Canada · 1991–2020

Best time to visit
Grosse Isle.

August leads for comfortable weather in Grosse Isle: typically 25.5°C by day, 12.9°C at night, with 77 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high25.5°C

Typical low12.9°C

Rain in August77 mm

Comfort

August

August · July · June

81climate match

Beach

July

July · August · June

57climate match

Outdoors

September

September · May · June

85climate match

The weakest month is January, scoring 5 against August’s 81 — days reach only -11.1°C, 35° 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

5-11.1° / -20.8°

Feb

5-8.6° / -18.9°

Mar

5-0.6° / -10.9°

Apr

219.7° / -2°

May

5218° / 5.1°

Jun

7623.5° / 11.5°

Jul

8026.1° / 13.8°

Aug

8125.5° / 12.9°

Sep

6419.6° / 7.7°

Oct

2510.4° / 0.7°

Nov

50° / -8.2°

Dec

5-8.2° / -17.1°

Monthly climate evidence for Grosse Isle — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-11.1°C	-20.8°C	24 mm	6.9	8 h 30	5	Strong coverage
February	-8.6°C	-18.9°C	15 mm	5	9 h 59	5	Strong coverage
March	-0.6°C	-10.9°C	24 mm	4.8	11 h 42	5	Strong coverage
April	9.7°C	-2°C	29 mm	4.8	13 h 41	21	Strong coverage
May	18°C	5.1°C	66 mm	9.4	15 h 23	52	Strong coverage
June	23.5°C	11.5°C	97 mm	11.1	16 h 21	76	Strong coverage
July	26.1°C	13.8°C	80 mm	8.7	15 h 58	80	Strong coverage
August	25.5°C	12.9°C	77 mm	8.1	14 h 28	81	Strong coverage
September	19.6°C	7.7°C	59 mm	8	12 h 33	64	Strong coverage
October	10.4°C	0.7°C	44 mm	6.8	10 h 38	25	Strong coverage
November	0°C	-8.2°C	24 mm	5.4	8 h 57	5	Strong coverage
December	-8.2°C	-17.1°C	25 mm	6.7	8 h 05	5	Strong coverage

What has changed

Grosse Isle runs +1.2°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

+3.1

Feb

+0.2

Mar

+1.5

Apr

-1.5

May

-0.5

Jun

+1.5

Jul

+1.1

Aug

+1.4

Sep

+2.4

Oct

+0.4

Nov

+1.3

Dec

+3.0

August daytime highs, 2011–2023. Last recorded: 24.9°C.

Records at STONY MOUNTAIN, 1972–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	8.0°C31 Jan 2024	-42.2°C1 Jan 1974	22 mm7 Jan 1989	65 mm2004 · driest 0 mm in 2018	51
February	7.0°C22 Feb 2021	-42.5°C1 Feb 1996	20 mm25 Feb 2000	48 mm1987 · driest 2 mm in 2023	53
March	20.5°C18 Mar 2012	-38.5°C7 Mar 2008	34 mm27 Mar 2004	62 mm2004 · driest 0 mm in 2019	51
April	34.0°C21 Apr 1980	-27.2°C6 Apr 1979	40 mm30 Apr 1986	97 mm1986 · driest 0 mm in 1980	52
May	38.0°C22 May 1980	-11.5°C5 May 2008	60 mm29 May 2010	160 mm2022 · driest 8 mm in 1976	52
June	40.5°C19 Jun 2022	-2.0°C3 Jun 1985	88 mm3 Jun 2010	224 mm2014 · driest 25 mm in 1974	52
July	42.0°C31 Jul 2021	2.2°C2 Jul 1972	105 mm25 Jul 1993	222 mm1993 · driest 9 mm in 1976	50
August	38.5°C6 Aug 1988	0.6°C30 Aug 1978	90 mm14 Aug 1987	214 mm1985 · driest 11 mm in 1991	49
September	38.5°C2 Sep 1983	-6.5°C26 Sep 1985	64 mm1 Sep 2008	150 mm2019 · driest 7 mm in 2012	52
October	32.0°C5 Oct 2011	-20.0°C31 Oct 1991	82 mm11 Oct 1997	179 mm1997 · driest 1 mm in 1992	50
November	23.9°C5 Nov 1975	-39.0°C29 Nov 1985	28 mm8 Nov 1986	90 mm2000 · driest 0 mm in 2022	51
December	10.0°C7 Dec 2023	-39.0°C12 Dec 1995	31 mm30 Dec 2004	57 mm2000 · driest 3 mm in 2011	52

Typical days per month at STONY MOUNTAIN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	8
February	0	0	28	<1	6
March	0	0	29	<1	5
April	<1	0	20	<1	2
May	5	1	6	2	<1
June	13	3	0	3	0
July	21	5	0	2	0
August	18	6	0	2	0
September	6	<1	2	2	0
October	<1	<1	15	1	1
November	0	0	27	<1	6
December	0	0	31	<1	9

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 86); on 2011–2025 it is June (85). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in STONY MOUNTAIN’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%	19%	1%	18%	-17.1–-7.2°C
February	0%	15%	<1%	11%	-13.1–-3.9°C
March	<1%	14%	2%	10%	-5.5–4.0°C
April	9%	15%	3%	15%	5.0–14.5°C
May	35%	28%	6%	34%	15.3–22.3°C
June	54%	35%	10%	46%	20.8–26.1°C
July	70%	27%	6%	31%	24.5–28.3°C
August	68%	25%	7%	28%	22.4–27.8°C
September	38%	26%	6%	27%	16.4–21.5°C
October	8%	20%	4%	18%	7.7–12.9°C
November	<1%	17%	2%	16%	-4.2–3.8°C
December	0%	18%	1%	17%	-13.9–-3.9°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.

1972Each stripe is one year’s mean temperature against the 42-year average. Warmest: 1998. Coolest: 1972.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5967397
NOAA station: CA005022791 · STONY MOUNTAIN
Station distance: 20.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 50.06°, 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 STONY MOUNTAIN is what differs

West St. Paul→Stonewall→Blackdale→Emesville→Erinview→Less Crossing→

Or put two places side by side: Grosse Isle vs West St. Paul

Best time to visitGrosse Isle.