Average Weather in Fall City Washington, United States
In Fall City, the summers are short, warm, and partly cloudy and the winters are chilly, wet, and overcast. Over the course of the year, the temperature typically varies from 36°F to 78°F and is rarely below 25°F or above 89°F.
The warm season lasts for 2.8 months, from June 22 to September 17, with an average daily high temperature above 71°F. The hottest day of the year is August 3, with an average high of 78°F and low of 59°F.
The cool season lasts for 3.6 months, from November 13 to March 1, with an average daily high temperature below 51°F. The coldest day of the year is December 23, with an average low of 36°F and high of 44°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 Fall City, 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 Fall City begins around June 20 and lasts for 3.5 months, ending around October 6. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.
The cloudier part of the year begins around October 6 and lasts for 8.5 months, ending around June 20. On November 29, the cloudiest day of the year, the sky is overcast or mostly cloudy 78% of the time, and clear, mostly clear, or partly cloudy 22% 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 Fall City varies very significantly throughout the year.
The wetter season lasts 7.4 months, from October 7 to May 18, with a greater than 36% chance of a given day being a wet day. The chance of a wet day peaks at 62% on November 18.
The drier season lasts 4.6 months, from May 18 to October 7. The smallest chance of a wet day is 10% on August 3.
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 throughout the year is rain alone, with a peak probability of 60% on November 15.
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. Fall City experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Fall City. The most rain falls during the 31 days centered around November 21, with an average total accumulation of 9.9 inches.
The least rain falls around July 30, with an average total accumulation of 0.8 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. Fall City experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 2.2 months, from December 1 to February 7, 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 30, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 9.8 months, from February 7 to December 1. The least snow falls around July 11, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Fall City 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 5:09 AM on June 15, and the latest sunrise is 2 hours, 47 minutes later at 7:56 AM on November 4. The earliest sunset is at 4:16 PM on December 11, and the latest sunset is 4 hours, 53 minutes later at 9:09 PM on June 25.
Daylight saving time (DST) is observed in Fall City 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 Fall City, 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 Fall City experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.3 months, from October 22 to April 2, with average wind speeds of more than 2.3 miles per hour. The windiest day of the year is December 29, with an average hourly wind speed of 3.0 miles per hour.
The calmer time of year lasts for 6.6 months, from April 2 to October 22. The calmest day of the year is August 5, with an average hourly wind speed of 1.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Fall City varies throughout the year.
The wind is most often from the south for 2.1 months, from February 23 to April 26 and for 2.3 months, from September 30 to December 7, with a peak percentage of 49% on November 18. The wind is most often from the west for 4.5 months, from April 26 to September 12, with a peak percentage of 48% on June 20. The wind is most often from the east for 2.6 weeks, from September 12 to September 30 and for 2.6 months, from December 7 to February 23, with a peak percentage of 33% on September 27.
Fall City 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 25 to September 29, with an average temperature above 54°F. The day of the year with the warmest water is August 19, with an average temperature of 56°F.
The time of year with cooler water lasts for 4.1 months, from December 10 to April 12, with an average temperature below 48°F. The day of the year with the coolest water is February 10, 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 3.0 months, from May 24 to August 23, with an average daily incident shortwave energy per square meter above 5.5 kWh. The brightest day of the year is July 21, with an average of 6.7 kWh.
The darker period of the year lasts for 3.9 months, from October 23 to February 20, with an average daily incident shortwave energy per square meter below 2.1 kWh. The darkest day of the year is December 24, with an average of 0.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Fall City are 47.567 deg latitude, -121.889 deg longitude, and 469 ft elevation.
The topography within 2 miles of Fall City contains very significant variations in elevation, with a maximum elevation change of 899 feet and an average elevation above sea level of 324 feet. Within 10 miles contains very significant variations in elevation (4,685 feet). Within 50 miles also contains extreme variations in elevation (14,383 feet).
The area within 2 miles of Fall City is covered by trees (56%), cropland (27%), and artificial surfaces (11%), within 10 miles by trees (70%) and shrubs (14%), and within 50 miles by trees (55%) and shrubs (15%).
This report illustrates the typical weather in Fall City, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Fall City.
For each station, the records are corrected for the elevation difference between that station and Fall City 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 Fall City is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fall City and a given station.
The stations contributing to this reconstruction are: Renton Municipal Airport (63%, 26 kilometers, west); Snohomish County Airport (Paine Field) (30%, 48 kilometers, northwest); and Stampede Pass (8%, 53 kilometers, southeast).
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.