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Hi Nick. I would bury it if possible or insulate it with rigid insulation and paint the outside black to soak in sunlight. This should work as long as you don't have 6 more weeks of sub freezing temps in a row. Then you would need a Heat source. I looked at your average temps and your yearly average temperature is around 38f. which will also be close to the temp of the ground give or take depending on factors of ground moisture and long periods of extreme freezing temps. Also your annual low is 32 deg. Your water would most likely fluctuate between annual high and low of 45 to 32. Its a start. But don't quote me on this.