| Monthly Observation SummaryApril 1998 | |||||||||||||
| Station "APLMD" (JHU/Applied Physics Laboratory), Laurel, MD (39°10'02"N, 76°53'52"W, 438 ft) | |||||||||||||
| Day | Max. Temp. | Min. Temp. | Rain Day | Rain Month | Rain Year | Max. Rn Rate | Peak Gust | Max. Light | Last Light | Min. Press. | Max. Press. | Min. RH | Max. RH |
| (°F) | (°F) | (in.) | (in.) | (in.) | (in./hr) | (mph) | (in.) | (in.) | (%) | (%) | |||
| 1 | 75 | 59 | 0.17 | 0.17 | 19.12 | 0.48 | 34 | 78 | 18:45 | 29.65 | 29.84 | 54 | 100 |
| 2 | 75 | 50 | 0.01 | 0.18 | 19.13 | 0.04 | 29 | 81 | 18:49 | 29.73 | 29.91 | 26 | 100 |
| 3 | 64 | 40 | 0.00 | 0.18 | 19.13 | 0.00 | 17 | 80 | 18:49 | 29.68 | 30.01 | 35 | 90 |
| 4 | 51 | 39 | 0.25 | 0.43 | 19.38 | 0.12 | 31 | 73 | 18:47 | 29.58 | 29.82 | 60 | 100 |
| 5 | 56 | 38 | 0.00 | 0.43 | 19.38 | 0.00 | 28 | 81 | 18:52 | 29.77 | 29.93 | 32 | 69 |
| 6 | 61 | 38 | 0.00 | 0.43 | 19.38 | 0.00 | 25 | 80 | 19:53 | 29.84 | 29.91 | 22 | 61 |
| 7 | 69 | 38 | 0.00 | 0.43 | 19.38 | 0.00 | 13 | 79 | 19:52 | 29.85 | 30.01 | 22 | 77 |
| 8 | 73 | 47 | 0.07 | 0.50 | 19.45 | 0.28 | 36 | 80 | 19:54 | 29.68 | 29.88 | 50 | 100 |
| 9 | 54 | 43 | 1.16 | 1.66 | 20.61 | 1.56 | 29 | 67 | 19:56 | 29.25 | 29.71 | 92 | 100 |
| 10 | 57 | 40 | 0.00 | 1.66 | 20.61 | 0.00 | 18 | 81 | 19:56 | 29.46 | 29.91 | 39 | 100 |
| 11 | 62 | 38 | 0.00 | 1.66 | 20.61 | 0.00 | 19 | 79 | 19:58 | 29.90 | 30.12 | 25 | 83 |
| 12 | 68 | 43 | 0.00 | 1.66 | 20.61 | 0.00 | 16 | 79 | 20:00 | 30.12 | 30.29 | 22 | 72 |
| 13 | 71 | 36 | 0.00 | 1.66 | 20.61 | 0.00 | 14 | 79 | 19:58 | 30.02 | 30.27 | 22 | 100 |
| 14 | 72 | 49 | 0.04 | 1.70 | 20.65 | 0.12 | 24 | 78 | 19:57 | 29.74 | 30.02 | 45 | 100 |
| 15 | 75 | 52 | 0.00 | 1.70 | 20.65 | 0.00 | 21 | 77 | 20:00 | 29.73 | 29.87 | 37 | 100 |
| 16 | 79 | 56 | 0.00 | 1.70 | 20.65 | 0.00 | 33 | 76 | 20:00 | 29.73 | 29.85 | 45 | 94 |
| 17 | 79 | 53 | 0.77 | 2.47 | 21.42 | 2.92 | 51 | 79 | 20:03 | 29.71 | 30.05 | 60 | 100 |
| 18 | 65 | 45 | 0.00 | 2.47 | 21.42 | 0.00 | 17 | 79 | 19:55 | 30.05 | 30.27 | 33 | 83 |
| 19 | 53 | 47 | 0.89 | 3.36 | 22.31 | 0.64 | 19 | 68 | 19:44 | 29.77 | 30.16 | 76 | 100 |
| 20 | 62 | 47 | 0.02 | 3.38 | 22.33 | 0.04 | 31 | 82 | 20:05 | 29.79 | 30.07 | 43 | 100 |
| 21 | 71 | 42 | 0.00 | 3.38 | 22.33 | 0.00 | 12 | 80 | 20:05 | 30.05 | 30.15 | 29 | 100 |
| 22 | 69 | 44 | 0.00 | 3.38 | 22.33 | 0.00 | 20 | 79 | 20:07 | 29.88 | 30.09 | 33 | 100 |
| 23 | 65 | 47 | 0.00 | 3.38 | 22.33 | 0.00 | 18 | 76 | 20:08 | 29.71 | 29.90 | 39 | 87 |
| 24 | 73 | 50 | 0.00 | 3.38 | 22.33 | 0.00 | 21 | 80 | 20:10 | 29.73 | 29.85 | 24 | 70 |
| 25 | 74 | 55 | 0.00 | 3.38 | 22.33 | 0.00 | 24 | 78 | 20:09 | 29.84 | 29.99 | 27 | 69 |
| 26 | 71 | 47 | 0.06 | 3.44 | 22.39 | 0.12 | 38 | 77 | 20:02 | 29.74 | 29.96 | 46 | 100 |
| 27 | 58 | 43 | 0.16 | 3.60 | 22.55 | 0.24 | 26 | 80 | 20:14 | 29.91 | 30.20 | 31 | 100 |
| 28 | 62 | 39 | 0.00 | 3.60 | 22.55 | 0.00 | 23 | 80 | 20:15 | 30.18 | 30.37 | 31 | 83 |
| 29 | 75 | 39 | 0.00 | 3.60 | 22.55 | 0.00 | 19 | 78 | 20:14 | 30.09 | 30.32 | 34 | 100 |
| 30 | 77 | 53 | 0.00 | 3.60 | 22.55 | 0.00 | 20 | 79 | 20:13 | 29.90 | 30.09 | 48 | 98 |
| Avg. | 67.2 | 45.2 | |||||||||||
| Max. | 79 | 1.16 | 2.92 | 51 | 82 | 30.37 | 92 | 100 | |||||
| Min. | 36 | 12 | 67 | 29.25 | 22 | 61 | |||||||