Average Weather in November in Sammamish Washington, United States
Daily high temperatures decrease by 8°F, from 55°F to 47°F, rarely falling below 41°F or exceeding 62°F.
Daily low temperatures decrease by 6°F, from 45°F to 39°F, rarely falling below 30°F or exceeding 52°F.
For reference, on August 3, the hottest day of the year, temperatures in Sammamish typically range from 59°F to 78°F, while on December 23, the coldest day of the year, they range from 37°F to 45°F.
Average High and Low Temperature in November
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on November. 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 November
The month of November in Sammamish experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 68% to 76%. The highest chance of overcast or mostly cloudy conditions is 76% on November 30.
The clearest day of the month is November 1, with clear, mostly clear, or partly cloudy conditions 32% of the time.
For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
Cloud Cover Categories in November
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sammamish, the chance of a wet day over the course of November is increasing, starting the month at 54% and ending it at 59%.
For reference, the year's highest daily chance of a wet day is 61% on November 18, and its lowest chance is 9% on August 6.
Over the course of November in Sammamish, the chance of a day with only rain increases from 54% to 57%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in November
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 November in Sammamish is rapidly increasing, starting the month at 7.6 inches, when it rarely exceeds 11.6 inches or falls below 3.4 inches, and ending the month at 8.7 inches, when it rarely exceeds 13.5 inches or falls below 4.0 inches.
The highest average 31-day accumulation is 9.0 inches on November 21.
Average Monthly Rainfall in November
Over the course of November in Sammamish, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 13 minutes, implying an average daily decrease of 2 minutes, 32 seconds, and weekly decrease of 17 minutes, 41 seconds.
The shortest day of the month is November 30, with 8 hours, 45 minutes of daylight and the longest day is November 1, with 9 hours, 58 minutes of daylight.
Hours of Daylight and Twilight in November
The latest sunrise of the month in Sammamish is 7:55 AM on November 3 and the earliest sunrise is 58 minutes earlier at 6:57 AM on November 4.
The latest sunset is 5:50 PM on November 1 and the earliest sunset is 1 hour, 31 minutes earlier at 4:19 PM on November 30.
Daylight saving time (DST) ends at 1:00 AM on November 4, 2018, shifting sunrise and sunset to be an hour earlier.
For reference, on June 21, the longest day of the year, the Sun rises at 5:10 AM and sets 15 hours, 60 minutes later, at 9:09 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 25 minutes later, at 4:19 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in November
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 Sammamish is essentially constant during November, remaining around 0% throughout.
For reference, on August 6, 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.
Humidity Comfort Levels in November
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 Sammamish is gradually increasing during November, increasing from 4.5 miles per hour to 5.2 miles per hour over the course of the month.
For reference, on December 4, the windiest day of the year, the daily average wind speed is 5.2 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 2.6 miles per hour.
Average Wind Speed in November
Wind Direction in November
Sammamish 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 surface water temperature in Sammamish is gradually decreasing during November, falling by 2°F, from 51°F to 49°F, over the course of the month.
Average Water Temperature in November
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 Sammamish typically lasts for 8.6 months (264 days), from around March 2 to around November 22, rarely starting before February 9 or after March 28, and rarely ending before October 30 or after December 19.
During November in Sammamish, the chance that a given day is within the growing season is very rapidly decreasing falling from 87% to 35% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in November
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 in Sammamish are essentially constant during November, remaining within 14°F of 2,192°F throughout.
Growing Degree Days in November
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 Sammamish is gradually decreasing during November, falling by 0.7 kWh, from 1.7 kWh to 1.0 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in November
For the purposes of this report, the geographical coordinates of Sammamish are 47.642 deg latitude, -122.080 deg longitude, and 253 ft elevation.
The topography within 2 miles of Sammamish contains significant variations in elevation, with a maximum elevation change of 554 feet and an average elevation above sea level of 202 feet. Within 10 miles contains significant variations in elevation (2,441 feet). Within 50 miles contains large variations in elevation (7,910 feet).
The area within 2 miles of Sammamish is covered by artificial surfaces (40%), trees (27%), water (17%), and herbaceous vegetation (12%), within 10 miles by trees (39%) and artificial surfaces (35%), and within 50 miles by trees (54%) and artificial surfaces (13%).
This report illustrates the typical weather in Sammamish 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 are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Sammamish.
For each station, the records are corrected for the elevation difference between that station and Sammamish 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 Sammamish is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sammamish and a given station.
The stations contributing to this reconstruction are: Renton Municipal Airport (41%, 19 kilometers, southwest); King County International Airport (37%, 21 kilometers, southwest); Snohomish County Airport (Paine Field) (19%, 33 kilometers, northwest); and Stampede Pass (2.5%, 69 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.
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.