We do not know with any precision what the actual mean temperature of the planet is at any given time and most of the figures given here are various guesstimations of the «anomaly» (variation from estimated mean for the time of year over some period of the very recent past, commonly 1951 - 1980 but not always). (junksciencearchive.com)
This may require guesstimation — you may not know exactly what your flight will cost, for example. (policygenius.com)
Join us as we play our yearly Android update wheel of guesstimation game! (androidcentral.com)