Some embodiments relate to methods and processes for determining how a range of weather conditions can affect a selected physical parameter of a material. In some embodiments the weather conditions can include relative humidity and/or temperature, and the selected physical parameter can be mass and or dimensions. For instance, some embodiments can be used to estimate the amount of water that a material may be expected to absorb under in-service conditions. In some embodiments the amount of water can defined by a range bounded by amounts observed at opposing extremes of simulated conditions.