Climate and Average Weather Year Round at Nevada County Air Park California, United States

At Nevada County Air Park, the summers are arid, mostly clear, and warm and the winters are long, wet, cold, and partly cloudy. Over the course of the year, the temperature typically varies from 40°F to 87°F and is rarely below 31°F or above 95°F.

Based on the beach/pool score, the best time of year to visit Nevada County Air Park for hot-weather activities is from early July to late August.

The hot season lasts for 3.0 months, from June 18 to September 18, with an average daily high temperature above 80°F. The hottest month of the year at Nevada County Air Park is July, with an average high of 86°F and low of 68°F.

The cool season lasts for 4.6 months, from November 13 to April 1, with an average daily high temperature below 60°F. The coldest month of the year at Nevada County Air Park is December, with an average low of 41°F and high of 53°F.

At Nevada County Air Park, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year at Nevada County Air Park begins around May 24 and lasts for 4.9 months, ending around October 22.

The clearest month of the year at Nevada County Air Park is July, during which on average the sky is clear, mostly clear, or partly cloudy 89% of the time.

The cloudier part of the year begins around October 22 and lasts for 7.1 months, ending around May 24.

The cloudiest month of the year at Nevada County Air Park is February, during which on average the sky is overcast or mostly cloudy 60% of the time.

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A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Nevada County Air Park varies significantly throughout the year.

The wetter season lasts 6.0 months, from October 27 to April 26, with a greater than 18% chance of a given day being a wet day. The month with the most wet days at Nevada County Air Park is February, with an average of 9.5 days with at least 0.04 inches of precipitation.

The drier season lasts 6.0 months, from April 26 to October 27. The month with the fewest wet days at Nevada County Air Park is July, with an average of 0.3 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Nevada County Air Park is December, with an average of 9.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 32% on December 7.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Nevada County Air Park experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.8 months, from September 17 to June 11, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Nevada County Air Park is February, with an average rainfall of 5.9 inches.

The rainless period of the year lasts for 3.2 months, from June 11 to September 17. The month with the least rain at Nevada County Air Park is July, with an average rainfall of 0.1 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Nevada County Air Park experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 3.9 weeks, from February 1 to February 28, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Nevada County Air Park is February, with an average snowfall of 1.3 inches.

The snowless period of the year lasts for 11 months, from February 28 to February 1. The least snow falls around July 27, with an average total accumulation of 0.0 inches.

The length of the day at Nevada County Air Park varies significantly over the course of the year. In 2026, the shortest day is December 21, with 9 hours, 24 minutes of daylight; the longest day is June 21, with 14 hours, 56 minutes of daylight.

The earliest sunrise is at 5:37 AM on June 13, and the latest sunrise is 1 hour, 54 minutes later at 7:30 AM on October 31. The earliest sunset is at 4:40 PM on December 7, and the latest sunset is 3 hours, 54 minutes later at 8:34 PM on June 27.

Daylight saving time (DST) is observed at Nevada County Air Park during 2026, starting in the spring on March 8, lasting 7.8 months, and ending in the fall on November 1.

The figure below presents a compact representation of key lunar data for 2026. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level at Nevada County Air Park, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Nevada County Air Park does not vary significantly over the course of the year, remaining within 0.5 miles per hour of 5.6 miles per hour throughout.

The predominant average hourly wind direction at Nevada County Air Park varies throughout the year.

The wind is most often from the south for 7.5 months, from February 5 to September 21, with a peak percentage of 53% on August 12. The wind is most often from the east for 4.4 months, from September 21 to February 5, with a peak percentage of 49% on January 1.

To characterize how pleasant the weather is at Nevada County Air Park throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Nevada County Air Park for general outdoor tourist activities is from late June to mid September, with a peak score in the second week of August.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Nevada County Air Park for hot-weather activities is from early July to late August, with a peak score in the first week of August.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Nevada County Air Park typically lasts for 8.7 months (264 days), from around March 19 to around December 8, rarely starting after April 18, or ending before November 14.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Nevada County Air Park should appear around February 10, only rarely appearing before January 21 or after March 16.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from May 12 to August 24, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year at Nevada County Air Park is July, with an average of 8.3 kWh.

The darker period of the year lasts for 3.6 months, from November 2 to February 19, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest month of the year at Nevada County Air Park is December, with an average of 2.1 kWh.

For the purposes of this report, the geographical coordinates of Nevada County Air Park are 39.223 deg latitude, -121.002 deg longitude, and 3,110 ft elevation.

The topography within 2 miles of Nevada County Air Park contains very significant variations in elevation, with a maximum elevation change of 906 feet and an average elevation above sea level of 2,893 feet. Within 10 miles contains very significant variations in elevation (3,724 feet). Within 50 miles also contains extreme variations in elevation (9,337 feet).

The area within 2 miles of Nevada County Air Park is covered by shrubs (60%) and trees (40%), within 10 miles by shrubs (48%) and trees (47%), and within 50 miles by trees (46%) and shrubs (18%).