Downey (CA) Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Downey (CA). The numbers are calculated over a 30-year period to provide a reliable average. Let’s explore the details in depth to provide you with a complete overview.

Downey's climate is marked by below-average rainfall, accumulating 254 mm of precipitation yearly.

Monthly Precipitation Levels

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

Downey can be quite wet during December, receiving approximately 71 mm of precipitation over 8 rainy days.

In contrast June, experiences much drier conditions, with 0.1 mm of rainfall, spread across 0 rainy days.

December, the city’s wettest month, has a maximum daytime temperature of 20°C and receives 220 hours of sunshine. During the driest month June you can expect a temperature of 26°C. For more detailed insights into the city’s temperatures, visit our Downey 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

Downey’s average annual precipitation is 254 mm. Let’s compare this to some popular worldwide tourist destinations:

Athens, Greece, receives an average annual precipitation of 400 mm, making it one of the drier Mediterranean climates with rainfall mostly in winter.

In Shanghai, China, the annual average precipitation is 1347 mm, with a humid subtropical climate.

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

Kuala Lumpur, Malaysia, receives 2529 mm of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

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