Afternoon heat in Rivers Edge / Castlemore Crossing beats that of 95% of Canadian towns
On a normal January night the air cools to about −8.9°C. The wettest month is June; the driest is February. Frosty nights are scarcer than in 82% of Canadian towns. For walks and days out, May, June, August and September bring highs of 19–26°C.
Borrowed figures: Rivers Edge / Castlemore Crossing has no normals station, so these come from Toronto Pearson (Airport), 12 km south.
A year in Rivers Edge / Castlemore Crossing at a glance
Each month’s typical high and low, in °C.
What stands out about Rivers Edge / Castlemore Crossing’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Rivers Edge / Castlemore Crossing feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 131 days, 20°C on 125
The frost season runs October to April, and January freezes nearly every night. 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
Rain and melted snow: about 807 mm a year
Some 106 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 115 cm of snow a year
From November to April snow is likely; January is the peak, at about 32 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Rivers Edge / Castlemore Crossing
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
ECCC sums, over the year, how many degrees each day’s average falls short of 18°C. Over a year, a home here needs less heating than 83% of Canadian towns.
Living with Rivers Edge / Castlemore Crossing’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.
Afternoons of 17–27°C and nights of at least 8°C arrive in May, Jun, Aug and Sep.
Parks & trails →Winter brings about 21 days with a wind chill below −20.
Humid heat, a humidex over 30, comes on about 56 days a year.
Extremes don’t show in averages: floods, wildfire smoke and ice storms are on Rivers Edge / Castlemore Crossing’s hazards page.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
Behind the 1991–2020 normals for Toronto Pearson (Airport) are 2 stations, which ECCC combines into one record.
| Distance from the town | 12 km south |
| 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), 26 km |
How Rivers Edge / Castlemore Crossing 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
Nearby places read from a different ECCC location (places on Rivers Edge / Castlemore Crossing’s own would show the same figures). Distances here run 14–25 km: that is how far the nearest places with figures are from Rivers Edge / Castlemore Crossing.
Rivers Edge / Castlemore Crossing 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 | −1.2°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 |
Two years in three, January’s average lands within 3.0°C of normal, against the steadier June
The thirty-year records stretch furthest in March: a low of −24.7°C in 2003 and a high of 26.0°C in 2012.
Where Rivers Edge / Castlemore Crossing’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Toronto Pearson (Airport), its nearest location with complete temperatures.
- 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: 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 Rivers Edge / Castlemore Crossing’s climate
How warm does Rivers Edge / Castlemore Crossing get in summer?
Expect highs near 27.4°C in July, the hottest month on average.
How cold does Rivers Edge / Castlemore Crossing get in winter?
The coldest nights come in January, averaging −8.9°C.
How much rain and snow does Rivers Edge / Castlemore Crossing get?
About 807 mm a year, rain and melted snow together. June is the wettest month (81 mm) and February the driest (50 mm).
How long does snow stay on the ground?
About 69 days a year have 1 cm of snow or more on the ground.
Are these figures for Rivers Edge / Castlemore Crossing itself?
Not exactly. Rivers Edge / Castlemore Crossing lacks a normals station, so Toronto Pearson (Airport) supplies the figures.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Rivers Edge / Castlemore Crossing →
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).