Average Soil Temperature in Harlan, IA — December 2025
Data from Shagbark Hills (59.4 mi away) • 31 of 31 days reported
Monthly Summary by Depth
2" depth
34.1°F
avg
32°F – 40.3°F
31 days
4" depth
35°F
avg
32.9°F – 40.1°F
31 days
8" depth
36.8°F
avg
34.9°F – 39.9°F
31 days
20" depth
39.9°F
avg
37.9°F – 43°F
31 days
40" depth
46°F
avg
43.7°F – 49.8°F
31 days
Daily Readings
| Date | 2" | 4" | 8" | 20" | 40" |
|---|---|---|---|---|---|
| Dec 1 | 36°F | 36.9°F | 38.7°F | 43°F | 49.8°F |
| Dec 2 | 35.8°F | 36.9°F | 38.7°F | 42.8°F | 49.5°F |
| Dec 3 | 35.8°F | 36.7°F | 38.7°F | 42.4°F | 49.1°F |
| Dec 4 | 34°F | 35.4°F | 37.9°F | 42.3°F | 48.7°F |
| Dec 5 | 34.3°F | 35.6°F | 37.8°F | 41.7°F | 48.6°F |
| Dec 6 | 34.9°F | 36°F | 37.9°F | 41.4°F | 48.2°F |
| Dec 7 | 35.2°F | 36.1°F | 37.9°F | 41.4°F | 47.8°F |
| Dec 8 | 35.1°F | 36.1°F | 37.9°F | 41.2°F | 47.7°F |
| Dec 9 | 34.7°F | 35.8°F | 37.8°F | 41°F | 47.3°F |
| Dec 10 | 34.3°F | 35.2°F | 37.4°F | 40.8°F | 47.1°F |
| Dec 11 | 33.8°F | 34.9°F | 36.9°F | 40.6°F | 46.9°F |
| Dec 12 | 33.3°F | 34.5°F | 36.7°F | 40.3°F | 46.8°F |
| Dec 13 | 33.1°F | 34.2°F | 36.1°F | 39.2°F | 46.4°F |
| Dec 14 | 32.7°F | 34°F | 36°F | 39.2°F | 46.2°F |
| Dec 15 | 32.7°F | 34°F | 35.8°F | 39.4°F | 46°F |
| Dec 16 | 33.1°F | 34.2°F | 36°F | 39.2°F | 45.7°F |
| Dec 17 | 33.8°F | 34.5°F | 36°F | 39.2°F | 45.5°F |
| Dec 18 | 32.5°F | 33.6°F | 35.8°F | 39°F | 45.3°F |
| Dec 19 | 32°F | 33.1°F | 35.2°F | 38.7°F | 45.1°F |
| Dec 20 | 32.2°F | 32.9°F | 35.1°F | 38.5°F | 45°F |
| Dec 21 | 32°F | 32.9°F | 34.9°F | 38.1°F | 44.6°F |
| Dec 22 | 32.2°F | 32.9°F | 34.9°F | 37.9°F | 44.4°F |
| Dec 23 | 32.5°F | 33.4°F | 34.9°F | 37.9°F | 44.2°F |
| Dec 24 | 34.3°F | 35.1°F | 35.6°F | 37.9°F | 44.1°F |
| Dec 25 | 36.5°F | 36.7°F | 36.9°F | 38.1°F | 43.9°F |
| Dec 26 | 37.2°F | 37.6°F | 38.3°F | 38.8°F | 43.7°F |
| Dec 27 | 40.3°F | 40.1°F | 39.9°F | 39.4°F | 43.7°F |
| Dec 28 | 34.2°F | 35.6°F | 38.3°F | 40.1°F | 43.9°F |
| Dec 29 | 32.7°F | 34°F | 36.5°F | 39.7°F | 43.9°F |
| Dec 30 | 32.5°F | 33.4°F | 35.6°F | 39°F | 43.9°F |
| Dec 31 | 32.7°F | 33.6°F | 35.4°F | 38.7°F | 43.9°F |