Photo: Magicpiano · CC BY-SA 3.0Flatrock has some of the coolest summers among Canadian towns
In January the night’s low is typically −7.8°C. Its yearly rain and snow top those of 98% of Canadian towns. The wettest month is December; the driest is June. Frost comes on about 164 days a year, so leave time to clear the car.
These are not Flatrock’s own readings: ECCC keeps no normals there, so the page uses St. John's (Airport), 11 km south.
A year in Flatrock at a glance
Each month’s typical high and low, in °C.
What stands out about Flatrock’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Newfoundland and Labrador beside it.
What a year in Flatrock feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
164 frost days and 55 days above 20°C a year
The frost season runs October to May, and January freezes nearly every night.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 1,539 mm a year
5th wettest of 33 towns of 2,500+ in Newfoundland and Labrador. On about 162 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 363 cm in a normal year
From October to May snow is likely; January is the peak, at about 95 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Flatrock
81% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
Behind the figure: the degrees each day’s mean falls under 18°C, summed for the year.
Living with Flatrock’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
The frost-free stretch runs from about 28 May to about 18 October, some 142 days in a normal year.
The outdoor season by the averages is Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →About 19 days a year bring a wind chill under −20, when bare skin chills fast.
About 11 days a year feel above 30 on the humidex.
Thirty-year normals hide the storms and the extremes: the hazards page has Flatrock’s risks.
Flood & hazards →ECCC’s normals location: St. John's (Airport)
ECCC builds the St. John's (Airport) normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 11 km south |
| Station altitude | 141 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −22.4°C |
| Hottest reading, 1991–2020 | 31.2°C |
| Average wind | 22.0 km/h on average, most often from the west |
| Next-nearest location | St. John's (West), 22 km |
How Flatrock 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 Newfoundland and Labrador.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Flatrock’s own would show the same figures). The nearest place to Flatrock with figures is 18 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Flatrock St. John's (Airport) | 20.9°C | −7.8°C | 1,539 mm |
| St. John's 18 km · St. John's (West) | 21.3°C about the same | −7.2°C 0.6°C milder | 1,381 mm |
Flatrock 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 | −0.7°C | −7.8°C | −4.2°C | 153 mm | 95 cm |
| February | −1.0°C | −8.4°C | −4.7°C | 123 mm | 77 cm |
| March | 1.2°C | −5.7°C | −2.2°C | 140 mm | 62 cm |
| April | 5.6°C | −1.9°C | 1.8°C | 122 mm | 30 cm |
| May | 11.0°C | 1.6°C | 6.3°C | 98 mm | 5 cm |
| June | 15.7°C | 5.9°C | 10.8°C | 88 mm | 0 cm |
| July | 20.9°C | 11.2°C | 16.0°C | 100 mm | 0 cm |
| August | 20.8°C | 12.1°C | 16.5°C | 100 mm | 0 cm |
| September | 17.0°C | 8.5°C | 12.8°C | 126 mm | 0 cm |
| October | 11.2°C | 4.3°C | 7.8°C | 158 mm | 2 cm |
| November | 6.7°C | 0.0°C | 3.4°C | 157 mm | 22 cm |
| December | 2.1°C | −4.1°C | −1.0°C | 174 mm | 70 cm |
| Year | 9.2°C | 1.3°C | 5.3°C | 1,539 mm | 363 cm |
From year to year, February moves by 1.9°C, more than any month, and August least
February has the widest record range, −22.4°C in 1994 to 16.0°C in 1996; the tick on each bar is the month’s normal.
Where Flatrock’s numbers come from
Averages over 30 years, not a forecast.
- Normals: Environment and Climate Change Canada’s 1991–2020 normals, St. John's (Airport): the nearest of its locations with every month’s temperatures.
- Comparisons: every Canadian town and neighbourhood of 2,500 or more, each read from its own nearest location; city totals and reserves are left out.
- Not on this page: sunshine, which none of ECCC’s 450 locations publishes for 1991–2020, and the town’s own height above sea level, so no figure is adjusted for altitude.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Flatrock’s climate
How warm does Flatrock get in summer?
On a normal day in July the thermometer climbs to 20.9°C, the warmest of the year.
How cold does Flatrock get in winter?
In February, the coldest month, the typical low is −8.4°C.
How much rain and snow does Flatrock get?
The yearly total is about 1,539 mm. December gets 174 mm, the most of any month; June gets 88 mm, the least.
How long does snow stay on the ground?
Snow covers the ground, 1 cm or more, on about 114 days a year.
Are these figures for Flatrock itself?
Not exactly. Flatrock lacks a normals station, so St. John's (Airport) supplies the figures.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Flatrock →
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).