190 



THE CLIMATE OF PRINCE GEORGE S COUNTY 



The U. S. Weather Bureau observations at the regular stations 

 are made at 8 a. m. and 8 p. ni., 75th meridian time, and include 

 the readings of the barometer, thermometers (exposed, maximum and 

 minimum), raingage, velocity and direction of the wind and the 

 state of the weather. At voluntary, or cooperative stations, the 

 Smithsonian system was continued until 1888 and then for a few 

 years the observations were made at 8 a. m. and 8 p. m. Later the 

 exposed thermometers w^ere replaced by maximum and minimum 

 thermometers which are read but once each day, usually late in the 

 afternoon. 



In the Maryland State Weather Service each station is equipped 

 with a maximum and minimum thermometer and a raingage which 

 are read once each day, the observer also noting direction of wind 

 and state of weather. 



In the tables whicli follow the monthly and the annual extremes 

 are printed in heavy t}'pe instead of repeating them as a separate 

 item. Letters appearing in the tables indicate the number of days 

 missing from the original record for that month. Thus a, one day ; 

 h, two days, etc. 



TABLE I. 

 Meteorokogical Stations, Prince George's Coixtv, Mn. 



