Average Soil Temperature in Spearfish, SD — October 2025
Data from Sundance 8 NNW (28.4 mi away) • 31 of 31 days reported
Monthly Summary by Depth
2" depth
46.9°F
avg
38.1°F – 56.8°F
31 days
4" depth
46.8°F
avg
38.5°F – 56.5°F
31 days
8" depth
48.4°F
avg
41°F – 56.8°F
31 days
20" depth
50°F
avg
44.1°F – 55.8°F
31 days
40" depth
51.9°F
avg
47.3°F – 55.8°F
31 days
Daily Readings
| Date | 2" | 4" | 8" | 20" | 40" |
|---|---|---|---|---|---|
| Oct 1 | 56.8°F | 56.5°F | 56.8°F | 55.8°F | 55.8°F |
| Oct 2 | 56.3°F | 55.8°F | 56.3°F | 55.6°F | 55.8°F |
| Oct 3 | 56.8°F | 56.5°F | 56.3°F | 55.6°F | 55.6°F |
| Oct 4 | 54.7°F | 54.7°F | 55.8°F | 55.6°F | 55.6°F |
| Oct 5 | 49.8°F | 50°F | 53.1°F | 54.9°F | 55.6°F |
| Oct 6 | 48°F | 48°F | 50.9°F | 53.8°F | 55.2°F |
| Oct 7 | 47.1°F | 46.8°F | 49.5°F | 52.7°F | 54.7°F |
| Oct 8 | 49.3°F | 48.7°F | 50°F | 52°F | 54.1°F |
| Oct 9 | 50.2°F | 49.6°F | 50.5°F | 51.8°F | 53.8°F |
| Oct 10 | 50.4°F | 50°F | 50.9°F | 51.8°F | 53.4°F |
| Oct 11 | 52°F | 51.6°F | 51.6°F | 51.8°F | 53.2°F |
| Oct 12 | 49.6°F | 50°F | 51.6°F | 52°F | 53.1°F |
| Oct 13 | 45.9°F | 45.9°F | 48.9°F | 51.4°F | 52.9°F |
| Oct 14 | 47.7°F | 47.3°F | 48.6°F | 50.5°F | 52.7°F |
| Oct 15 | 49.8°F | 48.9°F | 49.5°F | 50.4°F | 52.3°F |
| Oct 16 | 48.2°F | 48.2°F | 49.6°F | 50.5°F | 52.2°F |
| Oct 17 | 46.6°F | 46.8°F | 48.6°F | 50.2°F | 52°F |
| Oct 18 | 44.6°F | 44.8°F | 47.5°F | 49.6°F | 51.8°F |
| Oct 19 | 43.7°F | 43.9°F | 46°F | 48.7°F | 51.4°F |
| Oct 20 | 43.2°F | 43.7°F | 46°F | 48.2°F | 50.9°F |
| Oct 21 | 42.1°F | 42.4°F | 44.8°F | 47.7°F | 50.4°F |
| Oct 22 | 41.7°F | 41.4°F | 44.1°F | 46.9°F | 49.8°F |
| Oct 23 | 43.2°F | 42.6°F | 44.2°F | 46.4°F | 49.5°F |
| Oct 24 | 43.2°F | 42.6°F | 44.2°F | 46.2°F | 49.1°F |
| Oct 25 | 45°F | 44.6°F | 45.1°F | 46.2°F | 48.7°F |
| Oct 26 | 46.2°F | 46°F | 46.2°F | 46.4°F | 48.6°F |
| Oct 27 | 43.5°F | 44.1°F | 45.7°F | 46.8°F | 48.6°F |
| Oct 28 | 41.4°F | 41.7°F | 44.1°F | 46.2°F | 48.4°F |
| Oct 29 | 39°F | 39.4°F | 42.3°F | 45.5°F | 48.2°F |
| Oct 30 | 38.8°F | 39.2°F | 41.5°F | 44.8°F | 47.8°F |
| Oct 31 | 38.1°F | 38.5°F | 41°F | 44.1°F | 47.3°F |