Bacau climate — normals and trends
Bacau (Romania) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.6 °C and it receives 552 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 July (21.3 °C on average) and the coldest is January (-3.3 °C). Rainfall peaks in June.
Bacau averages 109 frost days, 15 hot days (≥ 30 °C) and 91 rainy days per year.
Bacau has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 127 to 91 per year over the period.
The hottest day of the period reached 39.3 °C (on 24 July 2007) and the coldest -27.6 °C (on 29 January 1963).
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
BacauBacău County
- coords
- 46.57°, 26.91°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.6°C
Average daily high
14.2°C
Average daily low
5.4°C
Annual rainfall
552mm
Sunshine / day
8.5h
Mean relative humidity
74%
Average peak wind
14.1km/h
Seasonal range
24.6°C
Frost days (< 0 °C)
109 d/yr
Hot days (≥ 30 °C)
15 d/yr
Rainy days (≥ 1 mm)
91 d/yr
Annual snowfall
68.2 cm
Average feels-like high
12.3 °C
Average feels-like low
3.0 °C
Average peak gust
31.9 km/h
Tropical nights (≥ 20 °C)
3 d/yr
Solar radiation
12.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.47 · 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
39.3 °C
24 July 2007
Coldest day
-27.6 °C
29 January 1963
Wettest day
86 mm
14 June 1949
Windiest day
41.2 km/h
19 February 1946
Strongest gust
88.9 km/h
27 September 1974
Hottest feels-like
42.3 °C
22 August 2000
Coldest feels-like
-33.4 °C
5 February 1950
Snowiest day
31.9 cm
10 February 1984
Sunniest day
15.1 h
27 June 2020
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 7.7 °C | +7.4 °C | 11 mm | -19 mm |
| Feb | 2.0 °C | -0.6 °C | 8 mm | -23 mm |
| Mar | 13.8 °C | +5.7 °C | 47 mm | +12 mm |
| Apr | 16.4 °C | +1.2 °C | 23 mm | -31 mm |
| May | 18.4 °C | -2.2 °C | 170 mm | +103 mm |
| Jun | 26.8 °C | +2.4 °C | 7 mm | -69 mm |
| Jul | 29.5 °C | +3.1 °C | 49 mm | -14 mm |
| Aug | 29.0 °C | +2.7 °C | 9 mm | -38 mm |
| Sep | 23.5 °C | +1.8 °C | 37 mm | -5 mm |
| Oct | 14.1 °C | -1.0 °C | 74 mm | +38 mm |
| Nov | 10.4 °C | +2.6 °C | 44 mm | +7 mm |
| Dec | 5.4 °C | +3.0 °C | 11 mm | -24 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 Bacau?
Bacau has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.6 °C and it receives 552 mm of precipitation per year.
What is the hottest day ever recorded in Bacau?
The hottest day measured in Bacau between 1940 and 2025 was 24 July 2007, reaching 39.3 °C.
What is the coldest day in Bacau?
The coldest day measured in Bacau between 1940 and 2025 was 29 January 1963, at -27.6 °C.
Does it snow in Bacau?
Yes. Bacau gets on average 68.2 cm of snow per year and has around 109 frost days.
Has the climate of Bacau warmed?
Yes: Bacau warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bacau?
The wettest day measured in Bacau between 1940 and 2025 was 14 June 1949, with 86 mm of rain in 24 hours.
What was the windiest day in Bacau?
The windiest day measured in Bacau between 1940 and 2025 was 19 February 1946, with winds reaching 41.2 km/h.
What is the warmest month in Bacau?
The warmest month in Bacau is July (21.3 °C on average); the coldest is January (-3.3 °C).
How much does it rain in Bacau?
Bacau receives on average 552 mm of precipitation per year, spread over about 91 rainy days.
Is it sunny in Bacau?
Bacau gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Bacau?
The heaviest 24-hour snowfall measured in Bacau between 1940 and 2025 was 10 February 1984, with 31.9 cm.
Are there tropical nights in Bacau?
Yes: Bacau has on average 3 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bacau?
In Bacau, between 1940 and 2025, the highest apparent temperature reached 42.3 °C on 22 August 2000, and the lowest was -33.4 °C on 5 February 1950.
Compare Bacau with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bacau