Rome enjoys a Mediterranean climate, typical of the Mediterranean coasts of Italy. Spring and autumn are mild to warm, and the Romans ottobrate ("beautiful October days") are known as being sunny and warm. By August, the maximum diurnal temperature often exceeds 30 °C (86°F).
Traditionally, many businesses were accustomed to closing during August, while Romans visited holiday resorts. In more recent years, however, in response to growing tourism and changing work habits, the city has been staying open for the whole summer. The average high temperature in January is about (55.2°F), but in hot periods it can be higher, while subzero lows are not uncommon. Snowfalls can occur in December, January and February. Within the last four decades they have been rare in Rome: the most recent snowfall with accumulation was in February 2010, the first since 1986 (in some peripheral areas since 1991); between 1986 and 2010 snow fell four times, without significant traces on the ground.
Generally – summer's season lasts about 6 months, from May to October. Two months (April and November) are transitional, sometimes there are temperature above 20 °C (68 °F). December, January, February and March are the coldest months, with average temperatures (of these four months) over 13.1 °C(55.6°F)near the city centre (13.9 °C(57.0°F) near sea) during the day and 3.7 °C(38.7°F)near the city center 4.7 °C(40.5°F) near sea) at night. The average relative humidity is 74.8%, varying from 72% in July to 77% in November and December.