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Climate and Average Weather Year Round in Clyde Hill Washington, United States

In Clyde Hill, the summers are short, warm, dry, and partly cloudy and the winters are very cold, wet, and mostly cloudy. Over the course of the year, the temperature typically varies from 37°F to 79°F and is rarely below 27°F or above 88°F.

Based on the tourism score, the best time of year to visit Clyde Hill for warm-weather activities is from mid July to late August.

Climate in Clyde Hill

coldcoolcomfortablewarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow75%75%27%27%overcastclearprecipitation: 8.3 inprecipitation: 8.3 in0.7 in0.7 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 7.4tourism score: 7.40.10.1
Clyde Hill weather by month. Click on each chart for more information.

Average Temperature in Clyde Hill

The warm season lasts for 2.8 months, from June 21 to September 14, with an average daily high temperature above 72°F. The hottest day of the year is August 1, with an average high of 79°F and low of 60°F.

The cool season lasts for 3.7 months, from November 12 to March 2, with an average daily high temperature below 53°F. The coldest day of the year is December 23, with an average low of 37°F and high of 46°F.

Average High and Low Temperature in Clyde Hill

Average High and Low Temperature in Clyde HillwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FDec 2346°FDec 2346°FAug 179°FAug 179°F37°F37°F60°F60°FJun 2172°FJun 2172°FSep 1472°FSep 1472°FNov 1253°FNov 1253°FMar 253°FMar 253°F56°F56°F56°F56°F43°F43°F41°F41°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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 Clyde Hill

Average Hourly Temperature in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldvery coldcoldcoldcoolcomfortablewarm
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
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Nantes, France (4,981 miles away) is the far-away foreign place with temperatures most similar to Clyde Hill (view comparison).

Compare Clyde Hill to another city:

Clouds

In Clyde Hill, 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 Clyde Hill begins around June 15 and lasts for 3.8 months, ending around October 7. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time.

The cloudier part of the year begins around October 7 and lasts for 8.2 months, ending around June 15. On January 19, the cloudiest day of the year, the sky is overcast or mostly cloudy 73% of the time, and clear, mostly clear, or partly cloudy 27% of the time.

Cloud Cover Categories in Clyde Hill

Cloud Cover Categories in Clyde HillclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 375%Aug 375%Jan 1927%Jan 1927%Jun 1550%Jun 1550%Oct 751%Oct 751%NowNowclearpartly cloudymostly cloudyovercastmostly clear
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Clyde Hill varies very significantly throughout the year.

The wetter season lasts 6.7 months, from October 10 to May 1, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 59% on November 18.

The drier season lasts 5.3 months, from May 1 to October 10. The smallest chance of a wet day is 9% 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 throughout the year is rain alone, with a peak probability of 58% on November 18.

Daily Chance of Precipitation in Clyde Hill

Daily Chance of Precipitation in Clyde HillwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 1859%Nov 1859%Aug 59%Aug 59%Jan 150%Jan 150%Oct 1034%Oct 1034%May 134%May 134%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. Clyde Hill experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Clyde Hill. The most rain falls during the 31 days centered around November 22, with an average total accumulation of 8.3 inches.

The least rain falls around July 30, with an average total accumulation of 0.7 inches.

Average Monthly Rainfall in Clyde Hill

Average Monthly Rainfall in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inNov 228.3 inNov 228.3 inJul 300.7 inJul 300.7 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall in Clyde Hill does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall in Clyde Hill

Average Liquid-Equivalent Monthly Snowfall in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inDec 300.2 inDec 300.2 inJul 110.0 inJul 110.0 inJan 210.1 inJan 210.1 inNowNow
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day in Clyde Hill varies significantly over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 25 minutes of daylight; the longest day is June 20, with 16 hours, 0 minutes of daylight.

Hours of Daylight and Twilight in Clyde Hill

Hours of Daylight and Twilight in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2016 hr, 0 minJun 2016 hr, 0 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 228 hr, 25 minDec 218 hr, 25 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:10 AM on June 15, and the latest sunrise is 2 hours, 51 minutes later at 8:01 AM on November 6. The earliest sunset is at 4:17 PM on December 10, and the latest sunset is 4 hours, 54 minutes later at 9:10 PM on June 25.

Daylight saving time (DST) is observed in Clyde Hill during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.

Sunrise & Sunset with Twilight and Daylight Saving Time in Clyde Hill

Sunrise & Sunset with Twilight and Daylight Saving Time in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:10 AMJun 155:10 AM9:10 PMJun 259:10 PMJun 25Dec 104:17 PMDec 104:17 PM8:01 AMNov 68:01 AMNov 6Mar 14DSTMar 14DSTDSTNov 7DSTNov 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Moon

The figure below presents a compact representation of key lunar data for 2021. 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.

Moon Rise, Set & Phases in Clyde Hill

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

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 Clyde Hill, 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 in Clyde Hill

Humidity Comfort Levels in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 280%Jan 280%Jul 190%Jul 190%NowNowdrydryhumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 Clyde Hill experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from October 17 to April 22, with average wind speeds of more than 3.9 miles per hour. The windiest day of the year is December 4, with an average hourly wind speed of 5.2 miles per hour.

The calmer time of year lasts for 5.8 months, from April 22 to October 17. The calmest day of the year is August 2, with an average hourly wind speed of 2.6 miles per hour.

Average Wind Speed in Clyde Hill

Average Wind Speed in Clyde HillwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphDec 45.2 mphDec 45.2 mphAug 22.6 mphAug 22.6 mphOct 173.9 mphOct 173.9 mphApr 223.9 mphApr 223.9 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Clyde Hill varies throughout the year.

The wind is most often from the north for 2.6 months, from June 29 to September 17, with a peak percentage of 43% on July 30. The wind is most often from the south for 9.4 months, from September 17 to June 29, with a peak percentage of 52% on January 1.

Wind Direction in Clyde Hill

Wind Direction in Clyde HillSNSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Clyde Hill 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 28, 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 10 to April 11, 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 in Clyde Hill

Average Water Temperature in Clyde HillwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec42°F42°F44°F44°F46°F46°F48°F48°F50°F50°F52°F52°F54°F54°F56°F56°F58°F58°F60°F60°FAug 1856°FAug 1856°F46°FFeb 1046°FFeb 10Jun 2554°FJun 2554°FSep 2854°FSep 2854°FDec 1048°FDec 1048°FApr 1148°FApr 1148°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Clyde Hill 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 Clyde Hill for general outdoor tourist activities is from mid July to late August, with a peak score in the first week of August.

Tourism Score in Clyde Hill

Tourism Score in Clyde Hillbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.47.40.10.1NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Clyde Hill for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.

Beach/Pool Score in Clyde Hill

Beach/Pool Score in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec002244668810102.32.30.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

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 Clyde Hill typically lasts for 9.0 months (271 days), from around February 26 to around November 24, rarely starting before January 21 or after March 20, and rarely ending before November 1 or after December 20.

Time Spent in Various Temperature Bands and the Growing Season in Clyde Hill

Time Spent in Various Temperature Bands and the Growing Season in Clyde Hillgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 2650%Feb 2650%Nov 2450%Nov 2490%Mar 2090%Mar 2090%Nov 190%Nov 110%Jan 2110%Jan 2110%Dec 2010%Dec 20Jul 14100%Jul 14100%NowNowvery coldcoldcoolcomfortablewarm
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
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within 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.

Based on growing degree days alone, the first spring blooms in Clyde Hill should appear around April 7, only rarely appearing before March 14 or after April 28.

Growing Degree Days in Clyde Hill

Growing Degree Days in Clyde HillJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FApr 790°FApr 790°FJul 9900°FJul 9900°FSep 11,800°FSep 11,800°FDec 312,344°FDec 312,344°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 15 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 3.8 months, from October 25 to February 18, with an average daily incident shortwave energy per square meter below 2.1 kWh. The darkest day of the year is December 25, with an average of 0.9 kWh.

Average Daily Incident Shortwave Solar Energy in Clyde Hill

Average Daily Incident Shortwave Solar Energy in Clyde HillbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 216.7 kWhJul 216.7 kWhDec 250.9 kWhDec 250.9 kWhMay 155.5 kWhMay 155.5 kWhOct 252.1 kWhOct 252.1 kWhFeb 182.1 kWhFeb 182.1 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Clyde Hill are 47.632 deg latitude, -122.218 deg longitude, and 302 ft elevation.

The topography within 2 miles of Clyde Hill contains only modest variations in elevation, with a maximum elevation change of 430 feet and an average elevation above sea level of 114 feet. Within 10 miles contains only modest variations in elevation (1,594 feet). Within 50 miles contains very significant variations in elevation (7,910 feet).

The area within 2 miles of Clyde Hill is covered by artificial surfaces (41%), water (32%), and herbaceous vegetation (19%), within 10 miles by artificial surfaces (57%) and water (18%), and within 50 miles by trees (53%) and water (14%).

Data Sources

This report illustrates the typical weather in Clyde Hill, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Clyde Hill.

For each station, the records are corrected for the elevation difference between that station and Clyde Hill 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 Clyde Hill is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Clyde Hill and a given station.

The stations contributing to this reconstruction are: King County International Airport (KBFI, 75%, 13 kilometers, southwest) and Snohomish County Airport (Paine Field) (KPAE, 25%, 31 kilometers, north).

Other Data

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 airports 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.

Disclaimer

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.