Photo: The Silverliner · CC BY-SA 3.0No extremes in Dundalk: its weather tracks the middle of Canadian towns
About 1,035 mm of rain and snow falls in a typical year; July afternoons reach 25.1°C and January nights drop to −10.9°C. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 36°C apart. It is a wet place: more rain and snow fall here than on 70% of Canadian towns. Expect about 158 frosty starts a year, days when the air falls to freezing.
Borrowed figures: Dundalk has no normals station, so these come from Mount Forest, 29 km south-west.
A year in Dundalk at a glance
Each month’s typical high and low, in °C.
What stands out about Dundalk’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Dundalk feels like
Each season’s and each month’s usual high and low, 1991–2020.
158 frost days and 111 days above 20°C a year
From October to May frost is routine, and in January it comes on almost every night. Deep cold, under −20°C, comes on about 8 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 1,035 mm of rain and snow a year
June brings the most rain and snow; March, the least. About 140 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Snowfall: about 174 cm in a normal year
From October to April snow is likely; December is the peak, at about 42 cm.
Snowfall by month
Centimetres
Mount Forest publishes no full year of snowfall, so these figures come from Egbert, 58 km away.
Heating a home in Dundalk
90% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
The count adds up, day by day, how far the mean temperature falls short of 18°C.
Living with Dundalk’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
For long days outdoors, Jun, Jul, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →Wind chill falls below −20 on about 25 days a year: cover skin and dress in layers.
The humidex tops 30 on about 36 days a year: muggy days to plan around.
The normals describe a typical year, not its worst days; the hazards page covers Dundalk’s.
Flood & hazards →ECCC’s normals location: Mount Forest
Behind the 1991–2020 normals for Mount Forest are 2 stations, which ECCC combines into one record.
| Distance from the town | 29 km south-west |
| Station altitude | 404 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Egbert, 58 km |
| Coldest reading, 1991–2020 | −32.5°C |
| Hottest reading, 1991–2020 | 34.5°C |
| Average wind | 10.7 km/h on average, most often from the south |
| Next-nearest location | Collingwood, 45 km |
How Dundalk compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Ontario.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Dundalk’s own would show the same figures).
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Dundalk Mount Forest | 25.1°C | −10.9°C | 1,035 mm |
| Melancthon 17 km · Collingwood | 25.3°C about the same | −8.7°C 2.2°C milder | 793 mm |
Dundalk weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −3.3°C | −10.9°C | −7.1°C | 92 mm | 40 cm |
| February | −2.6°C | −11.1°C | −6.9°C | 73 mm | 33 cm |
| March | 2.5°C | −6.5°C | −2.0°C | 68 mm | 26 cm |
| April | 10.2°C | −0.2°C | 5.0°C | 74 mm | 9 cm |
| May | 17.7°C | 6.4°C | 12.0°C | 98 mm | under 1 cm |
| June | 22.8°C | 11.7°C | 17.3°C | 100 mm | 0 cm |
| July | 25.1°C | 13.6°C | 19.4°C | 98 mm | 0 cm |
| August | 24.2°C | 13.1°C | 18.7°C | 84 mm | 0 cm |
| September | 20.5°C | 9.6°C | 15.1°C | 85 mm | 0 cm |
| October | 13.0°C | 4.1°C | 8.5°C | 81 mm | 3 cm |
| November | 5.5°C | −1.5°C | 2.0°C | 92 mm | 22 cm |
| December | −0.5°C | −6.7°C | −3.6°C | 90 mm | 42 cm |
| Year | 11.2°C | 1.8°C | 6.5°C | 1,035 mm | 174 cm |
From year to year, February moves by 3.1°C, more than any month, and June least
March has the widest record range, −32.5°C in 2003 to 25.7°C in 2012; the tick on each bar is the month’s normal.
Where Dundalk’s numbers come from
Averages over 30 years, not a forecast.
- Normals: Environment and Climate Change Canada’s 1991–2020 normals, Mount Forest: the nearest of its locations with every month’s temperatures.
- 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: 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 Dundalk’s climate
How warm does Dundalk get in summer?
Peak warmth comes in July, at about 25.1°C by mid-afternoon.
How cold does Dundalk get in winter?
On a normal February night the air drops to −11.1°C, the coldest of the year.
How much rain and snow does Dundalk get?
Over twelve months, rain and melted snow come to 1,035 mm; the range runs from 68 mm in March to 100 mm in June.
Are these figures for Dundalk itself?
The figures are ECCC’s for Mount Forest; Dundalk has no normals station.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Dundalk →
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).