Cooling rate shows the highest as about 0.7$^{circ}C$/hr on spring season and the lowest as about 0.3$^{circ}C$/hr on september at plain place. The correlation coefficient between net radiation and cooling rate from sunrise to sunset was 0.63$^{**}$, It became higher to 0.90$^{**}$ when the wind speed decreased lower than 0.5 m/sec, and it decreased as the wind speed increased. On a clear and calm day, cooling rates were observed as 1.4$^{circ}C$/hr on the plain (site 1, 2, 3), 1.2$^{circ}C$/hr on the slope (site 4, 5) and 0.6$^{circ}C$/hr on the top of mountain (site 6). In condition of the wind speed is 1.2~2 m/sec on a clear and calm day and the temperature on the top of mountain is lower than that of slope and plain, the temperature on the slope (site 4,5) was increased unlike our expectation.ion.