United States · 1991–2020

Best time to visit
North Grosvenor Dale.

June leads for comfortable weather in North Grosvenor Dale: typically 24.9°C by day, 12.1°C at night, with 115 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high24.9°C

Typical low12.1°C

Rain in June115 mm

Comfort

June

June · September · August

76climate match

Beach

July

July · August · June

65climate match

Outdoors

May

May · September · June

76climate match

The weakest month is January, scoring 5 against June’s 76 — days reach only 2.1°C, 22° below the 24°C the score treats as ideal, and nights drop to -9.4°C.

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

52.1° / -9.4°

Feb

53.5° / -8.9°

Mar

57.6° / -4.5°

Apr

2614.6° / 1.1°

May

6020.5° / 7°

Jun

7624.9° / 12.1°

Jul

7228° / 15.6°

Aug

7427° / 14.4°

Sep

7523.1° / 10.3°

Oct

3816.6° / 3.4°

Nov

1210.4° / -1.4°

Dec

55.2° / -5.7°

Monthly climate evidence for North Grosvenor Dale — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.1°C	-9.4°C	103 mm	9.5	9 h 26	5	Strong coverage
February	3.5°C	-8.9°C	90 mm	7.9	10 h 31	5	Strong coverage
March	7.6°C	-4.5°C	106 mm	8.9	11 h 48	5	Strong coverage
April	14.6°C	1.1°C	119 mm	9.7	13 h 17	26	Strong coverage
May	20.5°C	7°C	86 mm	9.9	14 h 32	60	Strong coverage
June	24.9°C	12.1°C	115 mm	8.5	15 h 13	76	Strong coverage
July	28°C	15.6°C	100 mm	8.6	14 h 57	72	Strong coverage
August	27°C	14.4°C	110 mm	8	13 h 52	74	Strong coverage
September	23.1°C	10.3°C	105 mm	7.4	12 h 26	75	Strong coverage
October	16.6°C	3.4°C	119 mm	8.2	11 h	38	Strong coverage
November	10.4°C	-1.4°C	100 mm	8.1	9 h 45	12	Strong coverage
December	5.2°C	-5.7°C	118 mm	9.3	9 h 08	5	Strong coverage

What has changed

North Grosvenor Dale runs +0.3°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

+0.7

Feb

+0.9

Mar

+0.1

Apr

0.0

May

+0.2

Jun

-0.1

Jul

-0.1

Aug

-0.2

Sep

+0.6

Oct

+0.2

Nov

0.0

Dec

+1.3

June daytime highs, 2011–2025. Last recorded: 25.2°C.

Records at W THOMPSON LAKE, 1965–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.6°C13 Jan 2020	-30.6°C22 Jan 1984	84 mm26 Jan 1978	327 mm1979 · driest 17 mm in 1981	59
February	22.2°C25 Feb 2017	-29.4°C13 Feb 1967	63 mm14 Feb 2008	245 mm2008 · driest 13 mm in 1978	59
March	28.9°C31 Mar 1977	-26.1°C19 Mar 1967	91 mm22 Mar 1980	253 mm2024 · driest 9 mm in 2006	59
April	34.4°C20 Apr 1976	-16.7°C8 Apr 1982	101 mm14 Apr 2004	273 mm1987 · driest 30 mm in 1966	59
May	35.6°C24 May 1992	-4.4°C8 May 1968	67 mm27 May 2003	201 mm1984 · driest 6 mm in 2015	59
June	37.2°C30 Jun 2021	-2.8°C7 Jun 1993	114 mm8 Jun 2013	339 mm2006 · driest 6 mm in 1999	59
July	37.8°C19 Jul 1982	4.4°C7 Jul 1979	126 mm30 Jul 1980	348 mm2021 · driest 28 mm in 1970	57
August	37.8°C3 Aug 1975	1.7°C29 Aug 1986	121 mm20 Aug 1991	286 mm2011 · driest 10 mm in 1984	58
September	36.1°C12 Sep 1983	-1.7°C26 Sep 1967	130 mm2 Sep 2021	313 mm2018 · driest 17 mm in 1986	57
October	29.4°C1 Oct 1986	-10.0°C31 Oct 1966	154 mm15 Oct 2005	387 mm2005 · driest 8 mm in 1994	57
November	26.7°C3 Nov 1982	-18.9°C25 Nov 1989	67 mm21 Nov 1988	219 mm1988 · driest 15 mm in 2012	58
December	23.3°C8 Dec 1998	-28.9°C26 Dec 1980	107 mm12 Dec 2008	241 mm2020 · driest 26 mm in 1980	59

Typical days per month at W THOMPSON LAKE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	3	4
February	0	0	22	3	3
March	<1	0	22	4	3
April	2	<1	12	4	<1
May	7	2	2	3	0
June	16	4	0	4	0
July	26	9	0	3	0
August	22	6	0	4	0
September	10	1	<1	3	0
October	1	0	9	3	<1
November	0	0	17	3	<1
December	0	0	23	4	2

How often, not how much — every day in W THOMPSON LAKE’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%	30%	11%	35%	-1.4–4.5°C
February	<1%	28%	10%	31%	0.6–6.4°C
March	3%	29%	12%	36%	5.4–10.3°C
April	14%	32%	12%	42%	12.4–16.6°C
May	43%	33%	11%	44%	18.7–22.5°C
June	66%	30%	11%	34%	23.3–26.6°C
July	72%	28%	12%	29%	26.7–29.2°C
August	73%	26%	11%	25%	25.6–28.7°C
September	61%	24%	11%	25%	21.5–24.4°C
October	23%	26%	11%	26%	14.9–19.0°C
November	4%	29%	12%	37%	8.3–13.0°C
December	<1%	31%	13%	40%	2.0–7.5°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.

1966Each stripe is one year’s mean temperature against the 49-year average. Warmest: 2012. Coolest: 1978.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4839697
NOAA station: USC00069388 · W THOMPSON LAKE
Station distance: 4.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 41.99°, 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 W THOMPSON LAKE is what differs

Thompson→Putnam→South Woodstock→Quinebaug→Dayville→East Putnam→

Or put two places side by side: North Grosvenor Dale vs Thompson

Best time to visitNorth Grosvenor Dale.

June

July

May

The whole year,without the guesswork.

North Grosvenor Dale runs +0.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
North Grosvenor Dale.

The whole year,
without the guesswork.

North Grosvenor Dale runs +0.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.