1931 Napa Valley Vintage

Cool and dry season, compared with 1991 to 2020. Prohibition years. Few wines were made for sale. Nearest notable vintage: 1941.

Weather and season

Apr to Oct average temperature	64.9°F
Estimated growing degree days	3190
Frost days, Mar to Apr	0
Days 90°F and up, Aug to Oct	12
Winter rain	9.6 in
Spring rain	4.1 in
Harvest rain	0.7 in

Station: south valley. Growing degree days are estimated from monthly means.