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Average Weather at Ugnu-Kuparuk Airport Alaska, United States

At Ugnu-Kuparuk Airport, the summers are cold; the winters are long, frigid, and windy; and it is dry and overcast year round. Over the course of the year, the temperature typically varies from -22°F to 55°F and is rarely below -41°F or above 69°F.

Climate Summary

frigidcoldcoldfreezingfrigidJanFebMarAprMayJunJulAugSepOctNovDec36%36%9%9%overcastclearprecipitation: 1.2 inprecipitation: 1.2 in0.1 in0.1 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 0.8tourism score: 0.80.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Ugnu-Kuparuk Airport for warm-weather activities is from early July to early August.

Temperature

The warm season lasts for 3.0 months, from June 8 to September 7, with an average daily high temperature above 42°F. The hottest day of the year is July 14, with an average high of 55°F and low of 40°F.

The cold season lasts for 4.6 months, from November 20 to April 7, with an average daily high temperature below 4°F. The coldest day of the year is February 9, with an average low of -22°F and high of -9°F.

Average High and Low Temperature

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 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

Average Hourly Temperature at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfrigidfrigidvery coldcoldfreezingfreezingcold
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Terskol, Russia (4,570 miles away); Tosontsengel, Mongolia (3,552 miles); and McMurdo Station, Antarctica (10,402 miles) are the far-away foreign places with temperatures most similar to Ugnu-Kuparuk Airport (view comparison).

Clouds

At Ugnu-Kuparuk Airport, 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 Ugnu-Kuparuk Airport begins around April 28 and lasts for 5.6 months, ending around October 15. On June 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 36% of the time, and overcast or mostly cloudy 64% of the time.

The cloudier part of the year begins around October 15 and lasts for 6.4 months, ending around April 28. On January 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 91% of the time, and clear, mostly clear, or partly cloudy 9% of the time.

Cloud Cover Categories

Cloud Cover Categories at Ugnu-Kuparuk AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 2736%Jun 2736%Jan 219%Jan 219%Apr 2822%Apr 2822%Oct 1523%Oct 1523%clearpartly cloudymostly cloudyovercastmostly clear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 2.7 months, from July 1 to September 21, with a greater than 12% chance of a given day being a wet day. The chance of a wet day peaks at 22% on August 12.

The drier season lasts 9.4 months, from September 21 to July 1. The smallest chance of a wet day is 2% on April 1.

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 Ugnu-Kuparuk Airport changes throughout the year.

Snow alone is the most common for 8.0 months, from September 24 to May 24. The highest chance of a day with snow alone is 6% on October 5.

Rain alone is the most common for 4.0 months, from May 24 to September 24. The highest chance of a day with rain alone is 22% on August 12.

Daily Chance of Precipitation

Daily Chance of Precipitation at Ugnu-Kuparuk AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 1222%Aug 1222%Apr 12%Apr 12%May 248%May 248%Sep 2411%Sep 2411%Jan 14%Jan 14%Jul 112%Jul 112%rainsnow
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 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. Ugnu-Kuparuk Airport experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 3.0 months, from June 14 to September 16, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 10, with an average total accumulation of 1.1 inches.

The rainless period of the year lasts for 9.0 months, from September 16 to June 14. The least rain falls around March 21, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Ugnu-Kuparuk Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 9.2 months, from September 3 to June 10, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around October 5, with an average total liquid-equivalent accumulation of 0.3 inches.

The snowless period of the year lasts for 2.8 months, from June 10 to September 3. The least snow falls around July 15, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Ugnu-Kuparuk AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.2 in0.4 in0.6 in0.8 in1.0 in1.2 inOct 50.3 inOct 50.3 inJul 150.0 inJul 150.0 inMay 210.2 inMay 210.2 inDec 200.1 inDec 200.1 inSep 30.1 inSep 30.1 in
The average liquid-equivalent 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.

Sun

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 2017, the Sun is continuously above the horizon for 2.5 months, rising at 2:18 AM on May 14, and not setting again until 1:33 AM on July 29.

In the winter at Ugnu-Kuparuk Airport during 2017, the Sun is continuously below the horizon for 1.9 months, setting at 1:16 PM on November 22, and not rising again until 12:40 PM on January 18.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Ugnu-Kuparuk Airportpolar dayJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 15 minMar 2012 hr, 15 minMar 2024 hr, 0 minJun 2024 hr, 0 minJun 2012 hr, 19 minSep 2212 hr, 19 minSep 220 minDec 210 minDec 21nightnightday
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.

Daylight saving time (DST) is observed at Ugnu-Kuparuk Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMMay 142:18 AMMay 142:18 AM1:33 AMJul 281:33 AMJul 281:16 PMNov 221:16 PMNov 22Jan 1812:40 PMJan 1812:40 PMMar 12DSTMar 12DSTdaynightnightnightnightSolarMidnightSolarMidnightSolarNoon
The solar day over the course of the year 2017. 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.

Humidity

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 Ugnu-Kuparuk Airport, 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

Humidity Comfort Levels at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 180%Jan 180%Jul 270%Jul 270%drydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 8.0 months, from September 15 to May 13, with average wind speeds of more than 11.3 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 13.0 miles per hour.

The calmer time of year lasts for 4.0 months, from May 13 to September 15. The calmest day of the year is July 12, with an average hourly wind speed of 9.7 miles per hour.

Average Wind Speed

Average Wind Speed at Ugnu-Kuparuk AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mphJan 1213.0 mphJan 1213.0 mphJul 129.7 mphJul 129.7 mphSep 1511.3 mphSep 1511.3 mphMay 1311.3 mphMay 1311.3 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Ugnu-Kuparuk Airport is from the east throughout the year.

Wind Direction

Wind Direction at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westeastnorthsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 1.7 months, from July 20 to September 11, with an average temperature above 34°F. The day of the year with the warmest water is August 15, with an average temperature of 36°F.

The time of year with cooler water lasts for 7.5 months, from October 23 to June 7, with an average temperature below 30°F. The day of the year with the coolest water is February 9, with an average temperature of 29°F.

Average Water Temperature

Average Water Temperature at Ugnu-Kuparuk AirportwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec28°F30°F32°F34°F36°F38°F40°FAug 1536°FAug 1536°F29°FFeb 929°FFeb 9Oct 2330°FOct 2330°FJun 730°FJun 730°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

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

Tourism Score

Tourism Score at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.80.80.00.0precipitationprecipitationcloudscloudstemperaturetemperature
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 Ugnu-Kuparuk Airport for hot-weather activities is from mid to late July, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.10.10.00.0precipitationprecipitationcloudsclouds
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.

Growing Season

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 28 to around August 15, rarely starting before June 8, or ending after September 6.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 2850%Jun 2850%Aug 1550%Aug 1550%Jun 810%Jun 810%Sep 610%Sep 610%0%Nov 160%Nov 16Jul 2377%Jul 2377%frigidvery coldcoldfreezingcomfortable
The percentage of time spent in various temperature bands: 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 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.

Growing Degree Days

Growing Degree Days at Ugnu-Kuparuk AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F50°F100°F150°F200°FAug 390°FAug 390°FDec 31126°FDec 31126°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 2.5 months, from May 6 to July 22, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest day of the year is June 19, with an average of 5.8 kWh.

The darker period of the year lasts for 5.5 months, from September 28 to March 13, with an average daily incident shortwave energy per square meter below 1.2 kWh. The darkest day of the year is January 1, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Ugnu-Kuparuk AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJun 195.8 kWhJun 195.8 kWhJan 10.0 kWhJan 10.0 kWhMay 64.7 kWhMay 64.7 kWhJul 224.7 kWhJul 224.7 kWhSep 281.2 kWhSep 281.2 kWhMar 131.2 kWhMar 131.2 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.

Data Sources

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 Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.