United States · 1991–2020

Best time to visit
East Haven.

September leads for comfortable weather in East Haven: typically 24.3°C by day, 14.5°C at night, with 101 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.3°C

Typical low14.5°C

Rain in September101 mm

Comfort

September

September · June · August

86climate match

Beach

July

July · August · June

81climate match

Outdoors

May

May · October · September

82climate match

The weakest month is January, scoring 5 against September’s 86 — days reach only 3.4°C, 21° 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

53.4° / -4.9°

Feb

54.5° / -4.5°

Mar

108.5° / -0.7°

Apr

3414.6° / 4.4°

May

6419.8° / 10°

Jun

8224.8° / 15.4°

Jul

6828.4° / 19.2°

Aug

7027.7° / 18.5°

Sep

8624.3° / 14.5°

Oct

5317.9° / 8.3°

Nov

2912.1° / 2.6°

Dec

56.5° / -1.5°

Monthly climate evidence for East Haven — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 17 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	3.4°C	-4.9°C	59 mm	6.9	3.9°C	9 h 30	5	Good coverage
February	4.5°C	-4.5°C	70 mm	6.9	2.0°C	10 h 33	5	Good coverage
March	8.5°C	-0.7°C	84 mm	7.3	2.9°C	11 h 48	10	Good coverage
April	14.6°C	4.4°C	110 mm	8.4	6.7°C	13 h 15	34	Good coverage
May	19.8°C	10°C	89 mm	9.8	12.1°C	14 h 28	64	Good coverage
June	24.8°C	15.4°C	100 mm	8.8	17.6°C	15 h 08	82	Good coverage
July	28.4°C	19.2°C	79 mm	7.7	21.7°C	14 h 52	68	Good coverage
August	27.7°C	18.5°C	89 mm	7.4	22.8°C	13 h 49	70	Good coverage
September	24.3°C	14.5°C	101 mm	6.1	21.6°C	12 h 25	86	Good coverage
October	17.9°C	8.3°C	107 mm	8.3	17.9°C	11 h 01	53	Good coverage
November	12.1°C	2.6°C	76 mm	7.5	12.8°C	9 h 48	29	Good coverage
December	6.5°C	-1.5°C	97 mm	8.8	7.9°C	9 h 13	5	Good coverage

What has changed

East Haven runs +1.8°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

+2.3

Feb

—

Mar

+1.6

Apr

+1.1

May

+1.4

Jun

+1.2

Jul

+2.2

Aug

+1.7

Sep

+1.9

Oct

+1.5

Nov

—

Dec

+3.1

September daytime highs, 2011–2025. Last recorded: 25.8°C.

Records at NEW HAVEN TWEED AP, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.6°C12 Jan 2020	-22.2°C19 Jan 1948	66 mm6 Jan 1962	212 mm1958 · driest 6 mm in 1970	54
February	20.0°C16 Feb 2023	-21.0°C14 Feb 2016	70 mm13 Feb 1966	170 mm2008 · driest 17 mm in 2023	52
March	25.0°C26 Mar 2021	-17.2°C6 Mar 1948	96 mm21 Mar 1974	274 mm1953 · driest 7 mm in 2006	54
April	31.1°C14 Apr 2023	-8.3°C4 Apr 1954	101 mm23 Apr 2006	230 mm2007 · driest 26 mm in 2013	54
May	35.0°C31 May 2022	-1.0°C1 May 2008	90 mm12 May 2006	198 mm1948 · driest 18 mm in 2015	54
June	36.7°C25 Jun 2025	4.4°C1 Jun 1967	59 mm1 Jun 1952	211 mm2013 · driest 3 mm in 1949	54
July	38.3°C22 Jul 2011	10.0°C11 Jul 2002	117 mm19 Jul 1971	222 mm1971 · driest 17 mm in 2011	55
August	37.8°C27 Aug 1948	6.1°C31 Aug 1976	107 mm28 Aug 2006	278 mm1955 · driest 18 mm in 2005	54
September	35.0°C7 Sep 2023	1.1°C28 Sep 1957	129 mm12 Sep 1960	236 mm2004 · driest 16 mm in 1959	54
October	31.7°C2 Oct 2019	-4.9°C19 Oct 2015	84 mm26 Oct 2021	371 mm2005 · driest 7 mm in 1963	52
November	26.7°C1 Nov 2024	-10.5°C23 Nov 2018	110 mm7 Nov 1963	218 mm1963 · driest 9 mm in 1976	52
December	18.3°C27 Dec 1973	-19.4°C27 Dec 1948	75 mm10 Dec 2023	219 mm2023 · driest 25 mm in 1955	53

Typical days per month at NEW HAVEN TWEED AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	25	2
February	0	0	24	2
March	0	0	17	2
April	<1	<1	4	3
May	5	<1	<1	3
June	16	3	0	4
July	28	10	0	3
August	27	8	0	3
September	14	1	0	3
October	2	<1	2	3
November	0	0	10	3
December	0	0	21	3

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 94); on 2011–2025 it is September (89). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in NEW HAVEN TWEED AP’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%	26%	8%	29%	-0.2–6.1°C
February	<1%	27%	9%	33%	1.2–7.1°C
March	<1%	28%	10%	34%	5.8–11.0°C
April	12%	29%	10%	34%	12.1–15.9°C
May	38%	30%	10%	35%	17.2–21.2°C
June	69%	27%	9%	29%	23.1–26.4°C
July	76%	25%	8%	24%	26.3–30.0°C
August	77%	23%	8%	21%	25.6–28.5°C
September	69%	22%	10%	20%	21.7–25.3°C
October	28%	22%	9%	22%	16.3–19.7°C
November	3%	27%	10%	29%	9.6–13.7°C
December	0%	30%	11%	35%	2.6–8.6°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.

1948Each stripe is one year’s mean temperature against the 49-year average. Warmest: 2024. Coolest: 1958.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4833425
NOAA station: USW00014758 · NEW HAVEN TWEED AP
Station distance: 2.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 41.28°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 17 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 NEW HAVEN TWEED AP is what differs

New Haven→West Haven→Branford→Guilford→Madison→North Branford→

Or put two places side by side: East Haven vs New Haven

Best time to visitEast Haven.

September

July

May

The whole year,without the guesswork.

East Haven runs +1.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
East Haven.

The whole year,
without the guesswork.

East Haven runs +1.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.