Although far from the coast has a strong oceanic influence combined with altitude. The average annual temperature is 63.5 °F (17.5 °C). Winters are cold to their latitude, but are generally mild to be considered temperate as the true ocean climates. The average temperature in the winter (July) is from 56.7 °F (13.7 °C) and in the summer (January) is from 70.5 °F (21.4 °C), a high temperature average relatively low for the location. In the plant hardiness of the USDA the city is in zone 9b in almost your totality, in the same zone that the Central Florida by which it allows the growth of the genus Pinus, among other subtropical species. The various valleys are important to create microclimates with different temperatures and humidity. Heat islands can occur in the Downtown and Santa Paula (besides the urban density is associated too with the predominant direction of slopes). According to data from the National Institute of Meteorology (INMET), Brazilian institute, referring to the period from 1961 to 1973 (until 28 February), the lowest temperature recorded in Ponta Grossa was 21.7 °F (−5.7 °C) on 9 June 1967, and the highest reached 94.5 °F (34.7 °C) on 3 November 1968. The largest accumulated precipitation in 24 hours was 5.1' (130.5 mm) on 13 February 1966. Other large accumulations were 4.4' (110.9 mm) on 6 May 1970 and 3.9' (100 mm) on 4 July 1965. The lowest relative humidity was recorded in the afternoon of 9 June 1967, at 14%. Other years recorded were 1975 and 1981. Usually can stay up to 20 years without the occurrence, other times the interval may be 2 years. Frosts are the most common winter event, about 5 annual freezes. August and July are the driest months due to the cold and dry polar air mass advance. January and February are the most humid due to the humidity that advances from the tropical Atlantic, in addition to the evaporation itself in hot periods generating the short and fast convective rains. However, on average the relative humidity of the air is always high. The number of sunshine hours does not change much during seasons. Tornados and cyclones are rare and there is no history of at least great damage since the beginning of occupation, fortunately. Although there are amateur videos that detected the presence of tornado on 19 December 2010. The fog is a common winter