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MASS. EXPERIMENT STATION BULLETIN 367 



Mean Relative Humidity* 



•Mean relative humidity records are based on reading.s taken at 7 a.m., 2 p.m. and 9 p.m. from 

 1889 to 1003; and at 8 a.m. and 8 p.m. from 1004 to 1928. From 1929 to 1938 they are based on 

 readings taken at 8 a.m., noon, and 8 p.m. The means are based on the last 10 years. 



