20 below last night!

Here at the office we hit -20.3 for an overnight low...Some other overnight low temps are as follows.
Hayward  -21
Superior -9
Rusk County -15
Eau Claire -12
New Richmond -13
Cumberland  -11 think this is to warm
Rice Lake -13 think this is also to warm
Price County -18
All the above came from Airports except our office reading...
Some readings from our observers....
Brill -21
Haugen -20
Tergo -21
Siren - 18 Airport reported -13