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Climate and Average Weather Year Round in Mount Shasta California, United States

In Mount Shasta, the summers are warm, dry, and mostly clear and the winters are long, very cold, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from 28°F to 85°F and is rarely below 18°F or above 93°F.

Based on the tourism score, the best time of year to visit Mount Shasta for warm-weather activities is from early July to mid August.

Climate in Mount Shasta

coldcoolwarmwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow89%89%35%35%clearovercastprecipitation: 5.3 inprecipitation: 5.3 in0.1 in0.1 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 6.4tourism score: 6.40.00.0
Mount Shasta weather by month. Click on each chart for more information.

The hot season lasts for 3.0 months, from June 18 to September 17, with an average daily high temperature above 77°F. The hottest month of the year in Mount Shasta is July, with an average high of 84°F and low of 52°F.

The cold season lasts for 3.7 months, from November 12 to March 4, with an average daily high temperature below 50°F. The coldest month of the year in Mount Shasta is December, with an average low of 28°F and high of 43°F.

Average High and Low Temperature in Mount Shasta

Average High and Low Temperature in Mount ShastahotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FDec 3042°FDec 3042°FAug 385°FAug 385°F28°F28°F52°F52°FJun 1877°FJun 1877°FSep 1777°FSep 1777°FNov 1250°FNov 1250°FMar 450°FMar 450°F48°F48°F45°F45°F33°F33°F32°F32°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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 44°F47°F53°F60°F68°F76°F84°F84°F76°F64°F50°F43°F
Temp. 35°F37°F41°F46°F54°F61°F68°F67°F60°F50°F39°F34°F
Low 28°F30°F33°F36°F42°F48°F52°F50°F45°F39°F32°F28°F

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 Mount Shasta

Average Hourly Temperature in Mount ShastaJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfreezingfreezingvery coldvery coldcoldcoolcoolcomfortablewarmfreezingfreezing
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.

Candelario, Spain (5,542 miles away) is the far-away foreign place with temperatures most similar to Mount Shasta (view comparison).

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In Mount Shasta, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Mount Shasta begins around May 31 and lasts for 4.5 months, ending around October 14.

The clearest month of the year in Mount Shasta is August, during which on average the sky is clear, mostly clear, or partly cloudy 86% of the time.

The cloudier part of the year begins around October 14 and lasts for 7.5 months, ending around May 31.

The cloudiest month of the year in Mount Shasta is January, during which on average the sky is overcast or mostly cloudy 64% of the time.

Cloud Cover Categories in Mount Shasta

Cloud Cover Categories in Mount ShastaclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 289%Aug 289%Jan 935%Jan 935%May 3161%May 3161%Oct 1462%Oct 1462%NowNowclearmostly cloudyovercastpartly cloudymostly clear
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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 64%64%60%53%45%28%14%14%21%40%60%64%
Clearer 36%36%40%47%55%72%86%86%79%60%40%36%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Mount Shasta varies significantly throughout the year.

The wetter season lasts 6.5 months, from October 24 to May 7, with a greater than 19% chance of a given day being a wet day. The month with the most wet days in Mount Shasta is February, with an average of 9.9 days with at least 0.04 inches of precipitation.

The drier season lasts 5.5 months, from May 7 to October 24. The month with the fewest wet days in Mount Shasta is August, with an average of 1.0 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Mount Shasta is November, with an average of 7.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 25% on November 27.

Daily Chance of Precipitation in Mount Shasta

Daily Chance of Precipitation in Mount ShastawetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2836%Feb 2836%Aug 73%Aug 73%Oct 2419%Oct 2419%May 719%May 719%NowNowmixedrainsnow
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 5.5d6.3d6.9d6.2d5.7d2.8d1.3d1.0d2.1d4.6d7.1d5.9d
Mixed 3.4d2.9d2.6d0.9d0.1d0.0d0.0d0.0d0.0d0.2d1.6d3.4d
Snow 1.2d0.7d0.3d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.4d1.1d
Any 10.1d9.9d9.8d7.2d5.7d2.8d1.3d1.0d2.1d4.8d9.1d10.4d

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. Mount Shasta experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.4 months, from September 11 to June 23, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Mount Shasta is December, with an average rainfall of 4.3 inches.

The rainless period of the year lasts for 2.6 months, from June 23 to September 11. The month with the least rain in Mount Shasta is August, with an average rainfall of 0.2 inches.

Average Monthly Rainfall in Mount Shasta

Average Monthly Rainfall in Mount ShastarainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inDec 94.5 inDec 94.5 inJul 300.1 inJul 300.1 inFeb 174.2 inFeb 174.2 inSep 110.5 inSep 110.5 inJun 230.5 inJun 230.5 inNowNow
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 3.7″4.2″3.3″1.9″1.4″0.7″0.2″0.2″0.6″1.8″3.7″4.3″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Mount Shasta experiences significant seasonal variation in monthly snowfall.

The snowy period of the year lasts for 5.7 months, from October 29 to April 19, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Mount Shasta is December, with an average snowfall of 8.5 inches.

The snowless period of the year lasts for 6.3 months, from April 19 to October 29. The least snow falls around July 27, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Mount Shasta

Average Monthly Snowfall in Mount ShastasnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inDec 309.4 inDec 309.4 inJul 270.0 inJul 270.0 inOct 291.0 inOct 291.0 inApr 191.0 inApr 191.0 in
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 7.9″6.4″4.2″1.4″0.0″0.0″0.0″0.0″0.0″0.3″3.3″8.5″

The length of the day in Mount Shasta varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 11 minutes of daylight; the longest day is June 20, with 15 hours, 10 minutes of daylight.

Hours of Daylight and Twilight in Mount Shasta

Hours of Daylight and Twilight in Mount ShastaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 10 minJun 2015 hr, 10 minJun 2012 hr, 11 minSep 2212 hr, 11 minSep 229 hr, 11 minDec 219 hr, 11 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.6h10.6h12.0h13.4h14.5h15.1h14.8h13.8h12.4h11.1h9.9h9.2h

The earliest sunrise is at 5:35 AM on June 14, and the latest sunrise is 2 hours, 7 minutes later at 7:42 AM on November 2. The earliest sunset is at 4:39 PM on December 7, and the latest sunset is 4 hours, 7 minutes later at 8:46 PM on June 26.

Daylight saving time (DST) is observed in Mount Shasta during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Mount Shasta

Sunrise & Sunset with Twilight and Daylight Saving Time in Mount ShastaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:35 AMJun 145:35 AM8:46 PMJun 268:46 PMJun 26Dec 74:39 PMDec 74:39 PM7:42 AMNov 27:42 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Mount Shasta

Solar Elevation and Azimuth in Mount ShastaJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0001010101020202030303040405050606000010101020202020303040405050602572NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. 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.

Moon Rise, Set & Phases in Mount Shasta

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 perceived humidity level in Mount Shasta, 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, remaining a virtually constant 0% throughout.

Humidity Comfort Levels in Mount Shasta

Humidity Comfort Levels in Mount ShastaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 310%Dec 310%Jul 100%Jul 100%NowNowdrydry
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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 Mount Shasta experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 8.4 months, from October 11 to June 23, with average wind speeds of more than 4.3 miles per hour. The windiest month of the year in Mount Shasta is March, with an average hourly wind speed of 4.9 miles per hour.

The calmer time of year lasts for 3.6 months, from June 23 to October 11. The calmest month of the year in Mount Shasta is August, with an average hourly wind speed of 3.9 miles per hour.

Average Wind Speed in Mount Shasta

Average Wind Speed in Mount ShastawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphMar 154.9 mphMar 154.9 mphAug 53.8 mphAug 53.8 mphOct 114.3 mphOct 114.3 mphJun 234.3 mphJun 234.3 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 4.54.84.94.74.54.43.93.94.14.44.54.6

The predominant average hourly wind direction in Mount Shasta varies throughout the year.

The wind is most often from the north for 6.2 months, from April 16 to October 23, with a peak percentage of 47% on June 8. The wind is most often from the south for 5.8 months, from October 23 to April 16, with a peak percentage of 39% on January 1.

Wind Direction in Mount Shasta

Wind Direction in Mount ShastaSNSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
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).

To characterize how pleasant the weather is in Mount Shasta 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 Mount Shasta for general outdoor tourist activities is from early July to mid August, with a peak score in the third week of July.

Tourism Score in Mount Shasta

Tourism Score in Mount Shastabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.46.40.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Mount Shasta for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.

Beach/Pool Score in Mount Shasta

Beach/Pool Score in Mount ShastaJanFebMarAprMayJunJulAugSepOctNovDec002244668810103.53.50.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitation
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

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 Mount Shasta typically lasts for 5.3 months (162 days), from around May 6 to around October 15, rarely starting before April 14 or after June 1, and rarely ending before September 24 or after November 3.

Time Spent in Various Temperature Bands and the Growing Season in Mount Shasta

Time Spent in Various Temperature Bands and the Growing Season in Mount Shastagrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 650%May 650%Oct 1550%Oct 1550%Jun 190%Jun 190%Sep 2490%Sep 2490%Apr 1410%Apr 1410%Nov 310%Nov 310%Aug 10100%Aug 10100%NowNowfreezingvery coldcoldcoolcomfortablewarmhot
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.

Based on growing degree days alone, the first spring blooms in Mount Shasta should appear around April 14, only rarely appearing before March 27 or after May 6.

Growing Degree Days in Mount Shasta

Growing Degree Days in Mount ShastaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FApr 1490°FApr 1490°FJul 10900°FJul 10900°FAug 311,800°FAug 311,800°FDec 312,302°FDec 312,302°F
The average growing degree days accumulated over the course of the year, 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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from May 13 to August 24, with an average daily incident shortwave energy per square meter above 7.1 kWh. The brightest month of the year in Mount Shasta is July, with an average of 8.2 kWh.

The darker period of the year lasts for 3.7 months, from October 30 to February 19, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest month of the year in Mount Shasta is December, with an average of 1.8 kWh.

Average Daily Incident Shortwave Solar Energy in Mount Shasta

Average Daily Incident Shortwave Solar Energy in Mount ShastabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 298.4 kWhJun 298.4 kWhDec 191.7 kWhDec 191.7 kWhMay 137.1 kWhMay 137.1 kWhAug 247.1 kWhAug 247.1 kWhOct 303.1 kWhOct 303.1 kWhFeb 193.1 kWhFeb 193.1 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 2.02.94.45.97.18.18.27.45.83.92.31.8

For the purposes of this report, the geographical coordinates of Mount Shasta are 41.310 deg latitude, -122.312 deg longitude, and 3,573 ft elevation.

The topography within 2 miles of Mount Shasta contains very significant variations in elevation, with a maximum elevation change of 1,096 feet and an average elevation above sea level of 3,681 feet. Within 10 miles contains very significant variations in elevation (11,919 feet). Within 50 miles also contains extreme variations in elevation (13,642 feet).

The area within 2 miles of Mount Shasta is covered by shrubs (79%) and trees (14%), within 10 miles by trees (53%) and shrubs (40%), and within 50 miles by trees (50%) and shrubs (42%).

This report illustrates the typical weather in Mount Shasta, 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 Mount Shasta.

For each station, the records are corrected for the elevation difference between that station and Mount Shasta 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 Mount Shasta is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mount Shasta and a given station.

The stations contributing to this reconstruction are:

  • Mount Shasta (KMHS, 99%, 1.9 mi, northwest, -39 ft elevation change)
  • Lonnie Pool Field Weaverville Airport (KO54, 0.7%, 50 mi, southwest, -1,224 ft elevation change)
  • Redding Municipal Airport (KRDD, 0.4%, 55 mi, south, -3,071 ft elevation change)
  • Alturas Municipal Airport (KAAT, 0.3%, 92 mi, east, 801 ft elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Mount Shasta 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 © OpenStreetMap contributors.

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.

Please review our full terms contained on our Terms of Service page.