Climate and Average Weather Year Round at Mount Sterling-Montgomery County Airport United States

At Mount Sterling-Montgomery County Airport, the summers are warm and muggy, the winters are very cold and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 27°F to 85°F and is rarely below 10°F or above 91°F.

Based on the tourism score, the best time of year to visit Mount Sterling-Montgomery County Airport for warm-weather activities is from mid June to late September.

The warm season lasts for 3.8 months, from May 25 to September 18, with an average daily high temperature above 76°F. The hottest month of the year at Mount Sterling-Montgomery County Airport is July, with an average high of 84°F and low of 66°F.

The cold season lasts for 3.0 months, from November 27 to February 28, with an average daily high temperature below 50°F. The coldest month of the year at Mount Sterling-Montgomery County Airport is January, with an average low of 27°F and high of 42°F.

At Mount Sterling-Montgomery County 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 Mount Sterling-Montgomery County Airport begins around June 13 and lasts for 4.9 months, ending around November 8.

The clearest month of the year at Mount Sterling-Montgomery County Airport is September, during which on average the sky is clear, mostly clear, or partly cloudy 67% of the time.

The cloudier part of the year begins around November 8 and lasts for 7.1 months, ending around June 13.

The cloudiest month of the year at Mount Sterling-Montgomery County Airport is January, 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 Mount Sterling-Montgomery County Airport varies throughout the year.

The wetter season lasts 5.0 months, from March 20 to August 19, with a greater than 33% chance of a given day being a wet day. The month with the most wet days at Mount Sterling-Montgomery County Airport is May, with an average of 12.7 days with at least 0.04 inches of precipitation.

The drier season lasts 7.0 months, from August 19 to March 20. The month with the fewest wet days at Mount Sterling-Montgomery County Airport is October, with an average of 7.8 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 at Mount Sterling-Montgomery County Airport is May, with an average of 12.7 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 42% on May 10.

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. Mount Sterling-Montgomery County Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Mount Sterling-Montgomery County Airport. The month with the most rain at Mount Sterling-Montgomery County Airport is May, with an average rainfall of 4.2 inches.

The month with the least rain at Mount Sterling-Montgomery County Airport is January, with an average rainfall of 2.4 inches.

Snowfall

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

The snowy period of the year lasts for 3.8 months, from November 28 to March 23, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Mount Sterling-Montgomery County Airport is February, with an average snowfall of 3.3 inches.

The snowless period of the year lasts for 8.2 months, from March 23 to November 28. The least snow falls around July 17, with an average total accumulation of 0.0 inches.

The length of the day at Mount Sterling-Montgomery County Airport varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 31 minutes of daylight; the longest day is June 20, with 14 hours, 49 minutes of daylight.

The earliest sunrise is at 6:12 AM on June 12, and the latest sunrise is 1 hour, 51 minutes later at 8:03 AM on November 2. The earliest sunset is at 5:15 PM on December 5, and the latest sunset is 3 hours, 47 minutes later at 9:02 PM on June 27.

Daylight saving time (DST) is observed at Mount Sterling-Montgomery County Airport 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.

Mount Sterling-Montgomery County Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.1 months, from May 21 to September 23, during which time the comfort level is muggy, oppressive, or miserable at least 17% of the time. The month with the most muggy days at Mount Sterling-Montgomery County Airport is July, with 20.1 days that are muggy or worse.

The least muggy day of the year is January 27, when muggy conditions are essentially unheard of.

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 Mount Sterling-Montgomery County Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from October 27 to May 10, with average wind speeds of more than 6.3 miles per hour. The windiest month of the year at Mount Sterling-Montgomery County Airport is February, with an average hourly wind speed of 7.9 miles per hour.

The calmer time of year lasts for 5.5 months, from May 10 to October 27. The calmest month of the year at Mount Sterling-Montgomery County Airport is August, with an average hourly wind speed of 4.8 miles per hour.

The predominant average hourly wind direction at Mount Sterling-Montgomery County Airport varies throughout the year.

The wind is most often from the south for 4.1 weeks, from May 9 to June 7 and for 3.4 months, from August 26 to December 7, with a peak percentage of 38% on November 18. The wind is most often from the west for 2.6 months, from June 7 to August 26 and for 5.1 months, from December 7 to May 9, with a peak percentage of 43% on July 12.

To characterize how pleasant the weather is at Mount Sterling-Montgomery County 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 Mount Sterling-Montgomery County Airport for general outdoor tourist activities is from mid June to late September, with a peak score in the last week of August.

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 Mount Sterling-Montgomery County Airport for hot-weather activities is from late June to late August, with a peak score in the last 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 Mount Sterling-Montgomery County Airport typically lasts for 6.4 months (194 days), from around April 11 to around October 22, rarely starting before March 24 or after May 3, and rarely ending before October 2 or after November 9.

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 Mount Sterling-Montgomery County Airport should appear around March 14, only rarely appearing before February 27 or after April 1.

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 4.3 months, from April 23 to September 3, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest month of the year at Mount Sterling-Montgomery County Airport is July, with an average of 6.6 kWh.

The darker period of the year lasts for 3.0 months, from November 8 to February 10, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest month of the year at Mount Sterling-Montgomery County Airport is December, with an average of 2.0 kWh.