| Monthly Observation SummaryMarch 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 | 46 | 35 | 0.00 | 0.00 | 7.45 | 0.00 | 32 | 73 | 18:15 | 29.41 | 29.69 | 45 | 77 |
| 2 | 55 | 34 | 0.00 | 0.00 | 7.45 | 0.00 | 28 | 73 | 18:15 | 29.69 | 29.93 | 22 | 76 |
| 3 | 68 | 39 | 0.22 | 0.22 | 7.67 | 0.36 | 32 | 76 | 18:16 | 29.19 | 29.93 | 44 | 96 |
| 4 | 40 | 30 | 0.22 | 0.44 | 7.89 | 0.04 | 48 | 76 | 18:19 | 29.21 | 30.16 | 45 | 100 |
| 5 | 48 | 29 | 0.00 | 0.44 | 7.89 | 0.00 | 16 | 73 | 18:20 | 30.16 | 30.40 | 36 | 66 |
| 6 | 53 | 34 | 0.40 | 0.84 | 8.29 | 0.24 | 43 | 72 | 18:20 | 29.80 | 30.27 | 63 | 98 |
| 7 | 34 | 21 | 0.00 | 0.84 | 8.29 | 0.00 | 41 | 76 | 18:22 | 29.98 | 30.53 | 33 | 68 |
| 8 | 36 | 16 | 0.00 | 0.84 | 8.29 | 0.00 | 23 | 77 | 18:21 | 30.43 | 30.67 | 33 | 62 |
| 9 | 30 | 23 | 0.44 | 1.28 | 8.73 | 0.04 | 12 | 65 | 18:20 | 29.93 | 30.43 | 44 | 100 |
| 10 | 40 | 24 | 0.00 | 1.28 | 8.73 | 0.00 | 19 | 74 | 18:25 | 29.84 | 29.95 | 46 | 100 |
| 11 | 41 | 24 | 0.00 | 1.28 | 8.73 | 0.00 | 30 | 76 | 18:25 | 29.85 | 29.99 | 42 | 68 |
| 12 | 44 | 28 | 0.00 | 1.28 | 8.73 | 0.00 | 35 | 74 | 18:25 | 29.91 | 30.10 | 37 | 67 |
| 13 | 47 | 30 | 0.00 | 1.28 | 8.73 | 0.00 | 26 | 75 | 18:25 | 30.10 | 30.21 | 47 | 67 |
| 14 | 38 | 32 | 1.02 | 2.30 | 9.75 | 0.04 | 16 | 58 | 18:19 | 29.69 | 30.13 | 65 | 100 |
| 15 | 44 | 33 | 0.14 | 2.44 | 9.89 | 0.04 | 34 | 78 | 18:29 | 29.58 | 29.98 | 42 | 100 |
| 16 | 53 | 31 | 0.00 | 2.44 | 9.89 | 0.00 | 19 | 75 | 18:30 | 29.87 | 30.09 | 28 | 62 |
| 17 | 75 | 41 | 0.00 | 2.44 | 9.89 | 0.00 | 24 | 78 | 18:29 | 29.79 | 29.98 | 19 | 57 |
| 18 | 69 | 43 | 0.00 | 2.44 | 9.89 | 0.00 | 41 | 78 | 18:32 | 29.74 | 30.04 | 19 | 56 |
| 19 | 50 | 35 | 0.00 | 2.44 | 9.89 | 0.00 | 32 | 77 | 18:33 | 30.02 | 30.26 | 34 | 63 |
| 20 | 55 | 30 | 0.00 | 2.44 | 9.89 | 0.00 | 16 | 77 | 18:33 | 30.13 | 30.31 | 27 | 72 |
| 21 | 44 | 37 | 1.10 | 3.54 | 10.99 | 0.48 | 21 | 59 | 18:20 | 29.69 | 30.13 | 68 | 100 |
| 22 | 49 | 36 | 0.01 | 3.55 | 11.00 | 0.04 | 34 | 79 | 18:35 | 29.68 | 30.12 | 35 | 96 |
| 23 | 54 | 30 | 0.01 | 3.56 | 11.01 | 0.04 | 23 | 77 | 18:30 | 30.10 | 30.23 | 31 | 95 |
| 24 | 56 | 42 | 0.05 | 3.61 | 11.06 | 0.04 | 13 | 76 | 18:29 | 29.88 | 30.10 | 59 | 96 |
| 25 | 52 | 36 | 0.00 | 3.61 | 11.06 | 0.00 | 21 | 78 | 18:39 | 29.95 | 30.18 | 32 | 87 |
| 26 | 52 | 30 | 0.00 | 3.61 | 11.06 | 0.00 | 21 | 78 | 18:40 | 30.15 | 30.27 | 30 | 72 |
| 27 | 51 | 32 | 0.00 | 3.61 | 11.06 | 0.00 | 23 | 76 | 18:38 | 29.95 | 30.21 | 33 | 77 |
| 28 | 55 | 40 | 0.07 | 3.68 | 11.13 | 0.04 | 27 | 75 | 18:41 | 29.95 | 30.01 | 42 | 93 |
| 29 | 68 | 42 | 0.00 | 3.68 | 11.13 | 0.00 | 27 | 78 | 18:43 | 29.98 | 30.18 | 23 | 79 |
| 30 | 65 | 45 | 0.00 | 3.68 | 11.13 | 0.00 | 26 | 77 | 18:44 | 30.18 | 30.35 | 16 | 45 |
| 31 | 72 | 40 | 0.00 | 3.68 | 11.13 | 0.00 | 28 | 78 | 18:44 | 30.07 | 30.32 | 15 | 61 |
| Avg. | 51.1 | 33.0 | |||||||||||
| Max. | 75 | 1.10 | 0.48 | 48 | 79 | 30.67 | 68 | 100 | |||||
| Min. | 16 | 12 | 58 | 29.19 | 15 | 45 | |||||||