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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

Average High and Low Temperature in the Winter in Mammoth LakesDecJanFeb0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°FFallSpringDec 2936°FDec 2936°F11°F11°FDec 142°FDec 142°F15°F15°FFeb 2841°FFeb 2841°F17°F17°FFeb 137°FFeb 137°F14°F14°FNowNow
The daily average high (red line) and low (blue line) temperature, 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 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

Average Hourly Temperature in the Winter in Mammoth LakesDecJanFeb12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMFallSpringNowNowfrigidfreezingfreezingvery coldcoldcold
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
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

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).

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© Esri, et al.

Compare Mammoth Lakes to another city:

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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

Cloud Cover Categories in the Winter in Mammoth LakesDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringAug 888%Aug 888%Dec 158%Dec 158%Feb 2852%Feb 2852%Jan 154%Jan 154%Feb 155%Feb 155%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

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

Probability of Precipitation in the Winter in Mammoth LakesDecJanFeb0%0%5%5%10%10%15%15%20%20%25%25%30%30%FallSpringFeb 2230%Feb 2230%Dec 120%Dec 120%Jan 125%Jan 125%Feb 125%Feb 125%NowNowsnowmixedrain
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 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

Average Monthly Rainfall in the Winter in Mammoth LakesDecJanFeb0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 in30 in30 inFallSpringJan 170.5 inJan 170.5 inDec 10.7 inDec 10.7 inFeb 280.8 inFeb 280.8 inJan 10.6 inJan 10.6 inFeb 10.5 inFeb 10.5 in
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 snowfall.

Snowfall

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

Average Monthly Snowfall in the Winter in Mammoth LakesDecJanFeb0 in0 in10 in10 in20 in20 in30 in30 in40 in40 in50 in50 in60 in60 in70 in70 in80 in80 inFallSpringJan 430.5 inJan 430.5 inDec 117.6 inDec 117.6 inFeb 2825.7 inFeb 2825.7 inFeb 127.1 inFeb 127.1 inNowNow
The average snowfall (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 rainfall.

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

Hours of Daylight and Twilight in the Winter in Mammoth LakesDecJanFeb0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringDec 219 hr, 34 minDec 219 hr, 34 minnightnightdaydayFeb 2811 hr, 20 minFeb 2811 hr, 20 minFeb 110 hr, 20 minFeb 110 hr, 20 minNowNow
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 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

Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in Mammoth LakesDecJanFeb12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring6:28 AM6:28 AMFeb 285:48 PMFeb 285:48 PM6:57 AM6:57 AMDec 64:37 PMDec 64:37 PM7:11 AM7:11 AMJan 64:52 PMJan 64:52 PM6:59 AM6:59 AMFeb 15:19 PMFeb 15:19 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the winter. 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 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

Moon Rise, Set & Phases in the Winter in Mammoth LakesDecJanFeb12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringNov 42:15 PMNov 42:15 PMNov 1912:58 AMNov 1912:58 AMDec 311:44 PMDec 311:44 PMDec 188:36 PMDec 188:36 PMJan 210:34 AMJan 210:34 AMJan 173:49 PMJan 173:49 PMJan 319:47 PMJan 319:47 PMFeb 168:57 AMFeb 168:57 AMMar 29:35 AMMar 29:35 AMMar 1812:18 AMMar 1812:18 AMMar 3111:25 PMMar 3111:25 PM7:04 AM7:04 AM4:29 PM4:29 PM6:08 AM6:08 AM4:13 PM4:13 PM4:17 PM4:17 PM7:44 AM7:44 AM7:22 AM7:22 AM4:49 PM4:49 PM4:48 PM4:48 PM7:59 AM7:59 AM4:48 PM4:48 PM4:41 PM4:41 PM7:08 AM7:08 AM6:48 AM6:48 AM6:02 PM6:02 PM6:41 PM6:41 PM7:33 AM7:33 AM6:58 PM6:58 PMNowNow
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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

Humidity Comfort Levels in the Winter in Mammoth LakesDecJanFeb0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringJan 150%Jan 150%Dec 10%Dec 10%Feb 280%Feb 280%Jan 10%Jan 10%Feb 10%Feb 10%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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

Average Wind Speed in the Winter in Mammoth LakesDecJanFeb0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphFallSpringDec 16.6 mphDec 16.6 mphFeb 286.9 mphFeb 286.9 mphJan 16.3 mphJan 16.3 mphFeb 16.3 mphFeb 16.3 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

Wind Direction in the Winter in Mammoth LakesDecJanFeb0%100%20%80%40%60%60%40%80%20%100%0%FallSpringNowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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

Time Spent in Various Temperature Bands and the Growing Season in the Winter in Mammoth LakesDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring0%Jan 150%Jan 15NowNowfrigidfreezingvery coldcoldcool
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
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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

Growing Degree Days in the Winter in Mammoth LakesDecJanFeb0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°F1,400°F1,400°F1,600°F1,600°FFallSpringDec 11,367°FDec 11,367°FFeb 272°FFeb 272°FJan 10°FJan 10°FNowNow
The average growing degree days accumulated over the course of the winter, with 25th to 75th and 10th to 90th percentile bands.

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

Average Daily Incident Shortwave Solar Energy in the Winter in Mammoth LakesDecJanFeb0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhFallSpringDec 232.7 kWhDec 232.7 kWhDec 13.0 kWhDec 13.0 kWhFeb 284.7 kWhFeb 284.7 kWhFeb 13.6 kWhFeb 13.6 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

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.

Other 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.

Disclaimer

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.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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