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Climate and Average Weather Year Round at Bowers Field Washington, United States

At Bowers Field, the summers are warm, dry, and mostly clear and the winters are freezing, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from 23°F to 88°F and is rarely below 9°F or above 99°F.

Based on the tourism score, the best time of year to visit Bowers Field for warm-weather activities is from early July to mid August.

Climate at Bowers Field

very coldcoldcoolcomfortablewarmhotwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow81%81%35%35%clearovercastprecipitation: 2.7 inprecipitation: 2.7 in0.2 in0.2 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 7.2tourism score: 7.20.00.0
Bowers Field weather by month. Click on each chart for more information.

The hot season lasts for 3.0 months, from June 13 to September 15, with an average daily high temperature above 77°F. The hottest month of the year at Bowers Field is July, with an average high of 86°F and low of 57°F.

The cold season lasts for 3.0 months, from November 18 to February 17, with an average daily high temperature below 45°F. The coldest month of the year at Bowers Field is December, with an average low of 24°F and high of 35°F.

Average High and Low Temperature at Bowers Field

Average High and Low Temperature at Bowers FieldhotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FDec 2334°FDec 2334°FJul 3188°FJul 3188°F23°F23°F58°F58°FJun 1377°FJun 1377°FSep 1577°FSep 1577°FFeb 1745°FFeb 1745°F52°F52°F47°F47°F30°F30°F28°F28°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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 36°F44°F54°F62°F70°F78°F86°F86°F77°F62°F46°F35°F
Temp. 30°F34°F42°F48°F57°F63°F70°F70°F61°F49°F37°F28°F
Low 25°F28°F33°F38°F46°F52°F57°F56°F47°F38°F30°F24°F

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 at Bowers Field

Average Hourly Temperature at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingfreezingfreezingvery coldvery coldcoldcoldcoolcomfortablewarmhotcomfortable
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.

Липково, Macedonia (5,859 miles away) is the far-away foreign place with temperatures most similar to Bowers Field (view comparison).

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At Bowers Field, 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 at Bowers Field begins around June 8 and lasts for 3.9 months, ending around October 6.

The clearest month of the year at Bowers Field is July, during which on average the sky is clear, mostly clear, or partly cloudy 77% of the time.

The cloudier part of the year begins around October 6 and lasts for 8.1 months, ending around June 8.

The cloudiest month of the year at Bowers Field is January, during which on average the sky is overcast or mostly cloudy 63% of the time.

Cloud Cover Categories at Bowers Field

Cloud Cover Categories at Bowers FieldclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 281%Aug 281%Jan 1535%Jan 1535%Jun 858%Jun 858%Oct 659%Oct 659%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 63%60%58%54%49%38%23%24%33%48%58%62%
Clearer 37%40%42%46%51%62%77%76%67%52%42%38%

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

The wetter season lasts 5.5 months, from October 16 to March 30, with a greater than 21% chance of a given day being a wet day. The month with the most wet days at Bowers Field is November, with an average of 10.6 days with at least 0.04 inches of precipitation.

The drier season lasts 6.5 months, from March 30 to October 16. The month with the fewest wet days at Bowers Field is August, with an average of 1.6 days with at least 0.04 inches of precipitation.

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 at Bowers Field changes throughout the year.

Rain alone is the most common for 11 months, from January 16 to December 9. The month with the most days of rain alone at Bowers Field is November, with an average of 7.5 days.

Snow alone is the most common for 1.2 months, from December 9 to January 16. The month with the most days of snow alone at Bowers Field is December, with an average of 4.2 days.

Daily Chance of Precipitation at Bowers Field

Daily Chance of Precipitation at Bowers FieldrainJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 2737%Nov 2737%Aug 44%Aug 44%Jan 1632%Jan 1632%Oct 1621%Oct 1621%Mar 3021%Mar 3021%NowNowsnowrainmixed
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 3.3d5.1d6.4d4.9d4.7d3.2d1.8d1.6d2.9d6.1d7.5d3.7d
Mixed 2.9d1.8d0.8d0.1d0.0d0.0d0.0d0.0d0.0d0.2d1.8d2.7d
Snow 3.5d1.3d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d1.3d4.2d
Any 9.7d8.2d7.4d5.0d4.7d3.2d1.8d1.6d2.9d6.4d10.6d10.7d

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. Bowers Field experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.2 months, from September 13 to June 20, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Bowers Field is November, with an average rainfall of 2.1 inches.

The rainless period of the year lasts for 2.8 months, from June 20 to September 13. The month with the least rain at Bowers Field is August, with an average rainfall of 0.3 inches.

Average Monthly Rainfall at Bowers Field

Average Monthly Rainfall at Bowers FieldrainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inNov 122.1 inNov 122.1 inAug 20.2 inAug 20.2 inFeb 201.4 inFeb 201.4 inSep 130.5 inSep 130.5 inJun 200.5 inJun 200.5 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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 1.1″1.4″1.2″0.8″0.8″0.6″0.3″0.3″0.5″1.3″2.1″1.3″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Bowers Field experiences extreme seasonal variation in monthly snowfall.

The snowy period of the year lasts for 4.7 months, from October 26 to March 15, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Bowers Field is December, with an average snowfall of 12.1 inches.

The snowless period of the year lasts for 7.3 months, from March 15 to October 26. The least snow falls around July 16, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Bowers Field

Average Monthly Snowfall at Bowers FieldsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inDec 3012.9 inDec 3012.9 inJul 160.0 inJul 160.0 inOct 261.0 inOct 261.0 inMar 151.0 inMar 151.0 in
The average 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 11.2″4.7″0.9″0.1″0.0″0.0″0.0″0.0″0.0″0.3″5.0″12.1″

The length of the day at Bowers Field varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 30 minutes of daylight; the longest day is June 20, with 15 hours, 54 minutes of daylight.

Hours of Daylight and Twilight at Bowers Field

Hours of Daylight and Twilight at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 9 minMar 1912 hr, 9 minMar 1915 hr, 54 minJun 2015 hr, 54 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 228 hr, 30 minDec 218 hr, 30 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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.0h10.3h12.0h13.7h15.1h15.8h15.4h14.1h12.5h10.8h9.3h8.6h

The earliest sunrise is at 5:06 AM on June 15, and the latest sunrise is 2 hours, 42 minutes later at 7:48 AM on January 2. The earliest sunset is at 4:12 PM on December 10, and the latest sunset is 4 hours, 49 minutes later at 9:01 PM on June 25.

Daylight saving time (DST) is observed at Bowers Field during 2024, 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 at Bowers Field

Sunrise & Sunset with Twilight and Daylight Saving Time at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:06 AMJun 155:06 AM9:01 PMJun 259:01 PMJun 25Dec 104:12 PMDec 104:12 PM7:48 AMJan 27:48 AMJan 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth at Bowers Field

Solar Elevation and Azimuth at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0001010101020203030304040506000010101020202020303040405050602066NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. 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 at Bowers Field

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.

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 at Bowers Field, 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 at Bowers Field

Humidity Comfort Levels at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 310%Jan 310%Jul 140%Jul 140%NowNowdrydry
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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 at Bowers Field experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.8 months, from March 12 to September 5, with average wind speeds of more than 5.6 miles per hour. The windiest month of the year at Bowers Field is June, with an average hourly wind speed of 6.4 miles per hour.

The calmer time of year lasts for 6.2 months, from September 5 to March 12. The calmest month of the year at Bowers Field is December, with an average hourly wind speed of 4.9 miles per hour.

Average Wind Speed at Bowers Field

Average Wind Speed at Bowers FieldwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mphJul 176.5 mphJul 176.5 mphDec 204.8 mphDec 204.8 mphMar 125.6 mphMar 125.6 mphSep 55.6 mphSep 55.6 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 4.95.35.86.16.26.46.46.05.55.25.14.9

The predominant average hourly wind direction at Bowers Field is from the west throughout the year.

Wind Direction at Bowers Field

Wind Direction at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestnorthsoutheast
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).

To characterize how pleasant the weather is at Bowers Field 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 Bowers Field for general outdoor tourist activities is from early July to mid August, with a peak score in the last week of July.

Tourism Score at Bowers Field

Tourism Score at Bowers Fieldbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.27.20.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism 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 Bowers Field for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.

Beach/Pool Score at Bowers Field

Beach/Pool Score at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.04.00.00.0NowNowtemperaturetemperaturecloudscloudsprecipitationprecipitation
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.

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 at Bowers Field typically lasts for 5.6 months (170 days), from around April 24 to around October 11, rarely starting before April 2 or after May 14, and rarely ending before September 21 or after October 30.

Time Spent in Various Temperature Bands and the Growing Season at Bowers Field

Time Spent in Various Temperature Bands and the Growing Season at Bowers Fieldgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Apr 2450%Apr 2450%Oct 1150%Oct 1150%May 1490%May 1490%Sep 2190%Sep 2190%Apr 210%Apr 210%Oct 3010%Oct 3010%0%Feb 40%Feb 4Jul 19100%Jul 19100%NowNowfreezingvery coldcoldcoolcomfortablewarmhotfrigid
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 at Bowers Field should appear around April 18, only rarely appearing before April 3 or after May 5.

Growing Degree Days at Bowers Field

Growing Degree Days at Bowers FieldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FApr 1890°FApr 1890°FJul 6900°FJul 6900°FAug 201,800°FAug 201,800°FDec 312,466°FDec 312,466°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 3.2 months, from May 13 to August 19, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest month of the year at Bowers Field is July, with an average of 7.7 kWh.

The darker period of the year lasts for 3.7 months, from October 25 to February 17, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest month of the year at Bowers Field is December, with an average of 1.2 kWh.

Average Daily Incident Shortwave Solar Energy at Bowers Field

Average Daily Incident Shortwave Solar Energy at Bowers FieldbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 127.8 kWhJul 127.8 kWhDec 211.2 kWhDec 211.2 kWhMay 136.5 kWhMay 136.5 kWhAug 196.5 kWhAug 196.5 kWhOct 252.5 kWhOct 252.5 kWhFeb 172.5 kWhFeb 172.5 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.52.53.85.46.67.47.76.74.93.11.71.2

For the purposes of this report, the geographical coordinates of Bowers Field are 47.034 deg latitude, -120.531 deg longitude, and 1,749 ft elevation.

The topography within 2 miles of Bowers Field contains only modest variations in elevation, with a maximum elevation change of 325 feet and an average elevation above sea level of 1,745 feet. Within 10 miles contains only modest variations in elevation (3,294 feet). Within 50 miles also contains extreme variations in elevation (8,852 feet).

The area within 2 miles of Bowers Field is covered by cropland (83%) and grassland (11%), within 10 miles by shrubs (44%) and cropland (44%), and within 50 miles by shrubs (48%) and trees (25%).

This report illustrates the typical weather at Bowers Field, 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

Bowers Field has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Yakima Air Terminal Airport, Pangborn Field, Stampede Pass, Hanford, Ephrata Municipal Airport, Grant County International Airport, Tri-Cities Airport, and Renton Municipal Airport.

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 © OpenStreetMap contributors.

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.

Please review our full terms contained on our Terms of Service page.