Average Weather in Williams Lake Canada
In Williams Lake, the summers are comfortable and partly cloudy and the winters are freezing, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 15°F to 77°F and is rarely below -10°F or above 87°F.
Based on the tourism score, the best time of year to visit Williams Lake for warm-weather activities is from mid July to mid August.
The warm season lasts for 3.3 months, from June 3 to September 13, with an average daily high temperature above 67°F. The hottest day of the year is August 3, with an average high of 77°F and low of 52°F.
The cold season lasts for 3.1 months, from November 16 to February 19, with an average daily high temperature below 36°F. The coldest day of the year is January 1, with an average low of 15°F and high of 26°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
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
In Williams Lake, 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 Williams Lake begins around May 31 and lasts for 4.1 months, ending around October 4. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.
The cloudier part of the year begins around October 4 and lasts for 7.9 months, ending around May 31. On January 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 75% of the time, and clear, mostly clear, or partly cloudy 25% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Williams Lake varies throughout the year.
The wetter season lasts 7.9 months, from May 22 to January 20, with a greater than 21% chance of a given day being a wet day. The chance of a wet day peaks at 30% on November 1.
The drier season lasts 4.1 months, from January 20 to May 22. The smallest chance of a wet day is 12% on April 1.
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 Williams Lake changes throughout the year.
Rain alone is the most common for 9.5 months, from February 15 to December 1. The highest chance of a day with rain alone is 29% on June 22.
Snow alone is the most common for 2.5 months, from December 1 to February 15. The highest chance of a day with snow alone is 15% on December 24.
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. Williams Lake experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 7.9 months, from April 8 to December 6, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 30, with an average total accumulation of 1.6 inches.
The rainless period of the year lasts for 4.1 months, from December 6 to April 8. The least rain falls around February 18, with an average total accumulation of 0.3 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. Williams Lake experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.1 months, from October 18 to March 21, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 1, with an average total liquid-equivalent accumulation of 0.7 inches.
The snowless period of the year lasts for 6.9 months, from March 21 to October 18. The least snow falls around July 30, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Williams Lake varies extremely over the course of the year. In 2019, the shortest day is December 21, with 7 hours, 43 minutes of daylight; the longest day is June 21, with 16 hours, 46 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:47 AM on June 17, and the latest sunrise is 3 hours, 30 minutes later at 8:17 AM on December 30. The earliest sunset is at 3:56 PM on December 13, and the latest sunset is 5 hours, 37 minutes later at 9:33 PM on June 24.
Daylight saving time (DST) is observed in Williams Lake during 2019, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.
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 Williams Lake, 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Williams Lake experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.1 months, from October 5 to May 10, with average wind speeds of more than 3.7 miles per hour. The windiest day of the year is December 5, with an average hourly wind speed of 4.3 miles per hour.
The calmer time of year lasts for 4.9 months, from May 10 to October 5. The calmest day of the year is August 2, with an average hourly wind speed of 3.2 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Williams Lake varies throughout the year.
The wind is most often from the south for 2.0 months, from February 25 to April 25 and for 1.6 months, from October 2 to November 21, with a peak percentage of 40% on October 23. The wind is most often from the west for 5.3 months, from April 25 to October 2, with a peak percentage of 48% on July 15. The wind is most often from the east for 3.1 months, from November 21 to February 25, with a peak percentage of 39% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Williams Lake throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Williams Lake for general outdoor tourist activities is from mid July to mid August, with a peak score in the first week of August.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Williams Lake for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 Williams Lake typically lasts for 4.3 months (133 days), from around May 11 to around September 21, rarely starting before April 24 or after May 27, and rarely ending before September 2 or after October 8.
Time Spent in Various Temperature Bands and the Growing Season
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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.
Based on growing degree days alone, the first spring blooms in Williams Lake should appear around May 13, only rarely appearing before April 30 or after May 27.
Growing Degree Days
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 3.5 months, from May 3 to August 21, with an average daily incident shortwave energy per square meter above 5.4 kWh. The brightest day of the year is July 17, with an average of 6.6 kWh.
The darker period of the year lasts for 3.8 months, from October 23 to February 16, with an average daily incident shortwave energy per square meter below 1.9 kWh. The darkest day of the year is December 23, with an average of 0.7 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Williams Lake are 52.142 deg latitude, -122.145 deg longitude, and 2,618 ft elevation.
The topography within 2 miles of Williams Lake contains very significant variations in elevation, with a maximum elevation change of 1,581 feet and an average elevation above sea level of 2,397 feet. Within 10 miles contains very significant variations in elevation (2,454 feet). Within 50 miles contains large variations in elevation (5,266 feet).
The area within 2 miles of Williams Lake is covered by trees (42%), sparse vegetation (31%), shrubs (11%), and artificial surfaces (10%), within 10 miles by trees (69%) and shrubs (14%), and within 50 miles by trees (62%) and shrubs (21%).
This report illustrates the typical weather in Williams Lake, 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 Williams Lake.
For each station, the records are corrected for the elevation difference between that station and Williams Lake 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 Williams Lake is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Williams Lake and a given station.
The stations contributing to this reconstruction are: Williams Lake Airport (93%, 8 kilometers, northeast); Big Creek (3.4%, 118 kilometers, southwest); and Puntzi Mountain Airport (3.8%, 136 kilometers, west).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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.