Peoria, IL (HOI ABC) - We talk about averages a lot during our forecasts, but what are they and why do we use them?
Meteorologists use 30 year averages to show long-term climate trends, and we can use these trends to compare our recent weather to what has happened in the past.
It can also examine what happens throughout the course of a year or a season. For example, Peoria averages 24.6" of snow each year. We can take each winter's snowfall and compare it to that number to see how snowy (or not) that winter season was.
But weather and climate change, so these numbers need to be updated. Every 10 years these 30 year averages are updated to include the last three decades.
Our previous averages went from 1981-2010, but new numbers were released today for 1991-2020.
Here is a comparison of some of the old and new averages for Peoria.
This shows that Peoria is getting a little warmer, wetter and snowier.
A few other notes about winter:
- January has overtaken December as our snowiest month. January used to average 6.9" of snow, but now averages 7.7". December dropped from 7.1" to 6.2". February is now our second snowiest month with 6.9" of snow.
- February, March and November all saw slight increases while April saw a slight decrease.
- October went from a trace to 0.1", which means that Peoria averages measurable snowfall for 7 months of the year (Oct. through April).
You can read more about climatological averages here.