A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Northridge varies throughout the year. The wetter season lasts 4.0 months, from November 28 to March 29, with a greater than 11% chance of a given day being a wet day. The chance of a wet day peaks at 21% on February 20. The drier season lasts 8.0 months, from March 29 to November 28. The smallest chance of a wet day is 0% on July 2. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 21% on February 20.
The perceived humidity level in Northridge, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 2% of 2% throughout.