At Los Angeles, the previous record low for this date was 35, set in 2007. This morning, the record was broken. Only four of January's 31 dates have record lows that have been set since 1950. The new record does not add to the total of "modern" record dates, because it replaces a record that was only six years old.
Looking at January record highs, only 11 out 31 of the dates are occupied from record highs set before 1950. That is more than double the total for record lows, but six of those 11 happened in only two different years.
Such statistics might seem to bolster the claim that the difference was caused by global warming. However, in the case of Los Angeles, the main cause may be urbanization. Yes, that is a form of local human-assisted climate change, but it is not the same as the worldwide effect of greenhouse gases in the atmosphere (such as water vapor, carbon dioxide and methane).
In the I-95 corridor, temperatures are generally in the mild 50s today. A trend toward colder weather took over in the Great Lakes region last night and this morning. At Buffalo, yesterday's high was 65 but is was down to the 30s this morning. At Chicago, it was in the 50s on Friday and Saturday, but never got above 30 degrees yesterday. In the I-95 corridor from D.C. to NYC, fog and low cloudiness helped keep temperatures from getting much above 50 yesterday.
Although somewhat colder air is coming toward the Northeast region, it will not even drop temperatures to long-term average levels, at lest in the Middle Atlantic states. However, much colder air could arrive in these areas next week. In the meantime, the leading edge of the change to colder weather will stall in North Carolina. A couple of fast-moving low pressure areas will run rapidly northeastward along the front. The northwest edge of the precipitation areas from both systems may contain freezing rain, sleet and snow. This video has more. Note: this morning's run of the NAM model shows the second low tracking a little farther north than it was previously. If this is correct, it would suggest only/mostly rain in D.C., Philadelphia and NYC, but perhaps a few inches snow from then middle of Pennsylvania to the Boston area.
Fog can cause traffic accidents and tie up air travel, but it can also create some interesting scenic effects. Yesterday, I took this picture of trees seen through the fog.
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But what about next week?