Photo: Original uploader was Rangeley at en.wikipedia · CC BY-SA 3.0More rain and snow fall on Sussex than on 84% of Canadian towns: 1,152 mm a year
The coldest hours of a January night bottom out at −13.2°C on average. The seasons are far apart: from a winter night to a summer afternoon the average spans 39°C. Heating does most of its work from October to April, in months below 10°C on average.
Measured at Sussex/Four Corners, 1.9 km west: ECCC’s normals for 1991–2020.
A year in Sussex at a glance
Each month’s typical high and low, in °C.
What stands out about Sussex’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in New Brunswick beside it.
What a year in Sussex feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 166 frosts and 108 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 12 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 1,152 mm of rain and snow a year
The most falls in January, the least in August. Some 129 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 248 cm in a normal year
The snow season runs November to May; January brings the most, about 66 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Sussex
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 Sussex’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
On average the last spring frost comes around 20 May and the first autumn frost around 26 September: about 128 frost-free days between.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.
Parks & trails →For the weather that does damage, from ice storms to floods, see Sussex’s hazards page.
Flood & hazards →ECCC’s normals location: Sussex/Four Corners
Behind the 1991–2020 normals for Sussex/Four Corners are 2 stations, which ECCC combines into one record.
| Distance from the town | 1.9 km west |
| Station altitude | 21 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −34.0°C |
| Hottest reading, 1991–2020 | 35.0°C |
| Next-nearest location | Alma/Fundy Park, 46 km |
How Sussex 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 Sussex’s would only repeat its figures. Distances here run 28–40 km: that is how far the nearest places with figures are from Sussex.
Sussex weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −2.5°C | −13.2°C | −7.9°C | 116 mm | 66 cm |
| February | −0.9°C | −12.1°C | −6.5°C | 82 mm | 46 cm |
| March | 3.4°C | −6.6°C | −1.6°C | 109 mm | 51 cm |
| April | 10.2°C | −0.5°C | 4.9°C | 81 mm | 19 cm |
| May | 17.3°C | 4.8°C | 11.1°C | 90 mm | 2 cm |
| June | 22.6°C | 10.1°C | 16.4°C | 90 mm | 0 cm |
| July | 25.7°C | 13.7°C | 19.7°C | 71 mm | 0 cm |
| August | 25.3°C | 12.8°C | 19.1°C | 64 mm | 0 cm |
| September | 20.8°C | 8.6°C | 14.7°C | 110 mm | 0 cm |
| October | 13.8°C | 3.1°C | 8.5°C | 113 mm | under 1 cm |
| November | 7.1°C | −1.6°C | 2.8°C | 112 mm | 14 cm |
| December | 1.0°C | −8.3°C | −3.6°C | 113 mm | 50 cm |
| Year | 12.0°C | 0.9°C | 6.5°C | 1,152 mm | 248 cm |
From −27.0°C to 24.5°C: March’s coldest and warmest days since 1991
Year to year, January varies most (a standard deviation of 2.5°C around −7.9°C) and August least (0.7°C).
Where Sussex’s numbers come from
Averages over 30 years, not a forecast.
- Normals: Environment and Climate Change Canada’s 1991–2020 normals, Sussex/Four Corners: the nearest of its locations with every month’s temperatures.
- Comparisons: every place of 2,500+ in Canada but the city hubs and the reserves, each on its nearest ECCC location.
- Not on this page: sunshine, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Sussex’s climate
How warm does Sussex get in summer?
On a normal day in July the thermometer climbs to 25.7°C, the warmest of the year.
How cold does Sussex get in winter?
Of all twelve months, January has the coldest nights, about −13.2°C.
How much rain and snow does Sussex get?
The year adds up to 1,152 mm. January is the peak month (116 mm) and August the low one (64 mm).
Are these figures for Sussex itself?
Yes: ECCC’s 1991–2020 normals for Sussex/Four Corners, which is in Sussex.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Sussex →
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).