Rowland Heights, CA is a city located in Los Angeles County, California, where mild and dry weather persists for most of the year. In this blog post, we will take a closer look at the annual average number of rainy days, monthly average rainfall, the highest recorded rainfall, and the climate characteristics of Rowland Heights.

Annual Average Number of Rainy Days

Rowland Heights receives an average of about 35 days of rain per year. This is similar to other coastal cities in California and is considered relatively low. Rainfall is mainly concentrated in the winter and early spring, with almost no rain during the summer. However, sudden heavy rains can occur during El Niño events or monsoon seasons.

Monthly Average Rainfall

The monthly average rainfall in Rowland Heights varies greatly depending on the season and monsoon influence. The average rainfall for each month is as follows:

Rowland Heights

  • 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 rainfall, often accompanied by frequent thunderstorms.
  • Spring (March to May): Rainfall gradually decreases in spring, leading to dry weather. However, strong thunderstorms can occur in March due to monsoon influence.
  • Summer (June to August): Very dry, with short and intense rainfall occurring rarely during the monsoon season.
  • Autumn (September to November): Rainfall increases again in autumn, particularly in October and November, when monsoon influence can lead to higher rainfall.

The climate of Rowland Heights features characteristics of a coastal climate, with an annual average of 35 rainy days and monthly average rainfall varying according to seasonal and monsoon influences. Although the rainfall is relatively low, exceptional heavy rains can significantly impact transportation and daily life.