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April Weather in Coupeville Washington, United States

Daily high temperatures increase by 5°F, from 55°F to 60°F, rarely falling below 48°F or exceeding 69°F.

Daily low temperatures increase by 4°F, from 42°F to 46°F, rarely falling below 37°F or exceeding 51°F.

For reference, on August 2, the hottest day of the year, temperatures in Coupeville typically range from 55°F to 73°F, while on December 30, the coldest day of the year, they range from 38°F to 45°F.

Average High and Low Temperature in April in Coupeville

Average High and Low Temperature in April in CoupevilleApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303030°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°FMarMayApr 155°FApr 155°F42°F42°FApr 3060°FApr 3060°F46°F46°FApr 1157°FApr 1157°F43°F43°FApr 2158°FApr 2158°F45°F45°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 hourly average temperatures for the quarter of the year centered on April. 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 April in Coupeville

Average Hourly Temperature in April in CoupevilleApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMayNowNowvery coldvery coldcoldcool
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.

Saint-Lô, France (4,870 miles away) is the far-away foreign place with temperatures most similar to Coupeville (view comparison).

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The month of April in Coupeville experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 64% to 54%.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 46% of the time.

For reference, on January 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.

Cloud Cover Categories in April in Coupeville

Cloud Cover Categories in April in CoupevilleApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 136%Apr 136%Apr 3046%Apr 3046%Apr 1138%Apr 1138%Apr 2142%Apr 2142%NowNowclearmostly clearpartly cloudymostly cloudyovercast
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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Coupeville, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 42% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 57% on November 17, and its lowest chance is 8% on July 30.

Probability of Precipitation in April in Coupeville

Probability of Precipitation in April in CoupevilleApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%MarMayApr 142%Apr 142%Apr 3029%Apr 3029%Apr 1137%Apr 1137%Apr 2133%Apr 2133%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 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 April in Coupeville is rapidly decreasing, starting the month at 3.3 inches, when it rarely exceeds 5.1 inches or falls below 1.7 inches, and ending the month at 2.0 inches, when it rarely exceeds 3.5 inches or falls below 0.7 inches.

Average Monthly Rainfall in April in Coupeville

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.

Over the course of April in Coupeville, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 37 minutes, implying an average daily increase of 3 minutes, 20 seconds, and weekly increase of 23 minutes, 23 seconds.

The shortest day of the month is April 1, with 12 hours, 55 minutes of daylight and the longest day is April 30, with 14 hours, 32 minutes of daylight.

Hours of Daylight and Twilight in April in Coupeville

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 latest sunrise of the month in Coupeville is 6:47 AM on April 1 and the earliest sunrise is 55 minutes earlier at 5:52 AM on April 30.

The earliest sunset is 7:42 PM on April 1 and the latest sunset is 42 minutes later at 8:24 PM on April 30.

Daylight saving time is observed in Coupeville during 2024, but it neither starts nor ends during April, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:10 AM and sets 16 hours, 5 minutes later, at 9:15 PM, while on December 21, the shortest day of the year, it rises at 7:59 AM and sets 8 hours, 20 minutes later, at 4:19 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in April in Coupeville

Sunrise & Sunset with Twilight and Daylight Saving Time in April in CoupevilleApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMarMay5:52 AM5:52 AMApr 308:24 PMApr 308:24 PM6:47 AM6:47 AMApr 17:42 PMApr 17:42 PM6:27 AM6:27 AMApr 117:56 PMApr 117:56 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of April. 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 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 in April in Coupeville

Solar Elevation and Azimuth in April in CoupevilleApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMay001010202020303040405050600001010202030303040405060NowNow
northeastsouthwest
Solar elevation and azimuth over the course of April 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 April 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in April in Coupeville

Moon Rise, Set & Phases in April in CoupevilleApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayMar 101:01 AMMar 101:01 AMMar 2512:01 AMMar 2512:01 AMApr 811:22 AMApr 811:22 AMApr 234:50 PMApr 234:50 PMMay 78:23 PMMay 78:23 PMMay 236:54 AMMay 236:54 AM7:55 AM7:55 AM7:59 PM7:59 PM7:10 PM7:10 PM7:16 AM7:16 AM6:32 AM6:32 AM8:18 PM8:18 PM8:24 PM8:24 PM6:08 AM6:08 AM5:13 AM5:13 AM8:40 PM8:40 PM8:36 PM8:36 PM4:59 AM4:59 AM
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.
Apr 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%3:15 AMSE10:32 AMSW-6:53 AMS237,409 mi
2
45%4:06 AMSE11:43 AMSW-7:55 AMS234,036 mi
3
33%4:46 AMSE1:04 PMSW-8:55 AMS230,679 mi
4
23%5:15 AMESE2:30 PMWSW-9:52 AMS227,604 mi
5
13%5:38 AMESE3:57 PMWSW-10:47 AMS225,115 mi
6
6%5:57 AMESE5:24 PMW-11:39 AMS223,499 mi
7
1%6:15 AME6:51 PMW-12:29 PMS222,982 mi
8
0%6:32 AME8:18 PMWNW-1:20 PMS223,674 mi
9
2%6:51 AMENE9:46 PMWNW-2:12 PMS225,543 mi
10
7%7:13 AMENE11:13 PMNW-3:06 PMS228,413 mi
11
14%7:41 AMNE--4:02 PMS231,999 mi
12
23%-12:35 AMNW8:18 AMNE5:00 PMS235,950 mi
13
33%-1:48 AMNW9:07 AMNE5:57 PMS239,914 mi
14
43%-2:46 AMNW10:07 AMNE6:53 PMS243,580 mi
15
50%-3:30 AMNW11:15 AMNE7:44 PMS246,712 mi
16
63%-4:02 AMNW12:26 PMNE8:32 PMS249,161 mi
17
72%-4:25 AMWNW1:37 PMENE9:16 PMS250,857 mi
18
81%-4:44 AMWNW2:46 PMENE9:57 PMS251,798 mi
19
88%-4:59 AMWNW3:53 PMENE10:36 PMS252,036 mi
20
93%-5:12 AMW5:00 PME11:15 PMS251,656 mi
21
97%-5:24 AMW6:06 PME11:53 PMS250,760 mi
22
99%-5:37 AMW7:14 PMESE--
23
100%-5:51 AMWSW8:24 PMESE12:34 AMS249,453 mi
24
100%-6:08 AMWSW9:36 PMESE1:16 AMS247,828 mi
25
98%-6:29 AMSW10:50 PMSE2:03 AMS245,958 mi
26
94%-6:57 AMSW-2:54 AMS243,895 mi
27
88%12:03 AMSE7:35 AMSW-3:49 AMS241,672 mi
28
81%1:09 AMSE8:26 AMSW-4:48 AMS239,310 mi
29
71%2:04 AMSE9:32 AMSW-5:48 AMS236,841 mi
30
60%2:46 AMSE10:49 AMSW-6:47 AMS234,320 mi

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 Coupeville is essentially constant during April, remaining around 0% throughout.

For reference, on August 1, 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 April in Coupeville

Humidity Comfort Levels in April in CoupevilleApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%MarMayApr 160%Apr 160%Apr 10%Apr 10%Apr 300%Apr 300%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.

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 Coupeville is gradually decreasing during April, decreasing from 4.8 miles per hour to 4.1 miles per hour over the course of the month.

For reference, on December 3, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 3.0 miles per hour.

Average Wind Speed in April in Coupeville

Average Wind Speed in April in CoupevilleApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphMarMayApr 14.8 mphApr 14.8 mphApr 304.1 mphApr 304.1 mphApr 114.6 mphApr 114.6 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Coupeville during April is predominantly out of the south from April 1 to April 22 and the west from April 22 to April 30.

Wind Direction in April in Coupeville

Wind Direction in April in CoupevilleSWApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%MarMayNowNowwestsoutheastnorth
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).

Coupeville 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 Coupeville is gradually increasing during April, rising by 2°F, from 47°F to 49°F, over the course of the month.

Average Water Temperature in April in Coupeville

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Coupeville typically lasts for 8.8 months (267 days), from around February 26 to around November 20, rarely starting after April 11, or ending before October 15.

The month of April in Coupeville is more likely than not fully within the growing season, with the chance that a given day is in the growing season increasing from 82% to 98% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in April in Coupeville

Time Spent in Various Temperature Bands and the Growing Season in April in Coupevillegrowing seasonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMay82%Apr 182%Apr 198%Apr 3098%Apr 3090%Apr 1190%Apr 1195%Apr 2195%Apr 21NowNowvery coldcoldcoolcomfortable
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.

The average accumulated growing degree days in Coupeville are gradually increasing during April, increasing by 66°F, from 39°F to 105°F, over the course of the month.

Growing Degree Days in April in Coupeville

Growing Degree Days in April in CoupevilleApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303020°F20°F40°F40°F60°F60°F80°F80°F100°F100°F120°F120°F140°F140°F160°F160°FMarMayApr 139°FApr 139°FApr 30105°FApr 30105°FApr 1155°FApr 1155°FApr 2177°FApr 2177°FNowNow
The average growing degree days accumulated over the course of April, 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 in Coupeville is increasing during April, rising by 1.5 kWh, from 3.8 kWh to 5.3 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April in Coupeville

Average Daily Incident Shortwave Solar Energy in April in CoupevilleApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhMarMayApr 13.8 kWhApr 13.8 kWhApr 305.3 kWhApr 305.3 kWhApr 114.3 kWhApr 114.3 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.

For the purposes of this report, the geographical coordinates of Coupeville are 48.220 deg latitude, -122.686 deg longitude, and 75 ft elevation.

The topography within 2 miles of Coupeville contains only modest variations in elevation, with a maximum elevation change of 217 feet and an average elevation above sea level of 78 feet. Within 10 miles contains only modest variations in elevation (591 feet). Within 50 miles contains significant variations in elevation (7,720 feet).

The area within 2 miles of Coupeville is covered by water (42%), cropland (21%), artificial surfaces (14%), and trees (12%), within 10 miles by water (64%) and trees (14%), and within 50 miles by trees (41%) and water (33%).

This report illustrates the typical weather in Coupeville, 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 Coupeville.

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

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Coupeville and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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.

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