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Average Weather at Catalina Airport California, United States

At Catalina Airport, the temperature typically varies from 52°F to 81°F over the course of the year, and is rarely below 45°F or above 91°F.

The warm season lasts for 2.8 months, from July 7 to September 30, with an average daily high temperature above 77°F. The hottest day of the year is August 24, with an average high of 81°F and low of 67°F.

The cool season lasts for 4.7 months, from November 26 to April 17, with an average daily high temperature below 67°F. The coldest day of the year is March 18, with an average low of 52°F and high of 65°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccoldcoldcoolcoolcomfortablecomfortablewarmwarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day at Catalina Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 56 minutes of daylight; the longest day is June 21, with 14 hours, 22 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:43 AM on June 12, and the latest sunrise is 1 hour, 32 minutes later at 7:15 AM on November 4. The earliest sunset is at 4:45 PM on December 4, and the latest sunset is 3 hours, 22 minutes later at 8:07 PM on June 29.

Daylight saving time (DST) is observed at Catalina Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Clouds

At Catalina 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 Catalina Airport begins around April 25 and lasts for 6.2 months, ending around November 2. On September 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 91% of the time, and overcast or mostly cloudy 9% of the time.

The cloudier part of the year begins around November 2 and lasts for 5.8 months, ending around April 25. On February 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 41% of the time, and clear, mostly clear, or partly cloudy 59% of the time.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 2041%Feb 2041%Sep 79%Sep 79%Apr 2525%Apr 2525%Nov 225%Nov 225%overcastovercastmostly cloudymostly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 4.2 months, from November 22 to March 28, with a greater than 10% chance of a given day being a wet day. The chance of a wet day peaks at 20% on February 19.

The drier season lasts 7.8 months, from March 28 to November 22. The smallest chance of a wet day is 0% on July 2.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 20% on February 19.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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 in the year. Catalina Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.8 months, from October 27 to April 21, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 18, with an average total accumulation of 2.9 inches.

The rainless period of the year lasts for 6.2 months, from April 21 to October 27. The least rain falls around August 15, with and average total accumulation of 0.0 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Humidity

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 Catalina 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, staying within 1% of 1% throughout.

Humidity Comfort Levels

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 260%Feb 260%Aug 283%Aug 283%comfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Catalina Airport experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from November 13 to June 1, with average wind speeds of more than 4.4 miles per hour. The windiest day of the year is April 11, with an average hourly wind speed of 5.3 miles per hour.

The calmer time of year lasts for 5.4 months, from June 1 to November 13. The calmest day of the year is August 5, with an average hourly wind speed of 3.6 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Catalina Airport is from the west throughout the year.

Wind Direction

0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Catalina 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 3.1 months, from July 10 to October 12, with an average temperature above 67°F. The day of the year with the warmest water is August 22, with an average temperature of 69°F.

The time of year with cooler water lasts for 4.7 months, from December 10 to April 30, with an average temperature below 61°F. The day of the year with the coolest water is February 10, with an average temperature of 59°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 very significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.0 months, from April 23 to August 24, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest day of the year is June 28, with an average of 8.3 kWh.

The darker period of the year lasts for 3.2 months, from November 5 to February 11, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is December 26, with an average of 3.0 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Catalina Airport are 33.404 deg latitude, -118.416 deg longitude, and 666 ft elevation (map ).

The topography within 2 miles of Catalina Airport contains large variations in elevation, with a maximum elevation change of 2,008 feet, and an average elevation above sea level of 938 feet. Within 10 miles also contains large variations in elevation (2,067 feet). Within 50 miles also contains large variations in elevation (2,802 feet).

The area within 2 miles of Catalina Airport is covered by shrubs (65%) and water (18%), within 10 miles by water (76%) and shrubs (14%), and within 50 miles by water (81%) and artificial surfaces (14%).

Data Sources

This report illustrates the typical weather at Catalina Airport, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Catalina Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to San Clemente Island, San Clemente Island NALF, Long Beach, Long Beach Airport, Jack Northrop Field/Hawthorne Municipal Airport, McDonnell Douglas Space Systems Heliport, Los Angeles International Airport, Santa Monica Municipal Airport, and John Wayne Airport-Orange County.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .