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May Weather at Ugnu-Kuparuk Airport Alaska, United States

Daily high temperatures increase by 19°F, from 20°F to 38°F, rarely falling below 9°F or exceeding 49°F.

Daily low temperatures increase by 20°F, from 8°F to 28°F, rarely falling below -5°F or exceeding 34°F.

For reference, on July 13, the hottest day of the year, temperatures at Ugnu-Kuparuk Airport typically range from 40°F to 55°F, while on February 9, the coldest day of the year, they range from -22°F to -9°F.

Average High and Low Temperature in May at Ugnu-Kuparuk Airport

Average High and Low Temperature in May at Ugnu-Kuparuk AirportMay1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131-40°F-40°F-30°F-30°F-20°F-20°F-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°FAprJunMay 120°FMay 120°F8°F8°FMay 3138°FMay 3138°F28°F28°FMay 1126°FMay 1126°F15°F15°FMay 2132°FMay 2132°F22°F22°F
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 May. 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 May at Ugnu-Kuparuk Airport

Average Hourly Temperature in May at Ugnu-Kuparuk AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJunfrigidfreezingvery coldcold
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.

Tosontsengel, Mongolia (3,552 miles away) and McMurdo Station, Antarctica (10,402 miles) are the far-away foreign places with temperatures most similar to Ugnu-Kuparuk Airport (view comparison).

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The month of May at Ugnu-Kuparuk Airport experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 76% to 67%.

The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 33% of the time.

For reference, on January 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 91%, while on June 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 36%.

Cloud Cover Categories in May at Ugnu-Kuparuk Airport

Cloud Cover Categories in May at Ugnu-Kuparuk AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 124%May 124%May 3133%May 3133%May 1128%May 1128%May 2130%May 2130%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 Ugnu-Kuparuk Airport, the chance of a wet day over the course of May is increasing, starting the month at 3% and ending it at 9%.

For reference, the year's highest daily chance of a wet day is 22% on August 11, and its lowest chance is 2% on April 1.

Over the course of May at Ugnu-Kuparuk Airport, the chance of a day with only rain increases from 0% to 5%, 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 3% throughout.

Probability of Precipitation in May at Ugnu-Kuparuk Airport

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 May at Ugnu-Kuparuk Airport is gradually increasing, starting the month at 0.0 inches, when it rarely exceeds 0.1 inches or falls below -0.0 inches, and ending the month at 0.3 inches, when it rarely exceeds 0.8 inches.

Average Monthly Rainfall in May at Ugnu-Kuparuk Airport

Average Monthly Rainfall in May at Ugnu-Kuparuk AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.2 in0.2 in0.4 in0.4 in0.6 in0.6 in0.8 in0.8 in1.0 in1.0 in1.2 in1.2 in1.4 in1.4 in1.6 in1.6 inAprJunMay 10.0 inMay 10.0 inMay 310.3 inMay 310.3 inMay 110.1 inMay 110.1 inMay 210.2 inMay 210.2 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.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during May at Ugnu-Kuparuk Airport is essentially constant, remaining about 1.4 inches throughout, and rarely exceeding 4.7 inches or falling to 0.0 inches.

The highest average 31-day accumulation is 1.6 inches on May 20.

Average Monthly Snowfall in May at Ugnu-Kuparuk Airport

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.

Due to its extreme latitude, Ugnu-Kuparuk Airport experiences polar day (also known as the midnight Sun) during the summer and polar night during the winter. These are periods of time in which the sun is continuously above or below the horizon for more than one day. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.

In the summer at Ugnu-Kuparuk Airport during 2024, the Sun is continuously above the horizon for 2.4 months, rising at 2:06 AM on May 14, and not setting again until 1:58 AM on July 28. As such, polar day begins in May and lasts beyond the end of the month.

The shortest day of the month is May 1, with 19 hours, 19 minutes of daylight.

Hours of Daylight and Twilight in May at Ugnu-Kuparuk Airport

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 Ugnu-Kuparuk Airport is 4:18 AM on May 1 and the earliest sunrise is 2 hours, 12 minutes earlier at 2:06 AM on May 14.

The earliest sunset is 11:37 PM on May 1 and the latest sunset is 2 hours, 5 minutes later at 1:42 AM on May 13.

Daylight saving time is observed at Ugnu-Kuparuk Airport during 2024, but it neither starts nor ends during May, so the entire month is in standard time.

Sunrise & Sunset with Twilight in May at Ugnu-Kuparuk Airport

Sunrise & Sunset with Twilight in May at Ugnu-Kuparuk AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMAprJun2:06 AM2:06 AM1:42 AMMay 131:42 AMMay 134:18 AM4:18 AM11:37 PMMay 111:37 PMMay 1SolarMidnightSolarMidnightSolarNoon
The solar day over the course of May. 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 May at Ugnu-Kuparuk Airport

Solar Elevation and Azimuth in May at Ugnu-Kuparuk AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJun01010202020303040010102020303040
northeastsouthwest
Solar elevation and azimuth over the course of May 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 May 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 May at Ugnu-Kuparuk Airport

Moon Rise, Set & Phases in May at Ugnu-Kuparuk AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 810:22 AMApr 810:22 AMApr 233:50 PMApr 233:50 PMMay 77:23 PMMay 77:23 PMJun 64:38 AMJun 64:38 AM6:33 AM6:33 AM10:43 PM10:43 PM11:45 PM11:45 PM4:17 AM4:17 AM3:37 AM3:37 AM12:00 AM12:00 AM12:00 AM12:00 AM12:00 AM12:00 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.
May 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%8:42 AMS231,652 mi
2
36%6:51 AMSE12:23 PMSW-9:36 AMS229,377 mi
3
25%6:04 AMESE2:57 PMWSW-10:28 AMS227,485 mi
4
15%5:31 AME5:17 PMW-11:17 AMS226,182 mi
5
7%5:00 AME7:38 PMWNW-12:06 PMS225,663 mi
6
2%4:27 AMENE10:18 PMNW-12:56 PMS226,067 mi
7
0%3:37 AMNNE--1:47 PMS227,443 mi
8
1%2:41 PMS229,727 mi
9
5%3:38 PMS232,742 mi
10
11%4:35 PMS236,221 mi
11
18%5:31 PMS239,853 mi
12
27%6:23 PMS243,327 mi
13
37%7:12 PMS246,376 mi
14
47%7:57 PMS248,797 mi
15
50%-6:04 AMNNW11:10 AMNE8:39 PMS250,460 mi
16
66%-5:21 AMNW1:19 PMENE9:18 PMS251,310 mi
17
75%-4:51 AMWNW3:13 PMENE9:57 PMS251,355 mi
18
83%-4:25 AMW5:02 PME10:35 PMS250,665 mi
19
90%-4:00 AMWSW6:55 PMESE11:15 PMS249,352 mi
20
95%-3:31 AMWSW9:02 PMSE11:57 PMS247,556 mi
21
97%-2:52 AMSW---
22
99%12:44 AMS245,435 mi
23
100%1:35 AMS243,141 mi
24
99%2:31 AMS240,813 mi
25
96%3:32 AMS238,563 mi
26
90%4:35 AMS236,464 mi
27
83%5:38 AMS234,561 mi
28
73%6:37 AMS232,872 mi
29
62%5:22 AMSSE9:43 AMSSW-7:32 AMS231,411 mi
30
50%4:27 AMSE12:24 PMWSW-8:24 AMS230,205 mi
31
39%3:52 AMESE2:42 PMW-9:12 AMS229,309 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 Ugnu-Kuparuk Airport is essentially constant during May, remaining around 0% throughout.

For reference, on July 24, 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 May at Ugnu-Kuparuk Airport

Humidity Comfort Levels in May at Ugnu-Kuparuk AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AprJunMay 10%May 10%May 310%May 310%May 110%May 110%May 210%May 210%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 Ugnu-Kuparuk Airport is gradually decreasing during May, decreasing from 11.6 miles per hour to 10.9 miles per hour over the course of the month.

For reference, on January 12, the windiest day of the year, the daily average wind speed is 13.0 miles per hour, while on July 11, the calmest day of the year, the daily average wind speed is 9.7 miles per hour.

Average Wind Speed in May at Ugnu-Kuparuk Airport

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 at Ugnu-Kuparuk Airport throughout May is predominantly from the east, with a peak proportion of 62% on May 30.

Wind Direction in May at Ugnu-Kuparuk Airport

Wind Direction in May at Ugnu-Kuparuk AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunwesteastnorthsouth
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).

Ugnu-Kuparuk Airport 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 at Ugnu-Kuparuk Airport is essentially constant during May, remaining around 29°F throughout.

Average Water Temperature in May at Ugnu-Kuparuk Airport

Average Water Temperature in May at Ugnu-Kuparuk AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313128°F28°F29°F29°F30°F30°F31°F31°F32°F32°F33°F33°F34°F34°F35°F35°FAprJunMay 129°FMay 129°FMay 3130°FMay 3130°FMay 1129°FMay 1129°FMay 2129°FMay 2129°F
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 at Ugnu-Kuparuk Airport typically lasts for 1.6 months (48 days), from around June 27 to around August 14, rarely starting before June 7, or ending after September 5.

The month of May at Ugnu-Kuparuk Airport is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in May at Ugnu-Kuparuk Airport

Time Spent in Various Temperature Bands and the Growing Season in May at Ugnu-Kuparuk AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 10%May 10%May 313%May 313%May 110%May 110%May 210%May 210%50%Jun 2750%Jun 27Jun 710%Jun 710%frigidfreezingvery 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 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 Ugnu-Kuparuk Airport are essentially constant during May, remaining around 0°F throughout.

Growing Degree Days in May at Ugnu-Kuparuk Airport

The average growing degree days accumulated over the course of May, 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 Ugnu-Kuparuk Airport is increasing during May, rising by 1.2 kWh, from 4.5 kWh to 5.6 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in May at Ugnu-Kuparuk Airport

Average Daily Incident Shortwave Solar Energy in May at Ugnu-Kuparuk AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAprJunMay 14.5 kWhMay 14.5 kWhMay 315.6 kWhMay 315.6 kWhMay 115.0 kWhMay 115.0 kWhMay 215.3 kWhMay 215.3 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.

This report illustrates the typical weather at Ugnu-Kuparuk 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

Ugnu-Kuparuk 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 are Deadhorse Airport and Nuiqsut 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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