The climate varies between maritime and continental. Considering the suitability to human health and economy, the climate is claimed to be ideal. Average temperatures are −2.5 °C (27.5 °F) in January and 16 °C (61 °F) in July. In Vilnius the average temperatures are −6 °C (21 °F) in January and 17 °C (63 °F) in July. During the summer, 20 °C (68 °F) is common during the day but temperatures can reach as high as 30 or 35 °C (86 or 95 °F). Winters can be very cold. An average of −20 °C (−4 °F) occurs almost every winter. The average annual precipitation is 800 mm (31.5 in) on the coast, 900 mm (35.4 in) in the Samogitia highlands and 600 mm (23.6 in) in the eastern part of the country. Snow occurs every year; it can snow from October to April. In some years sleet can fall in September or May.