Why is it das Winterwetter?

Winterwetter ends in -er. Most nouns with this ending are masculine (86% take der), but Winterwetter is an exception: das Winterwetter.

The other -er exceptions
Sense 1
das

Meaning

[1] Typical weather for winter

[1] für den Winter typisches Wetter

Examples

[1] "But the tourismists also need a little luck, namely the right winter weather area"

[1] „Aber dazu brauchen die Touristiker auch ein bißchen Glück, nämlich das richtige Winterwetter.“

[1] "In the south of France and in northern Italy, the winter weather sometimes kept ana until April"

[1] „In Südfrankreich und in Norditalien hielt das Winterwetter manchmal bis in den April an.“
More source examples (1)

These dictionary examples can include historical and less common uses.

[1] "In the rest of Bavaria, drivers were initially spared from winter weather"

[1] „Im restlichen Bayern blieben Autofahrer zunächst jedoch von Winterwetter verschont.“

Declension

1 Singular Plural
Nominativ das Winterwetter —
Genitiv des Winterwetters —
Dativ dem Winterwetter —
Akkusativ das Winterwetter —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary