St. John's (NL) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in St. John's, Newfoundland and Labrador, Canada. Long-term data from 1990 to 2020 was used to calculate these averages. Let's explore the details to provide you with a complete overview.

St. John's is known for its substantial rain/snowfall, with annual precipitation reaching 1268 mm (50 in).

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

St. John's offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between December (136 mm (5.4 in)) and June (77 mm (3 in)) 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 (39°F). The city receives 62 hours of sunshine in this period. During the driest month June you can expect a temperature of 14°C (57°F). For more detailed insights into the city's temperatures, visit our St. John's Temperature page.

St. John's's average annual precipitation is 1268 mm (50 in). Let's compare this to some popular worldwide tourist destinations:

The city of Rome, Italy, has an average annual precipitation of 832 mm (33 in), spread fairly evenly throughout the year.

In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.

Adelaide, Australia, enjoys 511 mm (20 in) of annual precipitation, with dry summers and wet winters.

Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

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.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

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