July Weather at Fort St. James (Perison) Airport Canada

Daily high temperatures are around 74°F, rarely falling below 64°F or exceeding 83°F. The highest daily average high temperature is 74°F on July 21.

Daily low temperatures are around 52°F, rarely falling below 43°F or exceeding 60°F. The highest daily average low temperature is 53°F on July 21.

For reference, on July 21, the hottest day of the year, temperatures at Fort St. James (Perison) Airport typically range from 53°F to 74°F, while on January 1, the coldest day of the year, they range from -4°F to 14°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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.

Shalinskoye, Russia (4,536 miles away) is the far-away foreign place with temperatures most similar to Fort St. James (Perison) Airport (view comparison).

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The month of July at Fort St. James (Perison) Airport experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 50% to 42%. The lowest chance of overcast or mostly cloudy conditions is 42% on July 30.

The clearest day of the month is July 30, with clear, mostly clear, or partly cloudy conditions 58% of the time.

For reference, on January 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on July 30, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Fort St. James (Perison) Airport, the chance of a wet day over the course of July is very rapidly decreasing, starting the month at 29% and ending it at 19%.

For reference, the year's highest daily chance of a wet day is 40% on November 3, and its lowest chance is 18% on July 30.

Rainfall

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

The average sliding 31-day rainfall during July at Fort St. James (Perison) Airport is decreasing, starting the month at 1.8 inches, when it rarely exceeds 3.3 inches or falls below 0.8 inches, and ending the month at 1.2 inches, when it rarely exceeds 2.3 inches or falls below 0.4 inches.

Over the course of July at Fort St. James (Perison) Airport, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 18 minutes, implying an average daily decrease of 2 minutes, 36 seconds, and weekly decrease of 18 minutes, 10 seconds.

The shortest day of the month is July 31, with 15 hours, 49 minutes of daylight and the longest day is July 1, with 17 hours, 7 minutes of daylight.

The earliest sunrise of the month at Fort St. James (Perison) Airport is 4:47 AM on July 1 and the latest sunrise is 41 minutes later at 5:28 AM on July 31.

The latest sunset is 9:54 PM on July 1 and the earliest sunset is 37 minutes earlier at 9:17 PM on July 31.

Daylight saving time is observed at Fort St. James (Perison) Airport during 2024, but it neither starts nor ends during July, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 4:41 AM and sets 17 hours, 14 minutes later, at 9:55 PM, while on December 21, the shortest day of the year, it rises at 8:36 AM and sets 7 hours, 18 minutes later, at 3:54 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 July 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 at Fort St. James (Perison) Airport is essentially constant during July, remaining around 0% throughout.

For reference, on July 30, 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 at Fort St. James (Perison) Airport is essentially constant during July, remaining around 4.2 miles per hour throughout.

For reference, on April 23, the windiest day of the year, the daily average wind speed is 4.5 miles per hour, while on August 16, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.

The hourly average wind direction at Fort St. James (Perison) Airport throughout July is predominantly from the west, with a peak proportion of 69% on July 16.

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 at Fort St. James (Perison) Airport typically lasts for 3.5 months (109 days), from around May 25 to around September 11, rarely starting before May 8 or after June 12, and rarely ending before August 20 or after September 28.

The month of July at Fort St. James (Perison) Airport 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 at Fort St. James (Perison) Airport are increasing during July, increasing by 395°F, from 416°F to 810°F, over the course of the month.

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 at Fort St. James (Perison) Airport is essentially constant during July, remaining within 0.1 kWh of 6.2 kWh throughout.

The highest average daily incident shortwave solar energy during July is 6.3 kWh on July 3.