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Canada · 1991–2020

Best time to visit
Halfmoon Bay.

July leads for comfortable weather in Halfmoon Bay: typically 22.1°C by day, 15.3°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high22.1°C

Typical low15.3°C

Rain in July27 mm

Comfort

July

July · August · June

92climate match

Beach

July

July · August · June

62climate match

Outdoors

June

June · July · August

84climate match

The weakest month is January, scoring 5 against July’s 92 — days reach only 7.1°C, 17° 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

57.1° / 3.6°

Feb

117.7° / 3.6°

Mar

179.7° / 4.9°

Apr

3612.7° / 7.1°

May

6016.8° / 10.3°

Jun

7519.5° / 13.1°

Jul

9222.1° / 15.3°

Aug

9021.8° / 15.5°

Sep

7118.5° / 12.7°

Oct

3413.2° / 8.9°

Nov

79.4° / 5.8°

Dec

57.2° / 3.8°

Monthly climate evidence for Halfmoon Bay — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 16 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	7.1°C	3.6°C	138 mm	16.2	6.8°C	8 h 35	5	Strong coverage
February	7.7°C	3.6°C	82 mm	12	7.0°C	10 h 02	11	Strong coverage
March	9.7°C	4.9°C	89 mm	14.2	7.9°C	11 h 43	17	Strong coverage
April	12.7°C	7.1°C	66 mm	11.8	9.9°C	13 h 39	36	Strong coverage
May	16.8°C	10.3°C	56 mm	8.6	13.1°C	15 h 19	60	Strong coverage
June	19.5°C	13.1°C	52 mm	7.8	15.6°C	16 h 15	75	Strong coverage
July	22.1°C	15.3°C	27 mm	4.3	17.5°C	15 h 53	92	Strong coverage
August	21.8°C	15.5°C	37 mm	5	17.6°C	14 h 25	90	Strong coverage
September	18.5°C	12.7°C	55 mm	7.5	15.2°C	12 h 32	71	Strong coverage
October	13.2°C	8.9°C	108 mm	13.4	11.7°C	10 h 40	34	Strong coverage
November	9.4°C	5.8°C	146 mm	16.8	9.2°C	9 h 01	7	Strong coverage
December	7.2°C	3.8°C	137 mm	16.9	7.5°C	8 h 10	5	Strong coverage

What has changed

Halfmoon Bay runs +1.1°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

+1.3

Feb

-0.1

Mar

+0.6

Apr

+1.0

May

+2.0

Jun

+1.4

Jul

+2.0

Aug

+1.8

Sep

+1.3

Oct

+0.8

Nov

+0.7

Dec

+0.6

July daytime highs, 2012–2023. Last recorded: 23.0°C.

Records at MERRY ISLAND LIGHTSTATION, 1960–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.0°C29 Jan 2024	-7.5°C12 Jan 2024	78 mm18 Jan 1968	251 mm2020 · driest 20 mm in 1963	62
February	14.3°C27 Feb 1986	-10.0°C2 Feb 1989	49 mm11 Feb 1983	203 mm1983 · driest 7 mm in 1993	64
March	17.5°C29 Mar 2004	-3.6°C8 Mar 2002	52 mm17 Mar 1997	172 mm1997 · driest 14 mm in 2019	63
April	23.0°C20 Apr 2016	-1.1°C3 Apr 1975	32 mm27 Apr 1962	130 mm2003 · driest 14 mm in 1973	63
May	29.5°C14 May 2023	2.5°C6 May 2002	37 mm27 May 2004	118 mm2017 · driest 1 mm in 2015	62
June	33.5°C28 Jun 2021	5.6°C1 Jun 1966	42 mm10 Jun 1972	123 mm1994 · driest 7 mm in 1987	63
July	32.0°C29 Jul 2009	9.0°C1 Jul 1979	37 mm19 Jul 1968	83 mm1974 · driest 0 mm in 1985	62
August	32.2°C4 Aug 1961	8.0°C18 Aug 2023	42 mm4 Aug 1962	106 mm1962 · driest 0 mm in 1974	62
September	28.0°C3 Sep 2017	3.9°C27 Sep 1972	69 mm1 Sep 1983	159 mm1969 · driest 0 mm in 1993	64
October	21.1°C1 Oct 1975	-0.4°C31 Oct 1984	63 mm16 Oct 2003	244 mm2003 · driest 22 mm in 1987	64
November	16.5°C8 Nov 2016	-8.0°C23 Nov 2010	61 mm14 Nov 2021	348 mm2006 · driest 52 mm in 1976	64
December	14.0°C8 Dec 2015	-11.7°C28 Dec 1968	66 mm25 Dec 1972	283 mm1979 · driest 35 mm in 1985	63

Typical days per month at MERRY ISLAND LIGHTSTATION, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	3	5	1
February	0	2	3	<1
March	0	<1	3	<1
April	0	0	2	0
May	<1	0	2	0
June	2	0	2	0
July	4	0	<1	0
August	4	0	1	0
September	<1	0	2	0
October	0	0	4	0
November	0	<1	6	<1
December	0	2	5	1

The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 89); on 2011–2025 it is July (95). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in MERRY ISLAND LIGHTSTATION’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%	52%	15%	72%	5.1–8.2°C
February	0%	46%	11%	64%	6.4–8.9°C
March	0%	44%	7%	60%	8.1–10.5°C
April	<1%	38%	5%	49%	10.9–13.3°C
May	12%	29%	5%	35%	14.6–18.1°C
June	34%	26%	5%	32%	17.6–21.1°C
July	70%	14%	3%	14%	19.8–23.4°C
August	67%	17%	4%	18%	19.7–23.0°C
September	22%	26%	6%	32%	16.6–19.6°C
October	<1%	43%	12%	61%	12.2–14.0°C
November	0%	54%	17%	76%	8.0–10.1°C
December	0%	55%	17%	76%	5.0–8.2°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.

1961Each stripe is one year’s mean temperature against the 56-year average. Warmest: 2015. Coolest: 1972.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5969185
NOAA station: CA001045100 · MERRY ISLAND LIGHTSTATION
Station distance: 5.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 49.51°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 16 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 MERRY ISLAND LIGHTSTATION is what differs

Welcome Beach→Buccaneer Bay→Redroofs→Vaucroft Beach→

Or put two places side by side: Halfmoon Bay vs Welcome Beach

Best time to visitHalfmoon Bay.

July

July

June

The whole year,without the guesswork.

Halfmoon Bay runs +1.1°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Halfmoon Bay.

The whole year,
without the guesswork.

Halfmoon Bay runs +1.1°C
on the 1961–1990 baseline.

Nearby, measured,
and named.