Pasadena, CA is a city located in Los Angeles County, California, known for its beautiful architecture and rich cultural heritage.

Pasadena receives an average of about 35 days of rain per year. This is similar to Los Angeles, which is relatively low.

Rainfall is mainly concentrated in the winter and early spring, with almost no rain during the summer. Sudden heavy rains can occur during the monsoon season, but this is rare.

Monthly Average Precipitation

The monthly average precipitation in Pasadena varies greatly depending on the season and the monsoon. The average precipitation for each month is as follows:

Pasadena

  • January: about 3.0 inches
  • February: about 3.5 inches
  • March: about 2.8 inches
  • April: about 1.5 inches
  • May: about 0.7 inches
  • June: about 0.3 inches
  • July: about 0.0 inches
  • August: about 0.2 inches
  • September: about 0.3 inches
  • October: about 1.2 inches
  • November: about 2.0 inches
  • December: about 3.1 inches

Main Features:

  • Winter (December to February): The period with the most rain, with frequent thunderstorms occurring similar to coastal areas.
  • Spring (March to May): Rain gradually decreases in spring, leading to dry weather. However, strong thunderstorms can occur in March due to the monsoon.
  • Summer (June to August): Very dry, with short and intense rains occurring rarely during the monsoon season.
  • Autumn (September to November): Rain increases again in autumn, especially in October and November, when precipitation may rise due to the monsoon.

Annual Average Snowfall

Pasadena has a primarily coastal climate, resulting in very little snowfall.

Record High Rainfall and Snowfall

Record High Rainfall: The highest recorded rainfall in Pasadena occurred during a storm in January 2005, with 5.6 inches (about 142mm) of rain. This amount of rainfall led to severe flooding and inundation in the area.

Record High Snowfall: The highest recorded snowfall in Pasadena was 0.6 inches (about 15mm) of snow in February 1932. This was a very unusual event, as most weather conditions see very little snow.

Pasadena's climate features a coastal climate, with an average of 35 rainy days per year and monthly average precipitation varying greatly depending on the season and monsoon influence.