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Average Weather at Cape Romanzof LRRS Airport Alaska, United States

At Cape Romanzof LRRS Airport, the summers are cold; the winters are long, frigid, and snowy; and it is windy and overcast year round. Over the course of the year, the temperature typically varies from 6°F to 55°F and is rarely below -13°F or above 65°F.

Climate Summary

freezingvery coldcoldvery coldfreezingJanFebMarAprMayJunJulAugSepOctNovDec38%38%18%18%overcastclearprecipitation: 2.8 inprecipitation: 2.8 in0.7 in0.7 inmuggy: 0%muggy: 0%drydrytourism score: 1.1tourism score: 1.10.00.0
Click on each chart for more information.

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

Temperature

The warm season lasts for 3.4 months, from June 3 to September 15, with an average daily high temperature above 47°F. The hottest day of the year is July 19, with an average high of 55°F and low of 47°F.

The cold season lasts for 4.3 months, from November 25 to April 4, with an average daily high temperature below 24°F. The coldest day of the year is January 20, with an average low of 6°F and high of 17°F.

Average High and Low Temperature

Average High and Low Temperature at Cape Romanzof LRRS AirportwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-20°F-10°F0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F100°FJan 2017°FJan 2017°FJul 1955°FJul 1955°F6°F6°F47°F47°FJun 347°FJun 347°FSep 1547°FSep 1547°FNov 2524°FNov 2524°FApr 424°FApr 424°F37°F37°F41°F41°F16°F16°F14°F14°FLowHigh
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 Cape Romanzof LRRS AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfrigidfreezingfreezingvery coldcoldvery coldfrigid
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.

Utsjoki, Finland (3,319 miles away) is the far-away foreign place with temperatures most similar to Cape Romanzof LRRS Airport (view comparison).

Clouds

At Cape Romanzof LRRS Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Cape Romanzof LRRS Airport begins around August 13 and lasts for 2.6 months, ending around November 1. On October 6, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 38% of the time, and overcast or mostly cloudy 62% of the time.

The cloudier part of the year begins around November 1 and lasts for 9.4 months, ending around August 13. On January 9, the cloudiest day of the year, the sky is overcast or mostly cloudy 82% of the time, and clear, mostly clear, or partly cloudy 18% of the time.

Cloud Cover Categories

Cloud Cover Categories at Cape Romanzof LRRS AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 638%Oct 638%Jan 918%Jan 918%Aug 1328%Aug 1328%Nov 128%Nov 128%clearmostly clearpartly cloudymostly cloudyovercast
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 Cape Romanzof LRRS Airport varies throughout the year.

The wetter season lasts 4.8 months, from July 1 to November 26, with a greater than 23% chance of a given day being a wet day. The chance of a wet day peaks at 35% on August 20.

The drier season lasts 7.2 months, from November 26 to July 1. The smallest chance of a wet day is 11% on March 25.

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 Cape Romanzof LRRS Airport changes throughout the year.

Rain alone is the most common for 6.2 months, from April 28 to November 2. The highest chance of a day with rain alone is 35% on August 20.

Snow alone is the most common for 5.8 months, from November 2 to April 28. The highest chance of a day with snow alone is 15% on January 13.

Daily Chance of Precipitation

Daily Chance of Precipitation at Cape Romanzof LRRS AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 2035%Aug 2035%Mar 2511%Mar 2511%Apr 2815%Apr 2815%Nov 222%Nov 222%Jan 121%Jan 121%Jul 123%Jul 123%snowrainmixed
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. Cape Romanzof LRRS Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.5 months, from May 5 to November 21, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 23, with an average total accumulation of 2.8 inches.

The rainless period of the year lasts for 5.5 months, from November 21 to May 5. The least rain falls around March 21, with an average total accumulation of 0.1 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. Cape Romanzof LRRS Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.8 months, from October 1 to May 26, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 4, with an average total liquid-equivalent accumulation of 0.9 inches.

The snowless period of the year lasts for 4.2 months, from May 26 to October 1. The least snow falls around August 1, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Cape Romanzof LRRS AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 inDec 40.9 inDec 40.9 inAug 10.0 inAug 10.0 inOct 10.1 inOct 10.1 inMay 260.1 inMay 260.1 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

The length of the day at Cape Romanzof LRRS Airport varies extremely over the course of the year. In 2017, the shortest day is December 21, with 5 hours, 14 minutes of daylight; the longest day is June 20, with 19 hours, 39 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Cape Romanzof LRRS AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 11 minMar 2012 hr, 11 minMar 2019 hr, 39 minJun 2019 hr, 39 minJun 2012 hr, 13 minSep 2212 hr, 13 minSep 225 hr, 14 minDec 215 hr, 14 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.

The earliest sunrise is at 5:16 AM on June 19, and the latest sunrise is 6 hours, 10 minutes later at 11:26 AM on December 25. The earliest sunset is at 4:38 PM on December 16, and the latest sunset is 8 hours, 17 minutes later at 12:55 AM on June 22.

Daylight saving time (DST) is observed at Cape Romanzof LRRS 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 Cape Romanzof LRRS AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMJun 195:16 AMJun 195:16 AM12:55 AMJun 2212:55 AMJun 22Dec 164:38 PMDec 164:38 PM11:26 AMDec 2511:26 AMDec 25Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 Cape Romanzof LRRS 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 Cape Romanzof LRRS AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 30%Jul 30%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 Cape Romanzof LRRS Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.4 months, from September 9 to April 21, with average wind speeds of more than 13.6 miles per hour. The windiest day of the year is February 11, with an average hourly wind speed of 17.2 miles per hour.

The calmer time of year lasts for 4.6 months, from April 21 to September 9. The calmest day of the year is June 30, with an average hourly wind speed of 9.9 miles per hour.

Average Wind Speed

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 Cape Romanzof LRRS Airport varies throughout the year.

The wind is most often from the north for 1.3 weeks, from January 11 to January 20; for 1.7 weeks, from February 4 to February 16; for 4.2 months, from February 22 to June 28; and for 3.7 months, from August 16 to December 8, with a peak percentage of 46% on April 20. The wind is most often from the east for 2.1 weeks, from January 20 to February 4; for 6.0 days, from February 16 to February 22; and for 1.1 months, from December 8 to January 11, with a peak percentage of 41% on January 27. The wind is most often from the south for 1.2 months, from June 28 to August 2 and for 2.0 days, from August 14 to August 16, with a peak percentage of 32% on July 6.

Wind Direction

Wind Direction at Cape Romanzof LRRS AirportEENNSWNEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
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

Cape Romanzof LRRS 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.4 months, from July 9 to September 21, with an average temperature above 47°F. The day of the year with the warmest water is August 17, with an average temperature of 52°F.

The time of year with cooler water lasts for 6.3 months, from November 11 to May 21, with an average temperature below 35°F. The day of the year with the coolest water is December 29, with an average temperature of 31°F.

Average Water Temperature

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 Cape Romanzof LRRS 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 Cape Romanzof LRRS 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 Cape Romanzof LRRS AirportJanFebMarAprMayJunJulAugSepOctNovDec02468101.11.10.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
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.

Beach/Pool Score

Beach/Pool Score at Cape Romanzof LRRS AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.00.00.00.0precipitationprecipitationcloudsclouds
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 Cape Romanzof LRRS Airport typically lasts for 3.9 months (121 days), from around June 1 to around September 30, rarely starting before May 13 or after June 19, and rarely ending before September 15 or after October 15.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Cape Romanzof LRRS Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 150%Jun 150%Sep 3050%Sep 3050%Jun 1990%Jun 1990%Sep 1590%Sep 1590%May 1310%May 1310%Oct 1510%Oct 1510%0%Feb 220%Feb 22Aug 2100%Aug 2100%frigidfreezingvery coldcoldcool
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 Cape Romanzof LRRS AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F50°F100°F150°F200°F250°FJul 2890°FJul 2890°FDec 31156°FDec 31156°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 3.0 months, from April 21 to July 21, with an average daily incident shortwave energy per square meter above 4.1 kWh. The brightest day of the year is June 4, with an average of 5.2 kWh.

The darker period of the year lasts for 4.2 months, from October 15 to February 22, with an average daily incident shortwave energy per square meter below 1.1 kWh. The darkest day of the year is December 21, with an average of 0.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Cape Romanzof LRRS AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJun 45.2 kWhJun 45.2 kWhDec 210.1 kWhDec 210.1 kWhApr 214.1 kWhApr 214.1 kWhJul 214.1 kWhJul 214.1 kWhOct 151.1 kWhOct 151.1 kWhFeb 221.1 kWhFeb 221.1 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.

Topography

For the purposes of this report, the geographical coordinates of Cape Romanzof LRRS Airport are 61.780 deg latitude, -166.039 deg longitude, and 653 ft elevation.

The topography within 2 miles of Cape Romanzof LRRS Airport contains large variations in elevation, with a maximum elevation change of 2,047 feet and an average elevation above sea level of 679 feet. Within 10 miles also contains large variations in elevation (2,283 feet). Within 50 miles also contains large variations in elevation (2,359 feet).

The area within 2 miles of Cape Romanzof LRRS Airport is covered by shrubs (59%), water (17%), and sparse vegetation (15%), within 10 miles by water (74%) and shrubs (16%), and within 50 miles by water (69%) and herbaceous vegetation (15%).

Data Sources

This report illustrates the typical weather at Cape Romanzof LRRS 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

Cape Romanzof LRRS 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 Hooper Bay Airport, Scammon Bay Airport, Chevak Airport, Mekoryuk Airport, Toksook Bay Airport, Emmonak Airport, Mountain Village Airport, and St. Mary's 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.