Climate - St Johns (Canada)
Average weather, temperature, rainfall, sunshine hours
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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.
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.
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 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.
The average temperature of the coldest month (February) is of -4.5 °C (24 °F), that of the warmest month (August) is of 16.5 °C (61.5 °F). Here are the average temperatures.
St Johns - Average temperatures (1991-2020) | Month | Min (°C) | Max (°C) | Mean (°C) | Min (°F) | Max (°F) | Mean (°F) |
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| January | -7.9 | -0.4 | -4.2 | 18 | 31 | 24.5 |
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| February | -8.4 | -0.8 | -4.6 | 17 | 31 | 23.7 |
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| March | -6.1 | 1.2 | -2.4 | 21 | 34 | 27.6 |
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| April | -2.1 | 5.6 | 1.7 | 28 | 42 | 35.2 |
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| May | 1.4 | 10.9 | 6.2 | 35 | 52 | 43.1 |
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| June | 5.8 | 15.8 | 10.8 | 42 | 60 | 51.4 |
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| July | 11 | 20.9 | 16 | 52 | 70 | 60.7 |
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| August | 12 | 20.9 | 16.4 | 54 | 70 | 61.6 |
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| September | 8.4 | 17.1 | 12.8 | 47 | 63 | 55 |
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| October | 4.1 | 11.4 | 7.8 | 39 | 53 | 46 |
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| November | 0 | 6.9 | 3.4 | 32 | 44 | 38.2 |
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| December | -4.4 | 2 | -1.2 | 24 | 36 | 29.8 |
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| Year | 1.2 | 9.4 | 5.25 | 34.2 | 48.8 | 41.5 |
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Precipitation amounts to 1,535 millimeters (60.4 inches) per year: it is therefore abundant. It ranges from 90 mm (3.5 in) in the driest month (July) to 165 mm (6.5 in) in the wettest (December). 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). Here is the average precipitation.
St Johns - Average precipitation| Month | Millimeters | Inches | Days |
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| January | 150 | 5.9 | 22 |
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| February | 130 | 5.1 | 19 |
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| March | 140 | 5.5 | 20 |
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| April | 125 | 4.9 | 17 |
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| May | 105 | 4.1 | 17 |
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| June | 100 | 3.9 | 15 |
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| July | 90 | 3.5 | 14 |
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| August | 100 | 3.9 | 14 |
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| September | 130 | 5.1 | 16 |
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| October | 155 | 6.1 | 19 |
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| November | 150 | 5.9 | 20 |
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| December | 165 | 6.5 | 22 |
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| Year | 1535 | 60.4 | 212 |
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On average, there are around 1,635 sunshine hours per year. Here are the average sunshine hours per day.
St Johns - Sunshine hours| Month | Average | Total |
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January | 2 | 65 | February | 3 | 90 | March | 3.5 | 105 | April | 4.5 | 140 | May | 5.5 | 175 | June | 6.5 | 200 | July | 7 | 215 | August | 6.5 | 205 | September | 5.5 | 170 | October | 4 | 120 | November | 2.5 | 75 | December | 2 | 60 | Year | 4.5 | 1635 |
The sea temperature ranges between 0.5 °C (33 °F) and 14 °C (57 °F). So, it is cold all year round.
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. Here are the average sea temperatures.
St Johns - Sea temperature| Month | Celsius (°C) | Fahrenheit (°F) |
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January | 1 | 34 | February | 0.5 | 33 | March | 0.5 | 33 | April | 1 | 34 | May | 3 | 37 | June | 6 | 43 | July | 11 | 51 | August | 14 | 58 | September | 13 | 55 | October | 9.5 | 49 | November | 6 | 43 | December | 3 | 37 | Year | 5.7 | 42.2 |
Best Time
The best months to visit St. John's are July and August, as they are the mildest of the year.
St Johns - Weather by month
Based on the period 1991-2020
In January, the weather in St Johns is usually very cold. The average temperature is of -4.2 °C (25 °F), with a minimum of -7.9 °C (17.8 °F) and a maximum of -0.4 °C (31.3 °F).
On the coldest nights of the month, the temperature usually drops to around -15.5 °C (4 °F). However, it dropped to -19.5 °C (-3.1 °F) in January 1993.
On the warmest days of the month, the temperature usually reaches around 9.5 °C (48.5 °F). However, it reached 15.7 °C (60.3 °F) in January 2006.
Precipitation amounts to 150 mm (5.9 in), distributed over 22 days.
The day lasts on average 9 hours and 0 minutes.
There 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 29 kph (18 mph).
The average sea temperature is of 1 °C (34 °F). Therefore, the sea is very cold for swimming.
In February, the coldest month of the year, the weather in St Johns is usually very cold. The average temperature is of -4.6 °C (24 °F), with a minimum of -8.4 °C (16.9 °F) and a maximum of -0.8 °C (30.6 °F).
On the coldest nights of the month, the temperature usually drops to around -16 °C (3 °F). However, it dropped to -22.4 °C (-8.3 °F) in February 1994.
On the warmest days of the month, the temperature usually reaches around 8 °C (46.5 °F). However, it reached 16 °C (60.8 °F) in February 1996.
Precipitation amounts to 130 mm (5.1 in), distributed over 19 days.
The day lasts on average 10 hours and 20 minutes.
There 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 28 kph (17 mph).
The average sea temperature is of 0.5 °C (32.5 °F). Therefore, the sea is very cold for swimming.
In March, the weather in St Johns is usually very cold. The average temperature is of -2.4 °C (28 °F), with a minimum of -6.1 °C (21 °F) and a maximum of 1.2 °C (34.2 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -13.5 °C (7.5 °F). However, it dropped to -19.8 °C (-3.6 °F) in March 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 10 °C (50 °F). However, it reached 16.8 °C (62.2 °F) in March 1999.
Precipitation amounts to 140 mm (5.5 in), distributed over 20 days.
The day lasts on average 12 hours and 0 minutes.
There 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 27 kph (17 mph).
The average sea temperature is of 0.5 °C (32.5 °F). Therefore, the sea is very cold for swimming.
In April, the weather in St Johns is usually cold. The average temperature is of 1.8 °C (35 °F), with a minimum of -2.1 °C (28.2 °F) and a maximum of 5.6 °C (42.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -7.5 °C (18.5 °F). However, it dropped to -14.1 °C (6.6 °F) in April 2008.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 15 °C (59 °F). However, it reached 21 °C (69.8 °F) in April 2018.
Precipitation amounts to 125 mm (4.9 in), distributed over 17 days.
The day lasts on average 13 hours and 40 minutes.
There 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 25 kph (16 mph).
The average sea temperature is of 1 °C (33.5 °F). Therefore, the sea is very cold for swimming.
In May, the weather in St Johns is usually quite cold. The average temperature is of 6.2 °C (43 °F), with a minimum of 1.4 °C (34.5 °F) and a maximum of 10.9 °C (51.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -3 °C (26 °F). However, it dropped to -6.7 °C (19.9 °F) in May 1993.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 21 °C (70 °F). However, it reached 27.6 °C (81.7 °F) in May 2020.
Precipitation amounts to 105 mm (4.1 in), distributed over 17 days.
The day lasts on average 15 hours and 10 minutes. So the days are long.
There 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 22 kph (14 mph).
The average sea temperature is of 3 °C (37 °F). Therefore, the sea is very cold for swimming.
In June, the weather in St Johns is usually mild. The average temperature is of 10.8 °C (51 °F), with a minimum of 5.8 °C (42.4 °F) and a maximum of 15.8 °C (60.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 0 °C (32 °F). However, it dropped to -2.3 °C (27.9 °F) in June 2012.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 24.5 °C (76.5 °F). However, it reached 27.8 °C (82 °F) in June 1999.
Precipitation amounts to 100 mm (3.9 in), distributed over 15 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.
There 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 22 kph (14 mph).
The average sea temperature is of 6 °C (43 °F). Therefore, the sea is very cold for swimming.
In July, the weather in St Johns is usually very mild. The average temperature is of 16.0 °C (61 °F), with a minimum of 11 °C (51.8 °F) and a maximum of 20.9 °C (69.6 °F).
On the coldest nights of the month, the temperature usually drops to around 5 °C (41 °F). However, it dropped to 1.1 °C (34 °F) in July 2012.
On the warmest days of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 31.2 °C (88.2 °F) in July 2013.
Precipitation amounts to 90 mm (3.5 in), distributed over 14 days.
The day lasts on average 15 hours and 30 minutes. So the days are long.
There 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 21 kph (13 mph).
The average sea temperature is of 11 °C (51.5 °F). Therefore, the sea is very cold for swimming.
In August, the warmest month of the year, the weather in St Johns is usually very mild. The average temperature is of 16.4 °C (62 °F), with a minimum of 12 °C (53.6 °F) and a maximum of 20.9 °C (69.6 °F).
On the coldest nights of the month, the temperature usually drops to around 6 °C (43 °F). However, it dropped to 2.3 °C (36.1 °F) in August 2002.
On the warmest days of the month, the temperature usually reaches around 27.5 °C (81 °F). However, it reached 31 °C (87.8 °F) in August 1996.
Precipitation amounts to 100 mm (3.9 in), distributed over 14 days.
The day lasts on average 14 hours and 10 minutes. So the days are long.
There 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 21 kph (13 mph).
The average sea temperature is of 14 °C (57.5 °F). Therefore, the sea is very cold for swimming.
In September, the weather in St Johns is usually mild. The average temperature is of 12.8 °C (55 °F), with a minimum of 8.4 °C (47.1 °F) and a maximum of 17.1 °C (62.8 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 2.5 °C (36.5 °F). However, it dropped to 0.6 °C (33.1 °F) in September 1995.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 24.5 °C (76.5 °F). However, it reached 29.5 °C (85.1 °F) in September 2001.
Precipitation amounts to 130 mm (5.1 in), distributed over 16 days.
The day lasts on average 12 hours and 30 minutes.
There 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 22 kph (14 mph).
The average sea temperature is of 13 °C (55 °F). Therefore, the sea is very cold for swimming.
In October, the weather in St Johns is usually quite mild. The average temperature is of 7.8 °C (46 °F), with a minimum of 4.1 °C (39.4 °F) and a maximum of 11.4 °C (52.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -1.5 °C (29.5 °F). However, it dropped to -5.4 °C (22.3 °F) in October 1999.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 20 °C (68.5 °F). However, it reached 25.5 °C (77.9 °F) in October 2020.
Precipitation amounts to 155 mm (6.1 in), distributed over 19 days.
The day lasts on average 10 hours and 50 minutes.
There 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 24 kph (15 mph).
The average sea temperature is of 9.5 °C (49 °F). Therefore, the sea is very cold for swimming.
In November, the weather in St Johns is usually cold. The average temperature is of 3.4 °C (38 °F), with a minimum of 0 °C (32 °F) and a maximum of 6.9 °C (44.4 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -6.5 °C (20.5 °F). However, it dropped to -13.4 °C (7.9 °F) in November 1993.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 16 °C (61 °F). However, it reached 19.2 °C (66.6 °F) in November 2006.
Precipitation amounts to 150 mm (5.9 in), distributed over 20 days.
The day lasts on average 9 hours and 20 minutes.
There 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 26 kph (16 mph).
The average sea temperature is of 6 °C (42.5 °F). Therefore, the sea is very cold for swimming.
In December, the weather in St Johns is usually very cold. The average temperature is of -1.2 °C (30 °F), with a minimum of -4.4 °C (24.1 °F) and a maximum of 2 °C (35.6 °F).
On the coldest nights of the month, the temperature usually drops to around -12 °C (11 °F). However, it dropped to -17.3 °C (0.9 °F) in December 1991.
On the warmest days of the month, the temperature usually reaches around 12 °C (54 °F). However, it reached 17.9 °C (64.2 °F) in December 2017.
Precipitation amounts to 165 mm (6.5 in), distributed over 22 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.
There 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 28 kph (17 mph).
The average sea temperature is of 3 °C (37 °F). Therefore, the sea is very cold for swimming.
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