Average Weather in Summerland California, United States
In Summerland, the summers are warm, arid, and clear and the winters are cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 43°F to 79°F and is rarely below 36°F or above 85°F.
Based on the tourism score, the best time of year to visit Summerland for warm-weather activities is from mid June to late September.
The warm season lasts for 3.5 months, from June 23 to October 7, with an average daily high temperature above 76°F. The hottest day of the year is August 25, with an average high of 79°F and low of 60°F.
The cool season lasts for 3.7 months, from November 29 to March 20, with an average daily high temperature below 67°F. The coldest day of the year is December 25, with an average low of 43°F and high of 64°F.
Average High and Low Temperature
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
In Summerland, 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 in Summerland begins around April 26 and lasts for 6.2 months, ending around November 3. On August 9, 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 3 and lasts for 5.8 months, ending around April 26. On February 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 45% of the time, and clear, mostly clear, or partly cloudy 55% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Summerland varies throughout the year.
The wetter season lasts 4.2 months, from November 21 to March 29, with a greater than 11% chance of a given day being a wet day. The chance of a wet day peaks at 22% on February 20.
The drier season lasts 7.8 months, from March 29 to November 21. The smallest chance of a wet day is 0% on July 28.
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 22% on February 20.
Daily Chance of Precipitation
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. Summerland experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 6.6 months, from October 12 to April 30, 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 3.6 inches.
The rainless period of the year lasts for 5.5 months, from April 30 to October 12. The least rain falls around July 6, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Summerland varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 51 minutes of daylight; the longest day is June 21, with 14 hours, 28 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:45 AM on June 12, and the latest sunrise is 1 hour, 35 minutes later at 7:20 AM on November 3. The earliest sunset is at 4:47 PM on December 4, and the latest sunset is 3 hours, 27 minutes later at 8:14 PM on June 29.
Daylight saving time (DST) is observed in Summerland during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Summerland, 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
The average hourly wind speed in Summerland experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.5 months, from November 3 to June 19, with average wind speeds of more than 6.6 miles per hour. The windiest day of the year is April 26, with an average hourly wind speed of 7.9 miles per hour.
The calmer time of year lasts for 4.5 months, from June 19 to November 3. The calmest day of the year is August 6, with an average hourly wind speed of 5.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Summerland varies throughout the year.
The wind is most often from the west for 1.9 months, from June 22 to August 20, with a peak percentage of 45% on July 24. The wind is most often from the north for 10 months, from August 20 to June 22, with a peak percentage of 43% on January 1.
Summerland 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 3.7 months, from July 9 to October 31, with an average temperature above 63°F. The day of the year with the warmest water is September 10, with an average temperature of 64°F.
The time of year with cooler water lasts for 4.8 months, from December 28 to May 22, with an average temperature below 58°F. The day of the year with the coolest water is April 13, with an average temperature of 56°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Summerland 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 Summerland for general outdoor tourist activities is from mid June to late September, with a peak score in the last week of July.
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 Summerland for hot-weather activities is from early July to mid September, with a peak score in the first week of August.
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.
While it does not do so every year, freezing temperatures are seen in Summerland over some winters. The day least likely to be in the growing season is January 5, with a 78% chance.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Summerland should appear around January 18, only rarely appearing before January 14 or after January 27.
Growing Degree Days
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 3.9 months, from April 27 to August 22, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest day of the year is June 22, with an average of 8.6 kWh.
The darker period of the year lasts for 3.2 months, from November 6 to February 13, with an average daily incident shortwave energy per square meter below 4.0 kWh. The darkest day of the year is December 26, with an average of 2.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Summerland are 34.421 deg latitude, -119.597 deg longitude, and 85 ft elevation.
The topography within 2 miles of Summerland contains very significant variations in elevation, with a maximum elevation change of 876 feet and an average elevation above sea level of 169 feet. Within 10 miles contains very significant variations in elevation (5,085 feet). Within 50 miles also contains extreme variations in elevation (8,819 feet).
The area within 2 miles of Summerland is covered by cropland (50%) and water (35%), within 10 miles by water (40%) and shrubs (36%), and within 50 miles by water (39%) and shrubs (32%).
This report illustrates the typical weather in Summerland, 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
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Summerland.
For each station, the records are corrected for the elevation difference between that station and Summerland according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Summerland is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Summerland and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .