Average Weather at Mackinac Island Airport Michigan, United States
Mackinac Island Airport has a humid continental climate with warm summers and no dry season. The temperature typically varies from 12°F to 76°F over the course of the year, and is rarely below -5°F or above 84°F.
The warm season lasts for 110 days, from May 30 to September 17, with an average daily high temperature above 65°F. The hottest day of the year is July 25, with an average high of 76°F and low of 59°F.
The cold season lasts for 103 days, from December 2 to March 15, with an average daily high temperature below 35°F. The coldest day of the year is January 30, with an average low of 12°F and high of 25°F.
Average High and Low Temperature
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
The length of the day at Mackinac Island Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 39 minutes of daylight; the longest day is June 21, with 15 hours, 44 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:47 AM on June 15, and the latest sunrise is 2 hours, 36 minutes later at 8:23 AM on November 4. The earliest sunset is at 4:53 PM on December 10, and the latest sunset is 4 hours, 39 minutes later at 9:32 PM on June 25.
Daylight saving time (DST) is observed at Mackinac Island Airport during 2017, starting in the spring on March 12, lasting 237 days, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
At Mackinac Island 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 Mackinac Island Airport begins around May 26 and lasts for 155 days, ending around October 28. On August 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
The cloudier part of the year begins around October 28 and lasts for 210 days, ending around May 26. On January 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 71% of the time, and clear, mostly clear, or partly cloudy 28% 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 Mackinac Island Airport varies throughout the year.
The wetter season lasts 252 days, from April 5 to December 13, with a greater than 24% chance of a given day being a wet day. The chance of a wet day peaks at 35% on September 23.
The drier season lasts 113 days, from December 13 to April 5. The smallest chance of a wet day is 13% on February 19.
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 Mackinac Island Airport changes throughout the year.
Rain alone is the most common for 271 days, from March 14 to December 10. The highest chance of a day with rain alone is 35% on September 23.
Snow alone is the most common for 94 days, from December 10 to March 14. The highest chance of a day with snow alone is 14% on January 3.
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 in the year. Mackinac Island Airport experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 298 days, from March 6 to December 29, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 24, with an average total accumulation of 3.1 inches.
The rainless period of the year lasts for 67 days, from December 29 to March 6. The least rain falls around February 4, with and average total accumulation of 0.2 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day in the year. Mackinac Island Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 182 days, from October 31 to May 1, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 4, with an average total liquid-equivalent accumulation of 0.8 inches.
The snowless period of the year lasts for 183 days, from May 1 to October 31. The least snow falls around July 24, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
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.
Mackinac Island Airport experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 92 days, from June 18 to September 18, during which time the comfort level is muggy, oppressive, or miserable at least 4% of the time. The muggiest day of the year is July 30, with muggy conditions 16% of the time.
The least muggy day of the year is December 3, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
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 Mackinac Island Airport experiences mildly seasonal variation over the course of the year.
The windier part of the year lasts for 193 days, from October 4 to April 15, with average wind speeds of more than 5.3 miles per hour. The windiest day of the year is January 4, with an average hourly wind speed of 6.8 miles per hour.
The calmer time of year lasts for 172 days, from April 15 to October 4. The calmest day of the year is July 24, with an average hourly wind speed of 3.8 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Mackinac Island Airport varies throughout the year.
The wind is most often from the north for 55 days, from February 28 to April 24, with a peak percentage of 33% on March 10. The wind is most often from the east for 5 days, from April 24 to April 29, with a peak percentage of 28% on April 27. The wind is most often from the west for 305 days, from April 29 to February 28, with a peak percentage of 43% on July 18.
Mackinac Island Airport 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 significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 76 days, from July 9 to September 23, with an average temperature above 59°F. The day of the year with the warmest water is August 12, with an average temperature of 66°F.
The time of year with cooler water lasts for 154 days, from December 11 to May 14, with an average temperature below 40°F. The day of the year with the coolest water is March 7, with an average temperature of 34°F.
Average Water Temperature
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 very significant seasonal variation over the course of the year.
The brighter period of the year lasts for 108 days, from May 5 to August 21, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is July 1, with an average of 6.9 kWh.
The darker period of the year lasts for 111 days, from October 28 to February 16, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest day of the year is December 23, with an average of 1.1 kWh.
Average Daily Incident Shortwave Solar Energy
The area within 2 miles of Mackinac Island Airport is covered by water (72%), trees (14%), and herbaceous vegetation (11%), within 10 miles by water (76%) and herbaceous vegetation (11%), and within 50 miles by water (45%) and trees (32%).
The topography within 2 miles of Mackinac Island Airport contains only modest variations in elevation, with a maximum elevation change of 318 feet, and an average elevation above sea level of 615 feet. Within 10 miles also contains only modest variations in elevation (318 feet). Within 50 miles contains very significant variations in elevation (974 feet).
This report illustrates the typical weather at Mackinac Island Airport, 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
Mackinac Island Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Cheboygan, Cheboygan County Airport, Pellston Regional Airport of Emmet County, Chippewa County International Airport, Harbor Springs Airport, Sault Ste. Marie Airport, Sault Ste Marie Municipal Airport, Charlevoix Municipal Airport, and Gaylord Regional Airport.
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 .