![]() ![]() The National Weather Service is a good resource for local weather data and forcasts. Steve Paulson says today will be rainy and cloudy, with sun later in the afternoon. The average daily maximum temperature is lower in the south, because coastal fog keeps the lower valley cooler. The Napa Valley Regional Rainfall and Stream Monitoring System (Napa Onerain) provides current and historical rainfall, river and stream level monitoring data from a network of automated gage sites throughout Napa County. Use the "Water Resources" link in the map legend to view the data. ![]() The WICC offers a rainfall map that represents lines of equal rainfall (isohyets) based on long-term mean annual precipitation data, collected over a sixty year period (1900-1960). They start off in the lower 50s and warm up to the. It is often a bit cooler toward the end of October with highs in the lower 70s. You will find it is a bit warmer toward the beginning of the month with temperatures in the upper 70s. (Weather station: Napa County Airport, USA). The Napa weather in October offers daily temperatures in the mid to upper 70s. Average annual precipitation is 38 inches at Calistoga and 25 inches at the Napa State Hospital (1961-1990, Western Regional Climate Center 2002). Weather Today Weather Hourly 14 Day Forecast Yesterday/Past Weather Climate (Averages) Currently: 34 F. The average annual precipitation is 35–40 inches in the western side of the County, and 20–25 inches to the east (1961-1990, Western Regional Climate Center 2002). Based on weather reports collected during 19852015. Rainfall gages throughout the County show north-south and east-west trends of precipitation patterns. Averages are for Napa County Airport, which is 6 miles from Napa. The highest rainfall occurs on the western side of the watershed. The majority of annual precipitation occurs as rain that falls during the winter and early spring. ![]() The Napa County has a Mediterranean weather pattern characterized by warm, dry summers and cold, moist winters. Napa County Groundwater Sustainability Agency (GSA). ![]()
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