Londonderry is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water. The water temperature experience significant seasonal variation, with the warmer period lasting from June to September.
In a typical day in June, the temperature ranges from an average high of 83°F to an average low of 56°F. This is considered warm to hot weather, and some would even describe it as comfortably humid.
During the month of June, there are an average of 11.7 hours of sunshine per day. The shortest amount of sunshine is observed in December with only 9.0 hours of daylight.
On average, the humidity in Londonderry is moderate throughout the year. Typically, the most humid time of the year occurs in January, with a relative humidity of 90%. During the remainder of the year, the humidity drops to an average of 75%.
In Londonderry, there is a 36% chance that it will rain or snow on any given day. The chances of rain or snow increase as the month progresses, with May having the highest chance and getting the most precipitation. In a typical day in June, it will rain or snow for an average of 0.45 inches (11.4 mm). The most common form of precipitation is rain alone, with snow only occurring on a few days each year. If the climate data are available for your location, you can customize this graph by selecting a different type of precipitation or by choosing to only show rain or snow days.
