Winter Weather in Mammoth Lakes California, United States
Daily high temperatures are around 39°F, rarely falling below 25°F or exceeding 52°F. The lowest daily average high temperature is 36°F on December 29.
Daily low temperatures are around 14°F, rarely falling below -0°F or exceeding 25°F. The lowest daily average low temperature is 11°F on December 30.
For reference, on July 27, the hottest day of the year, temperatures in Mammoth Lakes typically range from 41°F to 76°F, while on December 30, the coldest day of the year, they range from 11°F to 36°F.
Average High and Low Temperature in the Winter in Mammoth Lakes
The figure below shows you a compact characterization of the hourly average winter temperatures. The horizontal axis is the day, 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 the Winter in Mammoth Lakes
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Gračanica, Bosnia & Herzegovina (6,217 miles away); Chepelare, Bulgaria (6,500 miles); and Dêqên, China (7,395 miles) are the far-away foreign places with temperatures most similar to Mammoth Lakes (view comparison).
The winter in Mammoth Lakes experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 41% to 48%. The highest chance of overcast or mostly cloudy conditions is 48% on February 22.
The clearest day of the winter is December 8, with clear, mostly clear, or partly cloudy conditions 58% of the time.
For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on August 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 88%.
Cloud Cover Categories in the Winter in Mammoth Lakes
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Mammoth Lakes, the chance of a wet day over the course of the winter is very rapidly increasing, starting the season at 20% and ending it at 29%.
For reference, the year's highest daily chance of a wet day is 30% on February 21, and its lowest chance is 3% on July 2.
Over the course of the winter in Mammoth Lakes, the chance of a day with only rain remains an essentially constant 1% throughout, the chance of a day with mixed snow and rain remains an essentially constant 10% throughout, and the chance of a day with only snow increases from 8% to 15%.
Probability of Precipitation in the Winter in Mammoth Lakes
To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during the winter in Mammoth Lakes is essentially constant, remaining about 0.7 inches throughout, and rarely exceeding 2.5 inches.
The lowest average 31-day accumulation is 0.5 inches on January 18.
Average Monthly Rainfall in the Winter in Mammoth Lakes
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day snowfall during the winter in Mammoth Lakes is very rapidly increasing, starting the season at 17.6 inches, when it rarely exceeds 39.0 inches or falls below 1.3 inches, and ending the season at 25.7 inches, when it rarely exceeds 52.0 inches or falls below 4.2 inches.
The highest average 31-day accumulation is 30.5 inches on January 5.
Average Monthly Snowfall in the Winter in Mammoth Lakes
Over the course of the winter in Mammoth Lakes, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 35 minutes, implying an average daily increase of 1 minute, 4 seconds, and weekly increase of 7 minutes, 30 seconds.
The shortest day of the winter is December 21, with 9 hours, 34 minutes of daylight and the longest day is February 28, with 11 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in the Winter in Mammoth Lakes
The latest sunrise of the winter in Mammoth Lakes is 7:11 AM on January 6 and the earliest sunrise is 43 minutes earlier at 6:28 AM on February 28.
The earliest sunset is 4:37 PM on December 6 and the latest sunset is 1 hour, 12 minutes later at 5:48 PM on February 28.
Daylight saving time is observed in Mammoth Lakes during 2021, but it neither starts nor ends during the winter, so the entire season is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:34 AM and sets 14 hours, 46 minutes later, at 8:20 PM, while on December 21, the shortest day of the year, it rises at 7:07 AM and sets 9 hours, 34 minutes later, at 4:41 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in Mammoth Lakes
The figure below presents a compact representation of key lunar data for the winter of 2021. 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in the Winter in Mammoth Lakes
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 chance that a given day will be muggy in Mammoth Lakes is essentially constant during the winter, remaining around 0% throughout.
For reference, on July 6, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in the Winter in Mammoth Lakes
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 in Mammoth Lakes is essentially constant during the winter, remaining within 0.4 miles per hour of 6.5 miles per hour throughout.
For reference, on April 10, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 5.2 miles per hour.
Average Wind Speed in the Winter in Mammoth Lakes
The hourly average wind direction in Mammoth Lakes throughout the winter is predominantly from the west, with a peak proportion of 38% on February 28.
Wind Direction in the Winter in Mammoth Lakes
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 in Mammoth Lakes typically lasts for 2.1 months (63 days), from around June 25 to around August 27, rarely starting before June 4, or ending after September 19.
The winter in Mammoth Lakes is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in the Winter in Mammoth Lakes
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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.
The average accumulated growing degree days in Mammoth Lakes are very rapidly decreasing during the winter, decreasing by 1,365°F, from 1,367°F to 2°F, over the course of the season.
Growing Degree Days in the Winter in Mammoth Lakes
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 in Mammoth Lakes is rapidly increasing during the winter, rising by 1.7 kWh, from 3.0 kWh to 4.7 kWh, over the course of the season.
The lowest average daily incident shortwave solar energy during the winter is 2.7 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in the Winter in Mammoth Lakes
For the purposes of this report, the geographical coordinates of Mammoth Lakes are 37.649 deg latitude, -118.972 deg longitude, and 7,874 ft elevation.
The topography within 2 miles of Mammoth Lakes contains very significant variations in elevation, with a maximum elevation change of 1,749 feet and an average elevation above sea level of 8,099 feet. Within 10 miles contains very significant variations in elevation (6,614 feet). Within 50 miles also contains extreme variations in elevation (13,547 feet).
The area within 2 miles of Mammoth Lakes is covered by trees (61%) and shrubs (39%), within 10 miles by shrubs (50%) and trees (39%), and within 50 miles by shrubs (59%) and trees (28%).
This report illustrates the typical weather in Mammoth Lakes, 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 Lakes.
For each station, the records are corrected for the elevation difference between that station and Mammoth Lakes 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 Lakes is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mammoth Lakes and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Mammoth Lakes and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
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