Table 2.
Monthly precipitation isotope data and meteoric water line (MWL) slopes and statistics.
| Month | n | Mean δ18O | Mean δ 2H | Mean d-excess | Monthly MWL slope | r2† | % snow |
|---|---|---|---|---|---|---|---|
| Jan | 18 | -22.2 | -171 | 9.7∗ | 7.98 | 0.963 | 100 |
| Feb | 24 | -20.9 | -157 | 10.4 | 8.18 | 0.974 | 100 |
| Mar | 15 | -16.7 | -123 | 10.6 | 8.61 | 0.981 | 93 |
| Apr | 21 | -16.5 | -119 | 13.1 | 8.19 | 0.986 | 81 |
| May | 23 | -10.9 | -84 | 3.2 | 6.34 | 0.931 | 22 |
| June | 14 | -6.4 | -56 | -5.0 | 5.80 | 0.922 | 0 |
| July | 33 | -3.2 | -29 | -4.2 | 6.31 | 0.958 | 0 |
| Aug | 25 | -4.8 | -38 | 0.5 | 6.14 | 0.922 | 0 |
| Sept | 20 | -8.5 | -60 | 8.0 | 6.77 | 0.888 | 5 |
| Oct | 12 | -13.8 | -104 | 6.7 | 7.23 | 0.982 | 42 |
| Nov | 13 | -16.6 | -119 | 14.1 | 8.13 | 0.971 | 77 |
| Dec | 21 | -21.7 | -161 | 12.8 | 8.10 | 0.987 | 100 |
∗
Jan data has high skew so we use median d-excess for that month.
†
Regressions for all months have high significance (p < 0.0001).