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It should also be noted that the temperature on your instrument cluster does not indicate the temperature of the whole block, only the area where around where it is placed. You will notice the engine warming and cooling if you're only going on short trips because a lot of the engine block can still be pretty cool. When I go on <25-minute drives at below 45 mph in very cold weather, the temperature gauge has a party. It will go up a bar, then drop a bar at a stoplight, then go up, then drop again down a hill. However, when I travel on the highway for a while, the engine doesn't drop from operating temperature at all, even if I sit at a stoplight for 10 minutes in 10-degree weather. Cold weather will have a more direct impact on gas mileage for short trips, but it should average out for longer ones. In general, temperature extremes are not your friend for gas mileage. Neither are short trips.
I've noticed a drop of about 2-8 mpg during the colder months on some of my short routes that are only 5-10 miles. This is because the engine runs pretty much the whole time to keep at temperature, and the cabin requiring heat from the engine means it has to run even more. However, I've seen no noticeable change on one of the longer drives I take frequently (220 miles), in fact, I just got near my record the other day at 41.5 mpg for the trip, and it was 20 degrees Fahrenheit outside. When I was driving around the city after being on the highway that long, the temperature needle didn't budge, because the whole drivetrain was thoroughly warm. I even stopped to pick up food, was out of the car for 30 minutes, and it was still at operating temp when I got back in.
Also, tire pressure, any snow on the ground, how often the car uses AWD, and driving habits, just as MTL_Sienna mentioned, will affect your mileage. If you're still getting this economy when it's warm out, roads are clear, tire pressure is optimal, and you're not driving like a maniac, then I would start asking questions.
2016 RAV4 Hybrid Limited - Technology Package - Mudguards, Rubber Floor Mats, and Door Side Moldings - Full frontal PPF, ready for any road trip.