The bar chart below shows the average monthly peak daytime temperatures at Napa
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
°C | 12.6 | 15.6 | 16.9 | 19.4 | 22.6 | 25.9 | 27.7 | 27.5 | 26.4 | 23.3 | 16.8 | 12.7 |
°F | 54.7 | 60.1 | 62.5 | 67 | 72.6 | 78.6 | 81.8 | 81.5 | 79.6 | 74 | 62.3 | 54.8 |
Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.
The graph below shows the average rainfall and number of rainy days per month.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
mm | 157 | 115 | 97 | 47 | 14 | 5 | 1 | 3 | 10 | 41 | 100 | 127 |
inches | 6.2 | 4.5 | 3.8 | 1.8 | 0.5 | 0.2 | 0.1 | 0.1 | 0.4 | 1.6 | 3.9 | 5 |
Rainy days | 10 | 9 | 10 | 6 | 3 | 1 | 1 | 1 | 2 | 4 | 9 | 10 |
Average annual rainfall in Napa: 633.2mm (249.3 inches)
The bar chart below shows the average daily sunshine hours in Napa
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Hrs sunshine | 6.1 | 7.9 | 9.4 | 11.3 | 12.2 | 12.5 | 12.5 | 11.5 | 10.7 | 9.2 | 6.6 | 5.5 |
The graph below shows the daily range of temperatures for each month.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Min °C | 3 | 4.8 | 5.4 | 6.3 | 8.5 | 11 | 12 | 12.1 | 11.2 | 8.9 | 5.7 | 3.3 |
Max °C | 12.9 | 15.9 | 17.2 | 19.8 | 22.9 | 26.3 | 28.1 | 27.9 | 26.8 | 23.7 | 17.1 | 12.9 |
Min °F | 37.3 | 40.6 | 41.7 | 43.3 | 47.3 | 51.7 | 53.5 | 53.8 | 52.2 | 48 | 42.3 | 37.9 |
Max °F | 46.2 | 50.5 | 52.3 | 55.4 | 60.3 | 65.5 | 68 | 68 | 66.2 | 61.3 | 52.5 | 46.6 |
The graph below shows the average sea temperature.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
°C | 12.1 | 12 | 11.9 | 11.7 | 11.8 | 12.2 | 13.1 | 14 | 14.4 | 14 | 13.4 | 12.6 |
°F | 53.8 | 53.6 | 53.5 | 53.1 | 53.2 | 54 | 55.5 | 57.2 | 57.9 | 57.3 | 56.1 | 54.6 |
The graph below shows the average wind speed.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
km/h | 12 | 14 | 16 | 17 | 19 | 19 | 18 | 17 | 15 | 13 | 12 | 12 |
mph | 7 | 9 | 10 | 11 | 12 | 12 | 11 | 11 | 9 | 8 | 7 | 7 |
A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.
The graph below shows the average relative humidity.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|
81% | 77% | 72% | 68% | 66% | 64% | 63% | 66% | 65% | 68% | 76% | 81% |
Hottest month: | July | 27.7°C 81.9°F |
---|---|---|
Driest month: | July | 1mm 0ins |
Sunniest month: | May | 12.2hrs |
Coldest month: | January | 12.6°C 54.7°F |
Wettest month: | January | 157mm 6.2ins |
Warmest sea: | September | 14.4°C 57.9°F |