426 



CORRELATION OF DISTRIBUTIONAL FEATURES 



Table 62. — Climatic extremes for region irith 1 to 7 species of a selected group of 13 deciduous 



trees of the eastern states. 



Plate 

 34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 43 

 44 

 45 



46 

 47 

 48 

 49 

 50 

 51 

 52 



53 

 54 



58 

 59 

 60 



63 



65 

 66 



68 



69 



70 

 71 



72 



Temperature: 



Days in normal frostless season (/s) 



Hot days, fs 



Cold days, fs 



Remainder summation ab ne 32°, year (thousands) . 



Remainder summation ab( ve 39°, fs (thousands) . . . 



Exponential summation, fs (hundreds) 



Physiological summauon, fs (thousands) 



Absolute minimum 



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



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



Normal daily mean, year (°F.) 



Precipitation: 



Normal daily mean, fs (inch) 



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



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



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



Days in longest normal rainy period, fs 



Days in longest normal dry period, fs 



Mean total, year (inches) 



Evaporation: 



Daily mean, 1887-88, fs (inch) 



Total annual, 188-788 (inches) 



Moisture ratios: 



Normal P/E, fs 



Normal tt/E, fs 



Normal P/E, year 



Vapor pressure: 



Normal mean, fs (hundredths inch) 



Humidity: 



Normal mean, fs (per cent) 



Normal mean, year (per cent) 



Wind: 



Normal mean hourly velocity, fs (miles) 



Sunshine: 



Normal total duration, fs (hours) 



Moisture-temperature indices: 



Normal P/E X T, fs, remainder method 



Normal P/E X T, fs, exponential method 



Normal P/E X T, fs, physiological method 



Low. 

 85 









 10.0- 



2.6 



3. 



2. 

 -59 





 64. 

 35 



4- 



.077 

 13 

 28 

 8 

 14 

 11 

 20- 



.084 

 22.1 



.39 

 .43 

 .38 



322 



53.2 

 59.8 



5.1 



1,225 



179 



.711 

 ,747 



High. 



335 



226 



150 

 26.0 + 

 10.6 

 11.7 

 21.4 

 +22 

 57 



78.8 + 

 70 + 



.172 



284 



259 

 92 



235 

 88 

 60 + 



.188 

 54.4 



1.36 

 1.52 

 1.72 



675 



81.9 

 85.2 



12.4 



2,650 



1,314 

 12,106 

 23,652 



Table 63. — Climatic extremes for region with 8 to 12 species of a selected group of IS deciduous 



trees of the eastern states. 



Plate 

 34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 43 

 44 

 45 



46 

 47 

 48 

 49 

 50 

 61 

 52 



Temperature: 



Days in normal frostless season (fs) 



Hot days, fs 



Cold days, fs 



Remainder summation above 32°, year (thousands) 



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



Exponential summation, fs (hundreds) 



Physiological summation, fs (thousands) 



Absolute minimum 



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



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



Normal daily mean, year (°F.) 



Precipitation: 



Normal daily mean, fs (inch) 



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



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



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



Days in longest normal rainy period, fs 



Days in longest normal dry period, fs 



Mean total, year (inches) 



Low. 

 112 









 10.0- 



2.9 



3.0 



4.4 

 -44 

 11 



64.4- 

 45- 



.089 



26 









 17 





 30- 



High. 

 262 

 172 

 137 

 18.0 + 

 8.4 

 9.2 

 17.0 

 + 12 

 48 



78.8 + 

 65 + 



.170 

 256 

 154 



83 

 256 

 91 

 50 + 



