Daily Observations at Hyslop Exp. Stn., Corvallis
January 2004
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 | 42 | 32 | .40 | .75 | 35 | 35 | 36 | 34 | 28 | 0 | 0 | 0 |
| 2 | 36 | 30 | .65 | 2.0 | 35 | 35 | 40 | 35 | 32 | 0 | 0 | 0 |
| 3 | 38 | 31 | .22 | 0 | 35 | 34 | 36 | 34 | 30 | 0 | 0 | 0 |
| 4 | 38 | 31 | .37 | 0 | 34 | 34 | 35 | 33 | 30 | 0 | 0 | 0 |
| 5 | 38 | 20 | .02 | .50 | 34 | 34 | 35 | 33 | 36 | 0 | 0 | 0 |
| 6 | 25 | 18 | .20 | 2.5 | 35 | 35 | 35 | 30 | 43 | 0 | 0 | 0 |
| 7 | 33 | 19 | 1.05 | 0 | 35 | 33 | 35 | 34 | 39 | 0 | 0 | 0 |
| 8 | 38 | 31 | .27 | 0 | 33 | 33 | 34 | 33 | 30 | 0 | 0 | 0 |
| 9 | 40 | 32 | .16 | 0 | 33 | 33 | 34 | 34 | 29 | 0 | 0 | 0 |
| 10 | 39 | 31 | .13 | 0 | 33 | 33 | 34 | 34 | 30 | 0 | 0 | 0 |
| 11 | 43 | 32 | .01 | 0 | 37 | 32 | 36 | 33 | 27 | 0 | 0 | 0 |
| 12 | 45 | 30 | 0 | 0 | 45 | 36 | 42 | 35 | 27 | 0 | 0 | 0 |
| 13 | 42 | 31 | .05 | 0 | 40 | 36 | 38 | 35 | 28 | 0 | 0 | 0 |
| 14 | 50 | 34 | .02 | 0 | 49 | 37 | 49 | 36 | 23 | 0 | 0 | 0 |
| 15 | 49 | 42 | .18 | 0 | 46 | 43 | 45 | 42 | 19 | 0 | 0 | 0 |
| 16 | 54 | 41 | .05 | 0 | 51 | 46 | 47 | 44 | 17 | 0 | 0 | 0 |
| 17 | 46 | 43 | T | 0 | 48 | 46 | 46 | 44 | 20 | 0 | 0 | 0 |
| 18 | 48 | 43 | .35 | 0 | 48 | 46 | 46 | 43 | 19 | 0 | 0 | 0 |
| 19 | 55 | 40 | .26 | 0 | 54 | 46 | 49 | 45 | 17 | 0 | 0 | 0 |
| 20 | 55 | 37 | .07 | 0 | 57 | 44 | 51 | 44 | 19 | 0 | 0 | 0 |
| 21 | 48 | 30 | .02 | 0 | 49 | 38 | 47 | 42 | 26 | 0 | 0 | 0 |
| 22 | 44 | 30 | .01 | 0 | 46 | 37 | 44 | 39 | 28 | 0 | 0 | 0 |
| 23 | 48 | 35 | .19 | 0 | 48 | 40 | 46 | 40 | 23 | 0 | 0 | 0 |
| 24 | 50 | 40 | .29 | 0 | 48 | 45 | 47 | 44 | 20 | 0 | 0 | 0 |
| 25 | 46 | 34 | .21 | 0 | 47 | 39 | 46 | 42 | 25 | 0 | 0 | 0 |
| 26 | 46 | 37 | .07 | 0 | 46 | 38 | 43 | 38 | 23 | 0 | 0 | 0 |
| 27 | 48 | 41 | .47 | 0 | 46 | 42 | 44 | 42 | 20 | 0 | 0 | 0 |
| 28 | 53 | 42 | .23 | 0 | 51 | 44 | 47 | 43 | 17 | 0 | 0 | 0 |
| 29 | 52 | 46 | 1.10 | 0 | 50 | 46 | 48 | 44 | 16 | 0 | 0 | 0 |
| 30 | 54 | 40 | .80 | 0 | 52 | 46 | 50 | 47 | 18 | 0 | 0 | 0 |
| 31 | 48 | 34 | .15 | 0 | 50 | 40 | 47 | 42 | 24 | 0 | 0 | 0 |
| Average/Total | 44.9 | 34.1 | 8.00 | 5.75 | 43.5 | 38.9 | 42.3 | 38.6 | 783 | 0 | 0 | 0.000 |
| Departure | -0.6 | 1.1 | 1.18 |   |   |   |   |   |   |   |   |   |