Canada · 1991–2020

Best time to visit
Aylmer.

June leads for comfortable weather in Aylmer: typically 24.4°C by day, 13.6°C at night, with 95 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high24.4°C

Typical low13.6°C

Rain in June95 mm

Comfort

June

June · August · July

81climate match

Beach

July

July · August · June

62climate match

Outdoors

May

May · September · June

79climate match

The weakest month is January, scoring 5 against June’s 81 — days reach only -5.2°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

5-5.2° / -13.7°

Feb

5-3.4° / -12.7°

Mar

52.6° / -6.6°

Apr

2111.3° / 1.3°

May

6019.6° / 8.3°

Jun

8124.4° / 13.6°

Jul

7526.8° / 16°

Aug

8125.7° / 14.8°

Sep

7021.3° / 10.5°

Oct

3213.4° / 4.5°

Nov

55.9° / -1.5°

Dec

5-1.6° / -8.5°

Monthly climate evidence for Aylmer — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-5.2°C	-13.7°C	65 mm	11	9 h 05	5	Strong coverage
February	-3.4°C	-12.7°C	52 mm	8.9	10 h 18	5	Strong coverage
March	2.6°C	-6.6°C	62 mm	9.1	11 h 46	5	Strong coverage
April	11.3°C	1.3°C	80 mm	10.2	13 h 26	21	Strong coverage
May	19.6°C	8.3°C	80 mm	10.4	14 h 52	60	Strong coverage
June	24.4°C	13.6°C	95 mm	10.6	15 h 39	81	Strong coverage
July	26.8°C	16°C	92 mm	9.7	15 h 20	75	Strong coverage
August	25.7°C	14.8°C	87 mm	8.9	14 h 06	81	Strong coverage
September	21.3°C	10.5°C	87 mm	9.3	12 h 28	70	Strong coverage
October	13.4°C	4.5°C	89 mm	10.7	10 h 52	32	Strong coverage
November	5.9°C	-1.5°C	70 mm	9.8	9 h 26	5	Strong coverage
December	-1.6°C	-8.5°C	72 mm	11.4	8 h 44	5	Strong coverage

What has changed

Aylmer runs +1.6°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

+2.2

Feb

+1.7

Mar

+1.3

Apr

+0.4

May

+1.8

Jun

+0.9

Jul

+1.3

Aug

+1.3

Sep

+2.5

Oct

+1.7

Nov

+1.2

Dec

+3.0

June daytime highs, 2011–2023. Last recorded: 25.1°C.

Records at OTTAWA CDA, 1889–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	12.0°C30 Jan 2013	-37.8°C19 Jan 1925	56 mm29 Jan 1894	139 mm1924 · driest 12 mm in 1961	135
February	16.0°C28 Feb 2024	-38.3°C17 Feb 1934	46 mm8 Feb 1895	157 mm1960 · driest 3 mm in 1978	134
March	26.7°C21 Mar 2012	-36.7°C4 Mar 1938	49 mm12 Mar 1962	144 mm1899 · driest 9 mm in 1957	135
April	31.2°C27 Apr 1990	-20.6°C1 Apr 1923	48 mm15 Apr 1956	167 mm2019 · driest 13 mm in 2001	133
May	35.2°C26 May 2010	-7.2°C10 May 1902	76 mm17 May 1916	186 mm1986 · driest 6 mm in 1903	132
June	36.7°C22 Jun 1921	0.0°C4 Jun 1910	78 mm17 Jun 1946	190 mm2002 · driest 21 mm in 1991	134
July	37.8°C13 Jul 1921	3.3°C10 Jul 1942	85 mm24 Jul 2018	250 mm1899 · driest 17 mm in 2012	134
August	37.8°C1 Aug 1917	1.7°C30 Aug 1934	90 mm23 Aug 1943	230 mm1943 · driest 10 mm in 1899	134
September	36.7°C11 Sep 1931	-4.4°C28 Sep 1947	109 mm9 Sep 2004	168 mm1986 · driest 12 mm in 1897	134
October	31.0°C3 Oct 2023	-12.8°C26 Oct 1933	70 mm29 Oct 2017	188 mm1995 · driest 6 mm in 1924	134
November	24.0°C5 Nov 2022	-23.9°C30 Nov 1925	53 mm25 Nov 1912	197 mm1927 · driest 19 mm in 1939	135
December	17.2°C4 Dec 2012	-38.9°C29 Dec 1933	73 mm31 Dec 1933	167 mm1933 · driest 15 mm in 1963	135

Typical days per month at OTTAWA CDA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	2	13
February	0	0	26	1	10
March	<1	0	25	2	7
April	<1	<1	12	3	2
May	6	<1	<1	3	<1
June	14	3	0	3	0
July	22	6	0	3	0
August	18	4	0	3	0
September	7	1	<1	3	0
October	<1	0	6	3	<1
November	0	0	19	2	5
December	0	0	28	2	11

The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 89); on 2011–2025 it is June (87). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in OTTAWA CDA’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%	35%	6%	45%	-9.7–-2.2°C
February	0%	33%	6%	42%	-7.7–-1.4°C
March	<1%	30%	7%	39%	-1.4–5.2°C
April	7%	31%	7%	38%	7.8–13.5°C
May	33%	32%	8%	42%	16.4–21.8°C
June	58%	33%	10%	42%	22.2–25.9°C
July	67%	31%	10%	38%	24.8–28.4°C
August	66%	29%	9%	34%	23.4–27.4°C
September	40%	31%	9%	39%	18.2–23.0°C
October	10%	32%	8%	40%	11.0–15.5°C
November	<1%	34%	8%	46%	2.4–7.4°C
December	0%	36%	7%	51%	-6.8–0.3°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.

1890Each stripe is one year’s mean temperature against the 130-year average. Warmest: 1998. Coolest: 1904.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 6354934
NOAA station: CA006105976 · OTTAWA CDA
Station distance: 7.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 45.40°, 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 OTTAWA CDA is what differs

Ottawa→Ottawa South→Kanata→Hull→Centretown→Alta Vista→

Or put two places side by side: Aylmer vs Ottawa

Best time to visitAylmer.

June

July

May

The whole year,without the guesswork.

Aylmer runs +1.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Aylmer.

The whole year,
without the guesswork.

Aylmer runs +1.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.