Frost comes to Aylmer less often than to 75% of Canadian towns
July afternoons average 26.6°C. Summer afternoons here are warmer than in 70% of Canadian towns. From frozen January to warm July, readings climb 36°C. An umbrella or a shovel earns its place on about 128 days a year with 1 mm or more.
No ECCC station in Aylmer has 1991–2020 normals; the page reads London, 32 km north-west, instead.
A year in Aylmer at a glance
Each month’s typical high and low, in °C.
What stands out about Aylmer’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Aylmer feels like
Each season’s and each month’s usual high and low, 1991–2020.
139 frost days and 128 days above 20°C a year
Frost comes from October to May; in January almost every night freezes. About 11 days a year top 30°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
962 mm of precipitation in a typical year
September brings the most rain and snow; February, the least.
Rain and snow by month
Millimetres
152 cm of snow in a typical year
Snow falls from October to April, most of all in January (about 43 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Snowfall: Strathroy-Mullifarry, 58 km away (London records no complete year of it).
Heating a home in Aylmer
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year. Over a year, a home here needs less heating than 79% of Canadian towns.
Living with Aylmer’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Gardens get from about 3 May to 16 October without frost, around 165 days in all.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.
Parks & trails →Count on some 18 days a year when the wind makes it feel below −20.
Count on some 55 humid days a year with the humidex past 30.
Bad-weather days, from blizzards to floods, get their own page for Aylmer: the hazards page.
Flood & hazards →ECCC’s normals location: London
London is a composite: ECCC joins 3 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 32 km north-west |
| Station altitude | 278 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Strathroy-Mullifarry, 58 km |
| Coldest reading, 1991–2020 | −29.1°C |
| Hottest reading, 1991–2020 | 37.0°C |
| Average wind | 14.0 km/h on average, most often from the west |
| Next-nearest location | Delhi, 37 km |
How Aylmer compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used in Ontario.
Nearby towns’ climate
Places around Aylmer whose figures come from another normals location. Aylmer has no close neighbour with figures; the nearest is 14 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Aylmer London | 26.6°C | −9.1°C | 962 mm |
| Bayham 14 km · Delhi | 27.5°C 0.9°C warmer | −8.9°C about the same | 965 mm |
Aylmer weather by month
Average daily high and low, mean temperature, rain and snow (as water) and snowfall by month, 1991–2020.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −1.6°C | −9.1°C | −5.4°C | 79 mm | 43 cm |
| February | −0.6°C | −9.0°C | −4.8°C | 63 mm | 32 cm |
| March | 4.6°C | −4.5°C | 0.1°C | 67 mm | 20 cm |
| April | 12.2°C | 1.4°C | 6.8°C | 89 mm | 5 cm |
| May | 19.3°C | 7.7°C | 13.5°C | 89 mm | under 1 cm |
| June | 24.4°C | 13.2°C | 18.8°C | 86 mm | 0 cm |
| July | 26.6°C | 15.3°C | 21.0°C | 81 mm | 0 cm |
| August | 25.7°C | 14.4°C | 20.1°C | 67 mm | 0 cm |
| September | 22.1°C | 10.5°C | 16.3°C | 93 mm | 0 cm |
| October | 14.7°C | 5.0°C | 9.9°C | 83 mm | 2 cm |
| November | 7.5°C | −0.3°C | 3.6°C | 88 mm | 13 cm |
| December | 1.4°C | −5.2°C | −2.0°C | 79 mm | 37 cm |
| Year | 13.0°C | 3.3°C | 8.2°C | 962 mm | 152 cm |
March: −25.6°C at its coldest, 27.2°C at its warmest
Year to year, February varies most (a standard deviation of 3.0°C around −4.8°C) and June least (1.1°C).
Where Aylmer’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for London, the nearest location with a full year of temperatures.
- Other locations: precipitation and snowfall come from the nearest location that publishes all twelve months of them, as named above.
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- Not on this page: sunshine, not in ECCC’s 1991–2020 normals, and the effect of the town’s height, for which there is no figure.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Aylmer’s climate
How warm does Aylmer get in summer?
The warmest month is July, when afternoons average 26.6°C.
How cold does Aylmer get in winter?
At its coldest, in January, the normal low is −9.1°C.
How much rain and snow does Aylmer get?
The year adds up to 962 mm. September is the peak month (93 mm) and February the low one (63 mm).
Are these figures for Aylmer itself?
No. ECCC measures normals at London, not in Aylmer; the page uses the nearest it has.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Aylmer →
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).