Winter Weather at Klamath Falls Airport Oregon, United States

Daily high temperatures increase by 6°F, from 42°F to 48°F, rarely falling below 28°F or exceeding 59°F. The lowest daily average high temperature is 38°F on December 26.

Daily low temperatures are around 25°F, rarely falling below 9°F or exceeding 37°F. The lowest daily average low temperature is 22°F on December 23.

For reference, on August 4, the hottest day of the year, temperatures at Klamath Falls Airport typically range from 51°F to 85°F, while on December 23, the coldest day of the year, they range from 22°F to 38°F.

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.

Altınyayla, Turkey (6,683 miles away) and Dedeköy, Turkey (6,535 miles) are the far-away foreign places with temperatures most similar to Klamath Falls Airport (view comparison).

© OpenStreetMap contributors

Compare Klamath Falls Airport to another city:

CompareMap

The winter at Klamath Falls Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 65% throughout the season. The highest chance of overcast or mostly cloudy conditions is 66% on January 11.

The clearest day of the winter is January 31, with clear, mostly clear, or partly cloudy conditions 37% of the time.

For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 87%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Klamath Falls Airport, the chance of a wet day over the course of the winter is gradually decreasing, starting the season at 33% and ending it at 30%.

For reference, the year's highest daily chance of a wet day is 33% on December 7, and its lowest chance is 4% on August 4.

Over the course of the winter at Klamath Falls Airport, the chance of a day with only rain remains an essentially constant 18% throughout, the chance of a day with mixed snow and rain remains an essentially constant 7% throughout, and the chance of a day with only snow remains an essentially constant 4% throughout.

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 at Klamath Falls Airport is decreasing, starting the season at 2.4 inches, when it rarely exceeds 4.9 inches or falls below 0.5 inches, and ending the season at 1.8 inches, when it rarely exceeds 3.8 inches or falls below 0.5 inches.

The highest average 31-day accumulation is 2.4 inches on December 9.

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 at Klamath Falls Airport is decreasing, starting the season at 4.4 inches, when it rarely exceeds 11.3 inches or falls below 0.3 inches, and ending the season at 2.2 inches, when it rarely exceeds 6.2 inches.

The highest average 31-day accumulation is 5.6 inches on December 22.

Over the course of the winter at Klamath Falls Airport, 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, 53 minutes, implying an average daily increase of 1 minute, 16 seconds, and weekly increase of 8 minutes, 54 seconds.

The shortest day of the winter is December 20, with 9 hours, 6 minutes of daylight and the longest day is February 28, with 11 hours, 13 minutes of daylight.

The latest sunrise of the winter at Klamath Falls Airport is 7:35 AM on January 3 and the earliest sunrise is 52 minutes earlier at 6:43 AM on February 28.

The earliest sunset is 4:34 PM on December 9 and the latest sunset is 1 hour, 21 minutes later at 5:56 PM on February 28.

Daylight saving time is observed at Klamath Falls Airport during 2025, 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 5:31 AM and sets 15 hours, 16 minutes later, at 8:46 PM, while on December 21, the shortest day of the year, it rises at 7:32 AM and sets 9 hours, 6 minutes later, at 4:38 PM.

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.

The figure below presents a compact representation of key lunar data for the winter of 2025. 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.

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 at Klamath Falls Airport is essentially constant during the winter, remaining around 0% throughout.

For reference, on July 9, 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.

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 at Klamath Falls Airport is essentially constant during the winter, remaining within 0.2 miles per hour of 6.8 miles per hour throughout.

For reference, on March 16, the windiest day of the year, the daily average wind speed is 7.1 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 5.0 miles per hour.

The hourly average wind direction at Klamath Falls Airport throughout the winter is predominantly from the south, with a peak proportion of 45% on February 25.

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 at Klamath Falls Airport typically lasts for 3.7 months (112 days), from around June 3 to around September 23, rarely starting before May 15 or after June 22, and rarely ending before September 3 or after October 11.

The winter at Klamath Falls Airport is reliably fully outside of 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 at Klamath Falls Airport are very rapidly decreasing during the winter, decreasing by 2,093°F, from 2,099°F to 6°F, over the course of the season.

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 at Klamath Falls Airport is rapidly increasing during the winter, rising by 1.6 kWh, from 1.8 kWh to 3.4 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 1.7 kWh on December 16.

For the purposes of this report, the geographical coordinates of Klamath Falls Airport are 42.163 deg latitude, -121.743 deg longitude, and 4,091 ft elevation.

The topography within 2 miles of Klamath Falls Airport contains only modest variations in elevation, with a maximum elevation change of 466 feet and an average elevation above sea level of 4,106 feet. Within 10 miles contains only modest variations in elevation (2,418 feet). Within 50 miles contains large variations in elevation (7,795 feet).

The area within 2 miles of Klamath Falls Airport is covered by cropland (52%), shrubs (20%), artificial surfaces (15%), and grassland (12%), within 10 miles by shrubs (51%) and cropland (35%), and within 50 miles by shrubs (53%) and trees (32%).