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April Weather at Spokane International Airport Washington, United States

Daily high temperatures increase by 9°F, from 54°F to 63°F, rarely falling below 45°F or exceeding 76°F.

Daily low temperatures increase by 6°F, from 35°F to 41°F, rarely falling below 28°F or exceeding 50°F.

For reference, on August 2, the hottest day of the year, temperatures at Spokane International Airport typically range from 59°F to 86°F, while on December 22, the coldest day of the year, they range from 23°F to 32°F.

Average High and Low Temperature in April at Spokane International Airport

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 at Spokane International Airport

Average Hourly Temperature in April at Spokane International AirportApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMayvery coldcoldcoolcomfortablefreezing
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.

Извор, Macedonia (5,753 miles away) is the far-away foreign place with temperatures most similar to Spokane International Airport (view comparison).

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The month of April at Spokane International Airport experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 62% to 52%.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 48% of the time.

For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 74%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.

Cloud Cover Categories in April at Spokane International Airport

Cloud Cover Categories in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 138%Apr 138%Apr 3048%Apr 3048%Apr 1141%Apr 1141%Apr 2144%Apr 2144%clearmostly 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. At Spokane International Airport, the chance of a wet day over the course of April is decreasing, starting the month at 24% and ending it at 19%.

For reference, the year's highest daily chance of a wet day is 36% on November 27, and its lowest chance is 7% on August 3.

Over the course of April at Spokane International Airport, the chance of a day with only rain decreases from 23% to 18%, 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 April at Spokane International Airport

Probability of Precipitation in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%MarMayApr 2618%Apr 2618%Apr 124%Apr 124%Apr 1122%Apr 1122%rainmixedsnow
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 at Spokane International Airport is essentially constant, remaining about 1.2 inches throughout, and rarely exceeding 2.1 inches or falling below 0.4 inches.

The lowest average 31-day accumulation is 1.1 inches on April 21.

Average Monthly Rainfall in April at Spokane International Airport

Average Monthly Rainfall in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inMarMayApr 211.1 inApr 211.1 inApr 11.3 inApr 11.3 inApr 301.1 inApr 301.1 inApr 111.2 inApr 111.2 in
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 at Spokane International Airport, 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, 35 minutes, implying an average daily increase of 3 minutes, 16 seconds, and weekly increase of 22 minutes, 53 seconds.

The shortest day of the month is April 1, with 12 hours, 54 minutes of daylight and the longest day is April 30, with 14 hours, 28 minutes of daylight.

Hours of Daylight and Twilight in April at Spokane International Airport

Hours of Daylight and Twilight in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrMarMaynightnightdaydayApr 112 hr, 54 minApr 112 hr, 54 minApr 3014 hr, 28 minApr 3014 hr, 28 minApr 1613 hr, 44 minApr 1613 hr, 44 min
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 at Spokane International Airport is 6:27 AM on April 1 and the earliest sunrise is 54 minutes earlier at 5:33 AM on April 30.

The earliest sunset is 7:21 PM on April 1 and the latest sunset is 41 minutes later at 8:01 PM on April 30.

Daylight saving time is observed at Spokane International Airport during 2024, but it neither starts nor ends during April, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 4:52 AM and sets 15 hours, 59 minutes later, at 8:51 PM, while on December 21, the shortest day of the year, it rises at 7:35 AM and sets 8 hours, 25 minutes later, at 4:01 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in April at Spokane International Airport

Sunrise & Sunset with Twilight and Daylight Saving Time in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMarMay5:33 AM5:33 AMApr 308:01 PMApr 308:01 PM6:27 AM6:27 AMApr 17:21 PMApr 17:21 PM6:07 AM6:07 AMApr 117:35 PMApr 117:35 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 at Spokane International Airport

Solar Elevation and Azimuth in April at Spokane International AirportApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMay001010202020303040405050600001010202030303040405060
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 at Spokane International Airport

Moon Rise, Set & Phases in April at Spokane International AirportApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AM7:34 AM7:34 AM7:37 PM7:37 PM6:48 PM6:48 PM6:56 AM6:56 AM6:12 AM6:12 AM7:55 PM7:55 PM8:00 PM8:00 PM5:49 AM5:49 AM4:54 AM4:54 AM8:16 PM8:16 PM8:11 PM8:11 PM4:41 AM4:41 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%2:50 AMSE10:15 AMSW-6:32 AMS237,457 mi
2
45%3:41 AMSE11:25 AMSW-7:33 AMS234,085 mi
3
34%4:22 AMSE12:45 PMSW-8:33 AMS230,726 mi
4
23%4:52 AMESE2:10 PMWSW-9:31 AMS227,645 mi
5
13%5:16 AMESE3:37 PMWSW-10:25 AMS225,145 mi
6
6%5:36 AMESE5:03 PMW-11:17 AMS223,515 mi
7
1%5:54 AME6:29 PMW-12:08 PMS222,981 mi
8
0%6:12 AME7:55 PMWNW-12:58 PMS223,656 mi
9
2%6:31 AMENE9:22 PMWNW-1:50 PMS225,509 mi
10
7%6:54 AMENE10:48 PMNW-2:44 PMS228,366 mi
11
14%7:23 AMNE--3:40 PMS231,944 mi
12
23%-12:10 AMNW8:01 AMNE4:38 PMS235,893 mi
13
32%-1:23 AMNW8:49 AMNE5:36 PMS239,859 mi
14
43%-2:21 AMNW9:49 AMNE6:31 PMS243,531 mi
15
50%-3:05 AMNW10:57 AMNE7:23 PMS246,672 mi
16
63%-3:38 AMNW12:07 PMNE8:11 PMS249,131 mi
17
72%-4:02 AMWNW1:18 PMENE8:55 PMS250,838 mi
18
80%-4:21 AMWNW2:26 PMENE9:36 PMS251,790 mi
19
87%-4:37 AMWNW3:33 PMENE10:15 PMS252,038 mi
20
93%-4:51 AMW4:38 PME10:53 PMS251,665 mi
21
97%-5:04 AMW5:44 PME11:32 PMS250,776 mi
22
99%-5:17 AMW6:51 PMESE--
23
100%-5:32 AMWSW8:00 PMESE12:12 AMS249,474 mi
24
100%-5:49 AMWSW9:12 PMESE12:55 AMS247,853 mi
25
98%-6:11 AMWSW10:26 PMSE1:42 AMS245,986 mi
26
94%-6:39 AMSW11:38 PMSE2:32 AMS243,926 mi
27
88%-7:17 AMSW-3:28 AMS241,705 mi
28
81%12:44 AMSE8:09 AMSW-4:26 AMS239,345 mi
29
71%1:39 AMSE9:14 AMSW-5:26 AMS236,877 mi
30
60%2:22 AMSE10:30 AMSW-6:26 AMS234,356 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 at Spokane International Airport is essentially constant during April, remaining around 0% throughout.

For reference, on July 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 April at Spokane International Airport

Humidity Comfort Levels in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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%drydry
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 at Spokane International Airport is essentially constant during April, remaining within 0.2 miles per hour of 7.2 miles per hour throughout.

For reference, on March 25, the windiest day of the year, the daily average wind speed is 7.5 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 6.1 miles per hour.

Average Wind Speed in April at Spokane International Airport

Average Wind Speed in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphMarMayApr 17.4 mphApr 17.4 mphApr 307.0 mphApr 307.0 mphApr 117.3 mphApr 117.3 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction at Spokane International Airport during April is predominantly out of the south from April 1 to April 11 and the west from April 11 to April 30.

Wind Direction in April at Spokane International Airport

Wind Direction in April at Spokane International AirportSWSApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%MarMaywestsoutheastnorth
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).

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 Spokane International Airport typically lasts for 5.4 months (165 days), from around April 29 to around October 11, rarely starting before April 9 or after May 17, and rarely ending before September 22 or after November 1.

During April at Spokane International Airport, the chance that a given day is within the growing season is rapidly increasing rising from 4% to 52% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in April at Spokane International Airport

Time Spent in Various Temperature Bands and the Growing Season in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 14%Apr 14%52%Apr 3052%Apr 30Apr 1113%Apr 1113%Apr 2129%Apr 2129%90%May 1790%May 17freezingvery coldcoldcoolwarm
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 at Spokane International Airport are gradually increasing during April, increasing by 77°F, from 20°F to 97°F, over the course of the month.

Growing Degree Days in April at Spokane International Airport

Growing Degree Days in April at Spokane International AirportApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303020°F20°F40°F40°F60°F60°F80°F80°F100°F100°F120°F120°F140°F140°F160°F160°FMarMayApr 120°FApr 120°FApr 3097°FApr 3097°FApr 1136°FApr 1136°FApr 2162°FApr 2162°F
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 at Spokane International Airport is rapidly increasing during April, rising by 1.5 kWh, from 4.3 kWh to 5.8 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April at Spokane International Airport

Average Daily Incident Shortwave Solar Energy in April at Spokane International AirportApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhMarMayApr 14.3 kWhApr 14.3 kWhApr 305.8 kWhApr 305.8 kWhApr 114.8 kWhApr 114.8 kWh
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 Spokane International Airport are 47.620 deg latitude, -117.534 deg longitude, and 2,356 ft elevation.

The topography within 2 miles of Spokane International Airport contains only modest variations in elevation, with a maximum elevation change of 171 feet and an average elevation above sea level of 2,362 feet. Within 10 miles contains only modest variations in elevation (1,542 feet). Within 50 miles contains very significant variations in elevation (4,573 feet).

The area within 2 miles of Spokane International Airport is covered by shrubs (47%) and grassland (43%), within 10 miles by shrubs (54%) and grassland (21%), and within 50 miles by shrubs (34%) and cropland (28%).

This report illustrates the typical weather at Spokane International Airport, 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

Spokane International Airport 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 Fairchild Air Force Base, Felts Field, Deer Park Airport, Coeur D'Alene Air Terminal, Pullman–Moscow Regional Airport, Sandpoint Airport, Lewiston–Nez Perce County Airport, and Walla Walla Regional 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.

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