Summer arrives in force in Stone Mills, hotter than in 89% of Canadian towns
January nights here settle around −12.4°C. Some 40°C separates winter nights from summer afternoons. It is a wet place: more rain and snow fall here than on 67% of Canadian towns. Heating does most of its work from October to April, in months below 10°C on average.
Environment and Climate Change Canada’s 1991–2020 normals, measured at Centreville, 2.9 km south-west.
A year in Stone Mills at a glance
Each month’s typical high and low, in °C.
What stands out about Stone Mills’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Stone Mills feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 154 days, 20°C on 124
The frost season runs October to May, and January freezes nearly every night. On about 13 nights a year the air falls below −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 984 mm of rain and snow a year
September is the wettest month and February the driest. On about 128 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
158 cm of snow in a typical year
The snow season runs October to April; January brings the most, about 45 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Stone Mills
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Every day colder than 18°C on average adds its gap in degrees to the year’s heating total. By this count, homes here need less heating than 67% of Canadian towns.
Living with Stone Mills’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Aug and Sep.
Parks & trails →Averages smooth over blizzards, ice storms, floods and heat waves; Stone Mills’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Centreville
The page’s figures are ECCC’s 1991–2020 normals for Centreville, one of its 450 normals locations.
| Distance from the town | 2.9 km south-west |
| Station altitude | 150 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −37.0°C |
| Hottest reading, 1991–2020 | 37.5°C |
| Next-nearest location | Kingston, 31 km |
How Stone Mills 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 Stone Mills whose figures come from another normals location. Distances here run 25–45 km: that is how far the nearest places with figures are from Stone Mills.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Stone Mills Centreville | 27.2°C | −12.4°C | 984 mm |
| South Frontenac 25 km · Kingston | 25.4°C 1.8°C cooler | −11.5°C 0.9°C milder | 984 mm |
| Tyendinaga Mohawk Territory 34 km · Trenton | 26.5°C 0.7°C cooler | −11.2°C 1.2°C milder | 941 mm |
Stone Mills weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −2.9°C | −12.4°C | −7.7°C | 86 mm | 45 cm |
| February | −1.4°C | −11.6°C | −6.5°C | 61 mm | 34 cm |
| March | 4.1°C | −6.3°C | −1.4°C | 65 mm | 24 cm |
| April | 11.9°C | 0.8°C | 6.3°C | 88 mm | 7 cm |
| May | 19.6°C | 7.2°C | 13.4°C | 84 mm | under 1 cm |
| June | 24.4°C | 12.2°C | 18.4°C | 90 mm | 0 cm |
| July | 27.2°C | 14.9°C | 21.1°C | 68 mm | 0 cm |
| August | 26.2°C | 13.9°C | 20.1°C | 75 mm | 0 cm |
| September | 21.9°C | 9.9°C | 15.9°C | 100 mm | 0 cm |
| October | 14.1°C | 3.9°C | 9.0°C | 96 mm | 1 cm |
| November | 6.9°C | −1.7°C | 2.6°C | 88 mm | 12 cm |
| December | 0.4°C | −7.5°C | −3.6°C | 83 mm | 35 cm |
| Year | 12.7°C | 1.9°C | 7.3°C | 984 mm | 158 cm |
March has run from −28.0°C to 27.5°C in thirty years
The month to count on least is January: one year in three its average strays more than 3.1°C from −7.7°C. June moves least, typically by 1.1°C.
Where Stone Mills’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Centreville, 1991–2020, chosen as the nearest location with a full temperature record.
- Comparisons: every place of 2,500+ in Canada but the city hubs and the reserves, each on its nearest ECCC location.
- Not on this page: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Stone Mills’s climate
How warm does Stone Mills get in summer?
July is the warmest month, with average highs of 27.2°C.
How cold does Stone Mills get in winter?
Overnight lows average −12.4°C in January, the coldest month.
How much rain and snow does Stone Mills get?
Around 984 mm a year in all, from 100 mm in September down to 61 mm in February.
Are these figures for Stone Mills itself?
Yes. Centreville, where ECCC’s 1991–2020 normals were measured, lies within Stone Mills.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Stone Mills →
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).