In an article “The Sun Talks to the Trees Too” In Roger’s blog the question is raised of whether the 22 year Hale double sunspot cycle is visible in temperature records.
Looking at the longest thermometer temperature record, English temperatures since 1659, there is a cycle which was previously identified as about 24 years. Here is the part of the spectrum between 10 and 100 years:
The 23.886 year period found would have an uncertainty of about 0.2 years over the 350 year span of the data. This is rather too long to be the Hale double sunspot cycle which averages 22.2 years. However there is clearly a bump on the right shoulder of the peak in the spectrum that might be our Hale cycle.
So the 23.886 year cycle was removed from the data and the spectrum of the result was recalculated:
The peak hiding in the right shoulder has a period of 22.6 years. Its period will be less accurate because of interference effects from the dominant peak so that it could possibly be the 22.2 year cycle.
However there is still the issue as to what the longer cycle represents. The two cycles make beats in about 420 years, just a little longer than our data. This means that it is not possible to say what happens longer term with such cycles. So, while it is possible that the Hale cycle is present in temperatures, it is a long way from being established that this is so.