Neerslag — 2026
| Month | Heiloo | Alkmaar | Difference |
|---|---|---|---|
| Jan | – | 86.9 mm | – |
| Feb | – | 60.9 mm | – |
| Mar | 5.6 mm | 30.2 mm | -24.6 |
| Apr | 2.3 mm | 1.9 mm | +0.4 |
| May | 49.5 mm | 38.6 mm | +10.9 |
| Jun | 100.9 mm | 86.8 mm | +14.1 |
| Jul | 14.5 mm | 13.2 mm | +1.3 |
| Aug |
| 93.6 mm |
| 86.8 mm |
| +6.8 |
| Sep | 90.6 mm | 99.9 mm | -9.3 |
| Oct | 124.6 mm | 119.7 mm | +4.9 |
| Nov | – | – | – |
| Dec | – | – | – |