Daily Observations at Hyslop Exp. Stn., Corvallis
December 2003
Bold = new daily record set (old record, year)
| Day | Max Temp (F) | Min Temp (F) | Precip (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 | 48 | 42 | .12 | 49 | 47 | 49 | 47 | 20 | 0 | 0 | |
| 2 | 54 | 43 | .05 | 54 | 48 | 49 | 46 | 16 | 0 | 0 | |
| 3 | 55 | 36 | .32 | 53 | 46 | 51 | 48 | 19 | 0 | 0 | |
| 4 | 50 | 38 | .01 | 51 | 43 | 50 | 46 | 21 | 0 | 0 | |
| 5 | 49 | 37 | .71 | 47 | 43 | 46 | 43 | 22 | 0 | 0 | |
| 6 | 54 | 31 | .53 | 50 | 43 | 48 | 45 | 22 | 0 | 0 | |
| 7 | 50 | 34 | .44 | 50 | 43 | 48 | 43 | 23 | 0 | 0 | |
| 8 | 47 | 40 | .48 | 47 | 44 | 46 | 44 | 21 | 0 | 0 | |
| 9 | 50 | 38 | .01 | 51 | 44 | 48 | 44 | 21 | 0 | 0 | |
| 10 | 42 | 38 | .74 | 43 | 43 | 45 | 45 | 25 | 0 | 0 | |
| 11 | 48 | 39 | .02 | 47 | 42 | 46 | 42 | 21 | 0 | 0 | |
| 12 | 49 | 41 | .60 | 49 | 45 | 47 | 45 | 20 | 0 | 0 | |
| 13 | 53 | 45 | .93 | 50 | 46 | 48 | 44 | 16 | 0 | 0 | |
| 14 | 53 | 35 | 1.56 | 50 | 43 | 49 | 44 | 21 | 0 | 0 | |
| 15 | 45 | 33 | .18 | 46 | 39 | 44 | 41 | 26 | 0 | 0 | |
| 16 | 44 | 33 | T | 43 | 38 | 43 | 40 | 26 | 0 | 0 | |
| 17 | 50 | 40 | .10 | 44 | 40 | 43 | 40 | 20 | 0 | 0 | |
| 18 | 51 | 31 | .01 | 51 | 39 | 48 | 42 | 24 | 0 | 0 | |
| 19 | 44 | 32 | T | 46 | 38 | 44 | 40 | 27 | 0 | 0 | |
| 20 | 43 | 33 | .03 | 44 | 38 | 43 | 40 | 27 | 0 | 0 | |
| 21 | 53 | 39 | .02 | 51 | 43 | 46 | 42 | 19 | 0 | 0 | |
| 22 | 57 | 39 | .01 | 54 | 45 | 50 | 42 | 17 | 0 | 0 | |
| 23 | 46 | 32 | .01 | 47 | 41 | 47 | 43 | 26 | 0 | 0 | |
| 24 | 45 | 36 | .40 | 43 | 42 | 43 | 43 | 24 | 0 | 0 | |
| 25 | 47 | 38 | .57 | 45 | 43 | 44 | 43 | 22 | 0 | 0 | |
| 26 | 45 | 29 | .08 | 48 | 38 | 48 | 45 | 28 | 0 | 0 | |
| 27 | 42 | 32 | .28 | 43 | 38 | 42 | 38 | 28 | 0 | 0 | |
| 28 | 43 | 36 | .92 | 42 | 37 | 40 | 38 | 25 | 0 | 0 | |
| 29 | 44 | 32 | 1.90 | 43 | 37 | 43 | 40 | 27 | 0 | 0 | |
| 30 | 36 | 22 | T | 36 | 35 | 38 | 34 | 36 | 0 | 0 | |
| 31 | 36 | 23 | .20 | 36 | 33 | 37 | 33 | 35 | 0 | 0 | |
| Average/Total | 47.5 | 35.4 | 11.23 | 46.9 | 41.4 | 45.6 | 42.3 | 725 | 0 | 0 | 0.000 |
| Departure | 1.9 | 1.5 | 3.51 |   |   |   |   |   |   |   |   |