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It depends on the powder you use. Some are more sensitive than others and you can see 1.5-3 fps velocity change for every 1 degree temperature changes. Others are specifically designed to be resistant to change. Those will typically only see 1/2 fps velocity change for every 1 degree temperature changes.
The numbers you see listed in ballistic charts are usually at about 70 degrees. You'd have to see a loss of close to 100 fps to be noticeable at typical hunting ranges.
All things being equal I tend to choose powders that are not effected by temperature changes. The "Normal" temps that I hunt in range from 20-50, but I've hunted in temps in the single digits and as hot as the upper 90's. But by choosing the more stable powders I won't see velocity change enough in those ranges to matter.
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