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Canada · 1991–2020

Best time to visit
Belfast.

July leads for comfortable weather in Belfast: typically 24.3°C by day, 15.2°C at night, with 96 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high24.3°C

Typical low15.2°C

Rain in July96 mm

Comfort

July

July · August · June

84climate match

Beach

July

July · August · June

52climate match

Outdoors

June

June · September · July

79climate match

The weakest month is January, scoring 5 against July’s 84 — days reach only -2°C, 26° 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

5-2° / -9.8°

Feb

5-1.8° / -9.7°

Mar

52° / -5.6°

Apr

57.8° / -0.3°

May

3714.9° / 5.1°

Jun

6220° / 10.4°

Jul

8424.3° / 15.2°

Aug

8324° / 15.1°

Sep

6119.8° / 11.5°

Oct

2613.2° / 6.3°

Nov

57.4° / 1°

Dec

51.8° / -4.7°

Monthly climate evidence for Belfast — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 19 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-2°C	-9.8°C	93 mm	13.3	-0.4°C	9 h 00	5	Good coverage
February	-1.8°C	-9.7°C	95 mm	11.4	-0.9°C	10 h 16	5	Good coverage
March	2°C	-5.6°C	88 mm	10.8	-0.7°C	11 h 45	5	Good coverage
April	7.8°C	-0.3°C	93 mm	11.9	0.8°C	13 h 28	5	Good coverage
May	14.9°C	5.1°C	87 mm	11.6	4.7°C	14 h 56	37	Good coverage
June	20°C	10.4°C	102 mm	10.7	11.4°C	15 h 44	62	Good coverage
July	24.3°C	15.2°C	96 mm	9.4	16.9°C	15 h 25	84	Good coverage
August	24°C	15.1°C	106 mm	10	18.7°C	14 h 09	83	Good coverage
September	19.8°C	11.5°C	126 mm	9.9	16.7°C	12 h 29	61	Good coverage
October	13.2°C	6.3°C	132 mm	12.9	13.0°C	10 h 50	26	Good coverage
November	7.4°C	1°C	122 mm	13.3	7.8°C	9 h 22	5	Good coverage
December	1.8°C	-4.7°C	132 mm	14.6	2.2°C	8 h 39	5	Good coverage

Records at ALLISTON, 1936–2016
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.0°C24 Jan 1999	-26.1°C16 Jan 1957	47 mm28 Jan 2008	225 mm1956 · driest 15 mm in 1940	69
February	15.0°C28 Feb 2000	-26.7°C11 Feb 1948	64 mm26 Feb 1979	208 mm2015 · driest 23 mm in 1949	69
March	24.5°C22 Mar 2012	-27.8°C4 Mar 1938	58 mm30 Mar 2014	177 mm2014 · driest 23 mm in 1946	68
April	27.0°C28 Apr 2009	-15.0°C5 Apr 1995	60 mm27 Apr 2001	160 mm2006 · driest 11 mm in 1966	68
May	30.6°C24 May 1977	-6.7°C3 May 1945	54 mm1 May 1947	165 mm1967 · driest 16 mm in 1950	68
June	32.8°C29 Jun 1944	-3.9°C1 Jun 1943	86 mm8 Jun 2013	207 mm2010 · driest 19 mm in 1942	68
July	33.9°C19 Jul 1975	2.0°C14 Jul 1979	76 mm23 Jul 2003	203 mm1979 · driest 11 mm in 1968	68
August	36.1°C12 Aug 1944	4.4°C19 Aug 1976	128 mm15 Aug 1971	340 mm2008 · driest 13 mm in 1947	67
September	32.5°C2 Sep 2010	-0.6°C29 Sep 1947	109 mm5 Sep 2012	409 mm2012 · driest 14 mm in 1971	68
October	26.5°C1 Oct 2010	-6.1°C27 Oct 1936	74 mm7 Oct 2009	266 mm2011 · driest 17 mm in 1948	68
November	21.1°C6 Nov 1959	-13.3°C20 Nov 1936	54 mm11 Nov 2011	254 mm1968 · driest 28 mm in 1947	68
December	17.8°C5 Dec 1950	-23.9°C20 Dec 1942	71 mm3 Dec 2013	228 mm1979 · driest 15 mm in 1942	68

Typical days per month at ALLISTON, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	3	12
February	0	0	27	4	11
March	0	0	28	3	9
April	<1	0	19	3	4
May	1	0	2	3	<1
June	5	<1	0	3	0
July	15	1	0	3	0
August	13	2	0	3	0
September	3	<1	0	4	0
October	0	0	1	4	0
November	0	0	13	4	3
December	0	0	26	5	10

How often, not how much — every day in ALLISTON’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%	36%	10%	47%	-5.1–0.2°C
February	0%	33%	10%	44%	-4.8–0.0°C
March	<1%	32%	8%	40%	-0.8–4.0°C
April	2%	35%	9%	47%	4.8–9.6°C
May	15%	35%	9%	46%	12.4–17.0°C
June	40%	33%	9%	43%	18.3–21.7°C
July	66%	29%	8%	32%	22.5–26.2°C
August	63%	29%	9%	36%	21.7–25.6°C
September	33%	32%	10%	42%	17.6–21.0°C
October	6%	37%	12%	49%	11.2–14.8°C
November	<1%	41%	13%	59%	5.1–9.1°C
December	0%	41%	13%	59%	-1.4–3.9°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.

1936Each stripe is one year’s mean temperature against the 62-year average. Warmest: 2010. Coolest: 1965.2015

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5897681
NOAA station: CA008300100 · ALLISTON
Station distance: 21.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 46.08°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 19 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 ALLISTON is what differs

Three Rivers→Montague→Georgetown→Murray River→Abney→Albion→

Or put two places side by side: Belfast vs Three Rivers

Best time to visitBelfast.

July

July

June

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Belfast.

The whole year,
without the guesswork.

Nearby, measured,
and named.