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Average Weather in Ilembo Tanzania

In Ilembo, the wet season is overcast, the dry season is mostly clear, and it is comfortable year round. Over the course of the year, the temperature typically varies from 41°F to 75°F and is rarely below 36°F or above 79°F.

Based on the tourism score, the best time of year to visit Ilembo for warm-weather activities is from late August to mid November.

Climate Summary

comfortablecoolcomfortablewarmcomfortableJanFebMarAprMayJunJulAugSepOctNovDec83%83%10%10%clearovercastprecipitation: 8.7 inprecipitation: 8.7 in0.0 in0.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 7.3tourism score: 7.33.83.8
Click on each chart for more information.

Temperature

The warm season lasts for 2.4 months, from September 24 to December 4, with an average daily high temperature above 73°F. The hottest day of the year is October 30, with an average high of 75°F and low of 56°F.

The cool season lasts for 3.1 months, from May 5 to August 8, with an average daily high temperature below 66°F. The coldest day of the year is July 5, with an average low of 41°F and high of 64°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in IlemboJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoldcoolcomfortablecomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Teteles de Avila Castillo, Mexico (9,091 miles away) is the far-away foreign place with temperatures most similar to Ilembo (view comparison).

Clouds

In Ilembo, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Ilembo begins around April 21 and lasts for 6.5 months, ending around November 4. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 83% of the time, and overcast or mostly cloudy 17% of the time.

The cloudier part of the year begins around November 4 and lasts for 5.5 months, ending around April 21. On January 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 90% of the time, and clear, mostly clear, or partly cloudy 10% of the time.

Cloud Cover Categories

Cloud Cover Categories in IlemboclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 383%Aug 383%Jan 1610%Jan 1610%Apr 2146%Apr 2146%Nov 447%Nov 447%clearmostly clearovercastpartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Ilembo varies very significantly throughout the year.

The wetter season lasts 4.8 months, from November 26 to April 19, with a greater than 35% chance of a given day being a wet day. The chance of a wet day peaks at 71% on January 29.

The drier season lasts 7.2 months, from April 19 to November 26. The smallest chance of a wet day is 0% on August 30.

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 throughout the year is rain alone, with a peak probability of 71% on January 29.

Daily Chance of Precipitation

Daily Chance of Precipitation in IlembowetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 2971%Jan 2971%Aug 300%Aug 300%Jan 168%Jan 168%Nov 2635%Nov 2635%Apr 1935%Apr 1935%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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. Ilembo experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.3 months, from October 16 to May 25, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around January 1, with an average total accumulation of 8.7 inches.

The rainless period of the year lasts for 4.7 months, from May 25 to October 16. The least rain falls around August 26, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Ilembo does not vary substantially over the course of the year, staying within 40 minutes of 12 hours throughout. In 2018, the shortest day is June 21, with 11 hours, 35 minutes of daylight; the longest day is December 22, with 12 hours, 40 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 6:14 AM on November 16, and the latest sunrise is 49 minutes later at 7:03 AM on July 13. The earliest sunset is at 6:32 PM on May 27, and the latest sunset is 43 minutes later at 7:15 PM on January 27.

Daylight saving time (DST) is not observed in Ilembo during 2018.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in IlemboJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNov 166:14 AMNov 166:14 AM7:15 PMJan 277:15 PMJan 27May 276:32 PMMay 276:32 PM7:03 AMJul 137:03 AMJul 13daySolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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 in Ilembo, 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.

Humidity Comfort Levels

Humidity Comfort Levels in IlemboJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 270%Jun 270%Mar 100%Mar 100%humidhumidcomfortablecomfortabledrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 in Ilembo experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.4 months, from April 10 to November 23, with average wind speeds of more than 6.3 miles per hour. The windiest day of the year is August 26, with an average hourly wind speed of 8.6 miles per hour.

The calmer time of year lasts for 4.6 months, from November 23 to April 10. The calmest day of the year is February 22, with an average hourly wind speed of 4.0 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Ilembo is from the east throughout the year.

Wind Direction

Wind Direction in IlemboJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westeastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in Ilembo 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 Ilembo for general outdoor tourist activities is from late August to mid November, with a peak score in the first week of October.

Tourism Score

Tourism Score in Ilembobest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.37.33.83.85.95.94.94.9 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Ilembo for hot-weather activities is from late September to mid November, with a peak score in the third week of October.

Beach/Pool Score

Beach/Pool Score in Ilembobest timeJanFebMarAprMayJunJulAugSepOctNovDec02468103.43.40.20.21.21.2 precipitationprecipitationcloudscloudsbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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.

Growing Season

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).

Temperatures in Ilembo are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Ilembogrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%90%Jul 2490%Jul 2490%Jun 2290%Jun 2284%Jul 784%Jul 7Jan 15100%Jan 15100%very coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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.

Growing Degree Days

Growing Degree Days in IlemboJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°FJul 1990°FJul 1990°FOct 16900°FOct 16900°FDec 161,800°FDec 161,800°FJun 303,791°FJun 303,791°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.5 months, from August 25 to November 9, with an average daily incident shortwave energy per square meter above 7.0 kWh. The brightest day of the year is October 2, with an average of 7.5 kWh.

The darker period of the year lasts for 2.6 months, from December 19 to March 7, with an average daily incident shortwave energy per square meter below 5.4 kWh. The darkest day of the year is January 16, with an average of 4.9 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in IlembobrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhOct 27.5 kWhOct 27.5 kWhJan 164.9 kWhJan 164.9 kWhDec 195.4 kWhDec 195.4 kWhMar 75.4 kWhMar 75.4 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Ilembo are -9.250 deg latitude, 33.383 deg longitude, and 6,621 ft elevation.

The topography within 2 miles of Ilembo contains significant variations in elevation, with a maximum elevation change of 617 feet and an average elevation above sea level of 6,591 feet. Within 10 miles contains significant variations in elevation (4,341 feet). Within 50 miles also contains extreme variations in elevation (8,159 feet).

The area within 2 miles of Ilembo is covered by shrubs (49%), cropland (30%), and grassland (21%), within 10 miles by shrubs (34%) and cropland (31%), and within 50 miles by cropland (33%) and trees (28%).

Data Sources

This report illustrates the typical weather in Ilembo, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There is only a single weather station, Mbeya Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Ilembo.

At a distance of 36 kilometers from Ilembo, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Ilembo according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.