It's not climate science, it's mathematics. The probability of a specific number being the highest in a sequence goes down rapidly as the number of items increases. And it's not like the temperature is doubling every year, either.
That's only true for a stationary series, which temperature isn't. For a random walk series you can have a 50% chance of each new observation being the highest ever in the series. For a trended series it can be higher than 50%.
As we did last year, use this thread to make predictions for the next year and next decade, with probabilities attached when practical.
Happy New Year, Less Wrong!