Canada · 1991–2020

Best time to visit
Châteauguay.

June leads for comfortable weather in Châteauguay: typically 24.2°C by day, 13.8°C at night, with 93 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high24.2°C

Typical low13.8°C

Rain in June93 mm

Comfort

June

June · August · July

83climate match

Beach

July

July · August · June

61climate match

Outdoors

May

May · September · June

78climate match

The weakest month is January, scoring 5 against June’s 83 — days reach only -5°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° / -13.6°

Feb

5-3.5° / -12.4°

Mar

52.6° / -6.3°

Apr

1911.4° / 1.1°

May

5919.4° / 8.4°

Jun

8324.2° / 13.8°

Jul

7426.3° / 16.5°

Aug

8125.6° / 15.4°

Sep

7121.3° / 10.9°

Oct

3113.3° / 4.5°

Nov

56.3° / -1.5°

Dec

5-0.9° / -8.3°

Monthly climate evidence for Châteauguay — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-5°C	-13.6°C	81 mm	10.9	9 h 05	5	Strong coverage
February	-3.5°C	-12.4°C	64 mm	9.3	10 h 19	5	Strong coverage
March	2.6°C	-6.3°C	73 mm	10.2	11 h 46	5	Strong coverage
April	11.4°C	1.1°C	92 mm	10.1	13 h 26	19	Strong coverage
May	19.4°C	8.4°C	87 mm	10.4	14 h 51	59	Strong coverage
June	24.2°C	13.8°C	93 mm	9.9	15 h 39	83	Strong coverage
July	26.3°C	16.5°C	94 mm	10.8	15 h 20	74	Strong coverage
August	25.6°C	15.4°C	91 mm	8.6	14 h 06	81	Strong coverage
September	21.3°C	10.9°C	87 mm	9.3	12 h 28	71	Strong coverage
October	13.3°C	4.5°C	96 mm	10.2	10 h 52	31	Strong coverage
November	6.3°C	-1.5°C	82 mm	10.5	9 h 26	5	Strong coverage
December	-0.9°C	-8.3°C	94 mm	12.1	8 h 44	5	Strong coverage

Records at MONTREAL/PIERRE ELLIOTT TRUDEA, 1941–2016
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	13.9°C25 Jan 1950	-37.8°C15 Jan 1957	47 mm18 Jan 2006	153 mm1998 · driest 19 mm in 1981	75
February	15.0°C22 Feb 1981	-33.9°C15 Feb 1943	43 mm1 Feb 2008	175 mm1960 · driest 8 mm in 1978	75
March	25.8°C21 Mar 2012	-29.4°C4 Mar 1950	43 mm22 Mar 2001	165 mm1955 · driest 15 mm in 1967	75
April	30.0°C27 Apr 1990	-15.0°C4 Apr 1954	48 mm23 Apr 2006	178 mm1996 · driest 14 mm in 2001	75
May	34.7°C26 May 2010	-4.4°C2 May 1974	46 mm19 May 2006	175 mm1945 · driest 15 mm in 1982	75
June	35.0°C30 Jun 1964	0.7°C3 Jun 1986	67 mm21 Jun 1997	216 mm1943 · driest 19 mm in 1965	74
July	35.6°C22 Jul 1955	6.1°C3 Jul 1982	64 mm5 Jul 2005	183 mm1980 · driest 30 mm in 1989	74
August	37.6°C1 Aug 1975	3.3°C28 Aug 1957	74 mm31 Aug 2005	225 mm2011 · driest 1 mm in 1957	75
September	33.5°C3 Sep 2010	-2.2°C30 Sep 1951	82 mm14 Sep 1979	228 mm1975 · driest 11 mm in 1948	76
October	28.3°C2 Oct 1968	-7.2°C20 Oct 1972	81 mm6 Oct 1995	198 mm2005 · driest 14 mm in 1963	75
November	21.7°C6 Nov 1948	-19.4°C27 Nov 1949	94 mm8 Nov 1996	190 mm1983 · driest 14 mm in 2012	75
December	18.0°C6 Dec 2001	-32.4°C25 Dec 1980	51 mm11 Dec 2003	165 mm2012 · driest 16 mm in 1992	75

Typical days per month at MONTREAL/PIERRE ELLIOTT TRUDEA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	3	15
February	0	0	27	2	13
March	0	0	26	2	10
April	<1	0	11	3	3
May	5	<1	<1	3	0
June	13	3	0	3	0
July	20	4	0	3	0
August	18	3	0	3	0
September	6	<1	<1	3	0
October	<1	0	5	3	<1
November	0	0	18	2	5
December	0	0	27	3	13

How often, not how much — every day in MONTREAL/PIERRE ELLIOTT TRUDEA’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%	37%	7%	51%	-9.2–-2.0°C
February	0%	34%	7%	50%	-7.0–-1.2°C
March	<1%	32%	7%	43%	-0.6–5.0°C
April	7%	33%	9%	41%	8.6–13.4°C
May	31%	33%	8%	42%	16.3–21.6°C
June	58%	32%	10%	42%	22.1–25.4°C
July	67%	32%	10%	39%	24.8–27.7°C
August	67%	29%	10%	34%	23.5–27.1°C
September	38%	30%	9%	38%	18.3–23.0°C
October	9%	32%	8%	43%	11.0–15.4°C
November	<1%	38%	9%	52%	3.3–8.2°C
December	0%	40%	9%	59%	-5.8–1.3°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.

1942Each stripe is one year’s mean temperature against the 74-year average. Warmest: 1998. Coolest: 1978.2015

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5920433
NOAA station: CA007025250 · MONTREAL/PIERRE ELLIOTT TRUDEA
Station distance: 9.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 45.38°, 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 MONTREAL/PIERRE ELLIOTT TRUDEA is what differs

Chomedey→Cartierville→Bordeaux→Châteauguay-Centre→Lakeside Heights→L'An-Deux-Mille→

Or put two places side by side: Châteauguay vs Chomedey

Best time to visitChâteauguay.

June

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Châteauguay.

The whole year,
without the guesswork.

Nearby, measured,
and named.