Dataset contains bottom temperature data from lobster traps sites in the Gulf of Maine and the South New England Bight. The hourly time series begins in 2001 at over 100 fixed locations where commercial lobstermen have placed their traps. The water depths range from 1- 405 meters. The variability associated with tidal, wind, seasonal, and inter-annual processes can be depicted at nearly all sites in this multi-year time series. This data was collected as part of the Environmental Monitors on Lobster Traps (eMOLT) project - a non-profit collaboration of industry, science and academics devoted to the monitoring of the physical environment of the Gulf of Maine and the Southern New England Shelf.