This report describes the typical weather at the Sioux Lookout Airport (Sioux Lookout, Ontario, Canada) weather station over the course of an average year. It is based on the historical records from 1982 to 2012. Earlier records are either unavailable or unreliable.
Sioux Lookout, Ontario has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by forests (76%) and lakes and rivers (24%).
Over the course of a year, the temperature typically varies from -9°F to 76°F and is rarely below -28°F or above 84°F.
The warm season lasts from May 20 to September 14 with an average daily high temperature above 63°F. The hottest day of the year is July 23, with an average high of 76°F and low of 58°F.
The cold season lasts from November 26 to February 29 with an average daily high temperature below 23°F. The coldest day of the year is January 22, with an average low of -9°F and high of 10°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 8:04 hours of daylight; the longest day is June 20 with 16:25 hours of daylight.
The earliest sunrise is at 4:57am on June 18 and the latest sunset is at 9:22pm on June 23. The latest sunrise is at 8:07am on January 3 and the earliest sunset is at 4:04pm on December 11.
Daylight saving time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 70% (partly cloudy) to 97% (overcast). The sky is cloudiest on November 15 and clearest on August 2. The clearer part of the year begins around January 10. The cloudier part of the year begins around September 24.
On August 2, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 46% of the time, and overcast or mostly cloudy 52% of the time.
On November 15, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 76% of the time, and clear or mostly clear 22% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 1, occurring in 81% of days. Precipitation is least likely around May 4, occurring in 50% of days.
Over the entire year, the most common forms of precipitation are light snow, light rain, moderate snow, and thunderstorms.
Light snow is the most severe precipitation observed during 43% of those days with precipitation. It is most likely around December 25, when it is observed during 60% of all days.
Light rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around June 2, when it is observed during 25% of all days.
Moderate snow is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around December 1, when it is observed during 17% of all days.
Thunderstorms are the most severe precipitation observed during 11% of those days with precipitation. They are most likely around July 10, when it is observed during 20% of all days.
During the warm season, which lasts from May 20 to September 14, there is a 54% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (41% of days with precipitation have at worst light rain), thunderstorms (31%), and moderate rain (19%).
During the cold season, which lasts from November 26 to February 29, there is a 74% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light snow (76% of days with precipitation have at worst light snow) and moderate snow (19%).
The likelihood of snow falling is highest around December 18, occurring in 77% of days. The season in which it is relatively likely for snow to fall spans from October 7 to April 24.
During peak snow season, accumulation at this location on a given day is just more likely than not. The chances of there being snow on the ground are highest around January 8, occurring 65% of the time. The season in which snow is relatively likely to be on the ground spans from October 26 to April 23.
The snow is typically at its deepest on February 24, with a median depth of 19.4"; the depth exceeds 30.5" only one year out of ten.
The relative humidity typically ranges from 38% (comfortable) to 95% (very humid) over the course of the year, rarely dropping below 20% (dry) and reaching as high as 100% (very humid).
The air is driest around April 26, at which time the relative humidity drops below 46% (comfortable) three days out of four; it is most humid around September 22, exceeding 92% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from -15°F (dry) to 61°F (comfortable) and is rarely below -36°F (dry) or above 67°F (muggy).
The time of the year between June 4 and September 17 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around November 4, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around July 28, at which time the average daily maximum wind speed is 12 mph (moderate breeze).