This report describes the typical weather at the Mariscal Sucre International Airport (Quito, Ecuador) weather station over the course of an average year. It is based on the historical records from 2006 to 2012. Earlier records are either unavailable or unreliable.
Quito has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by grasslands (34%), tundra (25%), shrublands (18%), forests (11%), and croplands (10%).
Over the course of a year, the temperature typically varies from 48°F to 69°F and is rarely below 45°F or above 72°F.
The warm season lasts from September 13 to October 6 with an average daily high temperature above 68°F. The hottest day of the year is September 30, with an average high of 69°F and low of 49°F.
The cold season lasts from February 7 to March 5 with an average daily high temperature below 66°F. The coldest day of the year is July 18, with an average low of 48°F and high of 67°F.
The length of the day does not vary substantially over the course of the year, staying within 9 minutes of 12 hours throughout. The shortest day is December 21 with 12:07 hours of daylight; the longest day is June 20 with 12:09 hours of daylight.
The earliest sunrise is at 5:54am on November 2 and the latest sunset is at 6:32pm on February 10. The latest sunrise is at 6:25am on February 13 and the earliest sunset is at 6:01pm on November 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover ranges from 59% (partly cloudy) to 88% (mostly cloudy). The sky is cloudiest on March 14 and clearest on July 17. The clearer part of the year begins around May 30. The cloudier part of the year begins around October 2.
On July 17, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 58% of the time, and overcast or mostly cloudy 40% of the time.
On March 14, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 85% of the time, and clear or mostly clear 5% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around April 9, occurring in 73% of days. Precipitation is least likely around August 15, occurring in 29% of days.
Over the entire year, the most common forms of precipitation are light rain, moderate rain, and thunderstorms.
Light rain is the most severe precipitation observed during 32% of those days with precipitation. It is most likely around June 10, when it is observed during 23% of all days.
Moderate rain is the most severe precipitation observed during 30% of those days with precipitation. It is most likely around March 14, when it is observed during 23% of all days.
Thunderstorms are the most severe precipitation observed during 30% of those days with precipitation. They are most likely around April 12, when it is observed during 32% of all days.
During the warm season, which lasts from September 13 to October 6, there is a 43% 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 thunderstorms (44% of days with precipitation have at worst thunderstorms), light rain (28%), and moderate rain (22%).
During the cold season, which lasts from February 7 to March 5, there is a 49% 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 moderate rain (40% of days with precipitation have at worst moderate rain), light rain (28%), thunderstorms (22%), and heavy rain (6%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 35% (comfortable) to 98% (very humid) over the course of the year, rarely dropping below 27% (dry) and reaching as high as 100% (very humid).
The air is driest around August 10, at which time the relative humidity drops below 39% (comfortable) three days out of four; it is most humid around December 19, exceeding 96% (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 37°F (dry) to 54°F (very comfortable) and is rarely below 32°F (dry) or above 56°F (comfortable).
There are two periods in the year that are most comfortable: The first is between January 1 and June 23 and the second is between September 25 and December 31. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 6 mph (light breeze) occurs around August 3, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around April 15, at which time the average daily maximum wind speed is 12 mph (gentle breeze).