1. Classification of JMA manned stations① ② ③ ④ ⑤
Number of stations 5 5 4 4 4
Class 4 4 5 4 3
Bad 3 3 3 2 2 2 3 3 4 1 1 2 1
As for temperature, when only the conditions of neighboring artificial surfaces were taken into account, the result of the classification for temperature measurement is that 37 out of 59 stations are categorized as Class 3, 17 stations as Class 4, two stations each as Class 2 and Class 5, and one station as Class 1. However, when the conditions of shading by neighboring obstacles were taken into consideration, only two stations fulfilled the requirements of Class 3 or better, while the majority falling into Class 4 or 5
Good
Exclude the conditions of roughness
Exclude the conditions of sun elevation angles

2. Discussion on classification for temperature
・The conditions for shading seem rather strict.
We assumed in the process of the rating that shade is not avoidable when there are any obstacles above the same angular height as the sun.
Better interpretation might be needed for properly estimating the effects of shading.
For example, thermometer screens/shields also have a big effect on temperature observation (see
publications/IOM-104_TECO-2010/P3_1_Aoshima_Japan.pdf). It is better to consider the difference of types of instruments for the assessment of the effects of solar radiation.
・The extent of immediate effects from artificial heat sources vary depending on wind conditions.
No mention about wind conditions in the classification. When the results of ratings utilized to climate study, the climatological wind in the neighborhood should also be taken into account.