Shifting Climate - Warmer & Drier Later

For San Francisco, the new climate normal period of 1991-2020 is both drier and warmer than previously (1981-2010). The hottest day of the year was 70.4° on September 24th, and it is now 70.6° and a week later on October 1st.

And San Francisco's rainfall season is now slightly (3%) less and delayed by about a week. The new normal date for the first 2" of rain for the season is now November 14th, compared to November 8th.

Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services
Twitter: @ggweather