United States · 1991–2020

Best time to visit
Jamestown.

September leads for comfortable weather in Jamestown: typically 25°C by day, 13.1°C at night, with 66 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25°C

Typical low13.1°C

Rain in September66 mm

Comfort

September

September · August · May

86climate match

Beach

July

July · August · June

72climate match

Outdoors

October

October · September · April

79climate match

The weakest month is January, scoring 5 against September’s 86 — days reach only 3°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° / -5.5°

Feb

55.2° / -4.1°

Mar

1710.9° / 0.6°

Apr

4618.1° / 6.2°

May

7122.9° / 11.7°

Jun

7027° / 16.3°

Jul

6628.4° / 17.9°

Aug

7427.7° / 16.7°

Sep

8625° / 13.1°

Oct

5918.8° / 7.2°

Nov

2511.7° / 1.9°

Dec

55.4° / -2.6°

Monthly climate evidence for Jamestown — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3°C	-5.5°C	87 mm	9.1	9 h 39	5	Strong coverage
February	5.2°C	-4.1°C	65 mm	7.7	10 h 38	5	Strong coverage
March	10.9°C	0.6°C	95 mm	8.7	11 h 49	17	Strong coverage
April	18.1°C	6.2°C	119 mm	10.8	13 h 11	46	Strong coverage
May	22.9°C	11.7°C	123 mm	10.5	14 h 20	71	Strong coverage
June	27°C	16.3°C	120 mm	9.5	14 h 57	70	Strong coverage
July	28.4°C	17.9°C	103 mm	8.7	14 h 43	66	Strong coverage
August	27.7°C	16.7°C	82 mm	6.9	13 h 44	74	Strong coverage
September	25°C	13.1°C	66 mm	5.8	12 h 24	86	Strong coverage
October	18.8°C	7.2°C	80 mm	7.1	11 h 05	59	Strong coverage
November	11.7°C	1.9°C	78 mm	8	9 h 56	25	Strong coverage
December	5.4°C	-2.6°C	83 mm	8.2	9 h 23	5	Strong coverage

What has changed

Jamestown runs +0.6°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

+0.9

Feb

+1.7

Mar

+0.7

Apr

+0.5

May

+0.2

Jun

+0.1

Jul

-0.1

Aug

-0.4

Sep

+0.8

Oct

+0.7

Nov

+0.4

Dec

+2.1

September daytime highs, 2011–2025. Last recorded: 27.2°C.

Records at XENIA 6 SSE, 1916–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.8°C25 Jan 1950	-33.3°C21 Jan 1984	120 mm21 Jan 1959	294 mm1937 · driest 5 mm in 1918	108
February	25.0°C20 Feb 2018	-28.9°C3 Feb 1985	88 mm14 Feb 1926	159 mm1926 · driest 3 mm in 1968	108
March	29.4°C23 Mar 2026	-20.6°C3 Mar 1980	79 mm6 Mar 1945	218 mm1945 · driest 13 mm in 1941	108
April	32.2°C30 Apr 2011	-10.6°C1 Apr 1923	90 mm19 Apr 1964	231 mm1964 · driest 21 mm in 1962	106
May	35.0°C29 May 1941	-3.9°C10 May 1966	87 mm24 May 1968	319 mm1968 · driest 13 mm in 1965	105
June	38.9°C29 Jun 1934	2.8°C11 Jun 1972	98 mm4 Jun 2008	217 mm1949 · driest 7 mm in 1933	108
July	42.2°C10 Jul 1936	5.6°C1 Jul 1988	135 mm4 Jul 1975	220 mm1980 · driest 18 mm in 1921	107
August	41.7°C19 Aug 1936	3.3°C29 Aug 1986	95 mm13 Aug 1944	276 mm1979 · driest 10 mm in 1924	107
September	39.4°C8 Sep 1939	-3.9°C24 Sep 1983	95 mm14 Sep 1979	202 mm1926 · driest 5 mm in 1925	106
October	33.3°C2 Oct 2019	-8.9°C21 Oct 1952	79 mm6 Oct 2013	160 mm1919 · driest 5 mm in 1924	106
November	28.9°C10 Nov 2020	-22.2°C30 Nov 1958	53 mm6 Nov 2017	257 mm1985 · driest 4 mm in 1917	107
December	23.3°C2 Dec 1982	-31.1°C22 Dec 1989	64 mm18 Dec 1990	223 mm1990 · driest 5 mm in 1919	108

Typical days per month at XENIA 6 SSE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	3	4
February	0	0	21	2	4
March	<1	0	16	4	1
April	4	<1	4	4	<1
May	12	2	<1	4	0
June	22	7	0	4	0
July	28	10	0	4	0
August	26	7	0	3	0
September	16	4	0	2	0
October	5	<1	3	3	<1
November	<1	0	12	3	<1
December	0	0	22	3	3

How often, not how much — every day in XENIA 6 SSE’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	<1%	27%	7%	27%	-0.8–6.5°C
February	<1%	26%	7%	28%	1.0–8.8°C
March	9%	29%	10%	33%	7.5–15.0°C
April	27%	33%	12%	42%	15.0–20.6°C
May	52%	32%	12%	40%	20.6–26.1°C
June	68%	31%	13%	37%	25.6–29.7°C
July	72%	28%	12%	30%	27.2–31.3°C
August	76%	24%	10%	23%	26.3–30.4°C
September	72%	21%	8%	17%	22.8–27.8°C
October	39%	22%	7%	21%	16.5–21.6°C
November	8%	27%	9%	27%	8.6–14.1°C
December	<1%	26%	8%	27%	1.4–8.7°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.

1918Each stripe is one year’s mean temperature against the 95-year average. Warmest: 2016. Coolest: 1978.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4515427
NOAA station: USC00339361 · XENIA 6 SSE
Station distance: 15.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 39.66°, 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 XENIA 6 SSE is what differs

Xenia→Cedarville→Wilberforce→Shawnee Hills→Harveysburg→Spring Valley→

Or put two places side by side: Jamestown vs Xenia

Best time to visitJamestown.