--------+---------+---------+-------------+------------- 1. | 2. | 3. | 4. | 5. | | | | Period,| Date of | No. |Winters with | 50 years| Wine |of Severe|Ice on Danish| Remarks. about. | Harvest.| Winters.| coast. | --------+---------+---------+-------------+------------- 825 | | 4 | | 875 | | 7 | | 925 | | 5 | | 975 | | 6 | | 1025 | | 6 | | 1075 | | 10 | | 1125 | | 15 | | Cold winters 1175 | | 10 | | 1225 | | 13 | } | 1275 | | 13 | } | Cold winters 1325 | | 13 | 7 } | 1375 | | 11 | 4 | 1425 | +5 | 13 | 7 | 1475 | +1 | 7 | 2 | Warm 1525 | +2.9 | 10 | 5 | 1575 | +2.2 | 14 | 14 } | 1625 | +4.1 | 17 | 11 } | Cold 1675 | +2.7 | 15 | 14 } | 1725 | +0.1 | 10 | 5 | 1775 | -0.2 | -- | 22 | 1825 | -0.9 | -- | 21 | --------+---------+---------+-------------+------------- The date of the break up of the River Dwina at Mitau was recorded intermittently from 1530 to 1709, and regularly since that date, and the figures have been discussed by Rykatchef. Recasting them in our unit of fifty years we find the mean dates to be: ----------+----------+-----------+----------+-----------+---------- 1551-1600 | 1601-50 | 1651-1700 | 1701-50 | 1751-1800 | 1801-50 March 29 | March 30 | March 5 | March 26 | March 26 | March 28 ----------+----------+-----------+----------+-----------+---------- This again points to a cold period about the beginning of the seventeenth century.