| Monthly Observation SummaryJanuary 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 | 34 | 15 | 0.00 | 0.00 | 0.00 | 0.00 | 29 | 68 | 17:15 | 30.24 | 30.57 | 39 | 94 |
| 2 | 59 | 32 | 0.00 | 0.00 | 0.00 | 0.00 | 21 | 62 | 17:16 | 30.24 | 30.35 | 27 | 62 |
| 3 | 62 | 39 | 0.00 | 0.00 | 0.00 | 0.00 | 15 | 68 | 17:17 | 30.23 | 30.32 | 30 | 66 |
| 4 | 68 | 44 | 0.00 | 0.00 | 0.00 | 0.00 | 15 | 62 | 17:16 | 30.24 | 30.35 | 37 | 98 |
| 5 | 65 | 36 | 0.00 | 0.00 | 0.00 | 0.00 | 18 | 62 | 17:16 | 30.18 | 30.37 | 58 | 100 |
| 6 | 65 | 53 | 0.00 | 0.00 | 0.00 | 0.00 | 18 | 66 | 17:18 | 30.05 | 30.18 | 89 | 100 |
| 7 | 62 | 59 | 0.27 | 0.27 | 0.27 | 0.24 | 18 | 55 | 17:00 | 29.79 | 30.05 | 100 | 100 |
| 8 | 66 | 59 | 0.28 | 0.55 | 0.55 | 0.16 | 28 | 56 | 17:17 | 29.52 | 29.79 | 98 | 100 |
| 9 | 62 | 40 | 0.05 | 0.60 | 0.60 | 0.12 | 43 | 69 | 17:23 | 29.55 | 29.98 | 52 | 100 |
| 10 | 53 | 34 | 0.00 | 0.60 | 0.60 | 0.00 | 13 | 62 | 17:23 | 29.98 | 30.18 | 43 | 92 |
| 11 | 50 | 30 | 0.00 | 0.60 | 0.60 | 0.00 | 15 | 62 | 17:23 | 30.09 | 30.16 | 43 | 100 |
| 12 | 40 | 33 | 0.02 | 0.62 | 0.62 | 0.04 | 13 | 64 | 17:22 | 30.16 | 30.35 | 43 | 100 |
| 13 | 53 | 31 | 0.06 | 0.68 | 0.68 | 0.16 | 32 | 69 | 17:23 | 29.99 | 30.29 | 52 | 100 |
| 14 | 37 | 25 | 0.00 | 0.68 | 0.68 | 0.00 | 28 | 64 | 17:25 | 30.24 | 30.51 | 40 | 77 |
| 15 | 38 | 26 | 1.01 | 1.69 | 1.69 | 0.16 | 14 | 45 | 17:15 | 29.69 | 30.34 | 73 | 100 |
| 16 | 40 | 34 | 0.02 | 1.71 | 1.71 | 0.04 | 22 | 54 | 17:25 | 29.60 | 29.80 | 97 | 100 |
| 17 | 44 | 36 | 0.12 | 1.83 | 1.83 | 0.12 | 13 | 66 | 17:24 | 29.80 | 29.95 | 77 | 100 |
| 18 | 41 | 33 | 0.01 | 1.84 | 1.84 | 0.04 | 21 | 70 | 17:29 | 29.85 | 30.07 | 58 | 100 |
| 19 | 36 | 33 | 0.05 | 1.89 | 1.89 | 0.04 | 12 | 57 | 17:21 | 29.91 | 30.04 | 89 | 100 |
| 20 | 37 | 29 | 0.00 | 1.89 | 1.89 | 0.00 | 26 | 71 | 17:31 | 29.95 | 30.18 | 53 | 100 |
| 21 | 38 | 25 | 0.00 | 1.89 | 1.89 | 0.00 | 13 | 68 | 17:32 | 30.18 | 30.31 | 52 | 88 |
| 22 | 37 | 25 | 0.02 | 1.91 | 1.91 | 0.04 | 11 | 63 | 17:29 | 30.24 | 30.37 | 73 | 100 |
| 23 | 48 | 33 | 1.77 | 3.68 | 3.68 | 0.40 | 19 | 44 | 17:34 | 29.84 | 30.31 | 100 | 100 |
| 24 | 47 | 32 | 0.14 | 3.82 | 3.82 | 0.12 | 24 | 71 | 17:22 | 29.71 | 29.87 | 77 | 100 |
| 25 | 40 | 30 | 0.00 | 3.82 | 3.82 | 0.00 | 35 | 67 | 17:38 | 29.79 | 30.26 | 53 | 100 |
| 26 | 43 | 26 | 0.00 | 3.82 | 3.82 | 0.00 | 11 | 70 | 17:38 | 30.24 | 30.38 | 52 | 98 |
| 27 | 41 | 29 | 0.35 | 4.17 | 4.17 | 0.12 | 27 | 63 | 17:28 | 29.93 | 30.35 | 83 | 100 |
| 28 | 39 | 34 | 1.78 | 5.95 | 5.95 | 0.24 | 33 | 47 | 17:38 | 29.69 | 29.93 | 73 | 100 |
| 29 | 56 | 36 | 0.00 | 5.95 | 5.95 | 0.00 | 16 | 67 | 17:44 | 29.71 | 29.90 | 48 | 96 |
| 30 | 44 | 33 | 0.00 | 5.95 | 5.95 | 0.00 | 32 | 67 | 17:43 | 29.68 | 29.90 | 58 | 94 |
| 31 | 41 | 31 | 0.00 | 5.95 | 5.95 | 0.00 | 24 | 73 | 17:46 | 29.88 | 30.15 | 56 | 82 |
| Avg. | 47.9 | 34.0 | |||||||||||
| Max. | 68 | 1.78 | 0.40 | 43 | 73 | 30.57 | 100 | 100 | |||||
| Min. | 15 | 11 | 44 | 29.52 | 27 | 62 | |||||||