|Lithuania has a humid continental climate (Dfb in the Koeppen climate classification). Average temperatures on the coast are −2.5 °C (27.5 °F) in January and 16 °C (60.8 °F) in July. In Vilnius the average temperatures are −6 °C (21 °F) in January and 16 °C (60.8 °F) in July. Simply speaking, 20 °C (68 °F) is frequent on summer days and 14 °C (57.2 °F) at night. Temperatures can reach 30 or 35 °C (86 or 95 °F) in summer. Some winters can be very cold. -20 °C occurs almost every winter. Winter extremes are −34 °C (−29 °F) in the seaside and −43 °C (−45 °F) in the east of Lithuania. The average annual precipitation is 800 millimetres (31.5 in) on the coast, 900 mm (35.4 in) in Samogitia highlands and 600 mm (23.6 in)in the eastern part of the country. Snow occurs every year, it can be snowing from October to April. In some years sleet can fall in September or May. The growing season lasts 202 days in the western part of the country and 169 days in the eastern part. Severe storms are rare in the eastern part of Lithuania and common in the seaside.
The longest measured temperature records from the Baltic area cover about 250 years. The data show that there were warm periods during the latter half of the 18th century, and that the 19th century was a relatively cool period. An early 20th century warming culminated in the 1930s, followed by a smaller cooling that lasted until the 1960s. A warming trend has persisted since then. (Source: Wikipedia)