Saint Johnʼs Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Saint Johnʼs. The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s explore all the details to give you a full picture.

On average, Saint Johnʼs receives a reasonable amount of rainfall, with an annual precipitation of 937 mm.

Monthly Precipitation Levels

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

Significant seasonal changes in precipitation occur throughout the year. During the wet season, October receives substantial rainfall, averaging 142 mm of precipitation, recorded across 20 rainy days.

In contrast, the drier season, March brings less rainfall, with 31 mm over 13 rainy days.

October, the city’s wettest month, has a maximum daytime temperature of 29°C. During the driest month March you can expect a temperature of 27°C. For more detailed insights into the city’s temperatures, visit our Saint Johnʼs Temperature page.

Annual Precipitation in Antigua & Barbuda

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

Amsterdam Precipitation Compared World Wide

Saint Johnʼs’s average annual precipitation is 937 mm. Let’s compare this to some popular worldwide tourist destinations:

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

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm of annual rainfall, mostly in the summer.

Perth, Australia, receives 565 mm of rainfall annually, mostly during the winter months.

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.

Interesting weather facts

• 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 Saint Johnʼs’s weather, including sunshine hours, humidity levels, and temperature data, visit our Saint Johnʼs Climate page.