United States · 1991–2020

Best time to visit
Chatham.

May leads for comfortable weather in Chatham: typically 24.4°C by day, 10°C at night, with 115 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high24.4°C

Typical low10°C

Rain in May115 mm

Comfort

May

May · September · June

73climate match

Beach

August

August · July · June

70climate match

Outdoors

October

October · April · May

76climate match

The weakest month is January, scoring 5 against May’s 73 — days reach only 8.5°C, 15° below the 24°C the score treats as ideal, and nights drop to -4.8°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

58.5° / -4.8°

Feb

1310.6° / -4°

Mar

2815.1° / -0.6°

Apr

5620.8° / 4.3°

May

7324.4° / 10°

Jun

7028.2° / 15.1°

Jul

5930.2° / 17.7°

Aug

6529.3° / 16.9°

Sep

7326° / 12.9°

Oct

6220.8° / 5.6°

Nov

3215.2° / -0.5°

Dec

810.1° / -3.2°

Monthly climate evidence for Chatham — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8.5°C	-4.8°C	104 mm	8.3	9 h 54	5	Strong coverage
February	10.6°C	-4°C	71 mm	7.3	10 h 47	13	Strong coverage
March	15.1°C	-0.6°C	102 mm	8.8	11 h 51	28	Strong coverage
April	20.8°C	4.3°C	98 mm	9	13 h 05	56	Strong coverage
May	24.4°C	10°C	115 mm	9.6	14 h 07	73	Strong coverage
June	28.2°C	15.1°C	109 mm	9.2	14 h 40	70	Strong coverage
July	30.2°C	17.7°C	107 mm	9.3	14 h 27	59	Strong coverage
August	29.3°C	16.9°C	105 mm	7.9	13 h 34	65	Strong coverage
September	26°C	12.9°C	127 mm	7.8	12 h 22	73	Strong coverage
October	20.8°C	5.6°C	88 mm	6.9	11 h 11	62	Strong coverage
November	15.2°C	-0.5°C	90 mm	7.1	10 h 09	32	Strong coverage
December	10.1°C	-3.2°C	94 mm	8.2	9 h 39	8	Strong coverage

What has changed

Chatham runs +0.0°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

+0.5

Feb

+1.7

Mar

+1.1

Apr

+0.7

May

-0.6

Jun

-0.7

Jul

-0.4

Aug

-1.2

Sep

-1.1

Oct

0.0

Nov

-0.5

Dec

+1.0

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

Records at CHATHAM, 1922–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C31 Jan 2002	-22.8°C21 Jan 1985	82 mm4 Jan 1992	244 mm1937 · driest 14 mm in 1981	102
February	27.8°C13 Feb 2017	-21.7°C20 Feb 2015	100 mm7 Feb 2020	197 mm2020 · driest 0 mm in 1947	100
March	31.1°C17 Mar 1945	-17.8°C15 Mar 1993	91 mm30 Mar 1975	289 mm1975 · driest 7 mm in 2006	103
April	34.4°C25 Apr 1925	-8.3°C10 Apr 1985	120 mm16 Apr 1987	242 mm1987 · driest 18 mm in 1942	102
May	37.2°C31 May 1982	-3.9°C4 May 1986	113 mm13 May 1971	272 mm1971 · driest 13 mm in 1997	104
June	39.4°C30 Jun 1945	0.6°C8 Jun 1977	95 mm22 Jun 1931	296 mm1995 · driest 21 mm in 1925	104
July	40.6°C21 Jul 1926	1.7°C7 Jul 1983	94 mm2 Jul 2021	229 mm1946 · driest 13 mm in 1983	104
August	40.6°C5 Aug 1930	3.3°C31 Aug 1976	164 mm31 Aug 1964	321 mm1942 · driest 7 mm in 2007	104
September	40.0°C7 Sep 1954	-3.3°C25 Sep 1983	222 mm4 Sep 1996	483 mm1944 · driest 5 mm in 1933	104
October	37.2°C4 Oct 2019	-7.2°C21 Oct 1992	152 mm3 Oct 1927	282 mm1990 · driest 0 mm in 2000	104
November	30.0°C8 Nov 2024	-12.2°C25 Nov 1956	91 mm27 Nov 2013	250 mm1985 · driest 8 mm in 2021	104
December	26.1°C8 Dec 1998	-19.4°C25 Dec 1983	113 mm29 Dec 1958	191 mm1967 · driest 10 mm in 1965	102

Typical days per month at CHATHAM, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	4	1
February	<1	0	23	2	<1
March	3	<1	18	4	<1
April	9	1	8	4	0
May	16	4	<1	4	0
June	25	11	0	3	0
July	30	19	0	4	0
August	29	14	0	3	0
September	19	6	<1	4	0
October	7	<1	6	3	0
November	1	0	19	3	0
December	<1	0	24	3	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 77); on 2011–2025 it is September (80). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in CHATHAM’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	3%	28%	11%	29%	5.8–11.4°C
February	6%	29%	10%	34%	7.4–13.5°C
March	19%	30%	12%	32%	12.1–18.1°C
April	44%	29%	11%	30%	18.9–23.2°C
May	62%	32%	12%	37%	23.3–27.3°C
June	70%	30%	11%	34%	27.2–30.9°C
July	69%	32%	13%	37%	29.3–32.7°C
August	72%	28%	11%	28%	28.1–31.9°C
September	73%	25%	10%	24%	24.9–29.4°C
October	52%	22%	9%	21%	19.2–23.2°C
November	20%	24%	9%	22%	12.9–18.0°C
December	4%	26%	10%	27%	7.5–13.2°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.

1924Each stripe is one year’s mean temperature against the 91-year average. Warmest: 1931. Coolest: 1988.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4752060
NOAA station: USC00441614 · CHATHAM
Station distance: 1.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 36.83°, 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 CHATHAM is what differs

Gretna→Motley→Ridgeway→Ajax→Andersons Mill→Banister→

Or put two places side by side: Chatham vs Gretna

Best time to visitChatham.

May

August

October

The whole year,without the guesswork.

Chatham runs +0.0°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Chatham.

The whole year,
without the guesswork.

Chatham runs +0.0°C
on the 1961–1990 baseline.

Nearby, measured,
and named.