Climate

TOEF is located in the subarctic pluvial zone ("Df" in Koppen's climate province). The mean annual temperature is 6.5'. The maximum and minimum temperature in a year is 28 and -28'. The mean monthly temperature ranges from 19.1 to -3.2'. Kira's warmth index is 55' month. It is relatively cool and damp in summer compared to other regions in Hokkaido. The annual precipitation is about 1,200 mm. Seventy percent of the whole precipitation concentrates to summer season, which decrease the sunshine time to the halves compared to other seasons. The average maximum snow depth is 20-50 cm. The maximum freeze depth reaches 30cm in the forest and 70 cm on bare grounds.

The air temperature in TOEF tends to be lower than in the urban part of Tomakomai city throughout a year. The lowest temperature is at least 10' lower than that in the urban part, and the snow cover is also thicker. The winds tend to blow from south in May-August and from north in September -April. As TOEF is located near (about 51cm) seacoast, the southern wind from the sea in summer brings salty water which possibility eases some extent of damaged against trees. Through a year, we often have southeast wind at daytime and northwest at nighttime.