Why does it always rain in Madrid in winter?

Because of the influence of the Mediterranean monsoon climate, Madrid is wetter in winter than other places.

The Mediterranean climate is characterized by hot and dry summer, high temperature and little rain, and mild and rainy winter. The temperature is 5℃ ~ 10℃ in winter and 2 1℃ ~ 27℃ in summer. The annual precipitation is about 350 mm ~ 900 mm, concentrated in winter. The precipitation in the second half of the year only accounts for 20% ~ 40% of the annual precipitation, and the maximum monthly precipitation is more than twice the minimum monthly precipitation. In summer, the wind belt of the pressure belt moves northward, and under the control of the subtropical high, the airflow sinks and there is little rain. In winter, the wind belt of the pressure belt moves south, and is influenced by the prevailing westerly wind from the ocean, with abundant precipitation and mild and humid climate.