United States · 1991–2020

Best time to visit
Sumner.

August leads for comfortable weather in Sumner: typically 24.5°C by day, 12.2°C at night, with 103 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high24.5°C

Typical low12.2°C

Rain in August103 mm

Comfort

August

August · July · September

78climate match

Beach

July

July · August · September

47climate match

Outdoors

September

September · June · May

79climate match

The weakest month is January, scoring 5 against August’s 78 — days reach only -3.4°C, 27° 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

5-3.4° / -13°

Feb

5-1.7° / -12.2°

Mar

52.9° / -7.5°

Apr

810.3° / -0.9°

May

4417.5° / 5.4°

Jun

6121.8° / 10.3°

Jul

7725° / 13.2°

Aug

7824.5° / 12.2°

Sep

6420.8° / 8°

Oct

1813.2° / 2.3°

Nov

56.3° / -3°

Dec

5-0.1° / -8.7°

Monthly climate evidence for Sumner — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3.4°C	-13°C	88 mm	9.1	9 h 11	5	Good coverage
February	-1.7°C	-12.2°C	92 mm	8.5	10 h 22	5	Good coverage
March	2.9°C	-7.5°C	104 mm	8.7	11 h 46	5	Good coverage
April	10.3°C	-0.9°C	121 mm	9.7	13 h 24	8	Good coverage
May	17.5°C	5.4°C	104 mm	11.4	14 h 46	44	Good coverage
June	21.8°C	10.3°C	141 mm	12	15 h 31	61	Good coverage
July	25°C	13.2°C	105 mm	10	15 h 13	77	Good coverage
August	24.5°C	12.2°C	103 mm	9.3	14 h 02	78	Good coverage
September	20.8°C	8°C	95 mm	7.5	12 h 28	64	Good coverage
October	13.2°C	2.3°C	157 mm	10	10 h 54	18	Good coverage
November	6.3°C	-3°C	116 mm	9.1	9 h 32	5	Good coverage
December	-0.1°C	-8.7°C	124 mm	10.5	8 h 51	5	Good coverage

Records at HARTFORD, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.6°C9 Jan 2008	-28.9°C14 Jan 2004	67 mm13 Jan 2018	179 mm1999 · driest 14 mm in 2004	28
February	17.8°C22 Feb 2018	-29.4°C15 Feb 2003	69 mm26 Feb 2010	183 mm2008 · driest 20 mm in 2024	28
March	26.7°C22 Mar 2012	-27.8°C4 Mar 2003	64 mm7 Mar 2011	243 mm2024 · driest 32 mm in 2006	28
April	31.7°C29 Apr 2009	-12.8°C1 Apr 2003	89 mm17 Apr 2007	286 mm2007 · driest 13 mm in 1999	28
May	32.8°C19 May 2017	-3.3°C1 May 2008	110 mm1 May 2023	216 mm2005 · driest 27 mm in 2015	29
June	33.9°C25 Jun 2025	-1.1°C1 Jun 2020	127 mm14 Jun 1998	435 mm1998 · driest 25 mm in 2021	29
July	32.8°C23 Jul 2011	5.6°C20 Jul 2000	71 mm24 Jul 2013	210 mm2000 · driest 27 mm in 2012	29
August	33.9°C10 Aug 2001	3.9°C20 Aug 2007	100 mm29 Aug 2011	220 mm2008 · driest 24 mm in 2025	28
September	33.3°C10 Sep 2002	-3.9°C30 Sep 2000	142 mm17 Sep 1999	267 mm1999 · driest 20 mm in 2014	27
October	28.3°C11 Oct 2018	-7.2°C31 Oct 2002	102 mm11 Oct 1998	326 mm2005 · driest 25 mm in 2013	28
November	23.3°C6 Nov 2022	-17.2°C22 Nov 2018	93 mm26 Nov 2008	195 mm2008 · driest 26 mm in 2012	28
December	17.2°C8 Dec 1998	-23.9°C30 Dec 2017	88 mm13 Dec 2010	262 mm2023 · driest 48 mm in 1998	28

Typical days per month at HARTFORD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	3	10
February	0	0	28	3	9
March	<1	0	29	4	8
April	<1	0	19	4	3
May	4	<1	3	4	<1
June	9	2	0	4	0
July	18	3	0	3	0
August	15	2	0	3	0
September	5	<1	<1	3	0
October	<1	0	11	4	<1
November	0	0	23	4	4
December	0	0	30	4	9

How often, not how much — every day in HARTFORD’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%	30%	10%	35%	-5.6–-0.6°C
February	0%	29%	11%	37%	-3.8–0.4°C
March	<1%	29%	12%	36%	0.7–5.4°C
April	6%	34%	13%	49%	8.8–12.6°C
May	29%	36%	12%	45%	15.4–20.1°C
June	49%	40%	14%	54%	20.0–23.6°C
July	65%	33%	11%	40%	22.6–26.7°C
August	66%	31%	11%	35%	23.2–26.1°C
September	48%	25%	10%	28%	19.6–22.3°C
October	11%	32%	13%	40%	11.3–15.8°C
November	1%	30%	11%	37%	4.4–8.8°C
December	0%	34%	14%	44%	-2.7–2.8°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.

1999Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2023. Coolest: 2003.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4980182
NOAA station: USC00173570 · HARTFORD
Station distance: 9.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 44.39°, 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 HARTFORD is what differs

Paris→Livermore→Canton→Hartford→Canton Point→East Sumner→

Or put two places side by side: Sumner vs Paris

Best time to visitSumner.