I put in a request for data from Limestone (and some other sites) and had no luck with beating the -52F or -54F. If you want to look at the data for the fun of it (while it's temporarily still available) here are the links.
HUL https://www.ncdc.noaa.gov/orders/isd/72703399999-1943-02_4293847657710dat.html https://www.ncdc.noaa.gov/orders/isd/72703399999-1943-02_3085127657709dat.html https://www.ncdc.noaa.gov/orders/isd/72703399999-1943-02_5776307657714dat.html
PQI https://www.ncdc.noaa.gov/orders/isd/72713014604-1943-02_1867547657715dat.html
BGR https://www.ncdc.noaa.gov/orders/isd/72607099999-1943-02_7875057657716dat.html
LIZ https://www.ncdc.noaa.gov/orders/isd/72712514623-1957-01_3553737658774dat.html https://www.ncdc.noaa.gov/orders/isd/72712514623-1982-01_9431147658772dat.html https://www.ncdc.noaa.gov/orders/isd/72712514623-1984-01_757727658775dat.html https://www.ncdc.noaa.gov/orders/isd/99999994645-2009-01_7434377658776dat.html https://www.ncdc.noaa.gov/orders/isd/99999994645-2009-01_6307047658777dat.html https://www.ncdc.noaa.gov/orders/isd/72712514623-1980-12_791517658784dat.html https://www.ncdc.noaa.gov/orders/isd/72712514623-1981-01_8358887658786dat.html https://www.ncdc.noaa.gov/orders/isd/72712514623-1988-01_839277658787dat.html https://www.ncdc.noaa.gov/orders/isd/99999994645-2004-01_8407227658804dat.html