La Crosse Technology WS-1025 Digital Window Thermometer for $9.75 shipped after coupon code MLC509EN. Here is a screenshot for your reference. This digital outdoor window thermometer mounts flat against window with adhesive strip for outdoor temperature reading and features weather-resistant construction with UV shield protection, clear screen that displays current, maximum, and minimum temperatures to the tenthe of a degree. The maximum and minimum temperatures reset daily. Most places have it for about $14 or more.