Daily Observations at Hyslop Exp. Stn., Corvallis
April 2002
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 | 61 | 40 | 0 | 67 | 44 | 60 | 45 | 14 | 0 | 1 | .112 |
| 2 | 63 | 39 | 0 | 69 | 46 | 61 | 47 | 14 | 0 | 1 | .182 |
| 3 | 65 | 39 | 0 | 68 | 45 | 61 | 48 | 13 | 0 | 2 | .214 |
| 4 | 68 | 40 | 0 | 70 | 45 | 63 | 47 | 11 | 0 | 4 | .099 |
| 5 | 74 | 43 | T | 74 | 47 | 67 | 49 | 6 | 0 | 9 | .258 |
| 6 | 53 | 48 | .21 | 54 | 52 | 54 | 53 | 14 | 0 | 1 | .060 |
| 7 | 58 | 46 | .01 | 62 | 52 | 57 | 50 | 13 | 0 | 2 | .103 |
| 8 | 58 | 36 | 0 | 67 | 45 | 58 | 45 | 18 | 0 | 0 | .077 |
| 9 | 68 | 41 | .05 | 73 | 44 | 65 | 48 | 10 | 0 | 5 | .094 |
| 10 | 58 | 51 | .53 | 62 | 54 | 58 | 54 | 10 | 0 | 5 | .063 |
| 11 | 61 | 49 | .12 | 64 | 53 | 61 | 52 | 10 | 0 | 5 | .077 |
| 12 | 62 | 51 | .04 | 65 | 54 | 60 | 53 | 8 | 0 | 7 | .121 |
| 13 | 66 | 52 | .10 | 72 | 55 | 65 | 58 | 6 | 0 | 9 | .165 |
| 14 | 62 | 40 | .55 | 64 | 51 | 60 | 54 | 14 | 0 | 1 | .086 |
| 15 | 55 | 40 | .01 | 65 | 48 | 60 | 50 | 17 | 0 | 0 | .155 |
| 16 | 52 | 40 | .02 | 58 | 46 | 56 | 48 | 19 | 0 | 0 | .022 |
| 17 | 52 | 39 | .10 | 56 | 47 | 53 | 47 | 19 | 0 | 0 | .172 |
| 18 | 52 | 37 | .03 | 60 | 46 | 55 | 46 | 20 | 0 | 0 | .054 |
| 19 | 57 | 33 | 0 | 65 | 45 | 60 | 48 | 20 | 0 | 0 | .006 |
| 20 | 59 | 38 | T | 71 | 46 | 62 | 46 | 16 | 0 | 0 | .112 |
| 21 | 59 | 33 | T | 74 | 47 | 65 | 50 | 19 | 0 | 0 | .164 |
| 22 | 59 | 41 | 0 | 66 | 47 | 60 | 48 | 15 | 0 | 0 | .036 |
| 23 | 63 | 31 | 0 | 74 | 44 | 65 | 48 | 18 | 0 | 0 | .148 |
| 24 | 59 | 39 | 0 | 70 | 43 | 63 | 47 | 16 | 0 | 0 | .219 |
| 25 | 68 | 35 | 0 | 70 | 44 | 64 | 47 | 13 | 0 | 2 | .205 |
| 26 | 68 | 32 | 0 | 77 | 46 | 69 | 48 | 15 | 0 | 0 | .172 |
| 27 | 53 | 40 | .08 | 61 | 47 | 57 | 51 | 18 | 0 | 0 | .070 |
| 28 | 60 | 33 | T | 71 | 47 | 64 | 49 | 18 | 0 | 0 | .118 |
| 29 | 65 | 41 | 0 | 74 | 46 | 67 | 48 | 12 | 0 | 3 | .165 |
| 30 | 73 | 40 | 0 | 78 | 49 | 70 | 51 | 8 | 0 | 7 | .244 |
| Average/Total | 61.0 | 40.2 | 1.85 | 67.4 | 47.5 | 61.3 | 49.2 | 424 | 0 | 64 | 3.773 |
| Departure | 1.5 | 1.0 | -0.71 |   |   |   |   |   |   |   |   |