	104 mm	9.4	5.1°C	9 h 29	5	Strong coverage
February	5.2°C	-3.4°C	91 mm	8.5	3.3°C	10 h 32	5	Strong coverage
March	7.9°C	-0.5°C	122 mm	9.6	3.8°C	11 h 48	5	Strong coverage
April	12.9°C	4°C	106 mm	9.6	6.7°C	13 h 16	28	Strong coverage
May	18.1°C	9°C	93 mm	8.7	10.9°C	14 h 29	57	Strong coverage
June	23.1°C	14.1°C	86 mm	7.7	15.6°C	15 h 09	84	Strong coverage
July	26.8°C	17.8°C	67 mm	6	19.9°C	14 h 53	79	Strong coverage
August	26.5°C	17.5°C	95 mm	7	20.9°C	13 h 50	75	Strong coverage
September	23.2°C	14.5°C	99 mm	6.7	19.3°C	12 h 25	84	Strong coverage
October	17.7°C	8.7°C	118 mm	8.5	16.0°C	11 h 01	51	Strong coverage
November	12.4°C	3.8°C	106 mm	8.6	12.0°C	9 h 48	26	Strong coverage
December	7.5°C	-0.7°C	123 mm	10.2	8.2°C	9 h 11	5	Strong coverage

What has changed

Harthaven runs +1.5°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

+1.9

Feb

+2.2

Mar

+1.0

Apr

+1.0

May

+1.0

Jun

+1.0

Jul

+1.8

Aug

+1.5

Sep

+1.7

Oct

+1.5

Nov

+1.2

Dec

+2.2

June daytime highs, 2011–2025. Last recorded: 23.9°C.

Records at EDGARTOWN, 1946–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.3°C25 Jan 1967	-21.1°C16 Jan 2004	72 mm7 Jan 1962	232 mm2023 · driest 23 mm in 1955	80
February	21.1°C17 Feb 2023	-22.8°C2 Feb 1961	94 mm25 Feb 1969	202 mm2018 · driest 20 mm in 1968	80
March	23.9°C22 Mar 2012	-21.7°C4 Mar 1950	84 mm17 Mar 2000	224 mm1983 · driest 20 mm in 2006	81
April	32.2°C29 Apr 1990	-11.1°C4 Apr 1954	72 mm27 Apr 1973	252 mm1987 · driest 22 mm in 1963	81
May	32.8°C26 May 2007	-2.2°C20 May 1992	79 mm30 May 1963	222 mm1948 · driest 14 mm in 2015	81
June	35.0°C23 Jun 2012	2.8°C4 Jun 1947	117 mm21 Jun 1981	278 mm2006 · driest 0 mm in 1949	80
July	35.0°C2 Jul 1964	7.2°C1 Jul 1988	95 mm30 Jul 1986	247 mm1984 · driest 8 mm in 1968	80
August	37.2°C27 Aug 1948	5.0°C30 Aug 1986	153 mm31 Aug 1985	352 mm1946 · driest 7 mm in 2005	80
September	33.3°C2 Sep 2010	0.0°C29 Sep 1947	178 mm3 Sep 1972	320 mm1996 · driest 8 mm in 2013	80
October	31.1°C7 Oct 1959	-5.6°C31 Oct 1966	89 mm26 Oct 2017	237 mm1948 · driest 18 mm in 2013	79
November	23.3°C4 Nov 1990	-10.0°C22 Nov 1951	87 mm3 Nov 1970	244 mm2018 · driest 17 mm in 2001	79
December	19.4°C5 Dec 1998	-20.6°C28 Dec 1950	91 mm27 Dec 1969	238 mm1992 · driest 24 mm in 1989	80

Typical days per month at EDGARTOWN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	4	4
February	0	0	22	3	3
March	0	0	18	4	2
April	<1	<1	4	3	<1
May	2	<1	<1	3	0
June	10	1	0	3	0
July	24	5	0	2	0
August	24	3	0	3	0
September	10	<1	0	3	0
October	<1	0	1	4	0
November	0	0	8	3	<1
December	0	0	19	4	1

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 87); on 2011–2025 it is June (90). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in EDGARTOWN’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%	31%	12%	37%	1.2–6.8°C
February	0%	30%	12%	37%	2.0–7.0°C
March	<1%	31%	13%	39%	6.0–9.5°C
April	4%	32%	11%	39%	10.5–14.1°C
May	24%	29%	11%	36%	16.1–19.1°C
June	65%	25%	8%	25%	21.1–24.2°C
July	79%	21%	7%	17%	24.4–27.7°C
August	76%	23%	9%	21%	24.5–27.4°C
September	65%	23%	9%	23%	20.9–24.1°C
October	22%	26%	10%	27%	16.0–19.3°C
November	2%	31%	12%	38%	10.5–14.1°C
December	0%	33%	12%	42%	4.0–9.3°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.

1947Each stripe is one year’s mean temperature against the 76-year average. Warmest: 2012. Coolest: 1960.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4938938
NOAA station: USC00192501 · EDGARTOWN
Station distance: 7.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 41.44°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 10 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 EDGARTOWN is what differs

Edgartown→Seconsett Island→Katama→Chappaquiddick→Clevelandtown→Hartsville→

Or put two places side by side: Harthaven vs Edgartown

Best time to visitHarthaven.

June

July

May

The whole year,without the guesswork.

Harthaven runs +1.5°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Harthaven.

The whole year,
without the guesswork.

Harthaven runs +1.5°C
on the 1961–1990 baseline.

Nearby, measured,
and named.