This report describes the typical weather at the Nairobi (Jomo Kenyatta) International Airport (Nairobi, Kenya) weather station over the course of an average year. It is based on the historical records from 2003 to 2012. Earlier records are either unavailable or unreliable.
Nairobi has a mild temperate climate with dry winters and warm summers. The area within 25 mi of this station is covered by grasslands (53%), forests (33%), and croplands (12%).
Over the course of a year, the temperature typically varies from 53°F to 82°F and is rarely below 49°F or above 86°F.
The warm season lasts from January 26 to March 28 with an average daily high temperature above 80°F. The hottest day of the year is March 3, with an average high of 82°F and low of 59°F.
The cold season lasts from June 9 to August 18 with an average daily high temperature below 74°F. The coldest day of the year is July 8, with an average low of 53°F and high of 73°F.
The length of the day does not vary substantially over the course of the year, staying within 12 minutes of 12 hours throughout. The shortest day is June 20 with 12:03 hours of daylight; the longest day is December 21 with 12:11 hours of daylight.
The earliest sunrise is at 6:11am on November 2 and the latest sunset is at 6:52pm on February 11. The latest sunrise is at 6:42am on February 17 and the earliest sunset is at 6:21pm on October 24.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 53% (partly cloudy) to 82% (mostly cloudy). The sky is cloudiest on July 14 and clearest on January 13. The clearer part of the year begins around December 3. The cloudier part of the year begins around March 26.
On January 13, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 60% of the time, and overcast or mostly cloudy 27% of the time.
On July 14, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 82% of the time, and clear or mostly clear 12% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around April 18, occurring in 49% of days. Precipitation is least likely around January 31, occurring in 19% of days.
Over the entire year, the most common forms of precipitation are light rain, moderate rain, thunderstorms, and drizzle.
Light rain is the most severe precipitation observed during 37% of those days with precipitation. It is most likely around November 14, when it is observed during 21% of all days.
Moderate rain is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around November 10, when it is observed during 17% of all days.
Thunderstorms are the most severe precipitation observed during 22% of those days with precipitation. They are most likely around April 16, when it is observed during 21% of all days.
Drizzle is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around August 1, when it is observed during 9% of all days.
During the warm season, which lasts from January 26 to March 28, there is a 26% 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 (34% of days with precipitation have at worst thunderstorms), light rain (33%), and moderate rain (30%).
During the cold season, which lasts from June 9 to August 18, there is a 24% 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 (40% of days with precipitation have at worst light rain), drizzle (28%), moderate rain (17%), and thunderstorms (13%).
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 32% (comfortable) to 98% (very humid) over the course of the year, rarely dropping below 21% (dry) and reaching as high as 100% (very humid).
The air is driest around February 28, at which time the relative humidity drops below 36% (comfortable) three days out of four; it is most humid around April 23, exceeding 97% (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 47°F (dry) to 62°F (mildy humid) and is rarely below 38°F (dry) or above 64°F (mildy humid).
The time of the year between January 1 and December 31 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 19 mph (calm to fresh breeze), rarely exceeding 40 mph (gale).
The highest average wind speed of 10 mph (gentle breeze) occurs around December 11, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around June 12, at which time the average daily maximum wind speed is 12 mph (moderate breeze).