FWIW: This table went around a while back. The footnote says the units are in fps per degree F.
So for example, it shows TAC at 0.91 fps/degF, which roughly agrees with the above posts.
Lets assume the OP was doing his work in 90 degree summer, and got 3000 fps.
If he shoots in 60 degree weather, then the math looks like 3000 - ((90-60)*0.91) = 3000 - 27.3 = 2972.7 fps
If the OP is shooting at say 300 yards, it would most likely be negligible. If he is shooting at 600 or beyond, then it barely starts to show.
The WOA SPR bbl is a pretty good one and not real sensitive to small changes like this one from a harmonics view. It would amount to roughly 0.3 MOA vertical difference at 600 yards.
I would make two suggestions. One would be to go ahead and keep range notes along with your reloading diary and note the climate and any differences in target performance. Second would be to also take some velocity data along with those in order to see if your batch to batch consistency is partly to blame as well as to see the effects of temperature on your loads.
It takes some discipline in loading to keep the average velocity of a batch the same as well as keep the ES/SD tight. Keep the faith and work on the discipline and you will get there. YMMV