1917 Napa Valley Vintage
Cool season, compared with 1991 to 2020. Early valley history. Weather records are sparse, so no individual vintage notes survive. Nearest notable vintage: 1920.
Weather and season
| Apr to Oct average temperature | 63°F |
|---|---|
| Estimated growing degree days | 2770 |
| Frost days, Mar to Apr | 21 |
| Days 90°F and up, Aug to Oct | 16 |
| Winter rain | n/a in |
| Spring rain | 2.7 in |
| Harvest rain | 0.1 in |
Station: south valley. Growing degree days are estimated from monthly means.
Explore 1917 on the interactive timeline