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April Weather in Polson Montana, United States

Daily high temperatures increase by 9°F, from 52°F to 62°F, rarely falling below 42°F or exceeding 75°F.

Daily low temperatures increase by 7°F, from 33°F to 39°F, rarely falling below 26°F or exceeding 48°F.

For reference, on July 30, the hottest day of the year, temperatures in Polson typically range from 56°F to 85°F, while on December 31, the coldest day of the year, they range from 19°F to 30°F.

Average High and Low Temperature in April in Polson

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 Polson

Average Hourly Temperature in April in PolsonApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMayNowNowfreezingvery 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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Detva, Slovakia (5,235 miles away) is the far-away foreign place with temperatures most similar to Polson (view comparison).

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The month of April in Polson experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 62% to 55%.

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 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on July 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.

Cloud Cover Categories in April in Polson

Cloud Cover Categories in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 3046%Apr 3046%Apr 1141%Apr 1141%Apr 2143%Apr 2143%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 Polson, the chance of a wet day over the course of April is essentially constant, remaining around 25% throughout.

For reference, the year's highest daily chance of a wet day is 37% on June 3, and its lowest chance is 13% on July 25.

Over the course of April in Polson, the chance of a day with only rain remains an essentially constant 24% throughout, 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 in Polson

Probability of Precipitation in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%MarMayApr 126%Apr 126%Apr 3025%Apr 3025%Apr 1126%Apr 1126%Apr 2125%Apr 2125%NowNowsnowmixedrain
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 Polson is essentially constant, remaining about 1.5 inches throughout, and rarely exceeding 2.6 inches or falling below 0.5 inches.

Average Monthly Rainfall in April in Polson

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 Polson, 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, 17 seconds, and weekly increase of 22 minutes, 57 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, 29 minutes of daylight.

Hours of Daylight and Twilight in April in Polson

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 Polson is 7:13 AM on April 1 and the earliest sunrise is 54 minutes earlier at 6:19 AM on April 30.

The earliest sunset is 8:07 PM on April 1 and the latest sunset is 41 minutes later at 8:48 PM on April 30.

Daylight saving time is observed in Polson 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 5:38 AM and sets 16 hours, 0 minutes later, at 9:38 PM, while on December 21, the shortest day of the year, it rises at 8:22 AM and sets 8 hours, 25 minutes later, at 4:47 PM.

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

Sunrise & Sunset with Twilight and Daylight Saving Time in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMarMay6:19 AM6:19 AMApr 308:48 PMApr 308:48 PM7:13 AM7:13 AMApr 18:07 PMApr 18:07 PM6:54 AM6:54 AMApr 118:21 PMApr 118:21 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 Polson

Solar Elevation and Azimuth in April in PolsonApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 Polson

Moon Rise, Set & Phases in April in PolsonApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayMar 103:01 AMMar 103:01 AMMar 251:01 AMMar 251:01 AMApr 812:22 PMApr 812:22 PMApr 235:50 PMApr 235:50 PMMay 79:23 PMMay 79:23 PMMay 237:54 AMMay 237:54 AM8:20 AM8:20 AM8:23 PM8:23 PM7:34 PM7:34 PM7:42 AM7:42 AM6:58 AM6:58 AM8:41 PM8:41 PM8:46 PM8:46 PM6:35 AM6:35 AM5:40 AM5:40 AM9:02 PM9:02 PM8:58 PM8:58 PM5:27 AM5:27 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%3:36 AMSE11:00 AMSW-7:18 AMS237,488 mi
2
45%4:28 AMSE12:10 PMSW-8:19 AMS234,117 mi
3
34%5:08 AMSE1:30 PMSW-9:19 AMS230,756 mi
4
23%5:39 AMESE2:56 PMWSW-10:17 AMS227,672 mi
5
13%6:02 AMESE4:22 PMWSW-11:11 AMS225,165 mi
6
6%6:22 AMESE5:49 PMW-12:03 PMS223,526 mi
7
1%6:40 AME7:14 PMW-12:54 PMS222,981 mi
8
0%6:58 AME8:41 PMWNW-1:45 PMS223,644 mi
9
2%7:17 AMENE10:08 PMWNW-2:36 PMS225,486 mi
10
7%7:40 AMENE11:34 PMNW-3:30 PMS228,336 mi
11
14%8:09 AMNE--4:26 PMS231,908 mi
12
22%-12:56 AMNW8:46 AMNE5:24 PMS235,855 mi
13
32%-2:09 AMNW9:35 AMNE6:22 PMS239,823 mi
14
43%-3:08 AMNW10:35 AMNE7:17 PMS243,499 mi
15
50%-3:52 AMNW11:42 AMNE8:09 PMS246,646 mi
16
63%-4:25 AMNW12:53 PMNE8:57 PMS249,112 mi
17
72%-4:49 AMWNW2:03 PMENE9:41 PMS250,826 mi
18
80%-5:08 AMWNW3:12 PMENE10:22 PMS251,785 mi
19
87%-5:23 AMWNW4:18 PMENE11:01 PMS252,038 mi
20
93%-5:37 AMW5:24 PME11:40 PMS251,672 mi
21
95%-5:50 AMW6:30 PME--
22
97%-6:03 AMW7:37 PMESE12:18 AMS250,787 mi
23
100%-6:18 AMWSW8:46 PMESE12:59 AMS249,488 mi
24
100%-6:35 AMWSW9:58 PMESE1:41 AMS247,869 mi
25
98%-6:57 AMWSW11:12 PMSE2:28 AMS246,005 mi
26
94%-7:25 AMSW-3:18 AMS243,946 mi
27
89%12:24 AMSE8:03 AMSW-4:14 AMS241,726 mi
28
81%1:30 AMSE8:54 AMSW-5:12 AMS239,367 mi
29
71%2:25 AMSE9:59 AMSW-6:12 AMS236,900 mi
30
61%3:08 AMSE11:16 AMSW-7:12 AMS234,379 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 Polson is essentially constant during April, remaining around 0% throughout.

For reference, on July 15, 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 Polson

Humidity Comfort Levels in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 in Polson is essentially constant during April, remaining within 0.1 miles per hour of 5.1 miles per hour throughout.

For reference, on April 18, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.

The highest daily average wind speed during April is 5.1 miles per hour on April 18.

Average Wind Speed in April in Polson

Average Wind Speed in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphMarMayApr 185.1 mphApr 185.1 mphApr 15.0 mphApr 15.0 mphApr 305.0 mphApr 305.0 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Polson throughout April is predominantly from the west, with a peak proportion of 52% on April 21.

Wind Direction in April in Polson

Wind Direction in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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).

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 Polson typically lasts for 4.9 months (150 days), from around May 4 to around October 2, rarely starting before April 16 or after May 21, and rarely ending before September 15 or after October 17.

The month of April in Polson is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 2% to 37% over the course of the month.

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

Time Spent in Various Temperature Bands and the Growing Season in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 12%Apr 12%Apr 3037%Apr 3037%Apr 116%Apr 116%Apr 2117%Apr 2117%50%May 450%May 490%May 2190%May 21freezingvery coldcoldcoolfrigidwarm
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 Polson are gradually increasing during April, increasing by 64°F, from 14°F to 78°F, over the course of the month.

Growing Degree Days in April in Polson

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 Polson is increasing during April, rising by 1.3 kWh, from 4.5 kWh to 5.8 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April in Polson

Average Daily Incident Shortwave Solar Energy in April in PolsonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhMarMayApr 14.5 kWhApr 14.5 kWhApr 305.8 kWhApr 305.8 kWhApr 115.0 kWhApr 115.0 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 Polson are 47.694 deg latitude, -114.163 deg longitude, and 2,923 ft elevation.

The topography within 2 miles of Polson contains significant variations in elevation, with a maximum elevation change of 528 feet and an average elevation above sea level of 2,999 feet. Within 10 miles contains significant variations in elevation (5,049 feet). Within 50 miles also contains extreme variations in elevation (7,320 feet).

The area within 2 miles of Polson is covered by sparse vegetation (33%), water (31%), and grassland (15%), within 10 miles by sparse vegetation (32%) and water (18%), and within 50 miles by trees (42%) and sparse vegetation (26%).

This report illustrates the typical weather in Polson, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Polson.

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

The stations contributing to this reconstruction are:

Sources mapKGPI, 50%42 mi, 33 ftKMSO, 35%54 mi, 266 ftKMLP, 16%71 mi, 3,104 ft© OpenStreetMap contributors

To get a sense of how much these sources agree with each other, you can view a comparison of Polson 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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