United States · 1991–2020

Best time to visit
Jamestown.

September leads for comfortable weather in Jamestown: typically 27°C by day, 13.7°C at night, with 71 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27°C

Typical low13.7°C

Rain in September71 mm

Comfort

September

September · May · October

80climate match

Beach

August

August · June · July

73climate match

Outdoors

October

October · April · May

89climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only 3.8°C, 20° 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

53.8° / -7.2°

Feb

56.4° / -5.4°

Mar

3413° / -0.1°

Apr

5718.4° / 5.2°

May

7723.8° / 11.3°

Jun

6330.1° / 17.2°

Jul

4932.5° / 19.8°

Aug

5931.1° / 18.5°

Sep

8027° / 13.7°

Oct

6719.8° / 6.6°

Nov

3211.7° / -0.3°

Dec

55.1° / -5.5°

Monthly climate evidence for Jamestown — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.8°C	-7.2°C	17 mm	3	9 h 39	5	Strong coverage
February	6.4°C	-5.4°C	22 mm	3.4	10 h 38	5	Strong coverage
March	13°C	-0.1°C	39 mm	5.2	11 h 49	34	Strong coverage
April	18.4°C	5.2°C	64 mm	6.6	13 h 11	57	Strong coverage
May	23.8°C	11.3°C	110 mm	8.8	14 h 20	77	Strong coverage
June	30.1°C	17.2°C	97 mm	8.1	14 h 57	63	Strong coverage
July	32.5°C	19.8°C	105 mm	7.5	14 h 42	49	Strong coverage
August	31.1°C	18.5°C	89 mm	7.5	13 h 43	59	Strong coverage
September	27°C	13.7°C	71 mm	5.8	12 h 24	80	Strong coverage
October	19.8°C	6.6°C	50 mm	4.9	11 h 05	67	Strong coverage
November	11.7°C	-0.3°C	30 mm	3.5	9 h 56	32	Strong coverage
December	5.1°C	-5.5°C	26 mm	3.3	9 h 23	5	Strong coverage

What has changed

Jamestown 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

+1.9

Feb

+1.2

Mar

+2.5

Apr

+0.9

May

+0.8

Jun

+2.1

Jul

-0.3

Aug

-0.2

Sep

+2.3

Oct

+0.9

Nov

+2.0

Dec

+2.6

September daytime highs, 2011–2025. Last recorded: 28.1°C.

Records at CONCORDIA ASOS, 1885–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C10 Jan 1911	-36.1°C8 Jan 1886	36 mm26 Jan 1944	55 mm1891 · driest 0 mm in 1997	127
February	30.0°C29 Feb 1972	-31.7°C12 Feb 1899	46 mm27 Feb 1948	81 mm1911 · driest 0 mm in 1996	127
March	36.1°C21 Mar 1907	-23.9°C11 Mar 1948	67 mm23 Mar 1987	211 mm1987 · driest 0 mm in 1920	127
April	37.8°C20 Apr 1902	-11.0°C7 Apr 2018	75 mm24 Apr 1904	152 mm1984 · driest 9 mm in 1989	127
May	38.9°C29 May 1913	-4.4°C1 May 1909	120 mm24 May 1970	334 mm1903 · driest 7 mm in 1966	129
June	42.8°C26 Jun 1936	5.0°C1 Jun 1964	129 mm9 Jun 1967	359 mm1967 · driest 15 mm in 1931	129
July	45.6°C13 Jul 1934	7.8°C9 Jul 1895	106 mm23 Jul 1889	425 mm1993 · driest 1 mm in 1919	129
August	46.7°C12 Aug 1936	5.0°C23 Aug 1891	112 mm2 Aug 2013	273 mm1977 · driest 8 mm in 1947	128
September	44.4°C3 Sep 1947	-1.7°C22 Sep 1995	116 mm6 Sep 1946	227 mm1946 · driest 3 mm in 1947	128
October	38.9°C5 Oct 1947	-10.0°C31 Oct 1993	103 mm30 Oct 1979	149 mm1941 · driest 1 mm in 1999	128
November	29.4°C8 Nov 2006	-26.1°C27 Nov 1887	66 mm1 Nov 1998	124 mm1971 · driest 0 mm in 1989	128
December	27.8°C23 Dec 1964	-32.2°C22 Dec 1989	63 mm15 Dec 1984	99 mm1913 · driest 0 mm in 1901	128

Typical days per month at CONCORDIA ASOS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	3
February	<1	0	23	<1	3
March	2	<1	17	1	1
April	5	<1	5	2	<1
May	14	4	<1	4	<1
June	26	17	0	3	0
July	30	23	0	4	0
August	29	19	0	3	0
September	21	10	0	2	0
October	7	2	4	2	<1
November	<1	0	16	<1	1
December	0	0	28	<1	3

How often, not how much — every day in CONCORDIA ASOS’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%	11%	1%	5%	-1.5–7.2°C
February	4%	12%	2%	7%	0.8–10.2°C
March	18%	16%	4%	14%	7.3–15.9°C
April	38%	22%	7%	22%	15.7–21.3°C
May	57%	29%	11%	35%	20.9–26.1°C
June	71%	27%	11%	31%	26.4–32.2°C
July	77%	23%	9%	23%	30.0–35.3°C
August	78%	22%	9%	22%	29.0–34.1°C
September	74%	20%	7%	17%	24.5–29.9°C
October	50%	15%	5%	12%	17.3–22.9°C
November	12%	11%	3%	6%	8.2–14.7°C
December	1%	10%	2%	6%	1.3–8.5°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.

1886Each stripe is one year’s mean temperature against the 126-year average. Warmest: 2024. Coolest: 1993.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4273545
NOAA station: USW00013984 · CONCORDIA ASOS
Station distance: 18.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 39.60°, 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 CONCORDIA ASOS is what differs

Concordia→Macyville→Yuma→Double J Mobile Home Park→

Or put two places side by side: Jamestown vs Concordia

Best time to visitJamestown.