| Table 3. Climatic data for Pinus edulis (pinyon pine, n=379). [Moisture index (MI) equals actual evaporation (AE) divided by potential evaporation (PE)] | |||||||
| Variable | Cumulative percentage of grid points | ||||||
|---|---|---|---|---|---|---|---|
| 0% | 10% | 25% | 50% | 75% | 90% | 100% | |
| Mean January temperature (°C) | -11.4 | -6.6 | -4.2 | -2.0 | 0.5 | 2.4 | 5.8 |
| Mean July temperature (°C) | 11.2 | 17.9 | 19.6 | 21.2 | 22.6 | 24.2 | 30.3 |
| Mean annual temperature (°C) | -0.6 | 5.9 | 7.7 | 9.3 | 10.8 | 12.5 | 17.8 |
| Mean temperature of coldest month (MTCO) | -11.4 | -6.6 | -4.2 | -2.0 | 0.5 | 2.3 | 5.7 |
| Growing degree days on 5°C base x 1,000 (GDD5) | 0.4 | 1.5 | 1.9 | 2.2 | 2.5 | 2.9 | 4.0 |
| Mean January precipitation (mm) | 5 | 10 | 14 | 21 | 32 | 44 | 98 |
| Mean July precipitation (mm) | 13 | 20 | 28 | 43 | 60 | 73 | 109 |
| Mean annual precipitation (mm) | 135 | 220 | 275 | 320 | 395 | 460 | 830 |
| Moisture index | 0.17 | 0.29 | 0.37 | 0.46 | 0.57 | 0.68 | 0.92 |
| 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 flexilis | Pinus ponderosa | Pinus edulis | Pinus engelmannii | Pinus banksiana | Pinus resinosa | Pinus rigida | Pinus serotina | Pinus clausa | |
| Number (n) | 374 | 1,138 | 379 | 222 | 4,718 | 1,751 | 711 | 462 | 82 |
| Mean January temperature (°C) | -9.3 | -3.0 | -2.0 | 7.5 | -21.5 | -12.4 | -1.4 | 8.7 | 15.8 |
| Mean July temperature (°C) | 13.9 | 18.7 | 21.2 | 21.3 | 16.0 | 18.5 | 22.1 | 27.0 | 27.4 |
| Mean annual temperature (°C) | 1.9 | 7.5 | 9.3 | 15.1 | -0.9 | 4.1 | 10.8 | 18.3 | 22.1 |
| Mean temperature of coldest month (°C) | -9.3 | -3.0 | -2.0 | 7.4 | -21.5 | -12.4 | -1.4 | 8.7 | 15.8 |
| Growing degree days on a 5°C base x 1,000 | 0.8 | 1.7 | 2.2 | 4.0 | 1.1 | 1.6 | 2.6 | 4.9 | 6.3 |
| Mean January precipitation (mm) | 52 | 46 | 21 | 16 | 27 | 61 | 83 | 95 | 58 |
| Mean July precipitation (mm) | 41 | 34 | 43 | 157 | 84 | 93 | 106 | 156 | 199 |
| Mean annual precipitation (mm) | 595 | 530 | 320 | 605 | 615 | 880 | 1,085 | 1,250 | 1,320 |
| Moisture index | 0.70 | 0.64 | 0.46 | 0.77 | 0.92 | 0.98 | 0.97 | 0.99 | 0.99 |
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