Girona
Climate
### Climate

Girona has a humid Mediterranean climate. According to the [Köppen climate classification](/wiki/K%C3%B6ppen-Geiger_climate_classification_system "Köppen-Geiger climate classification system"), Girona has a [humid subtropical climate](/wiki/Humid_subtropical_climate "Humid subtropical climate") (*Cfa*) transitioning to a [Mediterranean climate](/wiki/Mediterranean_climate "Mediterranean climate") (*Csa*), with mild winters and hot summers. In winter, frost occurs frequently (41\.3 days per year from November to March), but snowfall is quite rare. Temperatures in winter can drop to below , especially during days with [thermal inversion](/wiki/Thermal_inversion "Thermal inversion"). Average annual rainfall is usually slightly above . The wettest seasons are autumn (September–November) and spring (April–early June). [Thunderstorms](/wiki/Thunderstorms "Thunderstorms") can occur throughout the year, more frequently in summer, averaging 23\.9 days per year. but usually there still is a significant arid period. This can be seen through the natural vegetation around the city, as drought\-tolerant oaks (*[Quercus ilex](/wiki/Quercus_ilex "Quercus ilex")* and, to a lesser extent, *[Quercus suber](/wiki/Quercus_suber "Quercus suber")* and *[Quercus pubescens](/wiki/Quercus_pubescens "Quercus pubescens")*) and pines (*[Pinus pinaster](/wiki/Pinus_pinaster "Pinus pinaster")*, *[Pinus pinea](/wiki/Pinus_pinea "Pinus pinea")* and *[Pinus halepensis](/wiki/Pinus_halepensis "Pinus halepensis")*) dominate the majority of the plant communities.


Can you explain the relationship between drought-tolerant vegetation and arid periods?