Updated chart: the hottest states continue to suffer the biggest increases in coronavirus cases. This shows the change in new daily cases over roughly the first three weeks of June. Cooling degree days are explained here. weather.gov/key/climate_heat…

Here's the same chart but showing *percentage change* in new COVID changes since the start of June. The pattern is the same except that several cool rural states have seen big percentage increases from low initial rates.

I wonder to what extent breaking California into regions would impact this analysis (he says as he drives from 70° SF, with very few cases, to the 105° and apparently mostly maskless Central Valley).

The LA Times has a bunch of useful per-county breakdowns of California data at latimes.com/projects/califor… , though not one exactly matching the chart above. (I'm most interested in the cases/100k population for the last 14 days.)

Though cases/100k for last 14 days has pretty wide variation within the Bay Area: 349 Marin 103 Solano 77 Alameda 68 Napa 66 Contra Costa 66 San Mateo 55 Sonoma 53 San Francisco 43 Santa Clara