Netherlands · urban-centre population 70,132
Alphen aan den Rijn
Weather values are area-weighted across the 18 km² urban centre (2 ERA5 cells).
21.1
matching days / year for “Eternal spring” · 2021-2025 recent-weather sample (not a 30-year normal)
Monthly high (p10–p90)
Whiskers span the 10th–90th percentile daily high; the tick marks the monthly average.
- January: average 7°C, p10 3°C, p90 11°C
- February: average 8°C, p10 3°C, p90 11°C
- March: average 11°C, p10 6°C, p90 15°C
- April: average 12°C, p10 8°C, p90 17°C
- May: average 17°C, p10 13°C, p90 21°C
- June: average 21°C, p10 16°C, p90 26°C
- July: average 21°C, p10 18°C, p90 25°C
- August: average 22°C, p10 18°C, p90 26°C
- September: average 20°C, p10 15°C, p90 25°C
- October: average 15°C, p10 13°C, p90 19°C
- November: average 10°C, p10 6°C, p90 14°C
- December: average 8°C, p10 3°C, p90 11°C
Matching days by month · Eternal spring
- January: 0.0 matching days per year
- February: 0.0 matching days per year
- March: 0.8 matching days per year
- April: 1.2 matching days per year
- May: 3.2 matching days per year
- June: 7.2 matching days per year
- July: 3.3 matching days per year
- August: 2.9 matching days per year
- September: 2.2 matching days per year
- October: 0.3 matching days per year
- November: 0.0 matching days per year
- December: 0.0 matching days per year
Presets
- Eternal spring: 21.1 days/yr
- Mild and dry: 30.6 days/yr
- Beach weather: 15.2 days/yr
- Crisp and clear: 12.1 days/yr
- Warm, not sweaty: 43.1 days/yr