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Napa Weather, Forecast, Temperature and Precipitation

Napa Weather Related Indexes Graph

2010 Weather Summary Napa, CA California United States
Weather Index 198 196 100
Hail Index 0 2 100
Hurricane Index 0 7 100
Tornado Index 0 28 100
 
Annual Maximum Avg. Temperature 74.0 °F 72.0 °F N/A
Annual Minimum Avg. Temperature 48.0 °F 51.0 °F N/A
Annual Avg. Temperature 60.8 °F 61.5 °F N/A
Annual Heating Degree Days (Tot Degrees < 65) 2,749 2,502 N/A
Annual Cooling Degree Days (Tot Degrees > 65) 1,237 1,229 N/A
Percent of Possible Sunshine 78 74 N/A
Mean Sky Cover (Sunrise to Sunset - Out of 10) 4 5 N/A
Mean Number of Days Clear (Out of 365 Days) 189 167 N/A
Mean Number of Days Rain (Out of 365 Days) 58 55 N/A
Mean Number of Days Snow (Out of 365 Days) 0 0 N/A
Avg. Annual Precipitation (Total Inches) 18.00" 17.00" N/A
Avg. Annual Snowfall (Total Inches) 0.00" 1.00" N/A

The data for Napa, CA may also contain data for the following areas: Napa

Annual Heating Degree Days (HDD): A form of Degree Day used to estimate energy requirements for heating. Typically, heating degree days are calculated as how much colder the mean temperature at a location is than 65°F on a given day. For example, if a location experiences a mean temperature of 55°F on a certain day, there were 10 HDD that day because 65 - 55 = 10, according to the National Weather Service.

Annual Cooling Degree Days (CDD): A form of Degree Day used to estimate energy requirements for air conditioning or refrigeration. Typically, cooling degree days are calculated as how much warmer the mean temperature at a location is than 65°F on a given day. For example, if a location experiences a mean temperature of 75°F on a certain day, there were 10 CDD that day because 75 - 65 = 10, according to the National Weather Service.

Mean Sky Cover: reflects the approximate amount that the sky is covered with clouds, sunrise to sunset on a scale of 0 to 10

Index score: (100 = National Average) for an area is compared to the national average of 100. A score of 200 indicates twice the national average, while 50 indicates half the national average. Note: A higher Weather Index score represents better overall weather (higher number good). A higher Hail, Hurricane or Tornado Index means the chance of that weather event is higher (higher number bad).

Information is deemed reliable but not guaranteed. Demographic Information FAQ

Napa 2010 Avg. Monthly Low Temperatures

2010 Avg. Monthly Low Temperature Napa, CA California United States
Avg. Annual Low Temperature 45.8 °F 49.6 °F N/A
Avg. January Low Temperature 37.4 °F 35.6 °F N/A
Avg. February Low Temperature 40.1 °F 39.5 °F N/A
Avg. March Low Temperature 41.9 °F 43.2 °F N/A
Avg. April Low Temperature 43.9 °F 47.6 °F N/A
Avg. May Low Temperature 47.9 °F 54.0 °F N/A
Avg. June Low Temperature 51.8 °F 60.3 °F N/A
Avg. July Low Temperature 53.7 °F 65.5 °F N/A
Avg. August Low Temperature 53.1 °F 64.0 °F N/A
Avg. September Low Temperature 51.9 °F 59.0 °F N/A
Avg. October Low Temperature 47.6 °F 50.4 °F N/A
Avg. November Low Temperature 41.8 °F 40.5 °F N/A
Avg. December Low Temperature 38.0 °F 35.6 °F N/A

The data for Napa, CA may also contain data for the following areas: Napa

Information is deemed reliable but not guaranteed. Demographic Information FAQ

Napa 2010 Avg. Monthly High Temperatures

2010 Avg. Monthly High Temperature Napa, CA California United States
Avg. Annual High Temperature 71.0 °F 77.6 °F N/A
Avg. January High Temperature 55.4 °F 55.7 °F N/A
Avg. February High Temperature 60.8 °F 62.6 °F N/A
Avg. March High Temperature 64.5 °F 68.3 °F N/A
Avg. April High Temperature 69.2 °F 75.9 °F N/A
Avg. May High Temperature 74.4 °F 84.5 °F N/A
Avg. June High Temperature 80.2 °F 92.3 °F N/A
Avg. July High Temperature 83.7 °F 98.4 °F N/A
Avg. August High Temperature 83.9 °F 97.0 °F N/A
Avg. September High Temperature 82.5 °F 91.4 °F N/A
Avg. October High Temperature 76.1 °F 81.4 °F N/A
Avg. November High Temperature 65.0 °F 66.8 °F N/A
Avg. December High Temperature 56.4 °F 56.6 °F N/A

The data for Napa, CA may also contain data for the following areas: Napa

Information is deemed reliable but not guaranteed. Demographic Information FAQ

Napa 2010 Avg. Monthly Precipitation

2010 Avg. Monthly Precipitation Napa, CA California United States
Avg. Annual Precipitation 26.83" 6.70" N/A
Avg. January Precipitation 5.64" 1.26" N/A
Avg. February Precipitation 5.28" 1.29" N/A
Avg. March Precipitation 4.04" 1.43" N/A
Avg. April Precipitation 1.38" 0.50" N/A
Avg. May Precipitation 0.77" 0.25" N/A
Avg. June Precipitation 0.12" 0.07" N/A
Avg. July Precipitation 0.01" 0.00" N/A
Avg. August Precipitation 0.08" 0.03" N/A
Avg. September Precipitation 0.32" 0.20" N/A
Avg. October Precipitation 1.38" 0.31" N/A
Avg. November Precipitation 3.49" 0.59" N/A
Avg. December Precipitation 4.32" 0.77" N/A

The data for Napa, CA may also contain data for the following areas: Napa

Information is deemed reliable but not guaranteed. Demographic Information FAQ