1921 Napa Valley Vintage

Cool and normal season, compared with 1991 to 2020. Prohibition years. Few wines were made for sale. Nearest notable vintage: 1920.

Weather and season

Apr to Oct average temperature	62.9°F
Estimated growing degree days	2770
Frost days, Mar to Apr	2
Days 90°F and up, Aug to Oct	11
Winter rain	18.5 in
Spring rain	3.4 in
Harvest rain	0.7 in

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