Climate and Average Weather Year Round at Allen Army Air Field United States

At Allen Army Air Field, the summers are comfortable and mostly cloudy and the winters are long, frigid, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from -6°F to 70°F and is rarely below -34°F or above 80°F.

Based on the tourism score, the best time of year to visit Allen Army Air Field for warm-weather activities is from late June to late July.

The warm season lasts for 3.7 months, from May 14 to September 6, with an average daily high temperature above 58°F. The hottest month of the year at Allen Army Air Field is July, with an average high of 70°F and low of 52°F.

The cold season lasts for 4.0 months, from November 2 to March 3, with an average daily high temperature below 20°F. The coldest month of the year at Allen Army Air Field is January, with an average low of -5°F and high of 9°F.

At Allen Army Air Field, 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 Allen Army Air Field begins around January 4 and lasts for 2.9 months, ending around March 31.

The clearest month of the year at Allen Army Air Field is March, during which on average the sky is clear, mostly clear, or partly cloudy 48% of the time.

The cloudier part of the year begins around March 31 and lasts for 9.1 months, ending around January 4.

The cloudiest month of the year at Allen Army Air Field is September, during which on average the sky is overcast or mostly cloudy 60% 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 Allen Army Air Field varies significantly throughout the year.

The wetter season lasts 3.6 months, from May 21 to September 10, with a greater than 19% chance of a given day being a wet day. The month with the most wet days at Allen Army Air Field is July, with an average of 9.9 days with at least 0.04 inches of precipitation.

The drier season lasts 8.4 months, from September 10 to May 21. The month with the fewest wet days at Allen Army Air Field is March, with an average of 1.0 days with at least 0.04 inches of precipitation.

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 Allen Army Air Field changes throughout the year.

Snow alone is the most common for 6.2 months, from October 11 to April 18. The month with the most days of snow alone at Allen Army Air Field is December, with an average of 1.8 days.

Rain alone is the most common for 5.8 months, from April 18 to October 11. The month with the most days of rain alone at Allen Army Air Field is July, with an average of 9.9 days.

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. Allen Army Air Field experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.2 months, from April 30 to October 6, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Allen Army Air Field is June, with an average rainfall of 2.8 inches.

The rainless period of the year lasts for 6.8 months, from October 6 to April 30. The month with the least rain at Allen Army Air Field is December, with an average rainfall of 0.0 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Allen Army Air Field experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 7.7 months, from September 13 to May 4, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Allen Army Air Field is October, with an average snowfall of 3.1 inches.

The snowless period of the year lasts for 4.3 months, from May 4 to September 13. The least snow falls around July 13, with an average total accumulation of 0.0 inches.

The length of the day at Allen Army Air Field varies extremely over the course of the year. In 2024, the shortest day is December 21, with 4 hours, 12 minutes of daylight; the longest day is June 20, with 21 hours, 1 minute of daylight.

The earliest sunrise is at 3:13 AM on June 19, and the latest sunrise is 7 hours, 22 minutes later at 10:35 AM on December 24. The earliest sunset is at 2:46 PM on December 17, and the latest sunset is 9 hours, 29 minutes later at 12:15 AM on June 21.

Daylight saving time (DST) is observed at Allen Army Air Field during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

The figure below presents a compact representation of key lunar data for 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.

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 Allen Army Air Field, 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 Allen Army Air Field experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.0 months, from November 11 to March 12, with average wind speeds of more than 6.9 miles per hour. The windiest month of the year at Allen Army Air Field is January, with an average hourly wind speed of 8.1 miles per hour.

The calmer time of year lasts for 8.0 months, from March 12 to November 11. The calmest month of the year at Allen Army Air Field is July, with an average hourly wind speed of 5.6 miles per hour.

The predominant average hourly wind direction at Allen Army Air Field varies throughout the year.

The wind is most often from the west for 2.6 months, from May 28 to August 15, with a peak percentage of 48% on July 17. The wind is most often from the south for 9.4 months, from August 15 to May 28, with a peak percentage of 76% on January 1.

To characterize how pleasant the weather is at Allen Army Air Field 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 Allen Army Air Field for general outdoor tourist activities is from late June to late July, with a peak score in the second week of July.

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 Allen Army Air Field for hot-weather activities is from late June to mid July, with a peak score in the first week of July.

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.

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 Allen Army Air Field typically lasts for 3.6 months (112 days), from around May 15 to around September 4, rarely starting before April 28 or after May 31, and rarely ending before August 17 or after September 23.

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.

Based on growing degree days alone, the first spring blooms at Allen Army Air Field should appear around May 25, only rarely appearing before May 15 or after June 6.

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 3.3 months, from April 28 to August 5, with an average daily incident shortwave energy per square meter above 4.6 kWh. The brightest month of the year at Allen Army Air Field is June, with an average of 5.7 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 1.2 kWh. The darkest month of the year at Allen Army Air Field is December, with an average of 0.1 kWh.

For the purposes of this report, the geographical coordinates of Allen Army Air Field are 63.994 deg latitude, -145.720 deg longitude, and 1,253 ft elevation.

The topography within 2 miles of Allen Army Air Field contains only modest variations in elevation, with a maximum elevation change of 171 feet and an average elevation above sea level of 1,245 feet. Within 10 miles contains only modest variations in elevation (1,014 feet). Within 50 miles contains very significant variations in elevation (13,074 feet).

The area within 2 miles of Allen Army Air Field is covered by trees (53%), sparse vegetation (27%), and bare soil (11%), within 10 miles by trees (60%) and cropland (12%), and within 50 miles by trees (46%) and shrubs (25%).