1825-1869 Monthly Temperature
| YEAR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL |
| 1825 | 33.5 | 35.5 | 44.8 | 51.7 | 62.0 | 75.5 | 79.3 | 70.0 | 62.5 | 54.0 | 41.0 | 34.0 | 53.65 |
| 1826 | 34.0 | 35.5 | 39.5 | 48.5 | 72.0 | 74.0 | 73.0 | 73.0 | 67.0 | 55.0 | 42.0 | 34.0 | 53.96 |
| 1827 | 27.0 | 35.0 | 42.0 | 55.0 | 62.0 | 71.0 | 76.0 | 69.0 | 63.0 | 52.0 | 39.0 | 35.0 | 52.17 |
| 1828 | 37.0 | 41.5 | 45.0 | 47.0 | 66.0 | 77.0 | 75.0 | 76.0 | 65.0 | 54.0 | 46.5 | 39.0 | 55.75 |
| 1829 | 30.0 | 25.0 | 37.0 | 53.0 | 64.0 | 73.0 | 75.0 | 75.0 | 60.0 | 55.0 | 42.0 | 42.0 | 52.58 |
| 1830 | 30.0 | 31.5 | 41.0 | 54.5 | 64.0 | 72.0 | 79.5 | 75.0 | 67.0 | 57.0 | 50.0 | 37.0 | 54.88 |
| 1831 | 27.0 | 28.0 | 44.5 | 54.0 | 66.0 | 77.0 | 80.0 | 77.0 | 69.0 | 56.0 | 43.0 | 25.0 | 53.88 |
| 1832 | 33.0 | 36.0 | 44.0 | 51.0 | 62.0 | 71.0 | 74.0 | 74.0 | 63.0 | 55.0 | 45.0 | 38.0 | 53.83 |
| 1833 | 36.0 | 35.5 | 40.5 | 56.0 | 63.0 | 65.0 | 76.0 | 72.0 | 66.0 | 55.0 | 43.0 | 37.0 | 53.75 |
| 1834 | 29.5 | 42.0 | 44.5 | 54.5 | 64.5 | 69.0 | 79.0 | 75.0 | 66.0 | 53.0 | 44.0 | 37.0 | 54.83 |
| 1835 | 32.0 | 28.0 | 40.0 | 53.0 | 64.5 | 70.0 | 76.0 | 74.0 | 65.0 | 60.0 | 47.0 | 31.0 | 53.38 |
| 1836 | 28.0 | 24.0 | 36.0 | 55.0 | 64.0 | 66.0 | 72.0 | 68.0 | 65.5 | 48.0 | 39.5 | 29.0 | 49.58 |
| 1837 | 26.5 | 30.9 | 37.8 | 48.4 | 60.0 | 69.0 | 74.0 | 68.5 | 62.5 | 54.5 | 44.0 | 33.0 | 50.76 |
| 1838 | 36.8 | 23.6 | 41.0 | 46.0 | 58.2 | 72.9 | 78.0 | 74.8 | 65.8 | 49.6 | 39.1 | 28.4 | 51.18 |
| 1839 | 29.4 | 33.4 | 42.0 | 54.4 | 62.0 | 66.2 | 75.2 | 70.8 | 63.8 | 56.8 | 39.8 | 34.8 | 52.38 |
| 1840 | 24.4 | 39.4 | 44.0 | 55.6 | 62.1 | 69.4 | 73.9 | 74.0 | 61.5 | 54.6 | 44.0 | 30.7 | 52.8 |
| 1841 | 33.2 | 30.3 | 41.5 | 47.8 | 58.8 | 72.2 | 75.0 | 72.9 | 67.8 | 49.4 | 41.2 | 35.4 | 52.13 |
| 1842 | 35.0 | 38.3 | 46.6 | 52.3 | 58.8 | 66.8 | 75.9 | 72.3 | 64.4 | 53.0 | 38.6 | 32.6 | 52.88 |
| 1843 | 38.5 | 28.5 | 30.0 | 51.1 | 60.0 | 71.0 | 74.4 | 75.2 | 68.7 | 52.0 | 40.6 | 33.9 | 51.99 |
| 1844 | 27.1 | 32.1 | 42.9 | 56.7 | 65.6 | 69.5 | 75.2 | 73.6 | 66.5 | 53.4 | 43.5 | 34.6 | 53.39 |
| 1845 | 37.1 | 34.6 | 44.7 | 52.0 | 59.8 | 71.5 | 76.2 | 74.6 | 65.6 | 55.8 | 45.6 | 58.8 | 56.36 |
| 1846 | 33.3 | 29.6 | 42.8 | 53.2 | 64.0 | 68.7 | 74.8 | 74.8 | 70.8 | 55.2 | 49.7 | 35.8 | 54.39 |
| 1847 | 33.2 | 33.4 | 38.8 | 52.2 | 61.7 | 70.5 | 76.4 | 73.4 | 65.9 | 54.0 | 48.4 | 39.4 | 53.94 |
| 1848 | 36.7 | 33.7 | 39.4 | 54.4 | 65.8 | 73.5 | 74.8 | 74.5 | 64.8 | 56.0 | 41.0 | 43.2 | 54.82 |
| 1849 | 29.0 | 27.5 | 42.6 | 50.6 | 58.4 | 73.5 | 74.7 | 74.4 | 65.4 | 55.2 | 51.6 | 34.4 | 53.11 |
| 1850 | 35.8 | 37.1 | 39.4 | 48.2 | 57.8 | 72.0 | 77.4 | 73.0 | 67.0 | 56.0 | 48.0 | 36.4 | 54.01 |
| 1851 | 35.2 | 39.8 | 43.5 | 52.0 | 62.6 | 70.4 | 76.8 | 72.4 | 67.4 | 56.6 | 41.8 | 30.0 | 54.04 |
| 1852 | 27.5 | 34.2 | 40.8 | 46.6 | 63.3 | 71.8 | 77.0 | 72.2 | 64.8 | 58.2 | 43.2 | 41.8 | 53.45 |
| 1853 | 33.2 | 37.4 | 43.1 | 52.4 | 63.4 | 73.8 | 75.4 | 74.6 | 68.5 | 53.4 | 47.9 | 35.1 | 54.85 |
| 1854 | 32.4 | 34.6 | 43.0 | 51.2 | 65.9 | 72.0 | 78.8 | 75.8 | 69.6 | 58.8 | 45.4 | 30.9 | 54.87 |
| 1855 | 35.3 | 27.6 | 39.0 | 52.2 | 61.4 | 70.2 | 78.4 | 73.0 | 67.6 | 53.9 | 48.0 | 36.8 | 53.62 |
| 1856 | 24.2 | 26.2 | 33.0 | 53.4 | 60.0 | 74.4 | 79.6 | 72.8 | 67.3 | 55.6 | 45.4 | 32.6 | 52.04 |
| 1857 | 22.4 | 41.0 | 39.0 | 45.6 | 60.8 | 69.2 | 75.0 | 73.2 | 66.9 | 55.8 | 44.8 | 40.3 | 52.83 |
| 1858 | 39.8 | 29.4 | 39.8 | 51.7 | 59.1 | 75.2 | 78.0 | 73.6 | 66.0 | 59.1 | 41.9 | 37.5 | 54.26 |
| 1859 | 34.0 | 37.0 | 48.3 | 50.8 | 63.9 | 69.2 | 73.6 | 73.4 | 66.2 | 52.6 | 47.5 | 32.8 | 54.11 |
| 1860 | 33.1 | 32.7 | 45.2 | 50.2 | 64.4 | 71.0 | 75.9 | 75.0 | 65.6 | 56.7 | 46.8 | 32.3 | 54.08 |
| 1861 | 30.8 | 39.2 | 42.2 | 53.0 | 58.6 | 72.4 | 75.7 | 73.9 | 68.4 | 59.9 | 44.8 | 37.0 | 54.66 |
| 1862 | 32.5 | 32.7 | 40.2 | 50.6 | 63.8 | 69.2 | 75.2 | 76.7 | 69.3 | 54.4 | 44.4 | 36.1 | 53.76 |
| 1863 | 39.8 | 35.0 | 37.3 | 49.8 | 64.6 | 69.6 | 77.4 | 79.4 | 64.8 | 56.0 | 47.8 | 35.4 | 54.74 |
| 1864 | 33.2 | 36.0 | 40.5 | 50.6 | 67.2 | 71.8 | 77.6 | 79.4 | 65.6 | 54.8 | 45.9 | 36.6 | 54.93 |
| 1865 | 26.8 | 32.6 | 47.8 | 56.6 | 63.4 | 76.8 | 77.8 | 74.8 | 72.4 | 54.8 | 45.2 | 37.4 | 55.53 |
| 1866 | 29.4 | 34.0 | 40.8 | 56.0 | 61.4 | 73.0 | 80.4 | 72.6 | 69.4 | 57.4 | 48.0 | 31.8 | 54.52 |
| 1867 | 25.8 | 40.2 | 38.0 | 54.1 | 59.4 | 72.2 | 76.6 | 75.0 | 68.2 | 57.6 | 47.8 | 31.8 | 53.89 |
| 1868 | 29.5 | 26.6 | 41.1 | 48.2 | 59.6 | 72.0 | 81.4 | 77.4 | 68.7 | 54.0 | 46.8 | 32.2 | 53.13 |
| 1869 | 37.0 | 37.6 | 39.4 | 54.4 | 61.5 | 73.6 | 76.6 | 76.0 | 68.6 | 52.5 | 41.3 | 37.4 | 54.66 |
