Climate and Average Weather Year Round in Afton United States

In Afton, the summers are hot, muggy, and wet; the winters are very cold and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 28°F to 92°F and is rarely below 13°F or above 100°F.

Based on the beach/pool score, the best time of year to visit Afton for hot-weather activities is from mid June to early September.

The hot season lasts for 3.3 months, from June 4 to September 14, with an average daily high temperature above 83°F. The hottest month of the year in Afton is July, with an average high of 92°F and low of 71°F.

The cold season lasts for 3.0 months, from November 26 to February 24, with an average daily high temperature below 56°F. The coldest month of the year in Afton is January, with an average low of 28°F and high of 47°F.

In Afton, 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 in Afton begins around June 9 and lasts for 4.8 months, ending around November 2.

The clearest month of the year in Afton is August, during which on average the sky is clear, mostly clear, or partly cloudy 71% of the time.

The cloudier part of the year begins around November 2 and lasts for 7.2 months, ending around June 9.

The cloudiest month of the year in Afton is February, during which on average the sky is overcast or mostly cloudy 48% 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 in Afton varies significantly throughout the year.

The wetter season lasts 5.7 months, from March 25 to September 16, with a greater than 29% chance of a given day being a wet day. The month with the most wet days in Afton is May, with an average of 13.0 days with at least 0.04 inches of precipitation.

The drier season lasts 6.3 months, from September 16 to March 25. The month with the fewest wet days in Afton is January, with an average of 4.4 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. The month with the most days of rain alone in Afton is May, with an average of 13.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 45% on May 20.

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. Afton experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Afton. The month with the most rain in Afton is May, with an average rainfall of 5.2 inches.

The month with the least rain in Afton is January, with an average rainfall of 1.4 inches.

Snowfall

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

The snowy period of the year lasts for 3.3 months, from November 24 to March 1, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Afton is January, with an average snowfall of 2.4 inches.

The snowless period of the year lasts for 8.7 months, from March 1 to November 24. The least snow falls around July 17, with an average total accumulation of 0.0 inches.

The length of the day in Afton varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 39 minutes of daylight; the longest day is June 20, with 14 hours, 41 minutes of daylight.

The earliest sunrise is at 6:00 AM on June 12, and the latest sunrise is 1 hour, 45 minutes later at 7:45 AM on November 2. The earliest sunset is at 5:03 PM on December 5, and the latest sunset is 3 hours, 39 minutes later at 8:42 PM on June 27.

Daylight saving time (DST) is observed in Afton 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.

Afton experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.5 months, from May 11 to September 28, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The month with the most muggy days in Afton is July, with 25.2 days that are muggy or worse.

The month with the fewest muggy days in Afton is January, with 0.0 days that are muggy or worse.

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 in Afton experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.1 months, from October 15 to May 20, with average wind speeds of more than 8.9 miles per hour. The windiest month of the year in Afton is March, with an average hourly wind speed of 10.8 miles per hour.

The calmer time of year lasts for 4.9 months, from May 20 to October 15. The calmest month of the year in Afton is August, with an average hourly wind speed of 7.1 miles per hour.

The predominant average hourly wind direction in Afton is from the south throughout the year.

To characterize how pleasant the weather is in Afton 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 Afton for general outdoor tourist activities is from early May to early October, with a peak score in the second week of September.

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 Afton for hot-weather activities is from mid June to early September, 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 in Afton typically lasts for 7.0 months (214 days), from around March 30 to around October 30, rarely starting before March 8 or after April 19, and rarely ending before October 11 or after November 19.

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 in Afton should appear around February 25, only rarely appearing before February 9 or after March 14.

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.0 months, from April 27 to August 27, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Afton is July, with an average of 6.9 kWh.

The darker period of the year lasts for 3.1 months, from November 5 to February 8, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest month of the year in Afton is December, with an average of 2.4 kWh.

For the purposes of this report, the geographical coordinates of Afton are 36.694 deg latitude, -94.963 deg longitude, and 787 ft elevation.

The topography within 2 miles of Afton is essentially flat, with a maximum elevation change of 62 feet and an average elevation above sea level of 790 feet. Within 10 miles is essentially flat (335 feet). Within 50 miles contains only modest variations in elevation (932 feet).

The area within 2 miles of Afton is covered by cropland (98%), within 10 miles by cropland (80%), and within 50 miles by cropland (64%) and trees (28%).