This post refers to my analysis of recorded monthly mean temperature trends at Nome in western Alaska, USA. The station was established in 1901. The analysis used raw data (as recorded, without any adjustments) as published by KNMI (the Dutch Meteorological Institute). Polynomial curves of best fit were added to the plots.
Nome is a small town located on Norton Sound, adjoining Bering Strait, in western Alaska, USA.
Over the 1906-2016 period (a period of 111 years) the years are 95% complete.
Nome has a sub-arctic climate with very cold winters and short cool summers. Mean monthly temperatures vary from -14.9 degC (in January) to +10.5 degC (in July). Extreme monthly mean temperatures recorded are -27.4 degC (in February 1990) to +13.6 degC (in August 1977).
Mean, Maximum and Minimum Monthly Temperatures
Plots are shown below for annual mean temperature and the monthly mean temperature for each of the 12 months. A polynomial trendline was fitted to each graph. A comparison of the monthy trendlines are also presented. It should be noted that the trendlines (in red) can sometimes be misleading at either end of the series as the line is very dependent on the temperature values in individual years (this sensitivity does not occur away from the start and end of the series).
Annual Mean Temperatures
Monthly Mean Temperature Trendlines
- The plots show cyclical monthly trendlines in most months, with Highs in about 1930 and 2000 and a Low in about 1960.
- The increase in monthly mean temperatures between 1930 and 2000 was generally between 0.5 degC and 1.5 degC.
- A peak or plateau in the trendline around 2000/2010 is observed to occur in most months.
- The average annual temperature trend since 1906 is about +1.0 degC/century.
- There are no alarming increases in the temperature trendlines in recent decades.
Nome is one of 257 stations, worldwide, for which I have analysed long-term temperature trends. The analyses at 50 representative stations are summarised in the blog post: world-50-temperatures
Please let me know what you think of my analyses. firstname.lastname@example.org
This article was written by Brian Gunter of Narooma, NSW, Australia. In his previous life Brian was an engineering hydrologist involved over many years in the analysis of rainfall and river flow data for the planning of water resources projects in Australia, Asia and Africa. In recent years he has been one of the Marine Rescue NSW (previously Royal Volunteer Coastal Patrol) volunteer weather observers who operate the Narooma station for the Australian Bureau of Meteorology.