Less snow falls on Rolston than on 81% of Canadian towns: about 115 cm a year
January mornings start at about −9.1°C. A year here swings 36°C from midwinter lows to midsummer highs. By frosts alone, it ranks gentler than 73% of Canadian towns. Comfortable outdoor weather lasts from June to September, with highs of 22–27°C.
Figures: ECCC’s 1991–2020 normals for Hamilton (7.1 km south-west).
A year in Rolston at a glance
Each month’s typical high and low, in °C.
What stands out about Rolston’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Rolston feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 139 frosts and 123 warm days a year
From October to May frost is routine, and in January it comes on almost every night. Heat of 30°C or more comes on about 13 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 902 mm of rain and snow a year
The most falls in July, the least in February. About 114 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 115 cm in a normal year
The snow season runs November to April; January brings the most, about 32 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Snowfall: Toronto Pearson (Airport), 55 km away (Hamilton records no complete year of it).
Heating a home in Rolston
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
ECCC sums, over the year, how many degrees each day’s average falls short of 18°C. Homes here need less heating than 77% of Canadian towns.
Living with Rolston’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Tender plants are usually safe from around 1 May until frost returns near 12 October: about 164 days.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.
Parks & trails →Winter brings about 20 days with a wind chill below −20.
About 59 days a year feel above 30 on the humidex.
The normals describe a typical year, not its worst days; the hazards page covers Rolston’s.
Flood & hazards →ECCC’s normals location: Hamilton
ECCC builds the Hamilton normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 7.1 km south-west |
| Station altitude | 238 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Snowfall from | Toronto Pearson (Airport), 55 km |
| Coldest reading, 1991–2020 | −30.0°C |
| Hottest reading, 1991–2020 | 36.4°C |
| Average wind | 16.0 km/h on average, most often from the south-west |
| Next-nearest location | Burlington Piers, 11 km |
How Rolston 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
The nearest places on a normals location of their own: those that share Rolston’s would only repeat its figures. Rolston has few close neighbours with figures, so the list reaches 3–30 km out.
Rolston weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −1.4°C | −9.1°C | −5.3°C | 73 mm | 32 cm |
| February | −0.9°C | −9.2°C | −5.0°C | 53 mm | 28 cm |
| March | 4.7°C | −4.4°C | 0.2°C | 69 mm | 17 cm |
| April | 11.8°C | 1.3°C | 6.5°C | 81 mm | 5 cm |
| May | 18.9°C | 7.3°C | 13.1°C | 81 mm | under 1 cm |
| June | 24.2°C | 12.8°C | 18.5°C | 78 mm | 0 cm |
| July | 26.6°C | 15.2°C | 20.9°C | 98 mm | 0 cm |
| August | 25.6°C | 14.5°C | 20.1°C | 67 mm | 0 cm |
| September | 21.7°C | 10.5°C | 16.1°C | 74 mm | 0 cm |
| October | 14.5°C | 4.8°C | 9.7°C | 84 mm | under 1 cm |
| November | 7.7°C | −0.2°C | 3.8°C | 78 mm | 9 cm |
| December | 1.5°C | −5.4°C | −1.9°C | 67 mm | 24 cm |
| Year | 12.9°C | 3.2°C | 8.1°C | 902 mm | 115 cm |
March: −24.6°C at its coldest, 26.8°C at its warmest
From one year to the next, January’s average typically shifts by 3.0°C around its normal of −5.3°C, the widest of any month, while June’s shifts by 1.1°C.
Where Rolston’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Hamilton, its nearest location with complete temperatures.
- Other locations: ECCC blanks a month that fails its completeness rule, so the precipitation or snowfall here comes from the next location with all twelve months.
- Comparisons: the 2,500-plus towns and neighbourhoods of Canada, each read from its closest normals location; whole cities and reserves aren’t counted.
- 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 Rolston’s climate
How warm does Rolston get in summer?
Expect highs near 26.6°C in July, the hottest month on average.
How cold does Rolston get in winter?
Midwinter means February, when a typical night reaches −9.2°C.
How much rain and snow does Rolston get?
The yearly total is about 902 mm. July gets 98 mm, the most of any month; February gets 53 mm, the least.
How long does snow stay on the ground?
Around 82 days a year see 1 cm of snow or more lying.
Are these figures for Rolston itself?
Nearly: Hamilton, the location behind them, sits just beyond Rolston’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Rolston →
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).