spells occurring frequently. Snowfall is rare but not unheard of, with light snow or flurries occurring on some winters, generally without accumulation, and major snowfalls on a very rare occurrence (the most recent ones were in 2018, 2012 and 1986). The average relative humidity is 75%, varying from 72% in July to 77% in November. Sea temperatures vary from a low of in February to a high of in August. Demographics In 550 BC, Rome was the second largest city in Italy, with Tarentum being the largest. It had an area of about and an estimated population of 35,000. Other sources suggest the population was just under 100,000 from 600 to 500 BC. When the Republic was founded in 509 BC the census recorded a population of 130,000. The republic included the city itself and the immediate surroundings. Other sources suggest a population of 150,000 in 500 BC. It surpassed 300,000 in 150 BC. The size of the city at the time of the Emperor Augustus is a matter of speculation, with estimates based on grain distribution, grain imports, aqueduct capacity, city limits, population density, census reports, and assumptions about the number of unreported women, children and slaves providing a very wide range. Glenn Storey estimates 450,000 people, Whitney Oates estimates 1.2 million, Neville Morely provides a rough estimate of 800,000 and excludes earlier suggestions of 2 million. Estimates of the city's population towards and after the end of the Roman empire also vary. A.H.M. Jones estimated the population at 650,000 in the mid-fifth century. The damage caused by the sackings may have been overestimated. The population had already started to decline from the late fourth century onward, although around the middle of the fifth century it seems that Rome continued to be the most populous city of the two parts of the Empire. According to Krautheimer it was still close to 800,000 in 400 AD; had declined to 500,000 by 452, and dwindled to perhaps 100,000 in 500 AD. After the Gothic Wars, 535–552, the population may have dwindled temporarily to 30,000. During the pontificate of Pope Gregory I (590–604), it may have reached 90,000, augmented by refugees. Lancon estimates 500,000 based on the number of 'incisi' enrolled as eligible to receive bread, oil and wine rations; the number fell to 120,000 in the reform of 419. Neil Christie, citing free rations for the poorest, estimated 500,000 in the