Water Resources Data System & State Climate Office
Water Resources Data System & State Climate Office
Water Resources Data System & State Climate Office



| Basin Click to View Chart | Date | Today SWE (inches) | Today SWE % of Median | Minimum SWE (in) | 10th Percentile (inches) | 30th Percentile Inches | Median (inches) | 70th Percentile (inches) | 90th Percentile (inches) | Maximum (inches) | Last Year SWE (inches) | Last Year SWE % of Median |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Belle Fourche | 31 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 0.00 | 0 |
| Bighorn | 31 May 2026 | 0.00 | 0 | 0.10 | 1.18 | 2.21 | 2.98 | 6.46 | 8.46 | 17.95 | 3.12 | 105 |
| Cheyenne | 31 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.05 | 0.00 | 0 |
| Laramie | 31 May 2026 | 0.00 | 0 | 0.00 | 0.05 | 1.34 | 2.80 | 7.60 | 11.06 | 20.32 | 1.19 | 42 |
| Little Snake | 31 May 2026 | 0.00 | 0 | 0.20 | 1.25 | 2.83 | 4.58 | 7.02 | 10.11 | 22.21 | 2.52 | 55 |
| Lower Green | 31 May 2026 | 0.00 | 0 | 0.00 | 0.28 | 1.06 | 2.07 | 3.96 | 5.51 | 14.05 | 0.88 | 43 |
| Lower North Platte | 31 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0.00 | 0.48 | 3.62 | 15.80 | 0.00 | 0 |
| Madison | 31 May 2026 | 0.00 | 0 | 0.00 | 0.79 | 5.15 | 7.24 | 9.06 | 16.34 | 22.68 | 2.74 | 38 |
| Powder | 31 May 2026 | 0.00 | 0 | 0.00 | 0.02 | 0.40 | 0.89 | 3.04 | 5.96 | 14.77 | 0.86 | 97 |
| Shoshone | 31 May 2026 | 0.00 | 0 | 0.17 | 2.54 | 5.11 | 7.73 | 13.20 | 19.68 | 24.72 | 4.25 | 55 |
| Snake | 31 May 2026 | 0.00 | 0 | 0.23 | 1.70 | 4.17 | 7.14 | 9.70 | 16.39 | 27.63 | 4.88 | 68 |
| South Platte | 31 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0 |
| Sweetwater | 31 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.23 | 1.70 | 5.18 | 16.46 | 19.20 | 0.27 | 16 |
| Tongue | 31 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.78 | 1.67 | 5.20 | 9.64 | 18.44 | 1.97 | 118 |
| Upper Bear | 31 May 2026 | 0.00 | 0 | 0.00 | 0.17 | 1.14 | 2.29 | 5.52 | 9.92 | 23.52 | 1.16 | 51 |
| Upper Green | 31 May 2026 | 0.00 | 0 | 0.00 | 0.27 | 2.56 | 3.54 | 5.13 | 12.83 | 19.03 | 2.59 | 73 |
| Upper North Platte | 31 May 2026 | 0.00 | 0 | 1.11 | 4.05 | 7.01 | 9.89 | 14.85 | 19.39 | 35.68 | 7.06 | 71 |
| Wind | 31 May 2026 | 0.00 | 0 | 0.13 | 1.26 | 2.65 | 3.56 | 6.59 | 13.76 | 18.72 | 1.74 | 49 |
| Yellowstone | 31 May 2026 | 0.00 | 0 | 1.07 | 5.22 | 9.14 | 12.36 | 15.97 | 20.24 | 29.42 | 8.87 | 72 |