438 



CORRELATION OF DISTRIBUTIONAL FEATURES. 



Table 80. — Climatic extremes for Pinus ponderosa. 



Plate Temperature: 



34 Days in normal frostless season (/s) 



35 Hot .days, fs 



36 Cold days, fs 



37 Remainder summation above 32°, year (thousands) . 



38 Remainder summation above 39°, fs (thousands) . . . 



39 Exponential summation, fs (hundreds) 



40 Physiological summation, fs (thousands) 



41 Absolute minimum 



43 Normal daily mean, coldest 14 days of year (°F.) . . 



44 Normal daily mean, hottest 6 weeks of year (°F.) . . 



45 Normal daily mean, year (°F.) 



Precipitation: 



46 Normal daily mean, fs (inch) 



47 Normal No. rainy days (over 0.10 inch), fs 



48 Normal No. dry days (0.10 inch or less), fs 



49 Dry days, percentage of total, fs (per cent) 



50 Days in longest normal rainy period, fs 



51 Days in longest normal dry period, fs 



62 Mean total, year (inches) 



Evaporation: 



53 Daily mean, 1887-88, fs (inch) 



54 Total annual, 1887-88 (inches) 



Moisture ratios: 



58 Normal P/E, fs 



59 Normal ir/E, fs 



60 Normal P/E, year 



Vapor pressure: 



63 Normal mean, fs (hundredths inch) 



Humidity: 



65 Normal mean, fs (per cent) 



66 Normal mean, year (per cent) 



Wind: 



68 Normal mean hourly velocity, fs (miles) 



Sunshine: 



69 Normal total duration, fs (hours) 



Moisture-temperature indices: 



70 Normal P/E X T, fs, remainder method 



71 Normal P/E X T, fs, exponential method 



72 Normal P/E X T, fs, physiological method 



Table 81. — Climatic extremes for Pinus contorta. 



Plate Temperature: 



34 Days in normal frostless season (Js) 



35 Hot d(ays, fs 



36 Cold days, fs 



37 Remainder summation above 32°, year (thousands) 



38 Remainder summation above 39°, fs (thousands) . . 



39 Exponential summation, fs (hundreds) 



40 Physiological summation, fs (thousands) 



41 Absolute minimum 



43 Normal daily mean, coldest 14 days of year (°F.) . , 



44 Normal daily mean, hottest 6 weeks of year (°F.) . 



45 Normal daily mean, year (°F.) 



Precipitation: 



46 Normal daily mean, fs (inch) 



47 Normal No. rainy days (over 0.10 inch), fs 



48 Normal No. dry days (0.10 inch or less), fs 



49 Dry days, percentage of total, fs (per cent) 



60 Days in longest normal rainy period, fs 



51 Days in longest normal dry period, fs 



52 Mean total, year (inches) 



