Average Weather in Leavenworth Washington, United States
In Leavenworth, the summers are warm, dry, and mostly clear and the winters are freezing, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 25°F to 83°F and is rarely below 13°F or above 92°F.
The warm season lasts for 2.9 months, from June 16 to September 14, with an average daily high temperature above 73°F. The hottest day of the year is August 2, with an average high of 83°F and low of 60°F.
The cold season lasts for 3.3 months, from November 15 to February 24, with an average daily high temperature below 43°F. The coldest day of the year is December 29, with an average low of 25°F and high of 33°F.
Average High and Low Temperature
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 Leavenworth, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Leavenworth begins around June 12 and lasts for 3.8 months, ending around October 5. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 79% of the time, and overcast or mostly cloudy 21% of the time.
The cloudier part of the year begins around October 5 and lasts for 8.2 months, ending around June 12. On January 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 66% of the time, and clear, mostly clear, or partly cloudy 34% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Leavenworth varies significantly throughout the year.
The wetter season lasts 5.7 months, from October 15 to April 5, with a greater than 27% chance of a given day being a wet day. The chance of a wet day peaks at 47% on November 18.
The drier season lasts 6.3 months, from April 5 to October 15. The smallest chance of a wet day is 6% on August 5.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Leavenworth changes throughout the year.
Rain alone is the most common for 11 months, from January 8 to December 13. The highest chance of a day with rain alone is 41% on November 9.
Snow alone is the most common for 3.7 weeks, from December 13 to January 8. The highest chance of a day with snow alone is 18% on December 27.
Daily Chance of Precipitation
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. Leavenworth experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 11 months, from August 20 to July 6, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 14, with an average total accumulation of 4.0 inches.
The rainless period of the year lasts for 1.5 months, from July 6 to August 20. The least rain falls around July 29, with an average total accumulation of 0.4 inches.
Average Monthly Rainfall
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. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Leavenworth experiences significant seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.9 months, from October 28 to March 26, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 29, with an average total liquid-equivalent accumulation of 1.9 inches.
The snowless period of the year lasts for 7.1 months, from March 26 to October 28. The least snow falls around July 25, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Leavenworth varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 26 minutes of daylight; the longest day is June 21, with 15 hours, 59 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:04 AM on June 16, and the latest sunrise is 2 hours, 47 minutes later at 7:51 AM on November 4. The earliest sunset is at 4:10 PM on December 10, and the latest sunset is 4 hours, 54 minutes later at 9:04 PM on June 25.
Daylight saving time (DST) is observed in Leavenworth during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
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 Leavenworth, 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
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 Leavenworth does not vary significantly over the course of the year, remaining within 0.3 miles per hour of 2.5 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction in Leavenworth is from the west throughout the year.
Leavenworth is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.1 months, from June 26 to September 29, with an average temperature above 54°F. The day of the year with the warmest water is August 18, with an average temperature of 56°F.
The time of year with cooler water lasts for 4.0 months, from December 11 to April 12, with an average temperature below 48°F. The day of the year with the coolest water is February 11, with an average temperature of 46°F.
Average Water Temperature
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 21, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest day of the year is July 14, with an average of 7.4 kWh.
The darker period of the year lasts for 3.7 months, from October 24 to February 16, with an average daily incident shortwave energy per square meter below 2.4 kWh. The darkest day of the year is December 24, with an average of 1.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Leavenworth are 47.596 deg latitude, -120.661 deg longitude, and 1,716 ft elevation.
The topography within 2 miles of Leavenworth contains large variations in elevation, with a maximum elevation change of 3,015 feet and an average elevation above sea level of 1,618 feet. Within 10 miles contains large variations in elevation (7,703 feet). Within 50 miles also contains extreme variations in elevation (10,322 feet).
The area within 2 miles of Leavenworth is covered by shrubs (47%) and sparse vegetation (37%), within 10 miles by shrubs (34%) and trees (31%), and within 50 miles by shrubs (38%) and trees (37%).
This report illustrates the typical weather in Leavenworth, 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 Leavenworth.
For each station, the records are corrected for the elevation difference between that station and Leavenworth 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 Leavenworth is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Leavenworth and a given station.
The stations contributing to this reconstruction are: Pangborn Field (59%, 41 kilometers, southeast); Stampede Pass (19%, 62 kilometers, southwest); Arlington Municipal Airport (11%, 128 kilometers, northwest); and Omak Airport (12%, 129 kilometers, northeast).
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.