Byblos climate — normals and trends
Byblos (Lebanon) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 14.9 °C and it receives 676 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (23.1 °C on average) and the coldest is January (6.3 °C). Rainfall peaks in January.
Byblos averages 13 frost days, 8 hot days (≥ 30 °C) and 80 rainy days per year.
Byblos has warmed by +1.8 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 17 to 9 per year over the period.
The hottest day of the period reached 35.0 °C (on 14 August 2025) and the coldest -13.2 °C (on 19 January 1964).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
ByblosMount Lebanon
- coords
- 34.12°, 35.65°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.9°C
Average daily high
19.3°C
Average daily low
10.7°C
Annual rainfall
676mm
Sunshine / day
11.0h
Mean relative humidity
68%
Average peak wind
12.9km/h
Seasonal range
16.8°C
Frost days (< 0 °C)
13 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
80 d/yr
Annual snowfall
44.4 cm
Average feels-like high
18.8 °C
Average feels-like low
9.0 °C
Average peak gust
33.6 km/h
Tropical nights (≥ 20 °C)
15 d/yr
Solar radiation
19.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.38 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
35.0 °C
14 August 2025
Coldest day
-13.2 °C
19 January 1964
Wettest day
84 mm
17 October 1984
Windiest day
39.2 km/h
12 March 1953
Strongest gust
108.4 km/h
12 March 1953
Hottest feels-like
38.2 °C
3 August 2015
Coldest feels-like
-18.4 °C
19 January 1964
Snowiest day
26.4 cm
14 January 1968
Sunniest day
13.8 h
3 July 1941
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 13.9 °C | +3.7 °C | 14 mm | -123 mm |
| Feb | 9.5 °C | -1.4 °C | 121 mm | -5 mm |
| Mar | 16.9 °C | +3.6 °C | 51 mm | -62 mm |
| Apr | 18.6 °C | +1.4 °C | 47 mm | -9 mm |
| May | 23.4 °C | +2.2 °C | 21 mm | -2 mm |
| Jun | 26.8 °C | +1.9 °C | 1 mm | -3 mm |
| Jul | 28.8 °C | +1.5 °C | 0 mm | -1 mm |
| Aug | 29.6 °C | +1.7 °C | 4 mm | +3 mm |
| Sep | 26.9 °C | +0.8 °C | 5 mm | 0 mm |
| Oct | 23.1 °C | +0.5 °C | 13 mm | -17 mm |
| Nov | 21.6 °C | +4.1 °C | 52 mm | -15 mm |
| Dec | 13.6 °C | +1.0 °C | 138 mm | +23 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Byblos?
Byblos has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 14.9 °C and it receives 676 mm of precipitation per year.
What is the hottest day ever recorded in Byblos?
The hottest day measured in Byblos between 1940 and 2025 was 14 August 2025, reaching 35.0 °C.
What is the coldest day in Byblos?
The coldest day measured in Byblos between 1940 and 2025 was 19 January 1964, at -13.2 °C.
Does it snow in Byblos?
Yes. Byblos gets on average 44.4 cm of snow per year and has around 13 frost days.
Has the climate of Byblos warmed?
Yes: Byblos warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Byblos?
The wettest day measured in Byblos between 1940 and 2025 was 17 October 1984, with 84 mm of rain in 24 hours.
What was the windiest day in Byblos?
The windiest day measured in Byblos between 1940 and 2025 was 12 March 1953, with winds reaching 39.2 km/h.
What is the warmest month in Byblos?
The warmest month in Byblos is August (23.1 °C on average); the coldest is January (6.3 °C).
How much does it rain in Byblos?
Byblos receives on average 676 mm of precipitation per year, spread over about 80 rainy days.
Is it sunny in Byblos?
Byblos gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Byblos?
The heaviest 24-hour snowfall measured in Byblos between 1940 and 2025 was 14 January 1968, with 26.4 cm.
Are there tropical nights in Byblos?
Yes: Byblos has on average 15 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Byblos?
In Byblos, between 1940 and 2025, the highest apparent temperature reached 38.2 °C on 3 August 2015, and the lowest was -18.4 °C on 19 January 1964.
Compare Byblos with another city
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Nearby cities
The climate around Byblos