Climate averages 1991–2020
Isiolo weather
in December.
A warm, moderately wet month: the 11th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Isiolo: daytime highs average 26.7°C and nights cool to about 16.6°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 55 mm of rain on roughly 13 days, which makes December a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 06 min on an average December day.
The nearest other city in this atlas is Meru (35 km away). In December its highs average 22.7°C, 4.0°C cooler than Isiolo, with 55 mm of rain.
Among the 37 cities listed in Kenya, Isiolo ranks 13th of 37 for the warmest December highs and joint 14th of 37 for the driest December (rainfall, lowest first). The mean December high of those 37 cities is 26.0°C; Isiolo is 0.7°C warmer than that mean.
From December to January, average highs rise by 1.4°C to 28.1°C, and monthly rainfall falls from 55 mm to 41 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Isiolo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.1°C16.6°C | 16.6°C | 41 | 8.2 | 12.112 h |
| February | 29.4°C17.2°C | 17.2°C | 23 | 4.9 | 12.112 h |
| March | 29.5°C18.1°C | 18.1°C | 43 | 8.6 | 12.112 h |
| April | 28.7°C18.8°C | 18.8°C | 76 | 11.2 | 12.112 h |
| May | 28.9°C18.5°C | 18.5°C | 47 | 7.5 | 12.112 h |
| June | 28.0°C17.4°C | 17.4°C | 28 | 5.6 | 12.112 h |
| July | 27.2°C16.7°C | 16.7°C | 38 | 7.8 | 12.112 h |
| August | 27.7°C16.7°C | 16.7°C | 40 | 9.0 | 12.112 h |
| September | 29.2°C17.2°C | 17.2°C | 27 | 5.7 | 12.112 h |
| October | 29.0°C18.3°C | 18.3°C | 52 | 10.0 | 12.112 h |
| November | 26.2°C17.6°C | 17.6°C | 99 | 19.8 | 12.112 h |
| December, selected | 26.7°C16.6°C | 16.6°C | 55 | 13.3 | 12.112 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Meru in DecemberKenya · 35 kmHigh 22.7°C · Low 13.9°C · 55 mm rain
- Nanyuki in DecemberKenya · 69 kmHigh 21.4°C · Low 11.9°C · 62 mm rain
- Nyeri in DecemberKenya · 111 kmHigh 21.1°C · Low 11.5°C · 181 mm rain
- Karuri (Murang'A), Kenya in DecemberKenya · 125 kmHigh 24.4°C · Low 14.2°C · 55 mm rain
- Thika in DecemberKenya · 165 kmHigh 23.5°C · Low 14.4°C · 72 mm rain
- Naivasha in DecemberKenya · 175 kmHigh 22.3°C · Low 13.1°C · 119 mm rain
- Ruiru in DecemberKenya · 181 kmHigh 23.5°C · Low 14.0°C · 57 mm rain
- Nakuru in DecemberKenya · 183 kmHigh 23.1°C · Low 13.2°C · 38 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Isiolo) is explained once on the Isiolo year overview and on the Sources, method and limits page.