Climate
| Climate | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| Daily highs °F | 33 | 36 | 45 | 57 | 69 | 78 | 83 | 81 | 73 | 63 | 49 | 37 |
| Nightly lows °F | 11 | 14 | 24 | 32 | 42 | 51 | 57 | 55 | 47 | 37 | 29 | 17 |
| Precipitation in | 3.3 | 2.9 | 3.6 | 3.9 | 3.5 | 3.2 | 3.3 | 3.4 | 3.5 | 3.5 | 4.6 | 3.7 |
| Check Portsmouth's 7 day forecast at NOAA |
The Seacoast region of NH has a typical New England range, with very cold winters and summers that vary from hot to mildly cold. The most important piece of climate advice when traveling anywhere in the New England region is to prepare for any weather. Rainfall is evenly distributed throughout the year, with rain generally being an all day event, as opposed to short showers. Thunderstorms are rarer then in other parts of the country, but they do occur. The ground is covered with snow usually from late December to March. Snow removal is excellent in the region, with only snowfalls greater then six inches affecting commerce and transportation in the area.
History
The Seacoast region of New Hampshire was first settled in the early 1600's by English fishermen. By the 1630's a permanent settlement was created near Dover, NH. This historical heritage is an integral part of the Seacoast region of NH's character, and is reflected everywhere from its road design to its architecture. Portsmouth, the largest city in the seacoast region, was once one of the busiest ports in America. In 1814 a fire destroyed many of the buildings in Portsmouth, leading to a law requiring all buildings to be brick with slate roofs, creating a charming historical feel to the downtown area. Dover and Exeter thrived off of the success of Portsmouth, especially in the lumber business, supplying ship makers in Portsmouth with lumber for ship making.
The industrial Revolution eventually led Portsmouth and the Seacoast to become less important than neighboring inland cities like Manchester, Nashua, and Keene, but the stagnation meant that the historic character of the Seacoast region was preserved into modern times.
During World War II, because of the importance of Portsmouth's naval yards, the United States bought most of the coastline, closed it to civilians, and transformed it into a military base named Fort Dearborn. In 1961 the state bought the land back from the Federal government, resold some of it, and reopened the rest to visitors and tourists. Remnants of Fort Dearborn can still be seen along the coast.