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Average Weather in Troy Alabama, United States

In Troy, the summers are long, hot, and muggy; the winters are short and cold; and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 38°F to 90°F and is rarely below 24°F or above 96°F.

The hot season lasts for 4.1 months, from May 19 to September 23, with an average daily high temperature above 84°F. The hottest day of the year is July 23, with an average high of 90°F and low of 71°F.

The cool season lasts for 2.9 months, from November 30 to February 24, with an average daily high temperature below 65°F. The coldest day of the year is January 29, with an average low of 38°F and high of 59°F.

Average High and Low Temperature

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 in Troy12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillycoldcoolcomfortablewarmhot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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.

Clouds

In Troy, 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 in Troy begins around August 27 and lasts for 3.2 months, ending around December 3. On October 10, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 33% of the time.

The cloudier part of the year begins around December 3 and lasts for 8.8 months, ending around August 27. On July 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 51% of the time, and clear, mostly clear, or partly cloudy 49% of the time.

Cloud Cover

Cloud Cover in Troyclearercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 1251%Jul 1251%Oct 1033%Oct 1033%Aug 2742%Aug 2742%Dec 342%Dec 342%overcastmostly cloudypartly cloudymostly clearclear
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 in Troy varies significantly throughout the year.

The wetter season lasts 2.9 months, from June 1 to August 30, with a greater than 35% chance of a given day being a wet day. The chance of a wet day peaks at 51% on July 17.

The drier season lasts 9.0 months, from August 30 to June 1. The smallest chance of a wet day is 18% on October 16.

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 throughout the year is rain alone, with a peak probability of 51% on July 17.

Daily Chance of Precipitation

Daily Chance of Precipitation in Troywetdrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 1751%Jul 1751%Oct 1618%Oct 1618%Jan 128%Jan 128%Jun 135%Jun 135%Aug 3035%Aug 3035%mixedrain
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. Troy experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Troy. The most rain falls during the 31 days centered around March 9, with an average total accumulation of 5.3 inches.

The least rain falls around October 17, with an average total accumulation of 2.7 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.

Sun

The length of the day in Troy varies significantly over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 4 minutes of daylight; the longest day is June 21, with 14 hours, 14 minutes of daylight.

Hours of Daylight and Twilight

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 5:37 AM on June 11, and the latest sunrise is 1 hour, 25 minutes later at 7:02 AM on November 4. The earliest sunset is at 4:39 PM on December 3, and the latest sunset is 3 hours, 14 minutes later at 7:53 PM on June 29.

Daylight saving time (DST) is observed in Troy 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 in Troy12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 115:37 AMJun 115:37 AM7:53 PMJun 297:53 PMJun 29Dec 34:39 PMDec 34:39 PM7:02 AMNov 47:02 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
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.

Troy experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.0 months, from May 10 to October 10, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The muggiest day of the year is July 24, with muggy conditions 96% of the time.

The least muggy day of the year is January 31, with muggy conditions 1% of the time.

Humidity Comfort Levels

Humidity Comfort Levels in Troymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 311%Jan 311%96%Jul 2496%Jul 24May 1025%May 1025%Oct 1024%Oct 1024%oppressiveoppressivemuggymuggyhumidhumiddrydrymiserablemiserable
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 in Troy does not vary significantly over the course of the year, remaining within 0.5 miles per hour of 2.1 miles per hour throughout.

Average Wind Speed

Average Wind Speed in Troy0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mphJanFebMarAprMayJunJulAugSepOctNovDecFeb 262.6 mphFeb 262.6 mphAug 61.6 mphAug 61.6 mph
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 in Troy varies throughout the year.

The wind is most often from the south for 3.9 months, from February 25 to June 22, with a peak percentage of 37% on May 4. The wind is most often from the east for 3.0 months, from August 13 to November 14, with a peak percentage of 47% on September 9. The wind is most often from the north for 3.4 months, from November 14 to February 25, with a peak percentage of 32% on January 1.

Wind Direction

Wind Direction in TroyNSWEN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
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).

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.9 months, from April 7 to August 3, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is May 19, with an average of 6.8 kWh.

The darker period of the year lasts for 2.6 months, from November 15 to February 3, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest day of the year is December 23, with an average of 2.8 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Troybrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJanFebMarAprMayJunJulAugSepOctNovDecMay 196.8 kWhMay 196.8 kWhDec 232.8 kWhDec 232.8 kWhApr 76.0 kWhApr 76.0 kWhAug 36.0 kWhAug 36.0 kWhFeb 33.6 kWhFeb 33.6 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 Troy are 31.809 deg latitude, -85.970 deg longitude, and 463 ft elevation.

The topography within 2 miles of Troy contains only modest variations in elevation, with a maximum elevation change of 213 feet and an average elevation above sea level of 481 feet. Within 10 miles also contains only modest variations in elevation (322 feet). Within 50 miles contains only modest variations in elevation (607 feet).

The area within 2 miles of Troy is covered by artificial surfaces (43%), trees (33%), and cropland (22%), within 10 miles by trees (71%) and cropland (24%), and within 50 miles by trees (69%) and cropland (25%).

Data Sources

This report illustrates the typical weather in Troy, 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

There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Troy.

For each station, the records are corrected for the elevation difference between that station and Troy according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Troy is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Troy and a given station.

The stations contributing to this reconstruction are: Troy Municipal Airport (90%, 7 kilometers, northwest); Fort Rucker, Lowe Army Heliport (4.4%, 55 kilometers, south); Andalusia, Andalusia-Opp Municipal Airport (3.1%, 69 kilometers, southwest); and Weedon Field (2.4%, 81 kilometers, east).

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.