May 19, 2016
Rain Patterns at Mount Diablo: What 60 years of rain data tells us about the Northern California drought
Immediately I began to think back to our time living in Northern California and the historic drought conditions. I decided to use Mount Diablo as a representative weather station because it was one of the most complete and oldest in the Bay Area.
I decided to use this visualisation as inspiration for a version of my own. Some interesting patterns reveal themselves:
- It hardly ever rains between the end of May and early October.
- The most single-day rain total in the last 60 years was 5 inches on 21-Jan-1967.
- Out of the 21,404 days in the data set, only 3,892 had any measureable rain (18.2%).
- We lived in Pleasanton for 1,070 days. During that time, there were only 145 days of measurable rain (13.6%) and only 57.3 inches of rain during that time (less than 1/2 inch per day that it rained).
- Over 60 years, there’s an average of 66 days of rain per year.
- During our time living there, we saw an average of 50 days of rain per year.
Finally, a special thanks to Data Schooler Nisa Mara for her feedback during the process.