| Monthly Observation SummaryAugust 1999 | |||||||||||||
| 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 | 94 | 74 | 0.02 | 0.02 | 17.86 | 0.12 | 31 | 79 | 20:37 | 29.84 | 29.96 | 40 | 89 |
| 2 | 86 | 68 | 0.00 | 0.02 | 17.86 | 0.00 | 21 | 79 | 20:37 | 29.96 | 30.12 | 32 | 86 |
| 3 | 88 | 65 | 0.00 | 0.02 | 17.86 | 0.00 | 18 | 79 | 20:35 | 30.10 | 30.23 | 31 | 73 |
| 4 | 92 | 62 | 0.00 | 0.02 | 17.86 | 0.00 | 17 | 78 | 20:34 | 29.95 | 30.13 | 28 | 89 |
| 5 | 89 | 65 | 0.00 | 0.02 | 17.86 | 0.00 | 19 | 77 | 20:33 | 29.88 | 29.99 | 33 | 87 |
| 6 | 91 | 64 | 0.00 | 0.02 | 17.86 | 0.00 | 19 | 79 | 20:30 | 29.96 | 30.05 | 26 | 75 |
| 7 | 92 | 66 | 0.00 | 0.02 | 17.86 | 0.00 | 18 | 79 | 20:28 | 30.01 | 30.18 | 28 | 74 |
| 8 | 82 | 73 | 0.05 | 0.07 | 17.91 | 0.04 | 23 | 71 | 20:26 | 29.82 | 30.01 | 59 | 89 |
| 9 | 81 | 62 | 0.00 | 0.07 | 17.91 | 0.00 | 21 | 77 | 20:27 | 29.87 | 30.01 | 29 | 81 |
| 10 | 87 | 56 | 0.00 | 0.07 | 17.91 | 0.00 | 17 | 79 | 20:26 | 29.82 | 30.02 | XX | XX |
| 11 | 94 | 67 | 0.00 | 0.07 | 17.91 | 0.00 | 21 | 78 | 20:23 | 29.79 | 29.91 | XX | XX |
| 12 | 97 | 69 | 0.00 | 0.07 | 17.91 | 0.00 | 14 | 78 | 20:23 | 29.91 | 30.02 | XX | XX |
| 13 | 96 | 73 | 0.00 | 0.07 | 17.91 | 0.00 | 26 | 77 | 20:17 | 29.77 | 29.98 | 40 | 96 |
| 14 | 96 | 72 | 0.23 | 0.30 | 18.14 | 0.44 | 23 | 77 | 20:21 | 29.77 | 29.91 | 42 | 98 |
| 15 | 80 | 68 | 0.07 | 0.37 | 18.21 | 0.20 | 17 | 78 | 20:19 | 29.90 | 30.16 | 61 | 100 |
| 16 | 91 | 63 | 0.00 | 0.37 | 18.21 | 0.00 | 12 | 79 | 20:18 | 30.13 | 30.27 | 32 | 94 |
| 17 | 97 | 68 | 0.00 | 0.37 | 18.21 | 0.00 | 17 | 78 | 20:18 | 29.87 | 30.16 | 24 | 100 |
| 18 | 90 | 70 | 0.00 | 0.37 | 18.21 | 0.00 | 21 | 79 | 20:15 | 29.84 | 29.96 | 30 | 73 |
| 19 | 88 | 65 | 0.00 | 0.37 | 18.21 | 0.00 | 14 | 79 | 20:12 | 29.93 | 30.04 | 33 | 87 |
| 20 | 86 | 65 | 0.87 | 1.24 | 19.08 | 1.36 | 15 | 79 | 20:08 | 29.93 | 30.02 | 51 | 100 |
| 21 | 77 | 61 | 0.00 | 1.24 | 19.08 | 0.00 | 12 | 76 | 19:56 | 29.95 | 30.05 | 61 | 100 |
| 22 | 80 | 61 | 0.01 | 1.25 | 19.09 | 0.04 | 14 | 78 | 20:08 | 30.01 | 30.10 | 37 | 100 |
| 23 | 86 | 58 | 0.00 | 1.25 | 19.09 | 0.00 | 16 | 78 | 20:07 | 30.02 | 30.13 | 36 | 100 |
| 24 | 83 | 64 | 0.44 | 1.69 | 19.53 | 0.72 | 19 | 75 | 20:04 | 30.05 | 30.13 | 40 | 100 |
| 25 | 76 | 65 | 1.83 | 3.52 | 21.36 | 1.20 | 17 | 66 | 20:02 | 29.91 | 30.09 | 80 | 100 |
| 26 | 87 | 68 | 0.78 | 4.30 | 22.14 | 2.64 | 26 | 78 | 19:45 | 29.82 | 29.95 | 55 | 100 |
| 27 | 85 | 66 | 0.00 | 4.30 | 22.14 | 0.00 | 11 | 77 | 19:59 | 29.87 | 29.98 | 47 | 100 |
| 28 | 86 | 65 | 0.00 | 4.30 | 22.14 | 0.00 | 14 | 76 | 20:00 | 29.93 | 30.02 | 46 | 99 |
| 29 | 88 | 66 | 0.00 | 4.30 | 22.14 | 0.00 | 29 | 77 | 20:01 | 29.90 | 30.05 | 36 | 88 |
| 30 | 66 | 56 | 0.00 | 4.30 | 22.14 | 0.00 | 31 | 76 | 19:58 | 30.05 | 30.20 | 45 | 74 |
| 31 | 71 | 58 | 0.00 | 4.30 | 22.14 | 0.00 | 22 | 73 | 19:54 | 30.15 | 30.27 | 48 | 77 |
| Avg. | 86.5 | 65.3 | |||||||||||
| Max. | 97 | 1.83 | 2.64 | 31 | 79 | 30.27 | 80 | 100 | |||||
| Min. | 56 | 11 | 66 | 29.77 | 24 | 73 | |||||||