United States · 1991–2020

Best time to visit
Chester.

August leads for comfortable weather in Chester: typically 25.5°C by day, 14.7°C at night, with 105 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high25.5°C

Typical low14.7°C

Rain in August105 mm

Comfort

August

August · June · July

81climate match

Beach

July

July · August · June

62climate match

Outdoors

September

September · May · October

78climate match

The weakest month is January, scoring 5 against August’s 81 — days reach only -5.2°C, 29° 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

5-5.2° / -13.8°

Feb

5-2.9° / -11.8°

Mar

54.3° / -4.7°

Apr

2612.9° / 1.8°

May

5820° / 8.5°

Jun

7425.3° / 14.2°

Jul

7426.8° / 16.1°

Aug

8125.5° / 14.7°

Sep

7322.1° / 10.3°

Oct

4014.4° / 3.4°

Nov

55.3° / -3.5°

Dec

5-2.2° / -10.1°

Monthly climate evidence for Chester — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-5.2°C	-13.8°C	25 mm	5.5	9 h 14	5	Strong coverage
February	-2.9°C	-11.8°C	26 mm	5	10 h 24	5	Strong coverage
March	4.3°C	-4.7°C	51 mm	7.5	11 h 47	5	Strong coverage
April	12.9°C	1.8°C	89 mm	9.5	13 h 22	26	Strong coverage
May	20°C	8.5°C	111 mm	10.3	14 h 43	58	Strong coverage
June	25.3°C	14.2°C	136 mm	10	15 h 28	74	Strong coverage
July	26.8°C	16.1°C	107 mm	8.2	15 h 10	74	Strong coverage
August	25.5°C	14.7°C	105 mm	7.6	14 h 00	81	Strong coverage
September	22.1°C	10.3°C	92 mm	7.2	12 h 27	73	Strong coverage
October	14.4°C	3.4°C	62 mm	7.3	10 h 55	40	Strong coverage
November	5.3°C	-3.5°C	46 mm	6	9 h 34	5	Strong coverage
December	-2.2°C	-10.1°C	33 mm	6.4	8 h 54	5	Strong coverage

What has changed

Chester runs +0.9°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

+1.8

Feb

+0.1

Mar

+1.9

Apr

-0.6

May

+0.4

Jun

+0.8

Jul

-0.2

Aug

-0.1

Sep

+2.3

Oct

+0.6

Nov

+1.2

Dec

+2.6

August daytime highs, 2011–2025. Last recorded: 25.3°C.

Records at ROCHESTER INTL AP, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.4°C25 Jan 1944	-40.0°C30 Jan 1951	36 mm24 Jan 1967	65 mm1967 · driest 1 mm in 2025	110
February	20.6°C26 Feb 2024	-37.2°C2 Feb 1996	28 mm20 Feb 2014	76 mm2019 · driest 1 mm in 1964	111
March	27.8°C24 Mar 1910	-35.0°C1 Mar 1962	56 mm22 Mar 2011	102 mm1951 · driest 0 mm in 1910	111
April	33.3°C24 Apr 2009	-15.0°C6 Apr 1982	97 mm23 Apr 1990	185 mm2001 · driest 12 mm in 1946	111
May	41.1°C31 May 1934	-6.1°C3 May 1967	102 mm17 May 2000	311 mm2013 · driest 10 mm in 1934	111
June	40.6°C27 Jun 1934	-0.6°C9 Jun 1937	125 mm28 Jun 2019	318 mm2000 · driest 0 mm in 1910	112
July	42.2°C14 Jul 1936	4.4°C17 Jul 1911	190 mm11 Jul 1981	313 mm1978 · driest 10 mm in 1946	112
August	37.8°C3 Aug 1930	0.0°C30 Aug 1915	131 mm18 Aug 2007	358 mm2007 · driest 8 mm in 1941	111
September	37.8°C6 Sep 1913	-5.6°C28 Sep 1893	152 mm12 Sep 1978	267 mm1986 · driest 9 mm in 1953	111
October	33.9°C3 Oct 1997	-12.2°C23 Oct 1936	72 mm6 Oct 1911	232 mm1911 · driest 0 mm in 1893	111
November	25.0°C1 Nov 1893	-28.9°C26 Nov 1977	58 mm1 Nov 1991	150 mm1909 · driest 0 mm in 1917	111
December	17.8°C15 Dec 2021	-36.1°C19 Dec 1983	35 mm11 Dec 2010	94 mm2010 · driest 0 mm in 1943	110

Typical days per month at ROCHESTER INTL AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	9
February	0	0	27	<1	7
March	<1	0	24	2	6
April	1	<1	11	3	3
May	7	2	1	4	<1
June	18	4	0	4	0
July	23	6	0	4	0
August	19	3	0	4	0
September	10	2	<1	3	0
October	2	<1	9	2	<1
November	0	0	23	1	5
December	0	0	30	<1	9

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 83); on 2011–2025 it is August (85). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in ROCHESTER INTL 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%	15%	2%	11%	-10.0–-1.0°C
February	0%	15%	2%	10%	-6.8–1.5°C
March	2%	21%	4%	20%	0.0–8.5°C
April	14%	28%	8%	33%	9.5–16.5°C
May	39%	31%	11%	39%	17.5–23.3°C
June	62%	31%	13%	38%	23.1–28.1°C
July	74%	25%	11%	24%	25.4–30.3°C
August	73%	25%	10%	24%	24.4–29.0°C
September	52%	24%	9%	26%	19.9–24.5°C
October	22%	20%	6%	18%	12.2–18.3°C
November	2%	18%	5%	17%	1.4–8.8°C
December	0%	17%	2%	12%	-6.2–1.3°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.

1910Each stripe is one year’s mean temperature against the 106-year average. Warmest: 2012. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5020988
NOAA station: USW00014925 · ROCHESTER INTL AP
Station distance: 16.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 44.01°, 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 ROCHESTER INTL AP is what differs

Rochester→Stewartville→Eyota→Dover→Bobs Trailer Court→Cummingsville→

Or put two places side by side: Chester vs Rochester

Best time to visitChester.