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Climate — Barcelona: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 22°C | -4°C | 34 mm |
| February | 22°C | -4°C | 32 mm |
| March | 26°C | -4°C | 43 mm |
| April | 28°C | 2°C | 50 mm |
| May | 32°C | 3°C | 49 mm |
| June | 38°C | 9°C | 27 mm |
| July | 37°C | 12°C | 28 mm |
| August | 37°C | 12°C | 41 mm |
| September | 35°C | 8°C | 59 mm |
| October | 31°C | 3°C | 70 mm |
| November | 25°C | -1°C | 54 mm |
| December | 20°C | -3°C | 31 mm |
Long-term model averages for an area of about 50 km — not a forecast; mountains are often cooler. Source: NASA POWER Project (CC BY 4.0) (2001–2025)