Climate and monthly weather forecastSt. John's, Canada
Climate and monthly weather forecast
The climate of St. John's
St. John's, Canada finds itself geographically positioned in a region characterized by a humid continental climate, according to the Köppen climate classification. This climate type, specifically noted as Dfb, is distinct in its feature of no dry season and the warm summer period. Weather patterns throughout the year observe substantial fluctuations in temperature, rainfall, and snowfall.Temperatures typically exhibit a modest range, with values dipping from as low as -8.2°C (17.2°F) in the colder months to highs reaching up to 20.7°C (69.3°F) during warmer periods. The average low temperatures are more frequent during the beginning and ending quarters of the year, with the lowest recorded in February at -8.6°C (16.5°F). On the other hand, the highest temperature is likely to be felt in July at 20.7°C (69.3°F).
Rainfall, while somewhat distributed throughout the year, tends towards higher volumes from September to December, peaking at 154mm (6.06") in October. Decreased levels of rainfall are more common between January and August with the thinner volumes recorded in February at 62mm (2.44"). Correspondingly, rainfall days are also greatest in October, with an average of 18.1 days.
Another unique aspect of St. John's weather is its snowfall, which is a prevalent feature of its colder months. Snowfall begins in November and can extend up to April. The height of the snow season is in January with 887mm (34.92") on average.
The best time to visit St. John's
For optimal weather conditions, it's recommended to visit St. John's between June and August. During this period, temperatures are at their warmest, fluctuating from 15.8°C (60.4°F) to 20.7°C (69.3°F). Similarly, sea temperatures in this time period range from warm 10.9°C (51.6°F) to 13.9°C (57°F), strewing the path for numerous maritime activities. This period also sees the longest daylight hours, ranging from 15.1 hours to 15.9 hours, ensuring maximized outdoor exploration opportunities.The worst time to visit St. John's
Travellers may find the climate particularly challenging between December and February. These months observe the coldest weather with temperatures descending to lows between -8.2°C (17.2°F) and -1.1°C (30°F). These periods also witness substantial snowfall with the peak levels up to 887mm (34.92") in December. Cold sea temperatures can make maritime activities less enjoyable.Spring weather in St. John's
Spring in St. John's, extends from March to May, where temperatures observe a gradual upswing from 1°C (33.8°F) to 11.1°C (52°F). Rainfall presents a similar trend of rising from 85mm (3.35") in March to 98mm (3.86") by May. The period also tends to observe a decline in snowfall from 573mm (22.56") to a mere 44mm (1.73") by the end of May, signalling the onset of the warmer summer season.Summer weather in St. John's
Summers in St. John's, spanning June through August, provide most reliable warm conditions. Temperatures in this period often fluctuate from 15.8°C (60.4°F) to the peak of 20.7°C (69.3°F) in July. Rainfall during the summer months stays relatively constant in the range of 98mm (3.86") to 92mm (3.62"). Sea temperatures and the number of sunshine hours both reach their maximums, providing plenty of opportunity for outdoor activity.Autumn weather in St. John's
Autumn weather from September to November in St. John's is marked by a steady decline in temperatures from 16.5°C (61.7°F) to a chilly 6.4°C (43.5°F). This period also sees a rise in rainfall, peaking at 154mm (6.06") in October. It’s the season where outdoor enthusiasts experience shorter daylight hours, from 12.6 hours to 9.3 hours in November.Winter weather in St. John's
Winter in St. John's spans from December to February. During these months, temperatures drop to an average low between -8.2°C (17.2°F) and -1.1°C (30°F). Snowfall is particularly high, with December seeing as much as 887mm (34.92"). Daylight hours are at their shortest between 8.5 to 9 hours and sea temperatures drop to their lowest of 0.9°C (33.6°F) to -0.2°C (31.6°F). This period is perhaps the most challenging for visits due to the harsh weather conditions.Weather in January
The weather in January in St. John's heralds the onset of deep winter, showcasing landscapes transformed by thick snowfall. Notably, it is the coldest month of the year, evidenced by an average low of -8.2°C (17.2°F) and a high of -0.8°C (30.6°F). Weather in January »Weather in February
The cool breeze of February follows its predecessor, continuing with the snowy tradition, lending the city a beautiful, serene ambiance. While the temperatures remain low, a slight elevation can be noticed with the low temperature settling at -8.6°C (16.5°F), and the high at -1.1°C (30°F). Weather in February »Weather in March
March signifies the shift from harsh winters to early springs, a transition noticeable in St. John's weather changes. It is discernible through a measured rise in temperatures, with the high moving up to 1°C (33.8°F) and the low to -6.1°C (21°F). Weather in March »Weather in April
April beholds the real charm of spring in St. John's, with the city offering a variety of outdoor activities. The winter chill starts to recede, shown by the high temperature moving up to a comfortable 5.6°C (42.1°F) and the low rising to -1.9°C (28.6°F). Weather in April »Weather in May
The merry month of May welcomes the summer season to St. John's, displaying landscapes drenched with sunlight. The high temperature reaches up to 11.1°C (52°F), and the low temperature up to 1.7°C (35.1°F), making this the first month of the year with no sub-zero temperatures. Weather in May »Weather in June
June stands as the month residents of St. John's look forward to, with the city gleaming under the summer sun. High temperatures reach a pleasant 15.8°C (60.4°F) and low temperatures record a comfortable 5.9°C (42.6°F). It is an unmatched time for hosting outdoor events, pool parties, and indulging in water-sport activities. Weather in June »Weather in July
July presents itself as the zenith of the summer season in St. John's, marked by warm days and pleasant nights. Experiencing the highest temperatures of the year, the high records 20.7°C (69.3°F), and the low reaches 10.9°C (51.6°F). Weather in July »Weather in August
Even with slightly receding temperatures, August in St. John's relishes the traits of summer weather. A shift can be noticed in temperatures, with the high moving slightly down to 20.5°C (68.9°F) and the low to 11.6°C (52.9°F). Weather in August »Weather in September
September marks the beginning of fall in St. John's, hinting at incoming cooler temperatures. The high temperature takes a dip down to 16.5°C (61.7°F), and the low to 8.2°C (46.8°F). While days become shorter, the ambiance turns breezy and pleasant. Weather in September »Weather in October
October in St. John's depicts the splendor of the fall season, with landscapes painted in hues of red and gold. The noticeable shift in temperature with the high registering at a cooler 10.8°C (51.4°F) and to the low moving down to 3.9°C (39°F). Weather in October »Weather in November
November represents transitions from fall to early winters in St. John's, preparing its residents for colder days ahead. The high and low temperatures make a noticeable drop down to 6.4°C (43.5°F) and -0.3°C (31.5°F), respectively. Weather in November »Weather in December
December in St. John's welcomes the winter season, featuring amplifying cold temperatures and snowfall. The high temperature drops to 1.8°C (35.2°F), while the low plunges to a chilly -4.7°C (23.5°F). Days become significantly shorter as daylight ticks away earlier. Weather in December »Updated: Feb 5, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In St. John's, during the entire year, the rain falls for 162.7 days and collects up to 1207mm (47.52") of precipitation.
Months with snowfall are January through June, October through December.
January is the month with the most snowfall in St. John's. Snow falls for 18.3 days and accumulates 887mm (34.92") of snow.
Throughout the year, there are 79 snowfall days, and 3349mm (131.85") of snow is accumulated.
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in St. John's.
In St. John's, February is known for its average lowest temperatures, reaching a high of -1.1°C (30°F) and a low of -8.6°C (16.5°F).
February is the month with the least rainfall in St. John's. Rain falls for 8.6 days and accumulates 62mm (2.44") of precipitation.
The month with the coldest seawater in St. John's is March, with an average sea temperature of -0.4°C (31.3°F).
On Sunday, 10. March 2024, at 2:00 am, Daylight Saving Time starts in St. John's, Canada, and the time zone changes from NST to NDT. Daylight Saving Time ends on Sunday, 03. November 2024, at 2:00 am, and the time zone reverts from NDT to NST.
June has the longest days of the year, with an average of 15h and 54min of daylight.
June and July, with an average maximum UV index of 7, are months with the highest UV index in St. John's.
July, known for its average high temperature of 20.7°C (69.3°F) and an average low temperature of 10.9°C (51.6°F), is the warmest month.
July through September are months without snowfall in St. John's, Canada.
The month with the most sunshine in St. John's, Canada, is July, with an average of 7h of sunshine.
August is the month with the warmest seawater in St. John's, Canada, with an average sea temperature of 13.9°C (57°F).
The month with the most rainfall is October, when the rain falls for 18.1 days and typically aggregates up to 154mm (6.06") of precipitation.
With an average of 8h and 30min of daylight, December has the shortest days of the year.
The month with the least sunshine is December, with an average of 2h of sunshine.
Average temperature
St. John's, Canada
The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is February (-1.1°C).
The month with the highest average low temperature is August (11.6°C).
The coldest month (with the lowest average low temperature) is February (-8.6°C).
Average rainfall
St. John's, Canada
- Average rainfall in January:
66mm - Average rainfall in February:
61.6mm - Average rainfall in March:
84.8mm - Average rainfall in April:
96.1mm - Average rainfall in May:
97.9mm - Average rainfall in June:
97.5mm
- Average rainfall in July:
91.6mm - Average rainfall in August:
100mm - Average rainfall in September:
129.6mm - Average rainfall in October:
153.7mm - Average rainfall in November:
124.8mm - Average rainfall in December:
102.9mm
The wettest month (with the highest rainfall) is October (153.7mm).
The driest month (with the least rainfall) is February (61.6mm).
Average rainfall days
St. John's, Canada
- Average rainfall days in January:
9.3 days - Average rainfall days in February:
8.6 days - Average rainfall days in March:
11 days - Average rainfall days in April:
13.9 days - Average rainfall days in May:
15.9 days - Average rainfall days in June:
14.7 days
- Average rainfall days in July:
13.6 days - Average rainfall days in August:
13.7 days - Average rainfall days in September:
15.5 days - Average rainfall days in October:
18.1 days - Average rainfall days in November:
15.7 days - Average rainfall days in December:
12.7 days
The month with the highest number of rainy days is October (18.1 days).
The month with the least rainy days is February (8.6 days).
Average snowfall
St. John's, Canada
- Average snowfall in January:
887mm - Average snowfall in February:
710mm - Average snowfall in March:
573mm - Average snowfall in April:
253mm - Average snowfall in May:
44mm - Average snowfall in June:
0.4mm
The month with the highest snowfall is January (887mm).
The months with the least snowfall are July, August and September (0mm).
Average snowfall days
St. John's, Canada
- Average snowfall days in January:
18.3 days - Average snowfall days in February:
14.6 days - Average snowfall days in March:
13.3 days - Average snowfall days in April:
7 days - Average snowfall days in May:
2.1 days - Average snowfall days in June:
0.1 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
1.4 days - Average snowfall days in November:
7.6 days - Average snowfall days in December:
14.6 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are July, August and September (0 days).
Average sea temperature
St. John's, Canada
The best month for swimming (with the highest average sea temperature) is August (13.9°C).
The coldest month (with the lowest average sea temperature) is March (-0.4°C).
Average daylight / Average sunshine
St. John's, Canada
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 6min - Average daylight in June:
15h and 54min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
2h and 6min - Average sunshine in February:
3h and 12min - Average sunshine in March:
3h and 30min - Average sunshine in April:
4h and 42min - Average sunshine in May:
5h and 42min - Average sunshine in June:
6h and 36min
- Average sunshine in July:
7h - Average sunshine in August:
6h and 42min - Average sunshine in September:
5h and 42min - Average sunshine in October:
3h and 54min - Average sunshine in November:
2h and 30min - Average sunshine in December:
2h
The month with the most sunshine is July (Average sunshine: 7h).
The month with the least sunshine is December (Average sunshine: 2h).
Average UV index
St. John's, Canada
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, November and December (UV index 1).
