Average Weather For Nairobi, Kenya

Location

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%).

Temperature

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.

Daily High and Low Temperature

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

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.

Fraction of Time Spent in Various Temperature Bands

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

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.

Daily Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

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.

Daily Sunrise & Sunset with Twilight

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Clouds

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.

Median Cloud Cover

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

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.

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

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.

Probability of Precipitation at Some Point in the Day

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

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.

Types of Precipitation Throughout the Year

Relative frequency of various types of precipitation over the course of a typical year.

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%).

Warm Season Precipitation

Cold Season Precipitation

Relative frequency of various types of precipitation during the warm and cold seasons respectively.

Snow

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.

Humidity

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.

Relative Humidity

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

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.

Dew Point

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

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).

Wind Speed

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the north east (27% of the time) and east (20% of the time). The wind is least often out of the north west (2% of the time), west (3% of the time), and south west (5% of the time).

Wind Directions Over the Entire Year

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.