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Summer
begins when the average temperature rises above 10 degrees, usually in the last week of May. The warmest month is normally July when the temperature is 20-25 degrees during the day and 10-15 degrees at night. Water temperature is over 20 degrees in lakes. The summer usually ends in the middle of September. We made the summer observations in the late summer in September when autumn was already on its way here. The average temperature sank below 10 degrees in this week and autumn had already begun.

Weather in Heinävesi on September 4-8, 2000

Day Min T ºC Max T ºC Rain
mm
Wind speed m/s W dir Cloud % Air press
Mon 4 10 15 2 2-4 N 100-20 low-high
Tue 5 5 12 0 0 NE 0-80 high
Wed 6 6 11 0 3-4 N 0-70 high
Thu 7 4 12 0 4-12 NE 30-50 high
Fri 8 4 11 2 5-8 S 100 low


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