Derna climate by month
What the weather is like
Derna has a hot semi-arid climate (Köppen BSh): little rain, large day–night swings and strong sunshine.
The warmest month is August, when afternoons average 31° and nights 23°. January is the coolest month, with highs of 17° and lows of 10°. The difference between the warmest and the coolest month is about 13°.
About 295 mm of precipitation falls in an average year. January is the wettest month (75 mm, 11 wet days) and July the driest (0 mm, 0 wet days). Cloud cover ranges from 1% in July to 27% in January.
The sea reaches about 26° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Tripoli, the capital, Derna is 0.8° warmer on a August afternoon and receives less precipitation over the year.
Year in figures
- Hottest afternoons
- 31° · August
- Coldest nights
- 10° · February
- Wettest month
- January
- Driest month
- July
- Clearest skies
- July · 1% cloud
- Warmest sea
- 26° · August
- Longest day
- 14 h 18 min
- Shortest day
- 10 h 00 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 17° | 18° | 20° | 23° | 27° | 30° | 31° | 31° | 30° | 27° | 22° | 19° |
| Average low | 10° | 10° | 11° | 13° | 16° | 20° | 22° | 23° | 21° | 18° | 15° | 12° |
| Precipitation | 75 mm | 46 mm | 26 mm | 8 mm | 6 mm | 1 mm | 0 mm | 0 mm | 4 mm | 24 mm | 34 mm | 71 mm |
| Wet days (≥1 mm) | 10.7 | 6 | 4.7 | 1.5 | 1.5 | 0.7 | 0 | 0.7 | 2.2 | 3.5 | 4.3 | 7.8 |
| Cloud cover | 27% | 25% | 22% | 19% | 16% | 5% | 1% | 2% | 6% | 16% | 23% | 27% |
| Sea temperature | 18° | 17° | 17° | 17° | 19° | 23° | 25° | 26° | 26° | 24° | 22° | 20° |
| Daylight | 10h 13 | 11h 01 | 11h 56 | 12h 59 | 13h 50 | 14h 18 | 14h 07 | 13h 23 | 12h 24 | 11h 24 | 10h 29 | 10h 00 |
| Month score | 70 | 83 | 89 | 96 | 89 | 78 | 76 | 72 | 75 | 85 | 90 | 82 |