| Monthly Observation SummaryJuly 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 | 86 | 70 | 0.18 | 0.18 | 16.63 | 0.72 | 33 | 76 | 20:49 | 30.02 | 30.13 | 62 | 96 |
| 2 | 88 | 72 | 0.13 | 0.31 | 16.76 | 0.60 | 30 | 76 | 20:49 | 30.04 | 30.15 | 57 | 95 |
| 3 | 95 | 71 | 0.00 | 0.31 | 16.76 | 0.00 | 16 | 78 | 20:52 | 30.10 | 30.23 | 40 | 97 |
| 4 | 97 | 76 | 0.00 | 0.31 | 16.76 | 0.00 | 21 | 80 | 20:55 | 30.07 | 30.18 | 40 | 88 |
| 5 | 99 | 80 | 0.00 | 0.31 | 16.76 | 0.00 | 19 | 80 | 20:55 | 29.99 | 30.12 | 37 | 70 |
| 6 | 99 | 81 | 0.00 | 0.31 | 16.76 | 0.00 | 21 | 79 | 20:45 | 29.87 | 30.05 | 35 | 66 |
| 7 | 93 | 75 | 0.00 | 0.31 | 16.76 | 0.00 | 21 | 80 | 20:55 | 29.91 | 30.05 | 28 | 70 |
| 8 | 90 | 66 | 0.00 | 0.31 | 16.76 | 0.00 | 23 | 80 | 20:53 | 29.98 | 30.09 | 25 | 73 |
| 9 | 97 | 65 | 0.00 | 0.31 | 16.76 | 0.00 | 23 | 79 | 20:49 | 29.85 | 30.09 | 25 | 79 |
| 10 | 86 | 72 | 0.00 | 0.31 | 16.76 | 0.00 | 24 | 78 | 20:52 | 29.85 | 30.09 | 50 | 66 |
| 11 | 84 | 59 | 0.00 | 0.31 | 16.76 | 0.00 | 20 | 78 | 20:53 | 30.07 | 30.27 | 26 | 74 |
| 12 | 75 | 57 | 0.17 | 0.48 | 16.93 | 0.16 | 14 | 69 | 20:45 | 30.24 | 30.34 | 49 | 97 |
| 13 | 83 | 60 | 0.04 | 0.52 | 16.97 | 0.04 | 14 | 78 | 20:49 | 30.20 | 30.26 | 38 | 100 |
| 14 | 79 | 61 | 0.00 | 0.52 | 16.97 | 0.00 | 16 | 78 | 20:50 | 30.23 | 30.32 | 41 | 94 |
| 15 | 90 | 57 | 0.00 | 0.52 | 16.97 | 0.00 | 14 | 76 | 20:50 | 30.18 | 30.27 | 38 | 98 |
| 16 | 96 | 68 | 0.00 | 0.52 | 16.97 | 0.00 | 17 | 76 | 20:50 | 30.16 | 30.26 | 35 | 95 |
| 17 | 98 | 69 | 0.00 | 0.52 | 16.97 | 0.00 | 18 | 76 | 20:45 | 30.13 | 30.26 | 27 | 96 |
| 18 | 99 | 72 | 0.00 | 0.52 | 16.97 | 0.00 | 16 | 75 | 20:44 | 30.09 | 30.20 | 25 | 83 |
| 19 | 98 | 72 | 0.00 | 0.52 | 16.97 | 0.00 | 19 | 74 | 20:42 | 29.98 | 30.12 | 32 | 84 |
| 20 | 87 | 72 | 0.15 | 0.67 | 17.12 | 0.24 | 12 | 75 | 20:43 | 30.01 | 30.16 | 58 | 93 |
| 21 | 87 | 68 | 0.00 | 0.67 | 17.12 | 0.00 | 20 | 74 | 20:40 | 30.10 | 30.24 | 56 | 97 |
| 22 | 91 | 72 | 0.13 | 0.80 | 17.25 | 0.24 | 12 | 76 | 20:46 | 29.96 | 30.13 | 55 | 97 |
| 23 | 99 | 73 | 0.00 | 0.80 | 17.25 | 0.00 | 15 | 75 | 20:40 | 29.95 | 30.05 | 27 | 96 |
| 24 | 93 | 76 | 0.00 | 0.80 | 17.25 | 0.00 | 18 | 75 | 20:36 | 29.84 | 29.98 | 40 | 89 |
| 25 | 96 | 72 | 0.00 | 0.80 | 17.25 | 0.00 | 18 | 77 | 20:27 | 29.82 | 29.95 | 26 | 83 |
| 26 | 89 | 70 | 0.00 | 0.80 | 17.25 | 0.00 | 21 | 79 | 20:40 | 29.84 | 29.93 | 37 | 82 |
| 27 | 95 | 72 | 0.00 | 0.80 | 17.25 | 0.00 | 14 | 77 | 20:41 | 29.91 | 29.99 | 27 | 68 |
| 28 | 93 | 69 | 0.09 | 0.89 | 17.34 | 0.16 | 26 | 76 | 20:34 | 29.90 | 30.04 | 33 | 95 |
| 29 | 92 | 66 | 0.00 | 0.89 | 17.34 | 0.00 | 26 | 79 | 20:40 | 29.76 | 29.90 | 36 | 96 |
| 30 | 96 | 69 | 0.50 | 1.39 | 17.84 | 1.80 | 23 | 78 | 20:40 | 29.76 | 29.84 | 40 | 94 |
| 31 | 101 | 70 | 0.00 | 1.39 | 17.84 | 0.00 | 10 | 79 | 20:32 | 29.82 | 29.93 | 23 | 94 |
| Avg. | 92.0 | 69.4 | |||||||||||
| Max. | 101 | 0.50 | 1.80 | 33 | 80 | 30.34 | 62 | 100 | |||||
| Min. | 57 | 10 | 69 | 29.76 | 23 | 66 | |||||||