This post refers to my analysis of recorded monthly mean temperature trends at Kosciusko in Mississippi, USA. The station was established in 1889. 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.
Kosciusko is a small town in central Mississippi, USA. The town is about 300 km north of the Gulf of Mexico.
Over the 1889-2016 period (a period of 128 years) the years are 98% complete.
Kosciusko has a humid sub-tropical climate with hot humid summers and mild-cool winters. Mean monthly temperatures vary from 6.9 degC in January to 26.9 degC in July. Extreme monthly mean temperatures recorded are -0.9 degC (in January 1940) to +29.6 degC (in July 1930).
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 2010 and Lows in about 1900 and 1980.
- The monthly mean temperatures trends around 2000-2010 vary from about zero to 2 degC lower than in about 1930.
- The long-term average trend is about -1 degC/century.
- In most months there is a peak or plateau in the temperature trends around 2000-2010.
- There have been no alarming trends in temperatures in recent decades.
Kosciusko 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.