Internet gets worse when temperature goes low.

My Internet gets worse when temperature goes low. Right now my modem shows Channel ID 122 121 123 124 Frequency 819000000 Hz 813000000 Hz 825000000 Hz 831000000 Hz Signal to Noise Ratio 29 dB 29 dB 29 dB 29 dB Downstream Modulation QAM256 QAM256 QAM256 QAM256 Power Level The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading 13 dBmV 13 dBmV 14 dBmV 14 dBmV These values will get worse as the night goes on and will most likely be offline in the morning. Last night around 9:30 I only had two out of the four channels showing. Any thoughts?