Canada · 1991–2020

Best time to visit
Halton Hills.

June leads for comfortable weather in Halton Hills: typically 25°C by day, 10.9°C at night, with 76 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high25°C

Typical low10.9°C

Rain in June76 mm

Comfort

June

June · August · July

78climate match

Beach

July

July · August · June

62climate match

Outdoors

May

May · September · June

78climate match

The weakest month is January, scoring 5 against June’s 78 — days reach only -1°C, 25° 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

5-1° / -9.8°

Feb

50.4° / -9.7°

Mar

55.4° / -6.1°

Apr

2112.3° / -0.2°

May

5819.9° / 5.6°

Jun

7825° / 10.9°

Jul

7727.2° / 13.1°

Aug

7826.4° / 12.6°

Sep

7422.6° / 8.5°

Oct

3814.9° / 3°

Nov

57.8° / -1.7°

Dec

51.8° / -6.4°

Monthly climate evidence for Halton Hills — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 39 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-1°C	-9.8°C	69 mm	10.9	3.5°C	9 h 16	5	Strong coverage
February	0.4°C	-9.7°C	50 mm	8	2.8°C	10 h 25	5	Strong coverage
March	5.4°C	-6.1°C	53 mm	8	2.8°C	11 h 47	5	Strong coverage
April	12.3°C	-0.2°C	84 mm	9.2	3.9°C	13 h 21	21	Strong coverage
May	19.9°C	5.6°C	77 mm	9.2	7.6°C	14 h 41	58	Strong coverage
June	25°C	10.9°C	76 mm	9.5	15.0°C	15 h 25	78	Strong coverage
July	27.2°C	13.1°C	66 mm	8.4	19.8°C	15 h 08	77	Strong coverage
August	26.4°C	12.6°C	69 mm	7.8	21.1°C	13 h 59	78	Strong coverage
September	22.6°C	8.5°C	72 mm	8.2	19.0°C	12 h 27	74	Strong coverage
October	14.9°C	3°C	69 mm	9.9	13.0°C	10 h 56	38	Strong coverage
November	7.8°C	-1.7°C	76 mm	10.1	7.5°C	9 h 36	5	Strong coverage
December	1.8°C	-6.4°C	53 mm	9.1	4.9°C	8 h 57	5	Good coverage

Records at GEORGETOWN WWTP, 1978–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.0°C13 Jan 2005	-33.0°C16 Jan 1994	67 mm11 Jan 2020	161 mm1995 · driest 4 mm in 2010	44
February	17.0°C28 Feb 2018	-31.5°C10 Feb 1994	40 mm12 Feb 1985	133 mm1985 · driest 6 mm in 2002	43
March	27.0°C21 Mar 2012	-28.0°C8 Mar 1984	39 mm27 Mar 1991	125 mm1991 · driest 0 mm in 2004	45
April	31.5°C25 Apr 1990	-14.5°C5 Apr 2016	54 mm20 Apr 2000	150 mm1992 · driest 2 mm in 2003	45
May	34.5°C29 May 2006	-6.0°C1 May 2016	40 mm2 May 1992	138 mm2017 · driest 10 mm in 2016	44
June	36.0°C25 Jun 1988	-0.5°C12 Jun 1980	86 mm28 Jun 1982	199 mm1982 · driest 17 mm in 1991	44
July	37.0°C7 Jul 1988	3.0°C1 Jul 1986	56 mm4 Jul 1981	215 mm2023 · driest 15 mm in 2014	40
August	36.5°C8 Aug 2001	0.0°C29 Aug 1982	88 mm28 Aug 2021	161 mm1985 · driest 0 mm in 2010	43
September	35.5°C9 Sep 2002	-4.0°C30 Sep 1993	70 mm10 Sep 1986	262 mm1986 · driest 19 mm in 2007	43
October	31.0°C3 Oct 2023	-8.5°C26 Oct 1987	54 mm5 Oct 1995	139 mm2019 · driest 17 mm in 2000	42
November	24.0°C5 Nov 2015	-16.5°C13 Nov 2019	55 mm2 Nov 1999	173 mm1985 · driest 10 mm in 2012	44
December	20.5°C3 Dec 1982	-29.5°C25 Dec 1980	41 mm24 Dec 1979	122 mm1990 · driest 2 mm in 2010	40

Typical days per month at GEORGETOWN WWTP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	2	7
February	0	0	23	2	5
March	<1	0	23	2	3
April	<1	0	15	3	1
May	6	1	4	2	0
June	14	4	0	2	0
July	21	7	0	2	0
August	20	4	0	2	0
September	9	2	<1	2	0
October	2	0	9	2	<1
November	0	0	18	2	2
December	0	0	25	2	5

How often, not how much — every day in GEORGETOWN WWTP’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%	32%	6%	41%	-4.9–1.9°C
February	0%	28%	6%	32%	-2.8–3.1°C
March	2%	28%	6%	40%	3.0–7.9°C
April	9%	32%	9%	41%	10.2–14.3°C
May	36%	28%	8%	34%	16.8–22.7°C
June	60%	30%	8%	34%	22.6–26.7°C
July	72%	26%	8%	30%	25.3–29.5°C
August	70%	26%	9%	29%	24.1–28.2°C
September	49%	28%	9%	34%	19.8–24.9°C
October	13%	31%	8%	40%	12.4–16.7°C
November	2%	33%	8%	45%	5.1–10.3°C
December	0%	33%	7%	45%	-1.8–4.8°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.

1981Each stripe is one year’s mean temperature against the 31-year average. Warmest: 2023. Coolest: 1985.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5969721
NOAA station: CA006152695 · GEORGETOWN WWTP
Station distance: 4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 43.64°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 39 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 GEORGETOWN WWTP is what differs

Milton→Georgetown→Acton→Agerton→Alloa→Ashgrove→

Or put two places side by side: Halton Hills vs Milton

Best time to visitHalton Hills.

June

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Halton Hills.

The whole year,
without the guesswork.

Nearby, measured,
and named.