Istanbul Weather in December
In December, Istanbul averages a high of 11°C (52°F) and a low of 6°C (42°F), from 41 years of daily records (1971–2025).
11°C
Average high
52°F
6°C
Average low
42°F
23°C
Record high
73°F · December 3, 2017
-3°C
Record low
26°F · December 31, 1992
What December Is Like in Istanbul
- December in Istanbul has become 2.3°C (4.1°F) warmer on average: the 2010–2024 average against 1970–1989.
- 6 of the 10 warmest Decembers on record in Istanbul have come since 2010.
- The coldest December reading, -3°C (26°F) on December 31, 1992, has not been matched in 33 years.
- On average, 1.3 nights in December drop below freezing.
At least 1 mm of rain falls on 67% of December days.
Warmest: 2020 (15.7°C)Latest: 2024 (13.4°C)10-year averageLong-run average (11.2°C)
Look Up a Day in December
See the weather in Istanbul on any December date, year by year.
Source: NOAA GHCN-Daily, Istanbul (1971–2007); Istanbul Bolge (Kartal) (2014–2025). Averages cover 1971–2025. How we compute this