Daily Observations at Hyslop Exp. Stn., Corvallis
January 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 | 52 | 42 | .09 | 52 | 45 | 48 | 44 | 18 | 0 | 0 | |
| 2 | 54 | 43 | .02 | 46 | 45 | 46 | 45 | 16 | 0 | 0 | |
| 3 | 56 | 43 | .78 | 49 | 46 | 47 | 45 | 15 | 0 | 0 | |
| 4 | 55 | 47 | .85 | 52 | 47 | 48 | 45 | 14 | 0 | 1 | |
| 5 | 58 | 35 | .34 | 54 | 42 | 51 | 42 | 18 | 0 | 0 | |
| 6 | 49 | 30 | .02 | 50 | 40 | 47 | 42 | 25 | 0 | 0 | |
| 7 | 45 | 28 | .02 | 47 | 38 | 46 | 38 | 28 | 0 | 0 | |
| 8 | 39 | 27 | 0 | 44 | 38 | 43 | 39 | 32 | 0 | 0 | |
| 9 | 39 | 26 | T | 43 | 37 | 42 | 38 | 32 | 0 | 0 | |
| 10 | 41 | 28 | .02 | 42 | 36 | 41 | 38 | 30 | 0 | 0 | |
| 11 | 47 | 28 | .02 | 44 | 37 | 42 | 38 | 27 | 0 | 0 | |
| 12 | 43 | 37 | .43 | 43 | 38 | 41 | 39 | 25 | 0 | 0 | |
| 13 | 50 | 37 | .62 | 46 | 42 | 44 | 42 | 21 | 0 | 0 | |
| 14 | 49 | 38 | .41 | 46 | 44 | 46 | 44 | 21 | 0 | 0 | |
| 15 | 48 | 33 | 0 | 49 | 42 | 47 | 44 | 24 | 0 | 0 | |
| 16 | 48 | 30 | 0 | 48 | 38 | 46 | 40 | 26 | 0 | 0 | |
| 17 | 52 | 31 | .01 | 48 | 37 | 46 | 39 | 23 | 0 | 0 | |
| 18 | 53 | 32 | 0 | 49 | 37 | 46 | 39 | 22 | 0 | 0 | |
| 19 | 51 | 30 | 0 | 48 | 35 | 46 | 36 | 24 | 0 | 0 | |
| 20 | 48 | 31 | T | 48 | 36 | 45 | 38 | 25 | 0 | 0 | |
| 21 | 44 | 34 | .03 | 46 | 39 | 43 | 40 | 26 | 0 | 0 | |
| 22 | 51 | 38 | .24 | 48 | 40 | 46 | 41 | 20 | 0 | 0 | |
| 23 | 54 | 39 | .22 | 49 | 42 | 47 | 44 | 18 | 0 | 0 | |
| 24 | 61 | 39 | .13 | 56 | 42 | 51 | 43 | 15 | 0 | 0 | |
| 25 | 55 | 48 | .18 | 53 | 48 | 50 | 48 | 13 | 0 | 2 | |
| 26 | 59 | 51 | .49 | 55 | 50 | 52 | 48 | 10 | 0 | 5 | |
| 27 | 58 | 43 | .21 | 58 | 48 | 55 | 50 | 14 | 0 | 1 | |
| 28 | 57 | 41 | .03 | 58 | 47 | 53 | 48 | 16 | 0 | 0 | |
| 29 | 50 | 42 | .19 | 52 | 48 | 50 | 48 | 19 | 0 | 0 | |
| 30 | 55 | 44 | 1.64 | 50 | 47 | 49 | 44 | 15 | 0 | 0 | |
| 31 | 60 | 52 | .23 | 56 | 48 | 53 | 47 | 9 | 0 | 6 | |
| Average/Total | 51.0 | 37.0 | 7.22 | 49.3 | 41.9 | 47.0 | 42.5 | 641 | 0 | 15 | 0.000 |
| Departure | 5.5 | 4.0 | 0.40 |   |   |   |   |   |   |   |   |