Portland (ME) Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Portland (ME). 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.

Portland has a notably wet climate with abundant precipitation, recording 1415 mm of rain/snowfall per year.

Monthly Precipitation Levels

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

The amount of precipitation varies moderately throughout the year. The wettest month, June, sees around 156 mm of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, January, still receives a respectable 87 mm of snowfall.

June, the city’s wettest month, has a maximum daytime temperature of 22°C. During the driest month January you can expect a temperature of 0°C. For more detailed insights into the city’s temperatures, visit our Portland Temperature page.

Annual Precipitation in the United States of America

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

Amsterdam Precipitation Compared World Wide

Portland’s average annual precipitation is 1415 mm. Let’s compare this to some popular worldwide tourist destinations:

New York City, USA, receives 1276 mm of rainfall annually, with precipitation evenly distributed throughout the year.

Osaka, Japan, experiences 1507 mm of rainfall annually, spread across the year with wetter summers.

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

Singapore, situated near the equator, gets 2581 mm of rainfall annually, with no distinct dry season and consistent monthly precipitation.

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 Portland (ME)’s weather, including sunshine hours, humidity levels, and temperature data, visit our Portland (ME) Climate page.