Average Weather in Walpole Island Canada
In Walpole Island, the summers are warm; the winters are freezing, dry, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 19°F to 81°F and is rarely below 4°F or above 89°F.
Based on the tourism score, the best time of year to visit Walpole Island for warm-weather activities is from mid June to early September.
The warm season lasts for 3.7 months, from May 27 to September 18, with an average daily high temperature above 71°F. The hottest day of the year is July 19, with an average high of 81°F and low of 63°F.
The cold season lasts for 3.3 months, from December 2 to March 12, with an average daily high temperature below 41°F. The coldest day of the year is January 29, with an average low of 19°F and high of 31°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
In Walpole Island, 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 Walpole Island begins around May 30 and lasts for 5.1 months, ending around November 3. 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 3 and lasts for 6.9 months, ending around May 30. 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 Walpole Island varies throughout the year.
The wetter season lasts 6.3 months, from March 30 to October 7, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 36% on June 13.
The drier season lasts 5.7 months, from October 7 to March 30. The smallest chance of a wet day is 15% 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 in Walpole Island changes throughout the year.
Rain alone is the most common for 12 months, from February 3 to February 5 and from February 5 to January 22. The highest chance of a day with rain alone is 36% on June 13.
Snow alone is the most common for 1.7 weeks, from January 22 to February 3. The highest chance of a day with snow alone is 9% on January 7.
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. Walpole Island experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Walpole Island. The most rain falls during the 31 days centered around September 11, with an average total accumulation of 2.5 inches.
The least rain falls around January 29, with an average total accumulation of 0.6 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 of the year. Walpole Island experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.4 months, from November 23 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 5, 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 23. The least snow falls around July 19, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Walpole Island 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 5:51 AM on June 15, and the latest sunrise is 2 hours, 15 minutes later at 8:06 AM on November 3. The earliest sunset is at 4:56 PM on December 9, and the latest sunset is 4 hours, 15 minutes later at 9:11 PM on June 27.
Daylight saving time (DST) is observed in Walpole Island 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
Walpole Island experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.6 months, from June 4 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The muggiest day of the year is August 1, with muggy conditions 35% of the time.
The least muggy day of the year is February 24, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Walpole Island experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.0 months, from October 6 to May 8, with average wind speeds of more than 11.1 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 13.9 miles per hour.
The calmer time of year lasts for 5.0 months, from May 8 to October 6. The calmest day of the year is August 4, with an average hourly wind speed of 8.2 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Walpole Island varies throughout the year.
The wind is most often from the north for 2.9 months, from March 9 to June 5, with a peak percentage of 31% on March 11. The wind is most often from the south for 2.0 days, from June 5 to June 7 and for 1.6 months, from August 14 to October 3, with a peak percentage of 32% on September 14. The wind is most often from the west for 2.2 months, from June 7 to August 14 and for 5.2 months, from October 3 to March 9, with a peak percentage of 36% on July 20.
Walpole Island 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 3.0 months, from June 24 to September 25, with an average temperature above 65°F. The day of the year with the warmest water is August 4, with an average temperature of 73°F.
The time of year with cooler water lasts for 4.2 months, from December 12 to April 19, 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 Walpole Island 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 Walpole Island for general outdoor tourist activities is from mid June to early September, with a peak score in the second 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 Walpole Island for hot-weather activities is from early July to mid August, with a peak score in the third week of July.
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.
The growing season in Walpole Island typically lasts for 5.8 months (177 days), from around April 27 to around October 21, rarely starting before April 10 or after May 14, and rarely ending before October 1 or after November 10.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Walpole Island should appear around April 25, only rarely appearing before April 12 or after May 8.
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 2 to August 21, with an average daily incident shortwave energy per square meter above 5.9 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 Walpole Island are 42.615 deg latitude, -82.514 deg longitude, and 574 ft elevation.
The topography within 2 miles of Walpole Island is essentially flat, with a maximum elevation change of 33 feet and an average elevation above sea level of 575 feet. Within 10 miles is also essentially flat (69 feet). Within 50 miles is essentially flat (784 feet).
The area within 2 miles of Walpole Island is covered by trees (41%), cropland (23%), water (21%), and artificial surfaces (13%), within 10 miles by cropland (38%) and water (23%), and within 50 miles by cropland (37%) and water (24%).
This report illustrates the typical weather in Walpole Island, 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 Walpole Island.
For each station, the records are corrected for the elevation difference between that station and Walpole Island 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 Walpole Island is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Walpole Island and a given station.
The stations contributing to this reconstruction are: Selfridge Air National Guard Base (51%, 25 kilometers, west); St Clair County International Airport (33%, 33 kilometers, north); and Ridgetown Rcs (16%, 55 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .