United States · 1991–2020

Best time to visit
Little Union.

September leads for comfortable weather in Little Union: typically 26.4°C by day, 14.1°C at night, with 78 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.4°C

Typical low14.1°C

Rain in September78 mm

Comfort

September

September · May · June

83climate match

Beach

August

August · July · June

79climate match

Outdoors

October

October · April · May

82climate match

The weakest month is January, scoring 5 against September’s 83 — days reach only 1.9°C, 22° 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

51.9° / -7.3°

Feb

54.7° / -5.3°

Mar

2310.9° / 0°

Apr

5118° / 6.2°

May

7623.5° / 12.3°

Jun

6528.7° / 17.7°

Jul

5830.6° / 19.7°

Aug

6529.8° / 18.7°

Sep

8326.4° / 14.1°

Oct

6119.1° / 7.4°

Nov

2711.4° / 0.9°

Dec

54.5° / -4.4°

Monthly climate evidence for Little Union — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.9°C	-7.3°C	41 mm	5.2	9 h 38	5	Strong coverage
February	4.7°C	-5.3°C	46 mm	4.9	10 h 38	5	Strong coverage
March	10.9°C	0°C	62 mm	6.6	11 h 49	23	Strong coverage
April	18°C	6.2°C	97 mm	8.4	13 h 12	51	Strong coverage
May	23.5°C	12.3°C	118 mm	9.1	14 h 21	76	Strong coverage
June	28.7°C	17.7°C	112 mm	7.8	14 h 59	65	Strong coverage
July	30.6°C	19.7°C	93 mm	7.3	14 h 44	58	Strong coverage
August	29.8°C	18.7°C	85 mm	6	13 h 44	65	Strong coverage
September	26.4°C	14.1°C	78 mm	5.1	12 h 24	83	Strong coverage
October	19.1°C	7.4°C	75 mm	6.6	11 h 05	61	Strong coverage
November	11.4°C	0.9°C	59 mm	6	9 h 55	27	Strong coverage
December	4.5°C	-4.4°C	45 mm	5.3	9 h 22	5	Strong coverage

Records at QUINCY DAM 21, 1937–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.1°C19 Jan 1996	-29.4°C15 Jan 1979	67 mm30 Jan 1982	86 mm1941 · driest 2 mm in 1984	55
February	26.1°C28 Feb 2024	-27.2°C9 Feb 1982	83 mm21 Feb 1997	137 mm1997 · driest 0 mm in 1947	56
March	32.8°C22 Mar 2026	-24.4°C5 Mar 1978	49 mm15 Mar 1990	153 mm1945 · driest 9 mm in 2014	57
April	33.3°C26 Apr 1986	-11.1°C3 Apr 2018	87 mm11 Apr 1944	211 mm1944 · driest 10 mm in 2018	57
May	36.7°C24 May 1939	0.6°C4 May 2005	93 mm20 May 2025	302 mm1991 · driest 22 mm in 2005	57
June	39.4°C25 Jun 1937	7.2°C6 Jun 1993	89 mm11 Jun 2026	293 mm2015 · driest 16 mm in 1991	55
July	40.6°C25 Jul 2005	11.1°C6 Jul 1983	154 mm1 Jul 1993	284 mm1981 · driest 5 mm in 1940	56
August	40.6°C27 Aug 2003	8.9°C30 Aug 1988	116 mm8 Aug 1943	305 mm1970 · driest 3 mm in 1947	58
September	39.4°C2 Sep 2011	-1.1°C25 Sep 1937	100 mm24 Sep 1977	255 mm1977 · driest 2 mm in 1979	56
October	36.1°C8 Oct 1939	-5.6°C24 Oct 1981	85 mm18 Oct 1946	238 mm1941 · driest 18 mm in 1992	54
November	30.6°C4 Nov 1940	-16.1°C9 Nov 1991	61 mm30 Nov 2006	241 mm1985 · driest 3 mm in 2002	57
December	24.4°C16 Dec 2021	-27.8°C26 Dec 1983	95 mm3 Dec 1982	214 mm1982 · driest 2 mm in 2017	55

Typical days per month at QUINCY DAM 21, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	1	2
February	0	0	22	2	2
March	<1	0	16	2	<1
April	5	<1	3	3	<1
May	13	3	0	4	0
June	24	12	0	4	0
July	28	18	0	3	0
August	28	15	0	3	0
September	18	8	0	2	0
October	7	1	2	3	0
November	<1	0	14	2	<1
December	0	0	24	2	1

How often, not how much — every day in QUINCY DAM 21’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%	17%	4%	12%	-2.2–4.9°C
February	2%	18%	5%	14%	-0.4–8.4°C
March	11%	24%	8%	26%	7.2–15.4°C
April	28%	29%	11%	36%	15.2–21.1°C
May	55%	28%	12%	32%	21.0–25.6°C
June	71%	26%	12%	29%	26.9–30.2°C
July	77%	23%	10%	22%	29.2–32.3°C
August	79%	20%	9%	17%	28.0–31.9°C
September	75%	19%	9%	18%	24.1–28.6°C
October	42%	21%	8%	20%	17.3–22.8°C
November	10%	19%	6%	16%	8.0–15.1°C
December	<1%	18%	5%	16%	1.2–7.9°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.

1938Each stripe is one year’s mean temperature against the 41-year average. Warmest: 2012. Coolest: 1978.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4049266
NOAA station: USC00117077 · QUINCY DAM 21
Station distance: 20.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 39.83°, 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 QUINCY DAM 21 is what differs

Quincy→Palmyra→Calftown (historical)→Cherry Lane Estates→Cheshire Hills→Country Meadows→

Or put two places side by side: Little Union vs Quincy

Best time to visitLittle Union.