Table 1. Climate predictor variables used in nonparametric multiplicative regression (NPMR) analysis for ponderosa pine varieties and haplotypes.
| Acronym | Definition* |
|---|---|
| LogMAP | Log10 of mean annual precipitation (MAP) |
| LogGSP | Log10 of mean growing season precipitation (GSP); Apr–Sep |
| MTCM | Mean temperature in the coldest month |
| MTWM | Mean temperature in the warmest month |
| SUMP | Jul–Aug precipitation |
| WINP | Nov–Feb precipitation |
| MMINDD0 | Mean minimum degree-days < 0°C |
| DD5 | Degree-days > 5°C |
| GSDD5 | Degree-days > 5°C accumulating in frost-free period |
| SDAY | Julian date of the last freezing date of spring |
| PRATIO | GSP/MAP |
| SDI | Summer moisture index—(√GSDD5)/GSP |
| SMRPB | Summer precipitation balance: (Jul+Aug+Sep)/(Apr+May+Jun) |
| SHMI | Summer heat:moisture index—MTWM/Log(Jul-Sept precip) |
| TDIFF/LogGSP | (MTWM—MTCM)/(LogGSP) |
*Temperature is °C and precipitation is mm.