The climate in American Samoa

Climate zone: tropics
High humidity and hot temperatures make the weather in American Samoa at times pleasant but also tropical humid. It is yearlong warm or hot. Dued to the lesser rain the best time for traveling is from June to August. Most precipitation falls in January.

Long-term development of temperatures from 1999 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 1 measuring points in order to have actually comparable data over as long a period as possible.
In the years 1999 to 2021 there were only these 1 weather stations in the whole country, which reported continuous temperature values (Pago Pago). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was February 2002 with 29.8 °C. August 2015 was the coldest month with an average temperature of 26.2 °C.
The average annual temperature was about 28.2 °C in the years after 1999 and about 27.9 °C in the last years before 2021. So it has dropped by about 0.3 °C. This trend only applies to the selected 1 weather stations in American Samoa. A considerably more comprehensive evaluation of the global warming has been provided separately.

Data basis: German Weather Service, individual values averaged and supplemented by own elements.