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For Chicopee, Massachusetts; the near ASOS [airport, nearest station with hourly data near me]. Darker the color, the more common the temperature is. The temperature bins are 2°F wide [-6°F to -4°F is the first bin, next one is -4°F to -2°F, etc]. Each vertical pixel represents an hour. You can see the diurnal cycle weakens in winter, and there is much more variability. Summer is very similar stable; very little range in hourly temperature. I cut it off at -6°F even if we get colder, because colder happens so infrequently [only last for a few hours on a few days] it'd be too faint to see on the plot. If you look carefully, in the warmer months there's a faint tail of much colder than usual sunrise temperatures but not earlier in the night, clearly radiational cooling.
and for dewpoints. There's little clear pattern of higher dewpoints in day vs night
Yes, some of the pixels look a bit random with adjacent ups and downs; probably from not quite enough years of data and rounding errors.
Frequency of temperature at freezing or warmer in February. 72-76% from 1-5pm. More common at midnight than 8am. Guess this is pretty assumable anyway.
Graph showing average temperatures today for Bidford from weatherspark, this is the best I can find. It's not entirely accurate because our average January highs and lows are 7.6/1.4°C. The high temperature sometimes occurs at night so that might be why.
Graph showing average temperatures today for Bidford from weatherspark, this is the best I can find. It's not entirely accurate because our average January highs and lows are 7.6/1.4°C. The high temperature sometimes occurs at night so that might be why.
7'C for the warmest hour seems almost too high if the average high is 7.6'C.
Warmest hour is more consistent than coldest hour which is why the coldest hour is much warmer than the average low.
Vancouver; site I'm using only had data since 2007; doesn't cover non-American cities well. So looks a bit random looking.
Anchorage, I was getting an odd looking result and then tweaked the binning boundaries, think it looks right. Data since 1953, gridded by 2°F. It gets much darker in the summer months as the variability is much lower, so each 2°F range happens much more often.
And Whitefield, 10 miles to the northwest at about 1000 feet. Great frost hollow, has the most range in temperature of any station I plotted so far; enough to make the -20°F to -30°F range light up
difference plots, implying area lapse rate. Since it's a frost hollow, not quite ideal for measuring lapse rates. It's a good mountain valley - summit measure. The x-ticks mark every 9°F (5°C) difference between the summit and Whitefield; 9°F = 3.13°C/ km. Dry adibatic lapse rate is a 28.2°F difference, you can see a summit - valley difference much higher than above than doesn't happen; occasionally a bit more, guessing on sunny, calm dry days, when the ground heats faster than the air can mix. Dewpoint lapse rate shows much less variability, and with little seasonal variability. Seems more set by physics of the atmosphere? For temperature difference. Positive means Whitefield is warmer than Mt. Washington; negative Mt. Washington is warmer.
Notice dewpoints are always lower at the summit vs the valley.
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