April weather forecastThunder Bay, Canada
April
Weather in April
In April, the weather in Thunder Bay experiences noticeable warming. The last of winter’s snow melts away, replaced by increased rainfall at 37mm (1.46"). The longer hours of daylight accompanied by reduced snowfall facilitate the awakening of the city’s flora. This change makes it an ideal time for outdoor exploration and enjoying the refreshing spring air.Temperature
Thunder Bay's weather experiences a significant temperature rise with the arrival of April, soaring from a cold 0.6°C (33.1°F) in March to a chilly 9.2°C (48.6°F). The average low-temperature reading in April for Thunder Bay reflects a significant fall from the daytime highs, stabilizing at a freezing cold -3.2°C (26.2°F).Rainfall
In Thunder Bay, Canada, in April, during 7.1 rainfall days, 37mm (1.46") of precipitation is typically accumulated. Throughout the year, there are 92.6 rainfall days, and 547mm (21.54") of precipitation is accumulated.Snowfall
Months with snowfall in Thunder Bay are January through May, September through December. In Thunder Bay, Canada, in April, snow falls for 4 days, with typically accumulated 103mm (4.06") of snow. Throughout the year, there are 62.7 snowfall days, and 1631mm (64.21") of snow is accumulated.Sea temperature
The months with the coldest seawater are January through April, with an average sea temperature of 2°C (35.6°F).Note: In connection with swimming, this state is severely cold, hazardous, and lethal. Without protective insulated waterproof garments, hypothermia sets in rapidly.
Daylight
In Thunder Bay, Canada, the average length of the day in April is 13h and 43min.On the first day of the month, sunrise is at 7:33 am and sunset at 8:28 pm. On the last day of April, in Thunder Bay, Canada, sunrise is at 6:37 am and sunset at 9:10 pm EDT.
Sunshine
The average sunshine in April in Thunder Bay, Canada, is 7.1h.UV index
The average daily maximum UV index in April is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: In April, the maximum UV index of 4 translates into these guidelines:
Act with care - The suggestion to avoid sunburn is emphasized. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Thunder Bay, Canada
- Average high temperature in April: 9.2°C
The warmest month (with the highest average high temperature) is July (24.3°C).
The month with the lowest average high temperature is January (-8°C).
- Average low temperature in April: -3.2°C
The month with the highest average low temperature is July (11.1°C).
The coldest month (with the lowest average low temperature) is January (-20.6°C).
Average rainfall in April
Thunder Bay, Canada
- Average rainfall in April: 36.6mm
The wettest month (with the highest rainfall) is August (89.5mm).
The driest month (with the least rainfall) is January (0.4mm).
Average rainfall days in April
Thunder Bay, Canada
- Average rainfall days in April: 7.1 days
The month with the highest number of rainy days is June (13.8 days).
The month with the least rainy days is January (0.6 days).
Average snowfall in April
Thunder Bay, Canada
- Average snowfall in April: 103mm
The month with the highest snowfall is December (389mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in April
Thunder Bay, Canada
- Average snowfall days in April: 4 days
The month with the highest number of snowfall days is December (13.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average sea temperature in April
Thunder Bay, Canada
- Average sea temperature in April: 2°C
The best months for swimming (with the highest average sea temperature) are August and September (13°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (2°C).
Average daylight in April /
Average sunshine in April
Thunder Bay, Canada
- Average daylight in April: 13h and 42min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in April: 7h and 6min
The month with the most sunshine is June (Average sunshine: 8h and 42min).
The months with the least sunshine are November and December (Average sunshine: 2h and 54min).
Average UV index in April
Thunder Bay, Canada
- Average UV index in April: 4
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 1).
