Photo: Dr Wilson · CC BY-SA 3.0Perth sits near the top of Canadian towns for snow: about 311 cm a year
Midsummer highs settle at about 25.7°C. Winter and summer sit 43°C apart. Precipitation is plentiful here, more than falls on 84% of Canadian towns. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
1991–2020 normals from ECCC’s Aroostook station, 3.6 km north-west.
A year in Perth at a glance
Each month’s typical high and low, in °C.
What stands out about Perth’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in New Brunswick beside it.
What a year in Perth feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
About 181 frosts and 103 warm days a year
The frost season runs September to May, and January freezes nearly every night. Deep cold, under −20°C, comes on about 31 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
1,149 mm of precipitation in a typical year
January brings the most rain and snow; February, the least. Some 130 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 311 cm in a normal year
Expect snow from October to May, with about 76 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 Perth
90% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Measured against 18°C: each day’s shortfall in mean temperature, added over twelve months. Over a year, a home here needs more heating than 62% of Canadian towns.
Living with Perth’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jun, Jul and Aug.
Parks & trails →Storms, floods and heat waves sit outside these normals; Perth’s hazards page covers them.
Flood & hazards →ECCC’s normals location: Aroostook
Aroostook is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 3.6 km north-west |
| Station altitude | 80 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −40.5°C |
| Hottest reading, 1991–2020 | 36.0°C |
| Next-nearest location | St. Leonard, 53 km |
How Perth compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in New Brunswick.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Perth’s would only repeat its figures. No closer places have figures: these lie 28–39 km from Perth.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Perth Aroostook | 25.7°C | −17.5°C | 1,149 mm |
| Grand Falls 28 km · St. Leonard | 24.2°C 1.5°C cooler | −17.9°C about the same | 1,128 mm |
| Florenceville-Bristol 29 km · Woodstock/Newbridge | 25.3°C about the same | −15.3°C 2.2°C milder | 1,161 mm |
Perth 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 | −6.1°C | −17.5°C | −11.8°C | 108 mm | 76 cm |
| February | −3.8°C | −16.7°C | −10.3°C | 81 mm | 67 cm |
| March | 2.3°C | −9.7°C | −3.7°C | 87 mm | 57 cm |
| April | 9.5°C | −2.2°C | 3.7°C | 81 mm | 18 cm |
| May | 18.0°C | 4.2°C | 11.1°C | 89 mm | 2 cm |
| June | 22.7°C | 9.1°C | 15.9°C | 97 mm | 0 cm |
| July | 25.7°C | 12.9°C | 19.3°C | 104 mm | 0 cm |
| August | 24.7°C | 11.8°C | 18.3°C | 99 mm | 0 cm |
| September | 20.1°C | 7.6°C | 13.9°C | 101 mm | under 1 cm |
| October | 12.4°C | 1.6°C | 7.1°C | 102 mm | 4 cm |
| November | 4.6°C | −3.8°C | 0.4°C | 94 mm | 27 cm |
| December | −2.2°C | −10.9°C | −6.6°C | 106 mm | 61 cm |
| Year | 10.7°C | −1.1°C | 4.8°C | 1,149 mm | 311 cm |
The month with the widest range: March, −36.0°C to 24.5°C
February is the least predictable month: about two years in three its average lands within 3.1°C of the normal, −10.3°C. June is the steadiest, within 1.1°C.
Where Perth’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Aroostook, the nearest location with a full year of temperatures.
- Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest 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 Perth’s climate
How warm does Perth get in summer?
A normal July afternoon tops out at about 25.7°C, the year’s high point.
How cold does Perth get in winter?
In January, the coldest month, the typical low is −17.5°C.
How much rain and snow does Perth get?
A normal year brings 1,149 mm, snow included as water: January is wettest at 108 mm, February driest at 81 mm.
How long does snow stay on the ground?
Expect snow on the ground, at least 1 cm, for about 138 days a year.
Are these figures for Perth itself?
Yes, measured at Aroostook, which sits inside Perth’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Perth →
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).