. The climate and weather of Baltimore . st and lowesttemperatures, this is the most desirable system to adopt. The UnitedStates Weather Bureau maintains an organization of about 3500 co-operating voluntary observers, all reporting daily maximum and minimumtemperatures. The Hourly Eate of Change. While the temperature increases steadily from sunrise to about 3 p. then steadily decreases to sunrise, the rate of warming and cooling 74 THE CLIMATI-; OK BALTrMOUE has its own period which ditters from that of the temperature temjaerature rises most rapidly from 8 a. m. to 10 a. m.,
. The climate and weather of Baltimore . st and lowesttemperatures, this is the most desirable system to adopt. The UnitedStates Weather Bureau maintains an organization of about 3500 co-operating voluntary observers, all reporting daily maximum and minimumtemperatures. The Hourly Eate of Change. While the temperature increases steadily from sunrise to about 3 p. then steadily decreases to sunrise, the rate of warming and cooling 74 THE CLIMATI-; OK BALTrMOUE has its own period which ditters from that of the temperature temjaerature rises most rapidly from 8 a. m. to 10 a. m., dependingupon the season of the year, and falls most rapidly from 6 p. m. to 7 p hours of least change coincide with those in which the maximumand minimum temperatures of the day occur. In selecting a combinationof honrs for observation it is important to bear in mind this varying rateof change, and to avoid as far as practicable the hours of maximum of this point is of no consequence when maximum and 9 10 M Mo. Fig. 16. — Hourly Rate of Change of Temperature. Fiif. In shows the extent of change in the temperature from hour to hour throughout theday and year. The values are ba?ed on hourly records during a period of ten years. Thehoui s of the day are indicated by the upper horizontal line of figures, and the months of theyear by the marginal letters. Tlte areas without shading show the time of daj when thechange in temperature is least, the heavy black line within this area marking the time ofchange from falling to rising, or rising to falling temperature. The areas with darkestshading show the time of most rapid change. A falling temperature is designated by aminus sign, a rising by absence of sign, before the figure representing the amount of changein degrees and tenths. The dotted lines marked and show the time of sunrise andsunset. The time of most rapid rise in the temperature is between 8 a. m. and 9 a. m., of most rapid fal
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