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An unpredictable factor in plant growth is certain to relate to proper temperature. An ideal growth temperature is in the region of 70 to 80° F, although certain situations could mean temperatures are higher. It is often seen that a plant is able to soak up more light with the higher temperature range, such as a high of 90° F. High CO2 and light levels might even make this temperature range increase to 95°, which is certain to help with increasing the rate of growth. At 95° F the environment is likely to include the ideal venting to lower humidity levels, good CO2 levels, and very high lighting. It isn't certain if the high temperatures are likely to limit the potency in the harvest. It might be beneficial to look at lowering the temperature range once the plants have been able to achieve the flowering stage. This is certain to help with preserving the overall potency. In the ideal conditions it is certainly possible to increase the rate the plants are able to develop vegetatively. 

In an environment with the regular CO2 levels in a space that is well vented, a range of 90°F is certain to be in the maximum limit, while you might find that the 85° is more likely to be in the optimal range. Avoid letting the temperature exceed 95° F since this is certain to have a negative impact on growth. An optimal range is in the region of 80 to 86°F if you have the ideal lighting. A temperature below 70°F is very likely to be too low to promote healthy growth. 

A lower temperature range outside of 60°F is likely to be acceptable, but going any lower isn't likely to be beneficial for the plant life. A mid 50° F range is likely to result in shock and the 40° F range might leave the plants dead after regular exposure. Make certain to keep plants warm if wishing to maintain the overall health. Elevate pots on slabs or similar cold services if you believe the heat is being sucked into the ground. 

A higher temperature range offers the chance for the air to maintain more water, which should relate to less humidity and this means that a high temperature range could result in a lower chance of a fungus outbreak.

In most situations high humidity is only able to benefit the plant life in the rooting and germination stage. A low humidity level helps with the plant transpiring CO2 and lowering the risk of molds developing on the flowers. 

Latest research shows that bud potency is likely to reduce with the higher temperature range, so it is highly beneficial if you are able to make certain that the plants aren't able to get excessively hot throughout the flowering stage.