Climate: Belgium has a temperate, maritime climate predominantly influenced by air masses from the Atlantic. Rapid and frequent alternation of different air masses separated by fronts gives Belgium considerable variability in weather. In the coastal region, the climate is mild and humid, on the seacoast there are a few hot days, here the annual rainfall is the lowest in the country. There are marked temperature changes farther inland. In the high southeasterly districts, hot summers alternate with very cold winters. Good season usually from April until October and snow likely during winter months. The average annual temperature is 8°C; in Brussels, the mean temperature is 10°C, ranging from 3°C in January to 18°C in July.

Frontal conditions moving from the west produce heavy and frequent rainfall, average annual rainfall is between 700 and 1000 mm. Winters are damp and cool with frequent fogs; summers are rather mild. Regional climatic differences are determined by elevation and distance inland. Farther inland, maritime influences become weaker, and the climate becomes more continental, characterized by greater seasonal extremes of temperature. The Ardennes region, the highest and farthest inland, is the coldest. In winter, frost occurs on about 120 days, snow falls on 30 to 35 days, and January mean minimum temperatures are lower than elsewhere. Because of the topography, the Ardennes region has the highest rainfall in Belgium. In contrast, the Flanders region enjoys generally higher temperatures throughout the year. Belgium average rain fall is 852 mm a year.