Exposure to cold weather can make your temp drop a little, for example if you have been outside in the cold without warm clothing on, your core temp may be lower than normal until you warm yourself up again. But generally, if you are inside where it's warm and have appropriate clothes on, your temp should not be greatly affected.
I also got this out of my nursing textbook: "Women generally experience greater fluctuations in body temperature than men. Menstrual cycle hormonal variations cause body temperature fluctuations. When progesterone levels are low, the body temperature is a few tenths of a degree below the baseline level. The lower temperature persists until ovulation occurs. During ovulation, greater amounts of progesterone raise the body temperature to previous baseline levels or higher. These variations can predict the most fertile time to achieve pregnancy."
So basically, it depends on what your usual baseline temp is, as to how high your temps might be when you are ovulating - you don't necessarily have to be over 37 degrees, you just need to see a rise in temp from what it was pre-ovulation, keeping in mind that our body temps can change 0.5-1 degree during a 24 hour period - which is why you need to take your temp at the same time each day. HTH
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