Average Weather in January in Alturas California, United States
In Alturas, the month of January is characterized by gradually rising daily high temperatures, with daily highs increasing by 4°F, from 40°F to 44°F over the course of the month, and rarely exceeding 56°F or dropping below 30°F.
Daily low temperatures increase by 2°F, from 21°F to 23°F, rarely falling below 6°F or exceeding 35°F.
For reference, on July 29, the hottest day of the year, temperatures in Alturas typically range from 48°F to 88°F, while on December 31, the coldest day of the year, they range from 21°F to 40°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. 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 January
The month of January in Alturas experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 59% throughout the month. The highest chance of overcast or mostly cloudy conditions is 61% on January 10. The lowest chance of overcast or mostly cloudy conditions is 58% on January 26.
The clearest day of the month is January 26, with clear, mostly clear, or partly cloudy conditions 42% of the time.
For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 61%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 88%.
Cloud Cover in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Alturas, the chance of a wet day over the course of January is gradually decreasing, starting the month at 22% and ending it at 19%.
For reference, the year's highest daily chance of a wet day is 25% on December 7, and its lowest chance is 3% on August 14.
Over the course of January in Alturas, the chance of a day with only rain remains an essentially constant 12% throughout, the chance of a day with mixed snow and rain remains an essentially constant 6% throughout, and the chance of a day with only snow remains an essentially constant 3% throughout.
Probability of Precipitation in January
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during January in Alturas is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.9 inches or falling below 0.1 inches.
The lowest average 31-day accumulation is 0.9 inches on January 19.
Average Monthly Rainfall in January
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during January in Alturas is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.1 inches or falling to 0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Alturas, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 48 minutes, implying an average daily increase of 1 minute, 36 seconds, and weekly increase of 11 minutes, 14 seconds.
The shortest day of the month is January 1, with 9 hours, 15 minutes of daylight and the longest day is January 31, with 10 hours, 3 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Alturas is 7:28 AM on January 3 and the earliest sunrise is 14 minutes earlier at 7:14 AM on January 31.
The earliest sunset is 4:43 PM on January 1 and the latest sunset is 34 minutes later at 5:17 PM on January 31.
Daylight saving time is observed in Alturas during 2017, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:28 AM and sets 15 hours, 11 minutes later, at 8:39 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 9 hours, 10 minutes later, at 4:35 PM.
Sunrise & Sunset with Twilight in January
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 Alturas is essentially constant during January, remaining around 0% throughout.
Humidity Comfort Levels in January
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 Alturas is essentially constant during January, remaining within 0.1 miles per hour of 4.8 miles per hour throughout.
For reference, on March 16, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on August 6, the calmest day of the year, the daily average wind speed is 3.5 miles per hour.
The lowest daily average wind speed during January is 4.7 miles per hour on January 20.
Average Wind Speed in January
Wind Direction in January
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 Alturas is gradually increasing during January, rising by 0.7 kWh, from 1.9 kWh to 2.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Alturas are 41.487 deg latitude, -120.543 deg longitude, and 4,383 ft elevation.
The topography within 2 miles of Alturas contains only modest variations in elevation, with a maximum elevation change of 187 feet and an average elevation above sea level of 4,382 feet. Within 10 miles contains only modest variations in elevation (2,031 feet). Within 50 miles contains large variations in elevation (6,535 feet).
The area within 2 miles of Alturas is covered by shrubs (45%) and cropland (41%), within 10 miles by shrubs (80%) and cropland (12%), and within 50 miles by shrubs (78%) and trees (11%).
This report illustrates the typical weather in Alturas year round, 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 is only a single weather station, Alturas Municipal Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Alturas.
At a distance of 2 kilometer from Alturas, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Alturas according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.