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Is there a good chart of the geothermal gradient but near the surface? I haven't been able to find one because they are primarily studied at larger depths, but I would like to know the equilibria at different depths within 1 kilometer.

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The trouble with geothermal gradients is they are not the same everywhere. It is generally accepted that the geothermal gradient is 25-30 °C/km but there can be local variations. In South Australia the gradient is generally 30° C/km, but in the deeper parts of the Cooper Basin the gradient is 55-60 °C/km. Elsewhere, at a depth of 200 ft the temp is 11 C. In the UK the average geothermal gradient is 26 °C/km, but locally it can be in excess of 35°C/km.

With near surface depths, the ground temperature will vary with depth according to the time of day.

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So to get an accurate geothermal map for your region would require localized data.

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