| Monthly Observation SummaryMay 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 | 69 | 41 | 0.00 | 0.00 | 13.50 | 0.00 | 24 | 78 | 20:16 | 30.15 | 30.27 | 22 | 81 |
| 2 | 69 | 43 | 0.00 | 0.00 | 13.50 | 0.00 | 25 | 77 | 20:15 | 30.10 | 30.18 | 27 | 80 |
| 3 | 58 | 48 | 0.01 | 0.01 | 13.51 | 0.04 | 23 | 62 | 20:07 | 30.02 | 30.12 | 46 | 97 |
| 4 | 77 | 51 | 0.00 | 0.01 | 13.51 | 0.00 | 16 | 77 | 20:18 | 29.95 | 30.04 | 37 | 96 |
| 5 | 78 | 50 | 0.00 | 0.01 | 13.51 | 0.00 | 16 | 77 | 20:14 | 29.95 | 30.04 | 46 | 100 |
| 6 | 63 | 55 | 0.00 | 0.01 | 13.51 | 0.00 | 15 | 64 | 20:15 | 29.91 | 30.01 | 82 | 100 |
| 7 | 72 | 56 | 0.02 | 0.03 | 13.53 | 0.04 | 13 | 78 | 20:21 | 29.90 | 30.01 | 70 | 100 |
| 8 | 79 | 59 | 0.03 | 0.06 | 13.56 | 0.04 | 20 | 82 | 20:23 | 29.84 | 29.95 | 41 | 100 |
| 9 | 75 | 58 | 0.00 | 0.06 | 13.56 | 0.00 | 22 | 81 | 20:24 | 29.91 | 30.05 | 37 | 70 |
| 10 | 77 | 48 | 0.00 | 0.06 | 13.56 | 0.00 | 16 | 81 | 20:24 | 30.05 | 30.16 | 25 | 89 |
| 11 | 79 | 50 | 0.00 | 0.06 | 13.56 | 0.00 | 13 | 78 | 20:24 | 30.12 | 30.27 | 31 | 87 |
| 12 | 86 | 53 | 0.00 | 0.06 | 13.56 | 0.00 | 17 | 78 | 20:25 | 29.87 | 30.13 | 35 | 99 |
| 13 | 69 | 59 | 0.00 | 0.06 | 13.56 | 0.00 | 21 | 75 | 20:25 | 29.85 | 29.99 | 40 | 92 |
| 14 | 69 | 50 | 0.00 | 0.06 | 13.56 | 0.00 | 20 | 75 | 20:25 | 29.99 | 30.26 | 33 | 70 |
| 15 | 72 | 45 | 0.00 | 0.06 | 13.56 | 0.00 | 27 | 78 | 20:30 | 30.23 | 30.34 | 25 | 77 |
| 16 | 72 | 43 | 0.00 | 0.06 | 13.56 | 0.00 | 14 | 78 | 20:29 | 30.24 | 30.37 | 44 | 86 |
| 17 | 75 | 49 | 0.00 | 0.06 | 13.56 | 0.00 | 14 | 78 | 20:29 | 30.18 | 30.32 | 48 | 100 |
| 18 | 79 | 51 | 0.00 | 0.06 | 13.56 | 0.00 | 16 | 80 | 20:24 | 30.01 | 30.21 | 36 | 100 |
| 19 | 77 | 63 | 0.00 | 0.06 | 13.56 | 0.00 | 23 | 79 | 20:32 | 29.96 | 30.05 | 50 | 96 |
| 20 | 75 | 53 | 0.00 | 0.06 | 13.56 | 0.00 | 25 | 78 | 20:32 | 30.04 | 30.18 | 28 | 72 |
| 21 | 82 | 49 | 0.00 | 0.06 | 13.56 | 0.00 | 14 | 78 | 20:33 | 30.05 | 30.23 | 27 | 80 |
| 22 | 88 | 53 | 0.23 | 0.29 | 13.79 | 0.24 | 29 | 77 | 20:33 | 29.88 | 30.07 | 28 | 97 |
| 23 | 78 | 62 | 0.30 | 0.59 | 14.09 | 0.48 | 18 | 79 | 20:35 | 29.77 | 29.90 | 52 | 100 |
| 24 | 77 | 55 | 0.64 | 1.23 | 14.73 | 0.84 | 34 | 80 | 20:38 | 29.54 | 29.79 | 35 | 99 |
| 25 | 72 | 53 | 0.00 | 1.23 | 14.73 | 0.00 | 29 | 80 | 20:38 | 29.77 | 29.91 | 29 | 74 |
| 26 | 78 | 56 | 0.00 | 1.23 | 14.73 | 0.00 | 27 | 81 | 20:36 | 29.82 | 29.95 | 28 | 57 |
| 27 | 74 | 54 | 0.00 | 1.23 | 14.73 | 0.00 | 23 | 78 | 20:40 | 29.93 | 30.02 | 28 | 70 |
| 28 | 85 | 56 | 0.00 | 1.23 | 14.73 | 0.00 | 21 | 80 | 20:41 | 30.02 | 30.12 | 27 | 55 |
| 29 | 89 | 63 | 0.00 | 1.23 | 14.73 | 0.00 | 13 | 80 | 20:42 | 30.10 | 30.23 | 22 | 50 |
| 30 | 93 | 65 | 0.00 | 1.23 | 14.73 | 0.00 | 11 | 80 | 20:41 | 30.15 | 30.27 | 28 | 76 |
| 31 | 90 | 60 | 0.00 | 1.23 | 14.73 | 0.00 | 20 | 77 | 20:41 | 30.07 | 30.20 | 25 | 90 |
| Avg. | 76.6 | 53.3 | |||||||||||
| Max. | 93 | 0.64 | 0.84 | 34 | 82 | 30.37 | 82 | 100 | |||||
| Min. | 41 | 11 | 62 | 29.54 | 22 | 50 | |||||||