Average Weather in Mammoth Arizona, United States
In Mammoth, the summers are sweltering and dry, the winters are cold, and it is mostly clear year round. Over the course of the year, the temperature typically varies from 39°F to 100°F and is rarely below 31°F or above 106°F.
Based on the beach/pool score, the best time of year to visit Mammoth for hot-weather activities is from early June to mid September.
The hot season lasts for 3.8 months, from May 24 to September 18, with an average daily high temperature above 93°F. The hottest day of the year is June 28, with an average high of 100°F and low of 74°F.
The cool season lasts for 3.1 months, from November 22 to February 26, with an average daily high temperature below 69°F. The coldest day of the year is January 4, with an average low of 39°F and high of 62°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 Mammoth, 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 Mammoth begins around March 18 and lasts for 3.7 months, ending around July 7. On June 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 84% of the time, and overcast or mostly cloudy 16% of the time.
The cloudier part of the year begins around July 7 and lasts for 8.3 months, ending around March 18. On July 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 44% of the time, and clear, mostly clear, or partly cloudy 56% 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 Mammoth varies significantly throughout the year.
The wetter season lasts 2.1 months, from July 6 to September 10, with a greater than 19% chance of a given day being a wet day. The chance of a wet day peaks at 36% on August 4.
The drier season lasts 9.9 months, from September 10 to July 6. The smallest chance of a wet day is 2% on June 9.
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 36% on August 4.
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. Mammoth experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 9.4 months, from June 25 to April 6, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 6, with an average total accumulation of 1.7 inches.
The rainless period of the year lasts for 2.6 months, from April 6 to June 25. The least rain falls around June 1, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The length of the day in Mammoth varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 60 minutes of daylight; the longest day is June 21, with 14 hours, 19 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:14 AM on June 11, and the latest sunrise is 2 hours, 12 minutes later at 7:25 AM on January 8. The earliest sunset is at 5:16 PM on December 4, and the latest sunset is 2 hours, 18 minutes later at 7:34 PM on June 29.
Daylight saving time (DST) is not observed in Mammoth during 2018.
Sunrise & Sunset with Twilight
Mammoth experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 2.5 months, from July 1 to September 17, during which time the comfort level is muggy, oppressive, or miserable at least 4% of the time. The muggiest day of the year is August 5, with muggy conditions 16% of the time.
The least muggy day of the year is November 29, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Mammoth experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 9.4 months, from September 22 to July 3, with average wind speeds of more than 7.0 miles per hour. The windiest day of the year is April 21, with an average hourly wind speed of 8.5 miles per hour.
The calmer time of year lasts for 2.6 months, from July 3 to September 22. The calmest day of the year is August 12, with an average hourly wind speed of 5.6 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Mammoth varies throughout the year.
The wind is most often from the west for 7.0 months, from February 19 to September 20, with a peak percentage of 63% on June 8. The wind is most often from the east for 5.0 months, from September 20 to February 19, with a peak percentage of 52% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Mammoth 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 Mammoth for general outdoor tourist activities are from late April to late June and from early September to mid October, with a peak score in the last week of September.
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 Mammoth for hot-weather activities is from early June to mid September, with a peak score in the last 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.
The growing season in Mammoth typically lasts for 10 months (303 days), from around February 5 to around December 5, rarely starting after March 8, or ending before November 17.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Mammoth should appear around January 24, only rarely appearing before January 17 or after February 2.
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 2.7 months, from April 18 to July 7, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest day of the year is June 8, with an average of 8.6 kWh.
The darker period of the year lasts for 3.1 months, from November 6 to February 9, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest day of the year is December 24, with an average of 3.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Mammoth are 32.723 deg latitude, -110.641 deg longitude, and 2,615 ft elevation.
The topography within 2 miles of Mammoth contains significant variations in elevation, with a maximum elevation change of 689 feet and an average elevation above sea level of 2,528 feet. Within 10 miles contains significant variations in elevation (4,006 feet). Within 50 miles also contains extreme variations in elevation (9,229 feet).
The area within 2 miles of Mammoth is covered by shrubs (96%), within 10 miles by shrubs (95%), and within 50 miles by shrubs (89%).
This report illustrates the typical weather in Mammoth, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Mammoth.
For each station, the records are corrected for the elevation difference between that station and Mammoth 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 Mammoth is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mammoth and a given station.
The stations contributing to this reconstruction are: Allied Airstrip (42%, 66 kilometers, south); Safford Municipal Airport (23%, 95 kilometers, east); Casa Grande Municipal Airport (18%, 108 kilometers, west); and Phoenix-Mesa Gateway Airport (17%, 115 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .