The HADCET dataset is the longest instrumental record of temperature in the world.
One of the minor problems with HADCET is they calculate anomalies from the 1961-1990 average.
This is HADCET (March Only) with anomalies calculated from the most recent 30 years average: 1981 to 2010.
15 Coldest March’s (pretty ancient company)
| Year | MAR |
| 1674 | 1 |
| 1785 | 1.2 |
| 1748 | 1.8 |
| 1883 | 1.9 |
| 1667 | 2 |
| 1845 | 2 |
| 1786 | 2.1 |
| 1789 | 2.1 |
| 1837 | 2.3 |
| 1747 | 2.5 |
| 1770 | 2.5 |
| 1784 | 2.7 |
| 1892 | 2.7 |
| 2013 | 2.7 |
| 1701 | 2.8 |
sunshine hours 
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