Average Weather in Troy Michigan, United States
In Troy, the summers are warm, the winters are freezing and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 20°F to 84°F and is rarely below 6°F or above 92°F.
Based on the tourism score, the best time of year to visit Troy for warm-weather activities is from mid June to mid September.
The warm season lasts for 3.7 months, from May 26 to September 17, with an average daily high temperature above 73°F. The hottest day of the year is July 19, with an average high of 84°F and low of 66°F.
The cold season lasts for 3.4 months, from November 30 to March 11, with an average daily high temperature below 43°F. The coldest day of the year is January 29, with an average low of 20°F and high of 32°F.
Average High and Low Temperature
Average Hourly Temperature
In Troy, 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 Troy begins around June 1 and lasts for 5.0 months, ending around November 1. On August 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 November 1 and lasts for 7.0 months, ending around June 1. On January 10, the cloudiest day of the year, the sky is overcast or mostly cloudy 64% of the time, and clear, mostly clear, or partly cloudy 36% of the time.
Cloud Cover Categories
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 throughout the year.
The wetter season lasts 6.3 months, from March 29 to October 8, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 35% on June 13.
The drier season lasts 5.7 months, from October 8 to March 29. The smallest chance of a wet day is 16% on February 2.
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 35% on June 13.
Daily Chance of Precipitation
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 September 11, with an average total accumulation of 2.8 inches.
The least rain falls around January 29, with an average total accumulation of 0.7 inches.
Average Monthly Rainfall
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Troy experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.4 months, from November 24 to April 5, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 11, with an average total liquid-equivalent accumulation of 0.5 inches.
The snowless period of the year lasts for 7.6 months, from April 5 to November 24. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Troy varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 3 minutes of daylight; the longest day is June 21, with 15 hours, 19 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:54 AM on June 15, and the latest sunrise is 2 hours, 15 minutes later at 8:08 AM on November 3. The earliest sunset is at 4:59 PM on December 9, and the latest sunset is 4 hours, 15 minutes later at 9:14 PM on June 27.
Daylight saving time (DST) is observed in Troy during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
Troy experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.7 months, from June 1 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 7% of the time. The muggiest day of the year is August 1, with muggy conditions 28% of the time.
The least muggy day of the year is December 9, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Troy experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.2 months, from October 6 to May 11, with average wind speeds of more than 10.6 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 13.3 miles per hour.
The calmer time of year lasts for 4.8 months, from May 11 to October 6. The calmest day of the year is August 4, with an average hourly wind speed of 8.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Troy varies throughout the year.
The wind is most often from the south for 4.1 weeks, from August 21 to September 19, with a peak percentage of 31% on September 14. The wind is most often from the west for 11 months, from September 19 to August 21, with a peak percentage of 46% on January 1.
Troy 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 extreme seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.0 months, from June 23 to September 24, with an average temperature above 66°F. The day of the year with the warmest water is August 4, with an average temperature of 74°F.
The time of year with cooler water lasts for 4.2 months, from December 10 to April 17, with an average temperature below 41°F. The day of the year with the coolest water is February 14, with an average temperature of 33°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Troy 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 Troy for general outdoor tourist activities is from mid June to mid September, with a peak score in the third 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 Troy for hot-weather activities is from early July to mid August, with a peak score in the third week of July.
The growing season in Troy typically lasts for 6.4 months (195 days), from around April 19 to around October 31, rarely starting before April 3 or after May 4, and rarely ending before October 13 or after November 17.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Troy should appear around April 17, only rarely appearing before April 3 or after April 30.
Growing Degree Days
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 3.6 months, from May 3 to August 21, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is July 1, with an average of 7.0 kWh.
The darker period of the year lasts for 3.4 months, from November 2 to February 13, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest day of the year is December 20, with an average of 1.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Troy are 42.606 deg latitude, -83.150 deg longitude, and 741 ft elevation.
The topography within 2 miles of Troy contains only modest variations in elevation, with a maximum elevation change of 187 feet and an average elevation above sea level of 742 feet. Within 10 miles contains only modest variations in elevation (577 feet). Within 50 miles also contains significant variations in elevation (797 feet).
The area within 2 miles of Troy is covered by artificial surfaces (99%), within 10 miles by artificial surfaces (94%), and within 50 miles by cropland (43%) and artificial surfaces (23%).
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 3 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: Oakland-Troy Airport (76%, 7 kilometers, south); Oakland County International Airport (13%, 23 kilometers, west); and Selfridge Air National Guard Base (11%, 27 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .