Summer Weather in Lake Cowichan Canada

Daily high temperatures increase by 6°F, from 62°F to 68°F, rarely falling below 55°F or exceeding 81°F. The highest daily average high temperature is 71°F on July 31.

Daily low temperatures increase by 4°F, from 47°F to 51°F, rarely falling below 43°F or exceeding 58°F. The highest daily average low temperature is 54°F on August 1.

For reference, on July 31, the hottest day of the year, temperatures in Lake Cowichan typically range from 54°F to 71°F, while on December 28, the coldest day of the year, they range from 32°F to 40°F.

The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Westfield, United Kingdom (4,699 miles away) and Fumay, France (4,970 miles) are the far-away foreign places with temperatures most similar to Lake Cowichan (view comparison).

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The summer in Lake Cowichan experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 51% to 36%. The lowest chance of overcast or mostly cloudy conditions is 27% on August 2.

The clearest day of the summer is August 2, with clear, mostly clear, or partly cloudy conditions 73% of the time.

For reference, on January 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 74%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Lake Cowichan, the chance of a wet day over the course of the summer is very rapidly decreasing, starting the season at 24% and ending it at 16%.

For reference, the year's highest daily chance of a wet day is 58% on November 17, and its lowest chance is 9% on August 5.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Lake Cowichan is gradually decreasing, starting the season at 1.6 inches, when it rarely exceeds 3.1 inches or falls below 0.4 inches, and ending the season at 1.3 inches, when it rarely exceeds 2.7 inches or falls below 0.2 inches.

The lowest average 31-day accumulation is 0.7 inches on July 29.

Over the course of the summer in Lake Cowichan, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 2 hours, 29 minutes, implying an average daily decrease of 1 minute, 38 seconds, and weekly decrease of 11 minutes, 26 seconds.

The shortest day of the summer is August 31, with 13 hours, 26 minutes of daylight and the longest day is June 20, with 16 hours, 11 minutes of daylight.

The earliest sunrise of the summer in Lake Cowichan is 5:12 AM on June 15 and the latest sunrise is 1 hour, 20 minutes later at 6:32 AM on August 31.

The latest sunset is 9:23 PM on June 24 and the earliest sunset is 1 hour, 25 minutes earlier at 7:58 PM on August 31.

Daylight saving time is observed in Lake Cowichan during 2024, but it neither starts nor ends during the summer, so the entire season is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:12 AM and sets 16 hours, 11 minutes later, at 9:23 PM, while on December 21, the shortest day of the year, it rises at 8:07 AM and sets 8 hours, 15 minutes later, at 4:22 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the summer of 2024. 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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.

The chance that a given day will be muggy in Lake Cowichan is essentially constant during the summer, remaining around 0% throughout.

For reference, on July 7, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Lake Cowichan is gradually decreasing during the summer, decreasing from 4.6 miles per hour to 4.0 miles per hour over the course of the season.

For reference, on December 3, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 3.9 miles per hour.

The lowest daily average wind speed during the summer is 3.9 miles per hour on August 13.

The hourly average wind direction in Lake Cowichan throughout the summer is predominantly from the west, with a peak proportion of 74% on July 21.

Lake Cowichan 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 surface water temperature in Lake Cowichan is gradually increasing during the summer, rising by 3°F, from 54°F to 57°F, over the course of the season.

The highest average surface water temperature during the summer is 58°F on August 2.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Lake Cowichan typically lasts for 7.0 months (216 days), from around April 5 to around November 7, rarely starting before March 13 or after April 28, and rarely ending before October 19 or after November 27.

The summer in Lake Cowichan is reliably fully within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Lake Cowichan are rapidly increasing during the summer, increasing by 837°F, from 145°F to 983°F, over the course of the season.

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 in Lake Cowichan is gradually decreasing during the summer, falling by 0.9 kWh, from 6.0 kWh to 5.1 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 6.8 kWh on July 19.

For the purposes of this report, the geographical coordinates of Lake Cowichan are 48.825 deg latitude, -124.055 deg longitude, and 571 ft elevation.

The topography within 2 miles of Lake Cowichan contains large variations in elevation, with a maximum elevation change of 2,300 feet and an average elevation above sea level of 847 feet. Within 10 miles contains large variations in elevation (4,685 feet). Within 50 miles also contains extreme variations in elevation (5,879 feet).

The area within 2 miles of Lake Cowichan is covered by trees (75%), within 10 miles by trees (90%), and within 50 miles by trees (47%) and water (44%).