Edited sentence: A popular pastime is ice-fishing, whereby fishermen drill holes in the ice and fish with baited hooks.Night-life in Vilnius is in full swing at this time of year, and outdoor bars, restaurants and cafés become very popular during the daytime.Summers can be hot, with temperatures above thirty degrees Celsius throughout the day.Temperature records have been kept since 1777.The average annual temperature is +6.1 °C (43 °F); in January the average temperature is −4.9 °C (23 °F), in July it is +17.0 °C (62.6 °F).The average precipitation is about 661 millimetres (26.0 in) per year.The climate of Vilnius is considered Humid Continental or Hemiboreal by the Köppen climate classification.Vilnius's rivers freeze over in particularly cold winters, and the lakes surrounding the city are almost always permanently frozen during this time of year.Winters can be very cold, with temperatures rarely reaching above freezing — temperatures below negative 25 degrees Celsius (-13 °F) are not unheard-of in January and February