Average Weather at Robert (Bob) Curtis Memorial Airport Alaska, United States

1. World
2. United States
3. Alaska
4. Northwest Arctic Borough
5. Robert (Bob) Curtis Memorial Airport

At Robert (Bob) Curtis Memorial Airport, the summers are cool and mostly cloudy and the winters are long, frigid, snowy, windy, and partly cloudy. Over the course of the year, the temperature typically varies from -11°F to 66°F and is rarely below -37°F or above 76°F.

The warm season lasts for 3.3 months, from May 27 to September 6, with an average daily high temperature above 53°F. The hottest day of the year is July 2, with an average high of 66°F and low of 49°F.

The cold season lasts for 4.5 months, from November 7 to March 24, with an average daily high temperature below 17°F. The coldest day of the year is January 19, with an average low of -11°F and high of 5°F.

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.

On May 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 47% of the time, and overcast or mostly cloudy 53% of the time.

On December 17, the cloudiest day of the year, the sky is overcast or mostly cloudy 62% of the time, and clear, mostly clear, or partly cloudy 38% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Robert (Bob) Curtis Memorial Airport varies throughout the year.

The wetter season lasts 3.0 months, from July 3 to October 3, with a greater than 20% chance of a given day being a wet day. The chance of a wet day peaks at 33% on August 10.

The drier season lasts 9.0 months, from October 3 to July 3. The smallest chance of a wet day is 7% on March 19.

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 Robert (Bob) Curtis Memorial Airport changes throughout the year.

Rain alone is the most common for 6.0 months, from April 20 to October 20. The highest chance of a day with rain alone is 33% on August 10.

Snow alone is the most common for 5.9 months, from October 20 to April 18. The highest chance of a day with snow alone is 12% on December 31.

Mixed snow and rain is the most common for 2.0 days, from April 18 to April 20. The highest chance of a day with mixed snow and rain is 4% on October 7.

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. Robert (Bob) Curtis Memorial Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.7 months, from April 30 to October 22, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 13, with an average total accumulation of 2.6 inches.

The rainless period of the year lasts for 6.3 months, from October 22 to April 30. The least rain falls around March 12, with an average total accumulation of 0.1 inches.

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. Robert (Bob) Curtis Memorial Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.7 months, from September 21 to May 11, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around November 21, with an average total liquid-equivalent accumulation of 0.8 inches.

The snowless period of the year lasts for 4.3 months, from May 11 to September 21. The least snow falls around July 16, with an average total liquid-equivalent accumulation of 0.0 inches.

Due to its extreme latitude, Robert (Bob) Curtis Memorial Airport experiences polar day (also known as the midnight Sun) during the summer. 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 Robert (Bob) Curtis Memorial Airport during 2017, the Sun is continuously above the horizon for 1.2 months, rising at 3:03 AM on June 2, and not setting again until 2:37 AM on July 9.

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

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 Robert (Bob) Curtis Memorial 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.

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 Robert (Bob) Curtis Memorial Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from October 14 to April 11, with average wind speeds of more than 5.8 miles per hour. The windiest day of the year is January 9, with an average hourly wind speed of 7.7 miles per hour.

The calmer time of year lasts for 6.1 months, from April 11 to October 14. The calmest day of the year is June 21, with an average hourly wind speed of 3.9 miles per hour.

The predominant average hourly wind direction at Robert (Bob) Curtis Memorial Airport varies throughout the year.

The wind is most often from the west for 2.9 months, from May 23 to August 20, with a peak percentage of 46% on June 27. The wind is most often from the east for 9.1 months, from August 20 to May 23, with a peak percentage of 68% on January 1.

Robert (Bob) Curtis Memorial 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 1.6 months, from July 27 to September 15, with an average temperature above 45°F. The day of the year with the warmest water is August 19, with an average temperature of 50°F.

The time of year with cooler water lasts for 7.6 months, from October 23 to June 10, with an average temperature below 33°F. The day of the year with the coolest water is January 16, with an average temperature of 29°F.

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 2.8 months, from April 30 to July 24, with an average daily incident shortwave energy per square meter above 4.6 kWh. The brightest day of the year is June 17, with an average of 5.8 kWh.

The darker period of the year lasts for 4.8 months, from October 8 to March 2, with an average daily incident shortwave energy per square meter below 1.2 kWh. The darkest day of the year is December 22, with an average of 0.0 kWh.

For the purposes of this report, the geographical coordinates of Robert (Bob) Curtis Memorial Airport are 66.818 deg latitude, -161.030 deg longitude, and 49 ft elevation.

The topography within 2 miles of Robert (Bob) Curtis Memorial Airport contains only modest variations in elevation, with a maximum elevation change of 105 feet and an average elevation above sea level of 39 feet. Within 10 miles contains only modest variations in elevation (1,604 feet). Within 50 miles contains very significant variations in elevation (4,094 feet).

The area within 2 miles of Robert (Bob) Curtis Memorial Airport is covered by herbaceous vegetation (50%), shrubs (33%), and water (14%), within 10 miles by herbaceous vegetation (49%) and shrubs (41%), and within 50 miles by shrubs (40%) and water (29%).

This report illustrates the typical weather at Robert (Bob) Curtis Memorial 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

Robert (Bob) Curtis Memorial 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 Bob Baker Memorial Airport, Buckland Airport, Selawik Airport, Ralph Wien Memorial Airport, Deering Airport, Noatak Airport, Kivalina Airport, and Shungnak 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.