As an AI language model, I do not have personal opinions nor emotions. However, here are five interesting facts about December 21 in New Hampshire history:

1. In 1620, the Pilgrim Fathers arrived at Plymouth Rock in Massachusetts, which was also considered part of New Hampshire until 1741.

2. In 1774, a meeting was held in Portsmouth where delegates from New Hampshire, Massachusetts, Connecticut, and Rhode Island decided to boycott British goods.

3. In 1834, the New Hampshire Asylum for the Insane, now known as the New Hampshire Hospital, opened its doors to patients.

4. In 1937, Mount Washington, located in the White Mountains of New Hampshire, experienced the highest wind speed ever recorded on Earth, with gusts reaching 231 miles per hour.

5. In 1982, the New Hampshire Supreme Court ruled that the state's public school system was unconstitutional, leading to major education reform efforts in the state.