NOAA's best weather station network for the 48 contiguous states: USCRN, since 2005 = no US warming, and February 2021 was the coldest month, since 2005

Source: 

https://www.ncdc.noaa.gov/temp-and-precip/national-temperature-index/time-series?datasets[]=uscrn&parameter=anom-tavg&time_scale=p12&begyear=2004&endyear=2021&month=3