AcuRite Digital Clock + Outdoor Temperature $19.99 w/ Prime s/h

Ships and sold by Amazon

Atomic Clock with Calendar: Always know the correct time, date, and day of the week with exceptional precision on this wireless clock with indoor and outdoor thermometers for home use or business use
Automatic Daylight Saving Time Adjustments: The NIST radio signal from Fort Collins, Colorado, provides precise timekeeping and automatic clock changes every Spring and Fall for DST shifts
Indoor and Outdoor Thermometers: The indoor display's built-in thermometer and outdoor wireless sensor thermometer provide the current temperatures, keeping you aware of indoor and outdoor environmental conditions
Large, Easy-to-Read Display: Easily view the time, date, and your current indoor and outdoor temperatures from across any room in the house or office on this 10.5-inch by 12.5-inch atomic clock
Simple Setup: Install batteries in the indoor clock and use the fold-out stand for tabletop use or the integrated keyhole for simple wall-mounting; install batteries in the outdoor temperature sensor and hang on a tree branch or nail to a post or fence

$20