Average Weather in Somerton Arizona, United States
In Somerton, the summers are sweltering and arid, the winters are cool and dry, and it is mostly clear year round. Over the course of the year, the temperature typically varies from 48°F to 107°F and is rarely below 41°F or above 112°F.
Based on the beach/pool score, the best times of year to visit Somerton for hot-weather activities are from late May to early July and from early September to early October.
The hot season lasts for 3.7 months, from June 1 to September 23, with an average daily high temperature above 99°F. The hottest day of the year is July 12, with an average high of 107°F and low of 83°F.
The cool season lasts for 3.0 months, from November 21 to February 21, with an average daily high temperature below 76°F. The coldest day of the year is December 27, with an average low of 48°F and high of 68°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 Somerton, 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 Somerton begins around August 12 and lasts for 2.7 months, ending around November 2. On September 18, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 89% of the time, and overcast or mostly cloudy 11% of the time.
The cloudier part of the year begins around November 2 and lasts for 9.3 months, ending around August 12. On February 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 35% of the time, and clear, mostly clear, or partly cloudy 65% of the time.
Cloud Cover Categories
Somerton does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 0% to 8%, with an average value of 4%.
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 8% on August 23.
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. Somerton experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Somerton. The most rain falls during the 31 days centered around December 18, with an average total accumulation of 0.4 inches.
The least rain falls around June 6, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Somerton varies significantly over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 0 minutes of daylight; the longest day is June 20, with 14 hours, 18 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:30 AM on June 11, and the latest sunrise is 2 hours, 11 minutes later at 7:41 AM on January 7. The earliest sunset is at 5:32 PM on December 3, and the latest sunset is 2 hours, 18 minutes later at 7:50 PM on June 29.
Daylight saving time (DST) is not observed in Somerton during 2017.
Sunrise & Sunset with Twilight
Somerton experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.0 months, from June 28 to September 28, during which time the comfort level is muggy, oppressive, or miserable at least 11% of the time. The muggiest day of the year is August 25, with muggy conditions 44% of the time.
The least muggy day of the year is December 14, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Somerton experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.4 months, from November 24 to June 6, with average wind speeds of more than 6.8 miles per hour. The windiest day of the year is April 27, with an average hourly wind speed of 7.5 miles per hour.
The calmer time of year lasts for 5.6 months, from June 6 to November 24. The calmest day of the year is September 21, with an average hourly wind speed of 6.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Somerton varies throughout the year.
The wind is most often from the west for 2.9 months, from March 8 to June 6 and for 1.0 weeks, from September 24 to October 1, with a peak percentage of 48% on May 7. The wind is most often from the south for 3.6 months, from June 6 to September 24, with a peak percentage of 61% on August 4. The wind is most often from the north for 5.2 months, from October 1 to March 8, with a peak percentage of 61% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Somerton 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 times of year to visit Somerton for general outdoor tourist activities are from late March to mid June and from late September to early November, with a peak score in the third week of October.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Somerton for hot-weather activities are from late May to early July and from early September to early October, with a peak score in the second week of June.
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.
Temperatures in Somerton are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season
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 3.2 months, from April 18 to July 23, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest day of the year is June 12, with an average of 8.6 kWh.
The darker period of the year lasts for 3.1 months, from November 5 to February 8, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest day of the year is December 22, with an average of 3.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Somerton are 32.596 deg latitude, -114.710 deg longitude, and 105 ft elevation.
The topography within 2 miles of Somerton is essentially flat, with a maximum elevation change of 43 feet and an average elevation above sea level of 103 feet. Within 10 miles is essentially flat (804 feet). Within 50 miles contains significant variations in elevation (3,845 feet).
The area within 2 miles of Somerton is covered by cropland (90%) and shrubs (10%), within 10 miles by cropland (55%) and shrubs (36%), and within 50 miles by shrubs (70%) and cropland (19%).
This report illustrates the typical weather in Somerton, 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 Somerton.
For each station, the records are corrected for the elevation difference between that station and Somerton 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 Somerton is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Somerton and a given station.
The stations contributing to this reconstruction are: Yuma International Airport (91%, 11 kilometers, northeast) and General Rodolfo Sánchez Taboada International Airport (9%, 50 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .