Annual Temperature Cycles

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

This Demonstration looks at the cycle of temperatures through a calendar year in a certain location. The maximum and minimum daily temperatures are plotted, averaged over a number of years from the starting year to the most recent full year, 2008. Seasonal fluctuation is the most pertinent feature of the plot.

[more]

The cities in the list are the continental U.S. cities for which there are exchange-traded weather contracts. These cover a variety of temperate climates and show seasonal variations typical of the temperate regions in the northern hemisphere.

Including more dates, with the starting year farther in the past, shows the underlying cycles with less noise (year-to-year variation). But it is also worth noting that sampling over decades combines the annual cycles with longer term trends and adds a bias accordingly. For instance, a long-term cooling pattern will bias a displayed long-term average with warmer years from the past. Similarly a long-term warming pattern will bias the displayed average with cooler data from the distant past. So while longer-term calculations may be smoother by signal-to-noise it is worth being aware of this bias from multi-decade trends.

[less]

Contributed by: Jim Gerdy (March 2011)
Open content licensed under CC BY-NC-SA


Snapshots


Details

To keep the calculations simple, the annual averages are not truly averages over all the data in all the included years. In particular the February 29 temperatures in leap years are simply discarded.



Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.
Send