Valkenburg Naval Air Base is a former air base located just south of Valkenburg, which is part of Katwijk and close to the city of Leiden, that was used by the Royal Netherlands Navy up until 2006, being their base for the Lockheed P-3 Orion aircraft.

Climatology

Temperate Marine climate/Oceanic climate (Köppen climate classification Cfb). Moderately cool summer and comparatively warm winter with a temperature range of only 14°C. Prevailing south-westerly winds from the Atlantic Ocean.