Basti's climate is more equable than that of the adjoining districts to the south. The year may be divided into four seasons. Winter, from mid-November to February, is followed by summer, which lasts until approximately the middle of June. The period from mid-June to the end of September is the southwest monsoon season, and October to mid-November is the post-monsoon or transition period.
Cloudiness:- During the monsoon season, and for brief spells of a day or two in winter, heavily clouded or overcast skies prevail. During the rest of the year the skies are mostly clear or lightly clouded.
Rainfall:- The average annual rainfall of the district is 1166 mm.
Temperature:- During the winter season the mean minimum temperature is about 9°C and the mean maximum temperature 23°C. During the summer, the mean minimum is about 25°C and the mean maximum about 44°C.
Humidity:- In the southwest monsoon and post-monsoon seasons the relative humidity is above 70%. Thereafter the humidity decreases, and in the summer the air is very dry.
Winds:- The winds are in general very light, with a slight increase during the late summer and monsoon seasons. The average annual wind speed ranges from 2.0 to 7.1 km/h.
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