Oregon (OH) Rainfall & Precipitation: Monthly Averages and Year-Round Insights
This page shows both the average monthly rainfall and the number of rainy days in Oregon, Ohio, United States of America. This average is based on long-term data collected between 1990 and 2020. Now, let’s explore all the details to give you a full picture.
Oregon has a notably wet climate with abundant precipitation, recording 1018 mm of rain/snowfall per year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm)
Oregon offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between June (119 mm) and January (62 mm) is not too significant, making the climate enjoyable for visitors and residents alike.
June, the wettest month, has a maximum daytime temperature of 27°C. The city receives 286 hours of sunshine in this period. During the driest month January you can expect a temperature of 1°C. For more detailed insights into the city’s temperatures, visit our Oregon 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
Oregon’s average annual precipitation is 1018 mm. Let’s compare this to some popular worldwide tourist destinations:
Boston, USA, experiences 1238 mm of annual precipitation, including significant snowfall during the winter.
Osaka, Japan, experiences 1507 mm of rainfall annually, spread across the year with wetter summers.
In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.
Mumbai, India, experiences a tropical monsoon climate with 1860 mm of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.
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.
Global Precipitation Patterns
Tropical Rainforests: In tropical regions, rainfall is generally abundant year-round. Areas near the equator, like the Amazon rainforest, can receive up to 3000 mm of rain annually.
Desert Regions: Deserts such as the Sahara and Arabian deserts typically see less than 250 mm of rainfall annually. Rainfall tends to be infrequent, but when it does occur, it is often intense.
Temperate Zones: In temperate regions, precipitation tends to be more evenly distributed, though areas closer to the ocean may see more rain in the winter months, and areas further inland experience drier summers.
Polar Regions: Precipitation in polar regions, like Antarctica, is extremely low, often falling as snow. Average annual precipitation in Antarctica is less than 200 mm, with some areas receiving as little as 50 mm annually.
For more detailed information about Oregon (OH)’s weather, including sunshine hours, humidity levels, and temperature data, visit our Oregon (OH) Climate page.