| Monthly Observation SummaryDecember 1997 | |||||||||||||
| 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 | 48 | 34 | 0.00 | 0.00 | 36.53 | 0.00 | 39 | 64 | 17:06 | 29.41 | 29.93 | 45 | 100 |
| 2 | 47 | 33 | 0.00 | 0.00 | 36.53 | 0.00 | 29 | 63 | 17:03 | 29.91 | 30.16 | 42 | 72 |
| 3 | 51 | 28 | 0.06 | 0.06 | 36.59 | 0.12 | 19 | 70 | 17:04 | 29.80 | 30.18 | 37 | 99 |
| 4 | 58 | 44 | 0.08 | 0.14 | 36.67 | 0.04 | 19 | 70 | 16:54 | 29.62 | 29.82 | 63 | 100 |
| 5 | 45 | 30 | 0.00 | 0.14 | 36.67 | 0.00 | 37 | 69 | 17:05 | 29.60 | 29.74 | 45 | 85 |
| 6 | 37 | 30 | 0.00 | 0.14 | 36.67 | 0.00 | 34 | 64 | 17:04 | 29.69 | 29.79 | 45 | 75 |
| 7 | 42 | 30 | 0.00 | 0.14 | 36.67 | 0.00 | 29 | 68 | 17:04 | 29.76 | 30.04 | 57 | 73 |
| 8 | 44 | 30 | 0.00 | 0.14 | 36.67 | 0.00 | 19 | 70 | 17:02 | 30.02 | 30.15 | 60 | 96 |
| 9 | 38 | 29 | 0.06 | 0.20 | 36.73 | 0.12 | 7 | 62 | 17:03 | 29.95 | 30.05 | 96 | 100 |
| 10 | 40 | 36 | 0.34 | 0.54 | 37.07 | 0.16 | 14 | 58 | 16:59 | 29.62 | 29.96 | 100 | 100 |
| 11 | 42 | 38 | 0.00 | 0.54 | 37.07 | 0.00 | 8 | 56 | 16:57 | 29.73 | 30.07 | 100 | 100 |
| 12 | 47 | 32 | 0.00 | 0.54 | 37.07 | 0.00 | 22 | 68 | 17:03 | 30.01 | 30.09 | 62 | 100 |
| 13 | 46 | 26 | 0.00 | 0.54 | 37.07 | 0.00 | 20 | 61 | 17:04 | 29.85 | 30.01 | 46 | 98 |
| 14 | 43 | 31 | 0.00 | 0.54 | 37.07 | 0.00 | 27 | 62 | 17:04 | 29.90 | 30.12 | 46 | 76 |
| 15 | 48 | 25 | 0.00 | 0.54 | 37.07 | 0.00 | 14 | 61 | 17:07 | 30.09 | 30.24 | 37 | 91 |
| 16 | 62 | 33 | 0.00 | 0.54 | 37.07 | 0.00 | 14 | 61 | 17:06 | 29.91 | 30.16 | 21 | 69 |
| 17 | 56 | 38 | 0.00 | 0.54 | 37.07 | 0.00 | 16 | 62 | 17:06 | 29.87 | 29.99 | 26 | 74 |
| 18 | 50 | 33 | 0.00 | 0.54 | 37.07 | 0.00 | 11 | 61 | 17:05 | 29.99 | 30.13 | 29 | 82 |
| 19 | 59 | 34 | 0.00 | 0.54 | 37.07 | 0.00 | 21 | 66 | 17:05 | 30.01 | 30.12 | 31 | 77 |
| 20 | 59 | 40 | 0.00 | 0.54 | 37.07 | 0.00 | 23 | 65 | 17:07 | 29.90 | 30.10 | 41 | 75 |
| 21 | 45 | 29 | 0.00 | 0.54 | 37.07 | 0.00 | 10 | 62 | 17:05 | 30.10 | 30.37 | 46 | 89 |
| 22 | 35 | 27 | 0.44 | 0.98 | 37.51 | 0.28 | 13 | 63 | 16:59 | 29.95 | 30.38 | 72 | 100 |
| 23 | 48 | 33 | 0.02 | 1.00 | 37.53 | 0.04 | 17 | 65 | 17:02 | 29.88 | 30.04 | 81 | 100 |
| 24 | 44 | 33 | 0.41 | 1.41 | 37.94 | 0.24 | 19 | 66 | 17:01 | 29.87 | 30.21 | 66 | 100 |
| 25 | 54 | 38 | 0.30 | 1.71 | 38.24 | 0.28 | 20 | 67 | 17:11 | 29.68 | 29.87 | 66 | 100 |
| 26 | 50 | 33 | 0.00 | 1.71 | 38.24 | 0.00 | 24 | 67 | 17:10 | 29.84 | 29.96 | 48 | 100 |
| 27 | 36 | 32 | 0.05 | 1.76 | 38.29 | 0.04 | 12 | 47 | 17:05 | 29.63 | 29.93 | 81 | 100 |
| 28 | 40 | 23 | 0.09 | 1.85 | 38.38 | 0.04 | 15 | 62 | 17:11 | 29.69 | 30.02 | 54 | 100 |
| 29 | 39 | 24 | 0.31 | 2.16 | 38.69 | 0.28 | 23 | 65 | 17:10 | 29.18 | 30.01 | 77 | 100 |
| 30 | 40 | 30 | 0.05 | 2.21 | 38.74 | 0.04 | 32 | 64 | 17:13 | 29.15 | 29.66 | 56 | 100 |
| 31 | 34 | 20 | 0.00 | 2.21 | 38.74 | 0.00 | 26 | 68 | 17:15 | 29.65 | 30.34 | 49 | 93 |
| Avg. | 46.0 | 31.5 | |||||||||||
| Max. | 62 | 0.44 | 0.28 | 39 | 70 | 30.38 | 100 | 100 | |||||
| Min. | 20 | 7 | 47 | 29.15 | 21 | 69 | |||||||