Jackson gets fewer frosts than 75% of Canadian towns
Peak summer warmth arrives in July, with afternoons near 26.6°C. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 36°C apart. Its July heat outdoes that of 70% of Canadian towns. Garden chairs stay out from June to September, the months with highs of 22–27°C.
Environment and Climate Change Canada’s 1991–2020 normals at its London station, 8.2 km north.
A year in Jackson at a glance
Each month’s typical high and low, in °C.
What stands out about Jackson’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Jackson feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
About 139 frosts and 128 warm days a year
From October to May frost is routine, and in January it comes on almost every night. 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
About 962 mm of rain and snow a year
The most falls in September, the least in February. About 128 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
About 152 cm of snow a year
From October to April snow is likely; January is the peak, at about 43 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
ECCC’s London normals leave snowfall out; the figures here come from Strathroy-Mullifarry, 39 km away.
Heating a home in Jackson
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Behind the figure: the degrees each day’s mean falls under 18°C, summed for the year. By this count, homes here need less heating than 79% of Canadian towns.
Living with Jackson’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
About 165 days a year pass without frost, from an average last frost of 3 May to a first of 16 October.
The outdoor season by the averages is Jun, Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →About 18 days a year bring a wind chill under −20, when bare skin chills fast.
On some 55 days a year the humidex climbs past 30.
For the weather that does damage, from ice storms to floods, see Jackson’s 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 | 8.2 km north |
| Station altitude | 278 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Strathroy-Mullifarry, 39 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 | Strathroy-Mullifarry, 39 km |
How Jackson compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use in Ontario.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Jackson’s own would show the same figures). Distances here run 24–38 km: that is how far the nearest places with figures are from Jackson.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Jackson London | 26.6°C | −9.1°C | 962 mm |
| Oneida 41 24 km · Strathroy-Mullifarry | 27.3°C 0.7°C warmer | −8.5°C 0.6°C milder | 966 mm |
| South-West Oxford 31 km · Delhi | 27.5°C 0.9°C warmer | −8.9°C about the same | 965 mm |
Jackson weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the snowfall.
| 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 |
February strays furthest from its normal year to year, by 3.0°C; June the least
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −25.6°C in 2003 to 27.2°C in 2012.
Where Jackson’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the closest ECCC location with twelve months of temperature normals, London, 1991–2020.
- Other locations: where a location publishes no full year of precipitation or snowfall, the nearest one that does supplies it, named beside those figures.
- Comparisons: every Canadian town and neighbourhood of 2,500 or more, each read from its own nearest location; city totals and reserves are left out.
- Not on this page: sunshine (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Jackson’s climate
How warm does Jackson get in summer?
Of all twelve months, July has the warmest afternoons, about 26.6°C.
How cold does Jackson get in winter?
At its coldest, in January, the normal low is −9.1°C.
How much rain and snow does Jackson get?
Rain and snow, with snow counted as water, total 962 mm a year; September leads with 93 mm and February trails with 63 mm.
Are these figures for Jackson itself?
They are the normals for London, measured just outside Jackson itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Jackson →
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).