Monthly Weather in Napa, United States
What is the average monthly temperature in Napa?
The average monthly temperature in Napa, California, United States ranges from 8.7°C (47.6°F) in February to 20.6°C (69.1°F) in August. Napa temperature by month is given in the table below.
| Month | Celsius | Fahrenheit |
|---|---|---|
| January | 10.2°C | 50.4°F |
| February | 8.7°C | 47.7°F |
| March | 10.0°C | 50.0°F |
| April | 13.2°C | 55.8°F |
| May | 14.8°C | 58.6°F |
| June | 16.8°C | 62.2°F |
| July | 19.4°C | 66.9°F |
| August | 20.6°C | 69.1°F |
| September | 18.3°C | 64.9°F |
| October | 17.0°C | 62.6°F |
| November | 12.6°C | 54.7°F |
| December | 10.6°C | 51.1°F |
What is the hottest month in Napa?
The hottest months in Napa are August, July and September. During August the average temperature outside is 20.6°C (69.1°F), in July it is 19.4°C (66.9°F) and during September the air temperature is around 18.3°C (64.9°F).
What is the coldest month in Napa?
The coldest months in Napa are February, March and January. In February the average air temperature drops to 8.7°C (47.7°F), in March air temperature is 10°C (50°F) and during January it is 10.2°C (50.4°F).
How much does it rain on average in Napa?
On average it rains for 11 month(s) in Napa, United States with an average of 7.6 days of rain per month. In total Napa has 91 rainy days in a year.
When does it rain the most in Napa?
In Napa it rains the most during the following months.
- January - on average 6.93mm (0.27 inches) of rainfall per day.
- March - on average 6.1mm (0.24 inches) of rainfall per day.
- December - on average 3.1mm (0.12 inches) of rainfall per day.
- February - on average 2.78mm (0.11 inches) of rainfall per day.
- November - on average 0.96mm (0.04 inches) of rainfall per day.
- May - on average 0.53mm (0.02 inches) of rainfall per day.
Does it snow in Napa?
No, it doesn't snow in Napa.
When is it windy in Napa?
The windiest months in Napa, United States are March, June and January. In March the average windspeed is 28.8 km/h (17.9 mph), during June the windspeed is 28.1 km/h (17.5 mph) and in January the windspeed is 27.7 km/h (17.2 mph).
What are the least windy months in Napa?
The least windy months in Napa are November, December and October. In November the average windspeed is 18.2 km/h (11.3 mph), during December the windspeed is 18.3 km/h (11.4 mph) and in October the windspeed is 19.7 km/h (12.2 mph).
When is it cloudy in Napa?
The cloudiest months in Napa, United States are March, May and January. On average in March 49.8% of sky is covered by clouds, in May 49.8% is covered by clouds and in January clouds cover about 44% of sky.
When does Napa have the clearest sky?
Napa has the clearest sky in April, October and July. In April 17.2% of sky is covered by clouds, in October clouds cover around 19.8% and during July clouds cover about 22.2% of sky.
What is the average daylight duration in Napa?
The average daylight duration in Napa is 12 hours 11 minutes 22 seconds.
Which months have the most daylight in Napa?
The longest days in Napa are during June, July and May.
- June - 14 hours 47 minutes 13 seconds of daylight.
- July - 14 hours 31 minutes 22 seconds of daylight.
- May - 14 hours 15 minutes 37 seconds of daylight.
Which months have the least daylight in Napa?
The shortest days in Napa are during December, January and November.
- December - 9 hours 32 minutes 54 seconds of daylight.
- January - 9 hours 51 minutes 8 seconds of daylight.
- November - 10 hours 6 minutes 31 seconds of daylight.
What are the humidity levels in Napa throughout the year?
Humidity levels in Napa, United States range from 64.1% in October to 80% in December.
What are the pressure levels in Napa throughout the year?
Pressure levels in Napa change from 1012.4 mb (millibars) in August to 1018.6 mb in December.
What is the visibility in Napa throughout the year?
Visibility in Napa changes from lowest 13.3 km (8.3 miles) in December to highest 15.8 km (9.8 miles) in April.
What are the UV levels in Napa throughout the year?
UV levels change in Napa from 4.1 in December to 9.9 in July.
Which months have the highest UV levels in Napa throughout the year?
In Napa, United States the highest UV index is during July, April and June. During July the average UV index is 9.9, in April UV level is 9.7 and in June UV index is around 9.7.
Which months have the lowest UV levels in Napa throughout the year?
The lowest UV levels in Napa are in December, January and November. In December the average UV index is around 4.1, in January UV index is 4.2 and during November UV level is 5.3.