Daily Observations at Hyslop Exp. Stn., Corvallis
February 2004
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 | 45 | 34 | .19 | 44 | 39 | 43 | 38 | 25 | 0 | 0 | |
| 2 | 45 | 37 | .14 | 48 | 42 | 46 | 42 | 24 | 0 | 0 | |
| 3 | 50 | 37 | .02 | 52 | 42 | 48 | 44 | 21 | 0 | 0 | |
| 4 | 49 | 35 | .03 | 51 | 41 | 48 | 42 | 23 | 0 | 0 | |
| 5 | 52 | 33 | .04 | 53 | 40 | 49 | 43 | 22 | 0 | 0 | |
| 6 | 47 | 35 | .08 | 50 | 40 | 47 | 42 | 24 | 0 | 0 | |
| 7 | 50 | 38 | .53 | 48 | 42 | 47 | 44 | 21 | 0 | 0 | |
| 8 | 51 | 30 | .05 | 52 | 39 | 48 | 41 | 24 | 0 | 0 | |
| 9 | 47 | 32 | .02 | 50 | 39 | 47 | 39 | 25 | 0 | 0 | |
| 10 | 47 | 27 | 0 | 48 | 38 | 46 | 40 | 28 | 0 | 0 | |
| 11 | 51 | 28 | T | 51 | 37 | 47 | 39 | 25 | 0 | 0 | |
| 12 | 59 | 29 | .01 | 53 | 37 | 48 | 39 | 21 | 0 | 0 | |
| 13 | 57 | 27 | 0 | 51 | 36 | 47 | 40 | 23 | 0 | 0 | |
| 14 | 43 | 27 | .25 | 41 | 36 | 41 | 37 | 30 | 0 | 0 | |
| 15 | 53 | 39 | .14 | 52 | 39 | 47 | 39 | 19 | 0 | 0 | |
| 16 | 58 | 42 | .47 | 55 | 41 | 51 | 42 | 15 | 0 | 0 | |
| 17 | 49 | 40 | .73 | 48 | 45 | 47 | 45 | 20 | 0 | 0 | |
| 18 | 50 | 43 | .44 | 49 | 44 | 47 | 44 | 18 | 0 | 0 | |
| 19 | 54 | 35 | .06 | 54 | 43 | 51 | 45 | 20 | 0 | 0 | |
| 20 | 54 | 34 | .01 | 57 | 39 | 53 | 42 | 21 | 0 | 0 | |
| 21 | 55 | 35 | 0 | 55 | 40 | 50 | 40 | 20 | 0 | 0 | |
| 22 | 53 | 41 | T | 55 | 40 | 50 | 40 | 18 | 0 | 0 | |
| 23 | 55 | 42 | .05 | 56 | 44 | 52 | 43 | 16 | 0 | 0 | |
| 24 | 58 | 42 | .30 | 63 | 47 | 56 | 46 | 15 | 0 | 0 | |
| 25 | 53 | 37 | .55 | 53 | 45 | 51 | 46 | 20 | 0 | 0 | |
| 26 | 54 | 39 | .33 | 56 | 45 | 51 | 44 | 18 | 0 | 0 | |
| 27 | 50 | 43 | .18 | 51 | 45 | 49 | 45 | 18 | 0 | 0 | |
| 28 | 52 | 39 | .3 | 53 | 46 | 49 | 44 | 19 | 0 | 0 | |
| 29 | 52 | 38 | .03 | 56 | 45 | 52 | 45 | 20 | 0 | 0 | |
| Average/Total | 51.5 | 35.8 | 4.95 | 51.9 | 41.2 | 48.6 | 42.1 | 613 | 0 | 0 | 0.000 |
| Departure | 1.1 | 0.7 | -0.09 |   |   |   |   |   |   |   |   |