St. John's Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in St. John's. The numbers are calculated over a 30-year period to provide a reliable average. Let's now guide you through the details for a complete overview.

St. John's is known for its substantial rain/snowfall, with annual precipitation reaching 1268 mm.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

St. John's offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between December (136 mm) and June (77 mm) is not too significant, making the climate enjoyable for visitors and residents alike.

December, the wettest month, has a maximum daytime temperature of 4°C. The city receives 62 hours of sunshine in this period. During the driest month June you can expect a temperature of 14°C. For more detailed insights into the city’s temperatures, visit our St. John's Temperature page.

Annual Precipitation in Canada

The map below shows the annual precipitation across Canada. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

St. John's’s average annual precipitation is 1268 mm. Let’s compare this to some popular worldwide tourist destinations:

Chicago, USA, sees an annual precipitation of 1062 mm, with rain and snow contributing to its humid climate.

In Seoul, South Korea, the average annual precipitation is 1237 mm, with most rain falling during the summer monsoon season.

Melbourne, Australia, has 690 mm of rainfall annually, spread fairly evenly throughout the year.

Ho Chi Minh City, Vietnam, receives 1955 mm of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Sea vs. Land Precipitation

The proximity of a location to a large body of water can significantly affect its rainfall patterns:

• Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
• Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.

For more detailed information about St. John's’s weather, including sunshine hours, humidity levels, and temperature data, visit our St. John's Climate page.