Precipitation Trends for the past 114 years
We hear all kinds off theories about global warming and precipitation
with a majority of them predicting increasing drought. Here is what
has been happening in New Hampshire.
The monthly
plots from 1895 to 2009 are below along with their calculated
intermediate
term (33 year) and short term (11 year) moving average.
Here is what the last 114 years looks like.
We don't see any drought here. The annual increase in the 11 year running average is 6.14 inches and the 33 year running average is 5.07 inches.
Now lets look at the months
January
The January plots from 1895 to 2009 show the actual with trend lines. The moving average line for the 33 years 11 years are both showing decreasing precipitation.
February
The February plots are showing a slightly decreasing trend for both the 11 and 33 year moving average.
March
The March plots are showing a leveling out since the 1960's for the 11 year moving average and a slight decrease for the 33 year moving average.
April
The April plots are showing a steady 33 moving average since about 1930.
May
The May plots are showing a very slight increase in the 33 year moving average since about 1930.
June
The June trend is currently showing an increase for both the 11 and 33 year moving average since around 1995.
July
The July trend is currently showing an increase for both the 11 and 33 year moving average since around 1980.
August
The August plots were falling until the 1950's and have been increasing since then.
September
The September plots show a declining trend.
October
The October plots show a steady increase for the full data period.
November
The November plots show a slight declining trend since about 1970..
December
And finally the December plots appear to have a some long term cyclical characteristics.
Summary
Summary of the annual average temperature trend by month for the past 100 years for both 11 and 33 year running averages.
