Climate and Average Weather Year Round at Livermore Municipal Airport California, United States

At Livermore Municipal Airport, the summers are hot, arid, and clear and the winters are cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 39°F to 88°F and is rarely below 31°F or above 98°F.

Based on the tourism score, the best time of year to visit Livermore Municipal Airport for warm-weather activities is from mid June to late September.

The hot season lasts for 3.7 months, from June 12 to October 2, with an average daily high temperature above 81°F. The hottest month of the year at Livermore Municipal Airport is July, with an average high of 87°F and low of 57°F.

The cool season lasts for 3.0 months, from November 24 to February 24, with an average daily high temperature below 63°F. The coldest month of the year at Livermore Municipal Airport is January, with an average low of 40°F and high of 58°F.

At Livermore Municipal Airport, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Livermore Municipal Airport begins around May 16 and lasts for 5.3 months, ending around October 25.

The clearest month of the year at Livermore Municipal Airport is July, during which on average the sky is clear, mostly clear, or partly cloudy 91% of the time.

The cloudier part of the year begins around October 25 and lasts for 6.7 months, ending around May 16.

The cloudiest month of the year at Livermore Municipal Airport is January, during which on average the sky is overcast or mostly cloudy 55% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Livermore Municipal Airport varies throughout the year.

The wetter season lasts 5.2 months, from November 3 to April 10, with a greater than 15% chance of a given day being a wet day. The month with the most wet days at Livermore Municipal Airport is February, with an average of 8.1 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from April 10 to November 3. The month with the fewest wet days at Livermore Municipal Airport is July, with an average of 0.1 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 Livermore Municipal Airport is February, with an average of 8.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 29% on February 20.

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. Livermore Municipal Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.3 months, from October 3 to May 12, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Livermore Municipal Airport is February, with an average rainfall of 3.5 inches.

The rainless period of the year lasts for 4.7 months, from May 12 to October 3. The month with the least rain at Livermore Municipal Airport is July, with an average rainfall of 0.0 inches.

The length of the day at Livermore Municipal Airport varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 33 minutes of daylight; the longest day is June 20, with 14 hours, 46 minutes of daylight.

The earliest sunrise is at 5:45 AM on June 13, and the latest sunrise is 1 hour, 49 minutes later at 7:34 AM on November 2. The earliest sunset is at 4:48 PM on December 6, and the latest sunset is 3 hours, 45 minutes later at 8:33 PM on June 28.

Daylight saving time (DST) is observed at Livermore Municipal Airport during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

The figure below presents a compact representation of key lunar data for 2024. 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 Livermore Municipal Airport, 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 Livermore Municipal Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.9 months, from April 13 to September 8, with average wind speeds of more than 8.0 miles per hour. The windiest month of the year at Livermore Municipal Airport is June, with an average hourly wind speed of 9.6 miles per hour.

The calmer time of year lasts for 7.1 months, from September 8 to April 13. The calmest month of the year at Livermore Municipal Airport is January, with an average hourly wind speed of 6.3 miles per hour.

The predominant average hourly wind direction at Livermore Municipal Airport varies throughout the year.

The wind is most often from the west for 9.4 months, from February 7 to November 19, with a peak percentage of 92% on July 31. The wind is most often from the north for 2.6 months, from November 19 to February 7, with a peak percentage of 35% on January 1.

Livermore Municipal Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.5 months, from August 1 to October 16, with an average temperature above 57°F. The month of the year at Livermore Municipal Airport with the warmest water is September, with an average temperature of 58°F.

The time of year with cooler water lasts for 5.9 months, from December 14 to June 11, with an average temperature below 54°F. The month of the year at Livermore Municipal Airport with the coolest water is January, with an average temperature of 53°F.

To characterize how pleasant the weather is at Livermore Municipal Airport 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 Livermore Municipal Airport for general outdoor tourist activities is from mid June to late September, with a peak score in the third 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 Livermore Municipal Airport for hot-weather activities is from late June to late August, with a peak score in the third week of July.

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 Livermore Municipal Airport typically lasts for 10 months (316 days), from around January 27 to around December 8, rarely starting after February 29, or ending before November 16.

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 Livermore Municipal Airport should appear around February 9, only rarely appearing before January 27 or after February 25.

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 3.5 months, from May 6 to August 24, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year at Livermore Municipal Airport is June, with an average of 8.3 kWh.

The darker period of the year lasts for 3.5 months, from November 3 to February 18, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest month of the year at Livermore Municipal Airport is December, with an average of 2.3 kWh.

For the purposes of this report, the geographical coordinates of Livermore Municipal Airport are 37.693 deg latitude, -121.821 deg longitude, and 381 ft elevation.

The topography within 2 miles of Livermore Municipal Airport contains significant variations in elevation, with a maximum elevation change of 574 feet and an average elevation above sea level of 429 feet. Within 10 miles contains significant variations in elevation (2,444 feet). Within 50 miles contains large variations in elevation (4,324 feet).

The area within 2 miles of Livermore Municipal Airport is covered by artificial surfaces (49%), grassland (22%), and cropland (17%), within 10 miles by grassland (66%) and artificial surfaces (17%), and within 50 miles by cropland (25%) and grassland (21%).