Daily Observations at Hyslop Exp. Stn., Corvallis
December 2008
Bold = new daily record set (old record, year)
| Day | Max Temp (F) | Min Temp (F) | Precip (in) | Snow (in) | 2 in soil Max | 2 in soil Min | 4 in soil Max | 4 in soil Min | Heating Deg. Days | Cooling Deg. Days | Growing Deg. Days | Evaporation (in.) |
| 1 | 53 | 42 | 0.01 | 0 | 53 | 49 | 52 | 50 | 17 | 0 | 0 | 0 |
| 2 | 56 | 42 | 0.25 | 0 | 52 | 49 | 51 | 50 | 16 | 0 | 0 | 0 |
| 3 | 57 | 41 | 0.01 | 0 | 55 | 48 | 53 | 49 | 16 | 0 | 0 | 0 |
| 4 | 49 | 35 | T | 0 | 53 | 42 | 51 | 46 | 23 | 0 | 0 | 0 |
| 5 | 51 | 28 | 0 | 0 | 49 | 37 | 48 | 41 | 25 | 0 | 0 | 0 |
| 6 | 50 | 28 | 0 | 0 | 49 | 37 | 46 | 38 | 26 | 0 | 0 | 0 |
| 7 | 56 | 30 | 0.01 | 0 | 50 | 36 | 47 | 38 | 22 | 0 | 0 | 0 |
| 8 | 47 | 35 | 0.02 | 0 | 45 | 41 | 44 | 41 | 24 | 0 | 0 | 0 |
| 9 | 51 | 30 | 0.01 | 0 | 49 | 38 | 46 | 42 | 24 | 0 | 0 | 0 |
| 10 | 40 | 33 | T | 0 | 44 | 39 | 43 | 41 | 28 | 0 | 0 | 0 |
| 11 | 50 | 34 | 0 | 0 | 51 | 40 | 46 | 41 | 23 | 0 | 0 | 0 |
| 12 | 50 | 30 | 0.01 | 0 | 47 | 39 | 46 | 42 | 25 | 0 | 0 | 0 |
| 13 | 47 | 33 | 0.66 | 0 | 43 | 38 | 43 | 40 | 25 | 0 | 0 | 0 |
| 14 | 40 | 31 | 0.24 | 0.5 | 41 | 36 | 40 | 37 | 29 | 0 | 0 | 0 |
| 15 | 41 | 21 | 0.05 | 1.75 | 42 | 33 | 40 | 34 | 34 | 0 | 0 | 0 |
| 16 | 27 | 19 | 0 | 0 | 35 | 33 | 37 | 35 | 42 | 0 | 0 | 0 |
| 17 | 29 | 11 | 0 | 0 | 35 | 34 | 37 | 35 | 45 | 0 | 0 | 0 |
| 18 | 36 | 24 | 0.46 | 0 | 35 | 35 | 35 | 35 | 35 | 0 | 0 | 0 |
| 19 | 39 | 25 | 0.2 | 2.75 | 35 | 35 | 35 | 35 | 33 | 0 | 0 | 0 |
| 20 | 38 | 23 | 0.04 | T | 34 | 4 | 35 | 35 | 34 | 0 | 0 | 0 |
| 21 | 44 | 29 | 0.96 | 0 | 37 | 34 | 35 | 33 | 28 | 0 | 0 | 0 |
| 22 | 38 | 28 | 0.60 | 0 | 36 | 36 | 35 | 35 | 32 | 0 | 0 | 0 |
| 23 | 34 | 28 | 0.11 | 0 | 38 | 35 | 37 | 35 | 34 | 0 | 0 | 0 |
| 24 | 36 | 28 | 0.10 | T | 37 | 35 | 36 | 35 | 33 | 0 | 0 | 0 |
| 25 | 42 | 32 | 0.43 | 0 | 40 | 35 | 38 | 34 | 28 | 0 | 0 | 0 |
| 26 | 42 | 29 | T | 0 | 40 | 34 | 38 | 34 | 29 | 0 | 0 | 0 |
| 27 | 45 | 30 | 0.5 | 0 | 41 | 34 | 39 | 34 | 27 | 0 | 0 | 0 |
| 28 | 53 | 44 | 0.4 | 0 | 48 | 40 | 45 | 39 | 16 | 0 | 0 | 0 |
| 29 | 53 | 43 | 0.65 | 0 | 50 | 46 | 47 | 45 | 17 | 0 | 0 | 0 |
| 30 | 47 | 32 | 0.13 | 0 | 46 | 37 | 46 | 40 | 25 | 0 | 0 | 0 |
| 31 | 45 | 32 | 0.16 | 0 | 43 | 36 | 42 | 37 | 26 | 0 | 0 | 0 |
| Average/Total | 44.7 | 30.6 | 6.01 | 5.00 | 43.6 | 36.9 | 42.4 | 38.9 | 841 | 0 | 0 | 0.000 |
| Departure | -0.9 | -3.3 | -1.71 |   |   |   |   |   |   |   |   |   |