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Perform. plus prince william and duchess katherine are expecting their third child any time soon. and this year's london marathon could be the hottest on record. when we say start, you don't mean start, you mean start. >> symbolically. she'll have a long weekend. she's going to press a big red button and get things going around 10:00 a.m., which by then, things are going to start getting toef inting toasty as f temperatures. we'll talk about how hot we think it's going to get in. this is the way you've been keeping cool. upper 20s the last few days. if you're watching from the united states an...

The hottest on record. >> that is not good. hottest on record for anything really is not good. and in fact this is on the heels of the boston marathon which was one of the coldest on record. so whole different deal. they don't like the heat or the cold. and we'll continue to see temperatures climbing over the next few days. and in fact we are talking about temps in the mid to upper teens through the morning hours. and then eventually will be looking at numbers that will be climbing into the low 20s. and that is what will be dangerous here. but you check this out, this is through the end of the...

Expecting much in the way of snow to melt any time soon. windchills as cold as 30, 36 below zero even at this hour across portions of the northern tier of the country. parts of 22 states now and 62 million people under windchill advisories ranging from 20 below to 45 degrees below zero. those temperatures taking about ten or so minutes of exposed skin to cause permanent damage to your skin. when you look at the temperatures it's unbelievable compable in mars and minnesota. high temperature expected to be minus 8. on mars' surface, the rover sent us a temperature of minus 9. and that arctic air...

Example. take a look at this. going from 54 today, down to 39 for the high temperature on christmas day. now, the cooldown is going to impact areas of the upper midwest. places like minneapolis, green bay. but it also brings chance for snow so when we take a look at a city like chicago, temperatures not too bad, upper 20s and low 30s. victor and rene, we've got a chance for snow on christmas eve, so many people in chicago will be waking up to fresh new snow. >> thanks, allison. still to come. senate democrats had to cave on a daca fix. now the hispanics dreamers are questioning whether they ...

The midwestern united states. not going to be quite as hot. but take a look at washington, d.c. those temperatures bounce up into the low 30s. that is in degrees celsius. to temperatures in the upper 20s for thursday. they continue to bounce around over the next several days or so. so much in the way of heat relief going into monday for chicago. temperatures in the 70s but right back up again. george, it's not going to be long term. back to you. >> thank you. that wraps this hour of "newsroom." i'm george howell at the cnn world headquarters in atlanta. for our viewers in the united states "...