U.S. Geological Survey

Climate-Vegetation Atlas of North America

Table 3. Climatic data for Pinus edulis (pinyon pine, n=379).
[Moisture index (MI) equals actual evaporation (AE) divided by potential evaporation (PE)]

VariableCumulative percentage of grid points
0%10%25%50%75%90%100%

Mean January temperature (°C)-11.4-6.6-4.2-2.00.52.45.8
Mean July temperature (°C)11.217.919.621.222.624.230.3
Mean annual temperature (°C)-0.65.97.79.310.812.517.8
Mean temperature of coldest month (MTCO)-11.4-6.6-4.2-2.00.52.35.7
Growing degree days on 5°C base x 1,000 (GDD5)0.41.51.92.22.52.94.0
 
Mean January precipitation (mm)5101421324498
Mean July precipitation (mm)132028436073109
Mean annual precipitation (mm)135220275320395460830
Moisture index0.170.290.370.460.570.680.92


Table 4. Comparison of median climatic tolerance values for nine pine species from across North America.
[Moisture index (MI) equals actual evaporation (AE) divided by potential evaporation (PE)]

 Pinus flexilisPinus ponderosaPinus edulisPinus engelmanniiPinus banksianaPinus resinosaPinus rigidaPinus serotinaPinus clausa

Number (n)3741,1383792224,7181,75171146282
 
Mean January temperature (°C)-9.3-3.0-2.07.5-21.5-12.4-1.48.7 15.8
Mean July temperature (°C)13.918.721.221.316.018.522.127.0 27.4
Mean annual temperature (°C)1.97.59.315.1-0.94.110.818.3 22.1
Mean temperature of coldest month (°C)-9.3-3.0-2.07.4-21.5-12.4-1.48.7 15.8
Growing degree days on a 5°C base x 1,0000.81.72.24.01.11.62.64.96.3
 
Mean January precipitation (mm)524621162761839558
Mean July precipitation (mm)4134431578493106156199
Mean annual precipitation (mm)5955303206056158801,0851,250 1,320
Moisture index0.700.640.460.770.920.980.970.990.99


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