Cloud cover is most prevalent in the colder months specifically January and December at 39%.

Based on weather reports collected during 19852015. See more current weather Annual Weather Averages Near Napa Averages are for Napa County Airport, which is 6 miles from Napa. In terms of wind speed, the annual patterns indicate wind reaching 7.9mph in April and gusts clocking 12.5mph in March. (Weather station: Napa County Airport, USA). Daylight hours range from 9 hours in December and January to 15.4 hours in June, while sunshine hours oscillate from 5.8 hours in January and December to a whopping 12 hours in July. Snowfall graces the city between December and February, with as much as 3.23' in January complemented by 6.1 snowfall days. Rainfall levels vary from a maximum of 1.46' in March to a mere 0.12' in July and August, with the number of rainfall days peaking in March at 14.3 days and dropping to 3.1 days in August. Weather Today Weather Hourly 14 Day Forecast Yesterday/Past Weather Climate (Averages) Currently: 73 ☏.

Humidity fluctuates considerably, topping at 78% in January, falling to a low of 29% between July and August. This implies semi-arid conditions typical of the Geographical location, with significant variations in temperature and precipitation throughout the year.Įxamining the climatological parameters, temperature swings are evident, reaching a peak high of 91☏ in July and a minimum of 25.7☏ in December.

Nampa, Idaho is characterized by a BSk climate according to the Köppen climate classification, commonly referred to as a mid-latitude steppe.

Napa weather by month