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Climate in St Johns (Canada)


Average weather, temperature, rainfall, sunshine hours

Flag - Canada

St. Johns, where it's located


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Climate chart - St Johns
The climate of St. John's is moderately continental, characterized by cold winters, with temperatures often below freezing (0 °C or 32 °F), and mild summers.
The city is located on the east coast of the island of Newfoundland, on the Avalon peninsula, and is the capital of the province of Newfoundland and Labrador. We are in the easternmost part of Canada, where the clash between sea and air currents (the Gulf Stream and the mild currents from the south-west on one side, the Labrador current and the cold currents from the north on the other) gives rise to frequent rains (and snowfalls in winter) but also to frequent fogs. In fact, St. John's is the foggiest city in Canada. Between fog, rain and snow, there can still be wintery days in spring, especially in April, but also in May, and sometimes even in June.
In addition, the clash between air masses makes the city windy.

St. Johns

On the coldest days of the year, the temperature can drop to -15 °C (5 °F) or even below. The coldest record is -23.8 °C (-10.8 °F) and was set in February 1990 and in March 1986.
On average, as high as 335 cm (11 feet) of snow fall per year, from November to April (but sometimes it can snow even in May and October).
From March to May, the Labrador current pushes icebergs off the north and east coast of the island of Newfoundland. Some of them run aground given the shallow seabed (we are in the area of the Great Banks of Newfoundland) and remain stationary for a few months. In general, to see them you need to embark, but sometimes they pass so close and are so large that they can also be seen from the coast.
On the warmest days of the year, it can reach 27/28 °C (81/82 °F), or even higher. The highest record is 31.5 °C (88.7 °F) and was set in July 1983.
From August to October, the island of Newfoundland can occasionally be hit by hurricanes of the Atlantic, which, after affecting the Caribbean, turn north-east. They generally arrive weakened because they have to cross a cold sea, however they can still bring abundant rains and strong winds.

Best Time


The best months to visit St. John's are July and August, as they are the mildest of the year.

St Johns - Climate data


In St Johns, the average temperature of the coldest month (February) is of -4.7 °C, that of the warmest month (August) is of 16.4 °C. Here are the average temperatures.
St Johns - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January-7.8-0.7-4.2
February-8.4-1-4.7
March-5.71.2-2.2
April-1.95.61.8
May1.6116.3
June5.915.710.8
July11.220.916
August12.120.816.4
September8.51712.8
October4.311.27.8
November06.73.4
December-4.12.1-1
Year1.49.35.3

Precipitation amounts to 1540 millimeters per year: it is therefore abundant. It ranges from 88.2 millimeters in the driest month (June) to 173.9 millimeters in the wettest one (December). Here is the average precipitation.
St Johns - Average precipitation
MonthRain (mm)Days
January15317
February12314
March14014
April12213
May9812
June8811
July10010
August10010
September12611
October15814
November15716
December17418
Year1540162

The sea temperature ranges from 0.5 °C in February, March to 14 °C in August. Here are the average sea temperatures.
St Johns - Sea temperature
MonthTemperatures (°C)
January1
February0.5
March0.5
April1
May3
June6
July11
August14
September13
October9.5
November6">
December3
Year5.7

There are on average around 1635 sunshine hours per year. Here are the average hours of sunshine per day.
St Johns - Sunshine hours
MonthAverageTotal
January265
February390
March3.5105
April4.5140
May5.5175
June6.5200
July7215
August6.5205
September5.5170
October4120
November2.575
December260
Year4.51635

St Johns - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


January is generally a very cold month. The average temperature is of -4.2 °C, with a minimum of -7.8 °C and a maximum of -0.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -15.5 °C. However, it dropped to -19.5 °C in January 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 9.5 °C. However, it reached 15.7 °C in January 2006.
Rain iconPrecipitation amounts to 153 mm, distributed over 17 days.
The day lasts on average 9 hours and 0 minutes.
Sun iconThere are on average 2 hours of sunshine per day. So, the sun shines 23% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 29 kph.
Sea iconThe average sea temperature is of 1 °C. Therefore, the sea is very cold for swimming.


February, the coldest month of the year, is generally a very cold month. The average temperature is of -4.7 °C, with a minimum of -8.4 °C and a maximum of -1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -16 °C. However, it dropped to -22.4 °C in February 1994.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 8 °C. However, it reached 16 °C in February 1996.
Rain iconPrecipitation amounts to 122.8 mm, distributed over 14 days.
The day lasts on average 10 hours and 20 minutes.
Sun iconThere are on average 3 hours of sunshine per day. So, the sun shines 31% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 28 kph.
Sea iconThe average sea temperature is of 0.3 °C. Therefore, the sea is very cold for swimming.


March is generally a very cold month. The average temperature is of -2.2 °C, with a minimum of -5.7 °C and a maximum of 1.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -13.5 °C. However, it dropped to -19.8 °C in March 2003.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 10 °C. However, it reached 16.8 °C in March 1999.
Rain iconPrecipitation amounts to 140.1 mm, distributed over 14 days.
The day lasts on average 12 hours and 0 minutes.
Sun iconThere are on average 3.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 27 kph.
Sea iconThe average sea temperature is of 0.3 °C. Therefore, the sea is very cold for swimming.


April is generally a cold month. The average temperature is of 1.8 °C, with a minimum of -1.9 °C and a maximum of 5.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -7.5 °C. However, it dropped to -14.1 °C in April 2008.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 15 °C. However, it reached 21 °C in April 2018.
Rain iconPrecipitation amounts to 121.6 mm, distributed over 13 days.
The day lasts on average 13 hours and 40 minutes.
Sun iconThere are on average 4.5 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 25 kph.
Sea iconThe average sea temperature is of 0.9 °C. Therefore, the sea is very cold for swimming.


May is generally a quite cold month. The average temperature is of 6.3 °C, with a minimum of 1.6 °C and a maximum of 11 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -3 °C. However, it dropped to -6.7 °C in May 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 21 °C. However, it reached 27.6 °C in May 2020.
Rain iconPrecipitation amounts to 98.1 mm, distributed over 12 days.
The day lasts on average 15 hours and 10 minutes. So the days are long.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 37% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 22 kph.
Sea iconThe average sea temperature is of 2.8 °C. Therefore, the sea is very cold for swimming.


June is generally a mild month. The average temperature is of 10.8 °C, with a minimum of 5.9 °C and a maximum of 15.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0 °C. However, it dropped to -2.3 °C in June 2012.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 24.5 °C. However, it reached 27.8 °C in June 1999.
Rain iconPrecipitation amounts to 88.2 mm, distributed over 11 days.
The day lasts on average 15 hours and 55 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of 22 kph.
Sea iconThe average sea temperature is of 6 °C. Therefore, the sea is very cold for swimming.


July is generally a very mild month. The average temperature is of 16 °C, with a minimum of 11.2 °C and a maximum of 20.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 5 °C. However, it dropped to 1.1 °C in July 2012.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27.5 °C. However, it reached 31.2 °C in July 2013.
Rain iconPrecipitation amounts to 100.1 mm, distributed over 10 days.
The day lasts on average 15 hours and 30 minutes. So the days are long.
Sun iconThere are on average 7 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 21 kph.
Sea iconThe average sea temperature is of 10.8 °C. Therefore, the sea is very cold for swimming.


August, the warmest month of the year, is generally a very mild month. The average temperature is of 16.4 °C, with a minimum of 12.1 °C and a maximum of 20.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 6 °C. However, it dropped to 2.3 °C in August 2002.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 27.5 °C. However, it reached 31 °C in August 1996.
Rain iconPrecipitation amounts to 99.8 mm, distributed over 10 days.
The day lasts on average 14 hours and 10 minutes. So the days are long.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 21 kph.
Sea iconThe average sea temperature is of 14.2 °C. Therefore, the sea is very cold for swimming.


September is generally a mild month. The average temperature is of 12.8 °C, with a minimum of 8.5 °C and a maximum of 17 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 2.5 °C. However, it dropped to 0.6 °C in September 1995.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 24.5 °C. However, it reached 29.5 °C in September 2001.
Rain iconPrecipitation amounts to 125.8 mm, distributed over 11 days.
The day lasts on average 12 hours and 30 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 22 kph.
Sea iconThe average sea temperature is of 12.9 °C. Therefore, the sea is very cold for swimming.


October is generally a quite mild month. The average temperature is of 7.8 °C, with a minimum of 4.3 °C and a maximum of 11.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -1.5 °C. However, it dropped to -5.4 °C in October 1999.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 20 °C. However, it reached 25.5 °C in October 2020.
Rain iconPrecipitation amounts to 158.1 mm, distributed over 14 days.
The day lasts on average 10 hours and 50 minutes.
Sun iconThere are on average 4 hours of sunshine per day. So, the sun shines 36% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 24 kph.
Sea iconThe average sea temperature is of 9.4 °C. Therefore, the sea is very cold for swimming.


November is generally a cold month. The average temperature is of 3.4 °C, with a minimum of 0 °C and a maximum of 6.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -6.5 °C. However, it dropped to -13.4 °C in November 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 16 °C. However, it reached 19.2 °C in November 2006.
Rain iconPrecipitation amounts to 157.4 mm, distributed over 16 days.
The day lasts on average 9 hours and 20 minutes.
Sun iconThere are on average 2.5 hours of sunshine per day. So, the sun shines 27% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 26 kph.
Sea iconThe average sea temperature is of 5.9 °C. Therefore, the sea is very cold for swimming.


December is generally a very cold month. The average temperature is of -1 °C, with a minimum of -4.1 °C and a maximum of 2.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -12 °C. However, it dropped to -17.3 °C in December 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 12 °C. However, it reached 17.9 °C in December 2017.
Rain iconPrecipitation amounts to 173.9 mm, distributed over 18 days.
The day lasts on average 8 hours and 30 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
Sun iconThere are on average 2 hours of sunshine per day. So, the sun shines 24% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 28 kph.
Sea iconThe average sea temperature is of 2.9 °C. Therefore, the sea is very cold for swimming.

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