Climate and Average Weather Year Round at Kelowna International Airport Canada

At Kelowna International Airport, the summers are warm and dry, the winters are freezing and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 20°F to 84°F and is rarely below 4°F or above 94°F.

Based on the tourism score, the best time of year to visit Kelowna International Airport for warm-weather activities is from early July to mid August.

The warm season lasts for 3.0 months, from June 8 to September 7, with an average daily high temperature above 74°F. The hottest month of the year at Kelowna International Airport is July, with an average high of 82°F and low of 52°F.

The cold season lasts for 3.3 months, from November 14 to February 24, with an average daily high temperature below 41°F. The coldest month of the year at Kelowna International Airport is December, with an average low of 22°F and high of 32°F.

At Kelowna International 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 Kelowna International Airport begins around June 10 and lasts for 3.9 months, ending around October 7.

The clearest month of the year at Kelowna International Airport is July, during which on average the sky is clear, mostly clear, or partly cloudy 69% of the time.

The cloudier part of the year begins around October 7 and lasts for 8.1 months, ending around June 10.

The cloudiest month of the year at Kelowna International Airport is January, during which on average the sky is overcast or mostly cloudy 64% 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 Kelowna International Airport varies throughout the year.

The wetter season lasts 7.5 months, from May 8 to December 25, with a greater than 16% chance of a given day being a wet day. The month with the most wet days at Kelowna International Airport is June, with an average of 6.4 days with at least 0.04 inches of precipitation.

The drier season lasts 4.5 months, from December 25 to May 8. The month with the fewest wet days at Kelowna International Airport is February, with an average of 2.9 days with at least 0.04 inches of precipitation.

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 Kelowna International Airport changes throughout the year.

Rain alone is the most common for 10 months, from February 4 to December 7. The month with the most days of rain alone at Kelowna International Airport is June, with an average of 6.4 days.

Snow alone is the most common for 1.9 months, from December 7 to February 4. The month with the most days of snow alone at Kelowna International Airport is December, with an average of 2.4 days.

Rainfall

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. Kelowna International Airport experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.7 months, from April 1 to November 24, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Kelowna International Airport is June, with an average rainfall of 1.4 inches.

The rainless period of the year lasts for 4.3 months, from November 24 to April 1. The month with the least rain at Kelowna International Airport is January, with an average rainfall of 0.2 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Kelowna International Airport experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 3.9 months, from November 8 to March 4, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Kelowna International Airport is December, with an average snowfall of 3.4 inches.

The snowless period of the year lasts for 8.1 months, from March 4 to November 8. The least snow falls around July 25, with an average total accumulation of 0.0 inches.

The length of the day at Kelowna International Airport varies extremely over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 5 minutes of daylight; the longest day is June 20, with 16 hours, 22 minutes of daylight.

The earliest sunrise is at 4:47 AM on June 15, and the latest sunrise is 3 hours, 8 minutes later at 7:55 AM on December 30. The earliest sunset is at 3:55 PM on December 11, and the latest sunset is 5 hours, 15 minutes later at 9:10 PM on June 25.

Daylight saving time (DST) is observed at Kelowna International Airport during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

The figure below presents a compact representation of key lunar data for 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.

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 perceived humidity level at Kelowna International Airport, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

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 Kelowna International Airport does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 4.0 miles per hour throughout.

The predominant average hourly wind direction at Kelowna International Airport varies throughout the year.

The wind is most often from the west for 5.6 months, from April 8 to September 27, with a peak percentage of 62% on June 29. The wind is most often from the south for 6.4 months, from September 27 to April 8, with a peak percentage of 57% on January 1.

To characterize how pleasant the weather is at Kelowna International Airport 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 Kelowna International Airport for general outdoor tourist activities is from early July to mid August, with a peak score in the last week of July.

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 Kelowna International Airport for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.

Methodology

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.

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 Kelowna International Airport typically lasts for 4.5 months (140 days), from around May 12 to around September 28, rarely starting before April 23 or after May 30, and rarely ending before September 11 or after October 15.

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.

Based on growing degree days alone, the first spring blooms at Kelowna International Airport should appear around April 29, only rarely appearing before April 19 or after May 12.

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from May 7 to August 19, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year at Kelowna International Airport is July, with an average of 7.1 kWh.

The darker period of the year lasts for 3.7 months, from October 24 to February 14, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest month of the year at Kelowna International Airport is December, with an average of 1.0 kWh.

For the purposes of this report, the geographical coordinates of Kelowna International Airport are 49.956 deg latitude, -119.378 deg longitude, and 1,385 ft elevation.

The topography within 2 miles of Kelowna International Airport contains very significant variations in elevation, with a maximum elevation change of 1,066 feet and an average elevation above sea level of 1,560 feet. Within 10 miles contains very significant variations in elevation (4,341 feet). Within 50 miles also contains extreme variations in elevation (6,857 feet).

The area within 2 miles of Kelowna International Airport is covered by sparse vegetation (53%), grassland (19%), and shrubs (14%), within 10 miles by trees (48%) and sparse vegetation (20%), and within 50 miles by trees (71%) and sparse vegetation (14%).