Abstract
The wind velocity and air temperature were measured during January and March in 1992 at a windbreak forest around the farmhouse in the Sendai Plain, north Japan. Average wind velocity was 2.1m/s at the outside point and was 1.3m/s at the center of garden inside of the windbreak forest. Wind velocity difference between outside and inside of the forest was larger at night than in daytime. On the other hand, air temperature inside of windbreak forest is higher than the outside in daytime and lower than the outside at night. Difference of air temperature between inside and outside of the forest was larger in the days with strong wind than the days with weak wind.
In the daytime, the regional difference of air temperature increases inside of the forest. This large temperature difference brings unstable condition and the microscale circulation. Therefore, the fluctuations of wind velocity and air temperature increase at inside of the forest during daytime.
