| Lat | January[1] | July[1] | Year[2] | |||
| mm | in | mm | in | mm | in | |
| 75° | 758.3 | 29.86 | 758.0 | 29.85 | 760.0 | 29.92 |
| 70 | 760.1 | 29.93 | 757.6 | 29.82 | 758.6 | 29.86 |
| 65 | 762.0 | 30.00 | 757.5 | 29.82 | 758.2 | 29.85 |
| 60 | 760.8 | 29.96 | 757.7 | 29.83 | 758.7 | 29.86 |
| 55 | 761.1 | 29.97 | 758.1 | 29.84 | 759.7 | 29.91 |
| 50 | 762.3 | 30.03 | 758.9 | 29.92 | 760.7 | 29.95 |
| 45 | 763.0 | 30.04 | 759.6 | 29.90 | 761.5 | 29.98 |
| 40 | 763.9 | 30.08 | 760.0 | 29.92 | 762.0 | 30.00 |
| 35 | 764.8 | 30.11 | 759.8 | 29.91 | 762.4 | 30.02 |
| 30 | 765.0 | 30.11 | 759.3 | 29.89 | 761.7 | 29.99 |
| 25 | 764.0 | 30.08 | 758.5 | 29.86 | 760.4 | 29.94 |
| 20 | 762.3 | 30.03 | 758.0 | 29.84 | 759.2 | 29.89 |
| 15 | 760.5 | 29.24 | 757.5 | 29.82 | 758.3 | 29.85 |
| 10 | 759.1 | 29.88 | 757.7 | 29.80 | 757.9 | 29.84 |
| 5 | 758.2 | 29.85 | 758.5 | 29.86 | 758.0 | 29.84 |
| 0 | 758.0 | 29.84 | 759.1 | 29.88 | 758.0 | 29.84 |
The difference in results shown in the foregoing tables are much too great to be attributed merely to observational error. Spitaler’s means were computed mainly from observations made in Europe; Ferrel’s from American data. Means obtained in latitudes lower than Lat 25 are from unknown sources. The following means were obtained at the Key West Weather Bureau Station, Lat 24° 33′.
| mm | in | mm | in | mm | in | |||
| Jan. | 764.40 | 30.09 | May | 761.58 | 29.98 | Sept. | 760.90 | 29.96 |
| Feb. | 764.08 | 30.08 | June | 761.80 | 29.99 | Oct. | 760.38 | 29.94 |
| March | 763.58 | 30.03 | July | 763.10 | 30.04 | Nov. | 763.05 | 30.07 |
| April | 762.90 | 30.03 | Aug. | 762.20 | 30.01 | Dec. | 764.34 | 30.09 |
Mean for the years 1891-1904, 762.69 mm, 30.03 in.
