United States · 1991–2020

Best time to visit
Greenwich.

September leads for comfortable weather in Greenwich: typically 23.5°C by day, 13.8°C at night, with 125 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.5°C

Typical low13.8°C

Rain in September125 mm

Comfort

September

September · June · August

80climate match

Beach

July

July · August · June

74climate match

Outdoors

May

May · October · September

80climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only 2.9°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

52.9° / -5.2°

Feb

54.5° / -4.5°

Mar

78.7° / -0.7°

Apr

3615° / 4.6°

May

6520.6° / 10°

Jun

7925.5° / 15.3°

Jul

6528.4° / 18.5°

Aug

7027.4° / 17.7°

Sep

8023.5° / 13.8°

Oct

5017.2° / 7.6°

Nov

2311.2° / 2.4°

Dec

55.7° / -2°

Monthly climate evidence for Greenwich — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 24 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	2.9°C	-5.2°C	79 mm	7.9	3.8°C	9 h 31	5	Strong coverage
February	4.5°C	-4.5°C	66 mm	6.9	1.9°C	10 h 34	5	Strong coverage
March	8.7°C	-0.7°C	96 mm	8.7	2.8°C	11 h 49	7	Strong coverage
April	15°C	4.6°C	108 mm	8.8	6.8°C	13 h 15	36	Strong coverage
May	20.6°C	10°C	98 mm	9.4	12.5°C	14 h 27	65	Strong coverage
June	25.5°C	15.3°C	112 mm	8.6	18.3°C	15 h 06	79	Strong coverage
July	28.4°C	18.5°C	105 mm	7.9	22.2°C	14 h 51	65	Strong coverage
August	27.4°C	17.7°C	102 mm	8.2	23.1°C	13 h 49	70	Strong coverage
September	23.5°C	13.8°C	125 mm	7.4	21.8°C	12 h 25	80	Strong coverage
October	17.2°C	7.6°C	111 mm	7.5	18.0°C	11 h 02	50	Strong coverage
November	11.2°C	2.4°C	91 mm	7.5	12.7°C	9 h 50	23	Strong coverage
December	5.7°C	-2°C	106 mm	9.1	7.8°C	9 h 14	5	Strong coverage

What has changed

Greenwich runs +1.4°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

+2.1

Feb

+2.3

Mar

+1.2

Apr

+1.0

May

+0.8

Jun

+0.8

Jul

+1.3

Aug

+0.8

Sep

+1.5

Oct

+1.5

Nov

+0.9

Dec

+2.5

September daytime highs, 2011–2025. Last recorded: 24.9°C.

Records at WESTCHESTER CO AP, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C6 Jan 2007	-23.3°C22 Jan 1961	84 mm21 Jan 1979	284 mm1979 · driest 0 mm in 2026	74
February	25.0°C21 Feb 2018	-23.3°C11 Feb 1979	70 mm2 Feb 1973	184 mm1981 · driest 8 mm in 2009	73
March	27.8°C31 Mar 1998	-21.1°C19 Mar 1967	89 mm13 Mar 1953	291 mm1953 · driest 12 mm in 2009	73
April	33.3°C17 Apr 2002	-8.9°C7 Apr 1982	173 mm15 Apr 2007	325 mm2007 · driest 24 mm in 1985	76
May	35.6°C30 May 1969	0.0°C1 May 2008	122 mm29 May 1968	335 mm1989 · driest 12 mm in 1993	76
June	36.7°C24 Jun 2025	3.9°C11 Jun 1980	137 mm19 Jun 1972	363 mm1972 · driest 2 mm in 1949	75
July	38.9°C4 Jul 1966	7.8°C5 Jul 1979	95 mm21 Jul 2026	224 mm1984 · driest 11 mm in 1999	76
August	38.3°C9 Aug 2001	5.0°C29 Aug 1982	132 mm28 Aug 2011	355 mm2011 · driest 9 mm in 1995	76
September	37.8°C2 Sep 1953	0.0°C20 Sep 2004	154 mm1 Sep 2021	326 mm1975 · driest 15 mm in 2009	76
October	32.2°C2 Oct 2019	-4.4°C21 Oct 1972	129 mm12 Oct 1983	398 mm2005 · driest 2 mm in 2024	75
November	26.1°C1 Nov 2024	-11.6°C23 Nov 2018	126 mm8 Nov 1977	235 mm1972 · driest 7 mm in 1976	75
December	23.9°C7 Dec 1998	-20.6°C25 Dec 1980	72 mm4 Dec 1968	256 mm1983 · driest 13 mm in 1955	73

Typical days per month at WESTCHESTER CO AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	3	3
February	0	0	22	2	3
March	<1	0	18	3	2
April	2	<1	4	3	<1
May	7	1	<1	3	0
June	18	5	0	4	0
July	27	11	0	4	0
August	25	8	0	3	0
September	12	2	0	3	0
October	2	<1	1	3	0
November	<1	0	9	3	<1
December	0	0	21	3	2

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 88); on 2011–2025 it is September (87). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in WESTCHESTER CO 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%	27%	10%	30%	-0.9–5.3°C
February	<1%	26%	9%	28%	0.6–7.3°C
March	3%	28%	11%	34%	5.6–11.2°C
April	15%	30%	11%	38%	12.5–16.6°C
May	43%	30%	11%	38%	18.2–22.8°C
June	68%	28%	10%	30%	23.6–27.0°C
July	75%	25%	10%	25%	26.3–30.0°C
August	74%	25%	10%	26%	25.9–28.6°C
September	61%	24%	11%	23%	21.4–24.9°C
October	25%	21%	10%	19%	15.0–19.5°C
November	3%	26%	11%	28%	9.1–13.5°C
December	<1%	29%	11%	35%	2.0–8.2°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.

1953Each stripe is one year’s mean temperature against the 69-year average. Warmest: 2024. Coolest: 1978.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4835395
NOAA station: USW00094745 · WESTCHESTER CO AP
Station distance: 7.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 41.03°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 24 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 WESTCHESTER CO AP is what differs

White Plains→Port Chester→Harrison→Rye→North Castle→Rye Brook→

Or put two places side by side: Greenwich vs White Plains

Best time to visitGreenwich.

September

July

May

The whole year,without the guesswork.

Greenwich runs +1.4°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Greenwich.

The whole year,
without the guesswork.

Greenwich runs +1.4°C
on the 1961–1990 baseline.

Nearby, measured,
and named.