First Freeze of 2011
|Image 1. Click on image for larger version.|
To the right is a map (Image 1) depicting low temperatures observed on the morning of Saturday, October 29, 2011. As can be seen, all locations in the San Angelo CWA fell below 40 degrees with subfreezing temperatures observed across more than half of the area. The coldest temperatures were typically found along the river valleys of the Northwest Hill Country, namely along the Pecan Bayou and San Saba, Llano, and Colorado Rivers.
Many locations in the Big Country remained above freezing and a number of other sites only experienced a light freeze. However, this event may very well served as a killing freeze, representing the end of the growing season, for some of the colder locations.
A freeze during the last week of October is only a week or two ahead of the climatological average. The normal first freeze typically arrives during the first two weeks of November in many locations, as early as October 31 and as late as November 13.
This freeze does not even approach the earliest freeze on record which occurred before October 20 at all sampled sites. Image 2 shows the freeze data for various sites across the San Angelo CWA, including the dates for the average, first and last freeze for each site. Below is the aforementioned freeze data.
|Image 2. Click on image for larger version.|