Average Weather in Guelph Canada
In Guelph, the summers are comfortable; 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 12°F to 78°F and is rarely below -5°F or above 86°F.
Based on the tourism score, the best time of year to visit Guelph for warm-weather activities is from late June to early September.
The warm season lasts for 3.8 months, from May 23 to September 18, with an average daily high temperature above 68°F. The hottest day of the year is July 19, with an average high of 78°F and low of 58°F.
The cold season lasts for 3.3 months, from December 2 to March 13, with an average daily high temperature below 37°F. The coldest day of the year is January 29, with an average low of 12°F and high of 26°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 Guelph, 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 Guelph begins around May 25 and lasts for 5.1 months, ending around October 29. On August 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.
The cloudier part of the year begins around October 29 and lasts for 6.9 months, ending around May 25. On January 10, the cloudiest day of the year, the sky is overcast or mostly cloudy 66% of the time, and clear, mostly clear, or partly cloudy 34% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Guelph varies throughout the year.
The wetter season lasts 7.0 months, from April 4 to November 3, with a greater than 23% chance of a given day being a wet day. The chance of a wet day peaks at 30% on July 31.
The drier season lasts 5.0 months, from November 3 to April 4. The smallest chance of a wet day is 15% on February 18.
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 Guelph changes throughout the year.
Rain alone is the most common for 9.8 months, from March 8 to December 31. The highest chance of a day with rain alone is 30% on July 31.
Snow alone is the most common for 2.2 months, from December 31 to March 8. The highest chance of a day with snow alone is 10% on January 20.
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. Guelph experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 11 months, from February 16 to January 16, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 23, with an average total accumulation of 2.4 inches.
The rainless period of the year lasts for 1.0 months, from January 16 to February 16. The least rain falls around January 28, with an average total accumulation of 0.4 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. Guelph experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.4 months, from November 8 to April 21, 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 8, with an average total liquid-equivalent accumulation of 0.6 inches.
The snowless period of the year lasts for 6.6 months, from April 21 to November 8. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Guelph varies significantly over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 56 minutes of daylight; the longest day is June 20, with 15 hours, 26 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:39 AM on June 15, and the latest sunrise is 2 hours, 24 minutes later at 8:03 AM on November 6. The earliest sunset is at 4:44 PM on December 8, and the latest sunset is 4 hours, 22 minutes later at 9:06 PM on June 26.
Daylight saving time (DST) is observed in Guelph during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.
Sunrise & Sunset with Twilight and Daylight Saving Time
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & Phases
Guelph experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.5 months, from June 3 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. The muggiest day of the year is July 31, with muggy conditions 24% of the time.
The least muggy day of the year is December 3, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Guelph experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.2 months, from October 27 to May 2, with average wind speeds of more than 10.9 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 13.6 miles per hour.
The calmer time of year lasts for 5.8 months, from May 2 to October 27. The calmest day of the year is August 4, with an average hourly wind speed of 8.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Guelph is from the west throughout the year.
Guelph 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 2.6 months, from July 8 to September 27, with an average temperature above 61°F. The day of the year with the warmest water is August 11, with an average temperature of 68°F.
The time of year with cooler water lasts for 4.9 months, from December 21 to May 16, with an average temperature below 41°F. The day of the year with the coolest water is March 10, with an average temperature of 35°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Guelph 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 Guelph for general outdoor tourist activities is from late June to early September, with a peak score in the first 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 Guelph 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 Guelph typically lasts for 5.0 months (153 days), from around May 7 to around October 6, rarely starting before April 18 or after May 27, and rarely ending before September 20 or after October 23.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Guelph should appear around May 5, only rarely appearing before April 23 or after May 17.
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 3.5 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 June 30, with an average of 6.9 kWh.
The darker period of the year lasts for 3.5 months, from October 31 to February 13, with an average daily incident shortwave energy per square meter below 2.4 kWh. The darkest day of the year is December 23, with an average of 1.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Guelph are 43.546 deg latitude, -80.256 deg longitude, and 1,086 ft elevation.
The topography within 2 miles of Guelph contains only modest variations in elevation, with a maximum elevation change of 180 feet and an average elevation above sea level of 1,077 feet. Within 10 miles also contains only modest variations in elevation (489 feet). Within 50 miles contains only modest variations in elevation (1,526 feet).
The area within 2 miles of Guelph is covered by artificial surfaces (80%) and trees (12%), within 10 miles by cropland (49%) and trees (34%), and within 50 miles by cropland (48%) and trees (20%).
This report illustrates the typical weather in Guelph, 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 Guelph.
For each station, the records are corrected for the elevation difference between that station and Guelph 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 Guelph is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Guelph and a given station.
The stations contributing to this reconstruction are: Guelph Turfgrass (89%, 3.2 kilometers, east); Kitchener/Waterloo Airport (10%, 14 kilometers, southwest); and Mount Forest, Ont. (1.0%, 63 kilometers, northwest).
Time zones for airports and weather stations are provided by AskGeo.com .