Summer afternoons in Mount Olive-Silverstone-Jamestown are warmer than in 95% of Canadian towns
The coldest hours of a January night bottom out at −8.9°C on average. By frosts alone, it ranks gentler than 82% of Canadian towns. From frozen January to warm July, readings climb 36°C. About 106 days a year bring 1 mm of precipitation or more.
Read at Toronto Pearson (Airport), 8.4 km south-west: ECCC’s normals for 1991–2020.
A year in Mount Olive-Silverstone-Jamestown at a glance
Each month’s typical high and low, in °C.
What stands out about Mount Olive-Silverstone-Jamestown’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Mount Olive-Silverstone-Jamestown feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 131 frosts and 125 warm days a year
Frost comes from October to April; in January almost every night freezes. Heat of 30°C or more comes on about 17 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
807 mm of precipitation in a typical year
June brings the most rain and snow; February, the least.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 115 cm of snow a year
Expect snow from November to April, with about 32 cm in January, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Mount Olive-Silverstone-Jamestown
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year. A house here needs less heating than 83% of Canadian towns.
Living with Mount Olive-Silverstone-Jamestown’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Frost usually lets go around 27 April and returns near 20 October, about 174 days apart.
Plan time outside for May, Jun, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →Roughly 21 days a year feel colder than −20 in the wind.
On some 56 days a year the humidex climbs past 30.
Bad-weather days, from blizzards to floods, get their own page for Mount Olive-Silverstone-Jamestown: the hazards page.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
Toronto Pearson (Airport) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 8.4 km south-west |
| Station altitude | 173 m |
| Completeness | at least 25 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −31.0°C |
| Hottest reading, 1991–2020 | 37.9°C |
| Average wind | 15.7 km/h on average, most often from the west |
| Next-nearest location | Toronto (City), 18 km |
How Mount Olive-Silverstone-Jamestown 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 Mount Olive-Silverstone-Jamestown whose figures come from another normals location. The nearest places to Mount Olive-Silverstone-Jamestown with figures are 11–26 km away.
Mount Olive-Silverstone-Jamestown 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 | −1.2°C | −8.9°C | −5.0°C | 62 mm | 32 cm |
| February | −0.3°C | −8.5°C | −4.4°C | 50 mm | 28 cm |
| March | 5.0°C | −3.8°C | 0.6°C | 51 mm | 17 cm |
| April | 12.0°C | 1.9°C | 7.0°C | 77 mm | 5 cm |
| May | 19.2°C | 8.2°C | 13.7°C | 78 mm | under 1 cm |
| June | 24.5°C | 13.9°C | 19.2°C | 81 mm | 0 cm |
| July | 27.4°C | 16.6°C | 22.1°C | 74 mm | 0 cm |
| August | 26.3°C | 15.8°C | 21.1°C | 69 mm | 0 cm |
| September | 22.3°C | 11.6°C | 16.9°C | 69 mm | 0 cm |
| October | 14.6°C | 5.3°C | 10.0°C | 67 mm | under 1 cm |
| November | 7.9°C | 0.2°C | 4.1°C | 72 mm | 9 cm |
| December | 1.9°C | −5.0°C | −1.6°C | 59 mm | 24 cm |
| Year | 13.3°C | 3.9°C | 8.6°C | 807 mm | 115 cm |
The month with the widest range: March, −24.7°C to 26.0°C
January is the least predictable month: about two years in three its average lands within 3.0°C of the normal, −5.0°C. June is the steadiest, within 1.3°C.
Where Mount Olive-Silverstone-Jamestown’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Toronto Pearson (Airport) (the closest location with all twelve months of temperatures).
- Comparisons: a pool of Canadian towns and neighbourhoods of 2,500 or more, read alike; whole cities and reserves stay out of it.
- Not on this page: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Mount Olive-Silverstone-Jamestown’s climate
How warm does Mount Olive-Silverstone-Jamestown get in summer?
Of all twelve months, July has the warmest afternoons, about 27.4°C.
How cold does Mount Olive-Silverstone-Jamestown get in winter?
Expect nights around −8.9°C in January; no month is colder.
How much rain and snow does Mount Olive-Silverstone-Jamestown get?
807 mm a year counting snow as water. The wettest month is June (81 mm); the driest, February (50 mm).
How long does snow stay on the ground?
Expect snow on the ground, at least 1 cm, for about 69 days a year.
Are these figures for Mount Olive-Silverstone-Jamestown itself?
Almost: ECCC’s Toronto Pearson (Airport) location, which gives these figures, lies a short way outside Mount Olive-Silverstone-Jamestown.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Mount Olive-Silverstone-Jamestown →
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).