a climate study of daily temperature change from the previous day

A Climate Study of Daily Temperature Change

From the Previous DayBy Matt Masek

14th High Plains AMS/NWA Conference

Outline

• Data• Monthly Statistics• Effects of Precipitation• Strong Frontal Passages• Extreme Values• Final Thoughts

Data

• North Platte (LBF) Daily Observation• 111 Years or 40,542 Days– July 1, 1899 (June 30,1899) to June 30, 2010

• Day 2 Compared To Day 1 (D2-D1=X)– Highs– Lows– Average Temperature (no rounding)

• X can be Positive, Negative, or 0 (Equal)

High TemperaturesMonth Total Days Positive D2-D1 Negative D2-D1 Equal D2-D1

Jan 3,441 1,697 49.3% 1,579 45.9% 165 4.8%

Feb 3,135 1,605 51.2% 1,410 45.0% 120 3.8%

Mar 3,441 1,809 52.6% 1,516 44.1% 116 3.4%

Apr 3,330 1,763 52.9% 1,457 43.8% 110 3.3%

May 3,441 1,840 53.5% 1,446 42.0% 155 4.5%

Jun 3,330 1,751 52.6% 1,389 41.7% 190 5.7%

Jul 3,441 1,768 51.4% 1,475 42.9% 198 5.8%

Aug 3,441 1,743 50.7% 1,469 42.7% 229 6.7%

Sep 3,330 1,666 50.0% 1,512 45.4% 152 4.6%

Oct 3,441 1,728 50.2% 1,587 46.1% 126 3.7%

Nov 3,330 1,624 48.8% 1,578 47.4% 128 3.8%

Dec 3,441 1,632 47.4% 1,644 47.8% 165 4.8%

Yr Total 40,542 20,626 50.9% 18,062 44.6% 1,854 4.6%

January February March April May June July August September October November December0.0%

10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

49.3%51.2%

52.6% 52.9% 53.5% 52.6% 51.4% 50.7% 50.0% 50.2%48.8%

47.4%45.9% 45.0% 44.1% 43.8%

42.0% 41.7% 42.8% 42.7%45.4% 46.1%

47.4%

47.8%

4.8% 3.8% 3.4% 3.3% 4.5% 5.7% 5.8% 6.7%4.6% 3.7% 3.8% 4.8%

High Temperatures Day 2 Compared to Day 1

Day2 > Day1 Day2 < Day1 Day2 = Day1

Low TemperaturesMonth Total Days Positive D2-D1 Negative D2-D1 Equal D2-D1

Jan 3,441 1,523 44.3% 1,708 49.6% 210 6.1%

Feb 3,135 1,415 45.1% 1,514 48.3% 206 6.6%

Mar 3,441 1,568 45.6% 1,667 48.4% 206 6.0%

Apr 3,330 1,522 45.7% 1,623 48.7% 185 5.6%

May 3,441 1.568 45.6% 1,674 48.6% 199 5.8%

Jun 3,330 1,533 46.0% 1,573 47.2% 224 6.7%

Jul 3,441 1,526 44.3% 1,600 46.5% 315 9.2%

Aug 3,441 1,485 43.2% 1,676 48.7% 280 8.1%

Sep 3,330 1,395 41.9% 1,733 52.0% 202 6.1%

Oct 3,441 1,447 42.1% 1,772 51.5% 222 6.5%

Nov 3,330 1,402 42.1% 1,710 51.4% 218 6.5%

Dec 3,441 1,479 43.0% 1,752 50.9% 210 6.1%

Yr Total 40,542 17,863 44.1% 20,002 49.3% 2,677 6.6%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

44.3% 45.1% 45.6% 45.7% 45.6% 46.0%44.3% 43.2%

41.9% 42.1% 42.1% 43.0%

49.6%48.3% 48.4% 48.7% 48.6%

47.2% 46.5%48.7%

52.0% 51.5% 51.4% 50.9%

6.1% 6.6% 6.0% 5.6% 5.8% 6.7%9.2% 8.1%

6.1% 6.5% 6.5% 6.1%

Low Temperatures Day 2 Compared to Day 1


Average TemperaturesMonth Total Days Positive D2-D1 Negative D2-D1 Equal D2-D1

Jan 3,441 1,776 51.6% 1,582 46.0% 83 2.4%

Feb 3,135 1,620 51.7% 1,422 45.4% 93 3.0%

Mar 3,441 1,844 53.6% 1,517 44.1% 80 2.3%

Apr 3,330 1,777 53.4% 1,460 43.8% 93 2.8%

May 3,441 1,816 52.6% 1,497 43.5% 128 3.7%

Jun 3,330 1,774 53.3% 1,434 43.1% 122 3.7%

Jul 3,441 1,719 50.0% 1,568 45.6% 154 4.5%

Aug 3,441 1,648 47.9% 1,634 47.5% 159 4.6%

Sep 3,330 1,626 48.8% 1,581 47.5% 123 3.7%

Oct 3,441 1,685 49.0% 1,656 48.1% 100 2.9%

Nov 3,330 1,588 47.7% 1,630 48.9% 112 3.4%

Dec 3,441 1,642 47.7% 1,687 49.0% 112 3.3%

Yr Total 40,542 20,515 50.6% 18,668 46.6% 1,359 3.4%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

51.6% 51.7%53.6% 53.4% 52.8% 53.3%

50.0%47.9% 48.8% 49.0%

47.7% 47.7%46.0% 45.4%

44.1% 43.8% 43.5% 43.1%45.6%

47.5% 47.5% 48.1%

48.9% 49.0%

2.4% 3.0% 2.3% 2.8% 3.7% 3.7% 4.5% 4.6% 3.7% 2.9% 3.4% 3.3%

Average Temperatures Day 2 Compared to Day 1


Precipitation

• Compare Day 1 Received Rain• Compare Day 2 Received Rain• Both Day 1 & Day 2 Received Rain

• Positive• Negative• Neutral (Equal to 0)

High TemperaturesMonth Total Days Positive D2-D1 Negative D2-D1 Equal D2-D1

Jan 3,441 1,697 49.3% 1,579 45.9% 165 4.8%

Feb 3,135 1,605 51.2% 1,410 45.0% 120 3.8%

Mar 3,441 1,809 52.6% 1,516 44.1% 116 3.4%

Apr 3,330 1,763 52.9% 1,457 43.8% 110 3.3%

May 3,441 1,840 53.5% 1,446 42.0% 155 4.5%

Jun 3,330 1,751 52.6% 1,389 41.7% 190 5.7%

Jul 3,441 1,768 51.4% 1,475 42.9% 198 5.8%

Aug 3,441 1,743 50.7% 1,469 42.7% 229 6.7%

Sep 3,330 1,666 50.0% 1,512 45.4% 152 4.6%

Oct 3,441 1,728 50.2% 1,587 46.1% 126 3.7%

Nov 3,330 1,624 48.8% 1,578 47.4% 128 3.8%

Dec 3,441 1,632 47.4% 1,644 47.8% 165 4.8%

Yr Total 40,542 20,626 50.9% 18,062 44.6% 1,854 4.6%

Positive Day 2 High Temp with PrecipMonth Total Days Positive Day 1 Rain Positive Day 2 Rain Positive Both Rain

Jan 1,697 567 33.4% 375 22.1% 228 13.4%

Feb 1,605 617 38.4% 360 22.4% 237 14.8%

Mar 1,809 737 40.7% 441 24.4% 285 15.8%

Apr 1,763 736 41.7% 511 29.0% 302 17.1%

May 1,840 891 48.4% 730 39.7% 451 24.5%

Jun 1,751 846 48.3% 708 40.4% 439 25.1%

Jul 1,768 769 43.5% 644 36.4% 353 20.0%

Aug 1,743 688 39.5% 570 32.7% 303 17.4%

Sep 1,666 575 34.5% 381 22.9% 211 12.7%

Oct 1,728 489 28.3% 260 15.0% 163 9.4%

Nov 1,624 473 29.1% 263 16.2% 158 9.7%

Dec 1,632 503 30.8% 296 18.1% 186 11.4%

Yr Total 20,626 7,891 38.3% 5,539 26.9% 3,316 16.1%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

33.4%

38.4%40.7% 41.7%

48.4% 48.3%

43.5%

39.5%

34.5%

28.3% 29.1%30.8%

22.1% 22.4%24.4%

29.0%

39.7% 40.4%

36.4%

32.7%

22.9%

15.0% 16.2%18.1%

13.4% 14.8% 15.8% 17.1%

24.5% 25.1%

20.0%17.4%

12.7%9.4% 9.7%

11.4%

Positive Day 2 High TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain

Day1 Received Precipitation Day2 Received Precipitation Both Day 1 & 2 Received Precipitation

Negative Day 2 High Temp with PrecipMonth Total Days Negative Day 1 Rain Negative Day 2 Rain Negative Both Rain

Jan 1,579 549 34.8% 747 47.3% 385 24.4%

Feb 1,410 529 37.5% 795 56.4% 404 28.7%

Mar 1,516 607 40.0% 914 60.3% 475 31.3%

Apr 1,457 642 44.1% 887 60.9% 494 33.9%

May 1,446 767 53.0% 925 64.0% 559 38.7%

Jun 1,389 724 52.1% 830 59.8% 500 36.0%

Jul 1,475 691 46.8% 829 56.2% 457 31.0%

Aug 1,469 660 44.9% 768 52.3% 422 28.7%

Sep 1,512 538 35.6% 729 48.2% 374 24.7%

Oct 1,587 410 25.8% 630 39.7% 264 16.6%

Nov 1,578 453 28.7% 671 42.5% 313 19.8%

Dec 1,644 531 32.3% 749 45.6% 356 21.7%

Yr Total 18,062 7,101 39.3% 9,474 52.5% 5,003 27.7%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

34.8%37.5%

40.0%

44.1%

53.0% 52.1%

46.8%44.9%

35.6%

25.8%28.7%

32.3%

47.3%

56.4%

60.3% 60.9%64.0%

59.8%

56.2%

52.3%

48.2%

39.7%42.5%

45.6%

24.4%

28.7%31.3%

33.9%

38.7%36.0%

31.0%28.7%

24.7%

16.6%19.8%

21.7%

Negative Day 2 High TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Equal Day 2 High Temp with PrecipMonth Total Days Equal Day 1 Rain Equal Day 2 Rain Equal Both Rain

Jan 165 58 35.2% 54 32.7% 32 19.4%

Feb 120 50 41.7% 47 39.2% 34 28.3%

Mar 116 53 45.7% 43 37.1% 28 24.1%

Apr 110 55 50.0% 45 40.9% 28 25.5%

May 155 69 44.5% 86 55.5% 46 29.7%

Jun 190 97 51.1% 103 54.2% 62 32.6%

Jul 198 85 42.9% 82 41.4% 38 19.2%

Aug 229 93 40.6% 90 39.3% 55 24.0%

Sep 152 35 23.0% 40 26.3% 16 10.5%

Oct 126 34 27.0% 28 22.2% 18 14.3%

Nov 128 33 25.8% 28 21.9% 16 12.5%

Dec 165 52 31.5% 47 28.5% 24 14.5%

Yr Total 1,854 714 38.5% 693 37.4% 397 21.4%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

35.2%

41.7%

45.7%

50.0%

44.5%

51.1%

42.9%40.6%

23.0%

27.0% 25.8%

31.5%32.7%

39.2%37.1%

40.9%

55.5%

54.2%

41.4%39.3%

26.3%

22.2% 21.9%

28.5%

19.4%

28.3%24.1% 25.5%

29.7%32.6%

19.2%

24.0%

10.5%

14.3%12.5%

14.5%

Equal Day 2 High TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Positive Day 2 Low Temp with PrecipMonth Total Days Positive Day 1 Rain Positive Day 2 Rain Positive Both Rain

Jan 1,523 306 20.1% 434 28.5% 174 11.4%

Feb 1,415 323 22.8% 445 31.4% 187 13.2%

Mar 1,568 371 23.7% 578 36.9% 229 14.6%

Apr 1,522 392 25.8% 631 41.5% 259 17.0%

May 1,568 562 35.8% 815 52.0% 392 25.0%

Jun 1,533 596 38.9% 744 48.5% 387 25.2%

Jul 1,526 535 35.1% 680 44.6% 320 21.0%

Aug 1,485 476 32.1% 627 42.2% 291 19.6%

Sep 1,395 274 19.6% 444 31.8% 170 12.2%

Oct 1,447 184 12.7% 376 26.0% 122 8.4%

Nov 1,402 227 16.2% 384 27.4% 140 10.0%

Dec 1,479 284 19.2% 431 29.1% 171 11.6%

Yr Total 17,863 4,530 25.4% 6,589 36.9% 2,842 15.9%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

20.1%22.8% 23.7%

25.8%

35.8%38.9%

35.1%32.1%

19.6%

12.7%16.2%

19.2%

28.5%31.4%

36.9%

41.5%

52.0%48.5%

44.6%42.2%

31.8%

26.0%27.4%

29.1%

11.4%13.2% 14.6%

17.0%

25.0% 25.2%

21.0% 19.6%

12.2%8.4%

10.0%11.6%

Positive Day 2 Low TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Negative Day 2 Low Temp with PrecipMonth Total Days Negative Day 1 Rain Negative Day 2 Rain Negative Both Rain

Jan 1,708 799 46.8% 666 39.0% 429 25.1%

Feb 1,514 794 52.4% 682 45.0% 443 29.3%

Mar 1,667 933 56.0% 723 43.4% 500 30.0%

Apr 1,623 937 57.7% 720 44.4% 499 30.7%

May 1,674 1,061 63.4% 803 48.0% 584 34.9%

Jun 1,573 945 60.1% 770 49.0% 530 33.7%

Jul 1,600 848 53.0% 716 44.8% 429 26.8%

Aug 1,676 840 50.1% 679 40.5% 417 24.9%

Sep 1,733 796 45.9% 630 36.4% 387 22.3%

Oct 1,772 689 38.9% 482 27.2% 281 15.9%

Nov 1,710 671 39.2% 514 30.1% 315 18.4%

Dec 1,752 738 42.1% 600 34.2% 365 20.8%

Yr Total 20,002 10,051 50.2% 7,985 39.9% 5,179 25.9%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

46.8%

52.4%

56.0%57.7%

63.4%60.1%

53.0%50.1%

45.9%

38.9% 39.2%42.1%

39.0%

45.0%43.4% 44.4%

48.0% 49.0%

44.8%

40.5%

36.4%

27.2%30.1%

34.2%

25.1%

29.3% 30.0% 30.7%

34.9% 33.7%

26.8%24.9%

22.3%

15.9%18.4%

20.8%

Negative Day 2 Low TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Equal Day 2 Low Temp with PrecipMonth Total Days Equal Day 1 Rain Equal Day 2 Rain Equal Both Rain

Jan 210 69 32.9% 76 36.2% 42 20.0%

Feb 206 79 38.3% 75 36.4% 45 21.8%

Mar 206 93 45.1% 97 47.1% 59 28.6%

Apr 185 104 56.2% 92 49.7% 66 35.7%

May 199 104 52.3% 123 61.8% 80 40.2%

Jun 224 126 56.3% 127 56.7% 84 37.5%

Jul 315 162 51.4% 159 50.5% 99 31.4%

Aug 280 125 44.6% 122 43.6% 72 25.7%

Sep 202 78 38.6% 76 37.6% 44 21.8%

Oct 222 60 27.0% 60 27.0% 42 18.9%

Nov 218 61 28.0% 64 29.4% 32 14.7%

Dec 210 64 30.5% 61 29.0% 30 14.3%

Yr Total 2,677 1,125 42.0% 1,132 42.3% 695 26.0%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

32.9%

38.3%45.1%

56.2%

52.3%

56.3% 51.4%

44.6%

38.6%

27.0%

28.0%

30.5%

36.2%

36.4%

47.1% 49.7%

61.8%

56.7%

50.5%

43.6%

37.6%

27.0%

29.4%

29.0%

20.0% 21.8%

28.6%

35.7%

40.2%

37.5%

31.4%

25.7%21.8%

18.9%

14.7% 14.3%

Equal Day 2 Low TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Positive Day 2 Avg Temp with PrecipMonth Total Days Positive Day 1 Rain Positive Day 2 Rain Positive Both Rain

Jan 1,776 504 28.4% 419 23.6% 212 11.9%

Feb 1,620 546 33.7% 396 24.4% 229 14.1%

Mar 1,844 650 35.2% 502 27.2% 269 14.6%

Apr 1,777 661 37.2% 561 31.6% 295 16.6%

May 1,816 796 43.8% 783 43.1% 423 23.3%

Jun 1,774 800 45.1% 786 44.3% 457 25.8%

Jul 1,719 686 39.9% 677 39.4% 355 20.7%

Aug 1,648 602 36.5% 595 36.1% 296 18.0%

Sep 1,626 477 29.3% 435 26.8% 204 12.5%

Oct 1,685 385 22.8% 308 18.3% 160 9.5%

Nov 1,588 389 24.5% 294 18.5% 145 9.1%

Dec 1,642 438 26.7% 349 21.3% 185 11.3%

Yr Total 20,515 6,934 33.8% 6,105 29.8% 3,230 15.7%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

28.4%

33.7%35.2%

37.2%

43.8% 45.1%

39.9%36.5%

29.3%

22.8%24.5%

26.7%

23.6% 24.4%27.2%

31.6%

43.1%44.3%

39.4%

36.1%

26.8%

18.3% 18.5%21.3%

11.9%14.1% 14.6%

16.6%

23.3%25.8%

20.7%18.0%

12.5%9.5% 9.1%

11.3%

Positive Day 2 Average TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Negative Day 2 Avg Temp with PrecipMonth Total Days Negative Day 1 Rain Negative Day 2 Rain Negative Both Rain

Jan 1,582 636 40.2% 727 46.0% 413 26.1%

Feb 1,422 611 43.0% 771 54.2% 428 30.1%

Mar 1,517 715 47.1% 868 57.2% 505 33.3%

Apr 1,460 728 49.9% 839 57.5% 504 34.5%

May 1,497 865 57.8% 898 60.0% 590 39.4%

Jun 1,434 810 56.5% 807 56.3% 516 36.0%

Jul 1,568 774 49.4% 811 51.7% 451 28.8%

Aug 1,634 777 47.6% 761 46.6% 445 27.2%

Sep 1,581 631 39.9% 685 43.3% 381 24.1%

Oct 1,656 519 31.3% 590 35.6% 276 16.7%

Nov 1,630 545 33.4% 649 39.8% 332 20.4%

Dec 1,687 619 36.7% 717 42.5% 367 21.8%

Yr Total 18,668 8,230 44.1% 9,123 48.9% 5,208 27.9%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

40.2%43.0%

47.1%49.9%

57.8%

56.5%

49.4%47.6%

39.9%

31.3%33.4%

36.7%

46.0%

54.2%57.2% 57.5%

60.0%

56.3% 51.7%

46.6%43.3%

35.6%

39.8%42.5%

26.1%

30.1%33.3% 34.5%

39.4%36.0%

28.8%27.2%

24.1%

16.7%

20.4% 21.8%

Negative Day 2 Average TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Equal Day 2 Avg Temp with PrecipMonth Total Days Equal Day 1 Rain Equal Day 2 Rain Equal Both Rain

Jan 83 34 41.0% 30 36.1% 20 24.1%

Feb 93 39 41.9% 35 37.6% 18 19.4%

Mar 80 32 40.0% 28 35.0% 14 17.5%

Apr 93 44 47.3% 43 46.2% 25 26.9%

May 128 66 51.6% 60 46.9% 43 33.6%

Jun 122 57 46.7% 48 39.3% 28 23.0%

Jul 154 85 55.2% 67 43.5% 42 27.3%

Aug 159 62 39.0% 72 45.3% 39 24.5%

Sep 123 40 32.5% 30 24.4% 16 13.0%

Oct 100 29 29.0% 20 20.0% 9 9.0%

Nov 112 25 22.3% 19 17.0% 10 8.9%

Dec 112 29 25.9% 26 23.2% 14 12.5%

Yr Total 1,359 542 39.9% 478 35.2% 278 20.5%


10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

41.0% 41.9%40.0%

47.3%

51.6%

46.7%

55.2%

39.0% 32.5%

29.0%

22.3%25.9%

36.1%37.6%

35.0%

46.2% 46.9%

39.3%

43.5%

45.3%

24.4%

20.0%17.0%

23.2%24.1%

19.4% 17.5%

26.9%

33.6%

23.0%

27.3%24.5%

13.0%

9.0% 8.9%12.5%

Equal Day 2 Average TemperaturesDay 1 with Rain, Day 2 with Rain, Both Day 1 & 2 with Rain


Frontal Passage

• Cold Front– Day 2 High within 1 degree of Day 1 Low– 573 Frontal Passages

• Warm Front– Day 2 Low within 1 degree of Day 1 High– 95 Frontal Passages

Cold Front (Change in Max Temp)Month -40+ -30 to -39 -20 to -29 -10 to -19 0 to -9 Total Tot %

January 1 16 20 24 11 72 12.6%

February 2 7 15 33 20 77 13.4%

March 1 7 19 22 20 69 12.0%

April 0 4 16 23 12 55 9.6%

May 0 1 7 11 9 28 4.9%

June 0 0 5 8 2 15 2.6%

July 0 0 1 6 0 7 1.2%

August 0 0 5 4 0 9 1.6%

September 0 3 13 13 5 34 5.9%

October 0 4 8 16 10 38 6.6%

November 0 2 15 29 27 73 12.7%

December 2 7 15 35 37 96 16.8%

Year Total 6 51 139 224 153 573

Warm Front (Change in Max Temp)Month 0 to 9 10 to 19 20 to 29 30 to 39 40+ Total Tot %

January 4 7 3 1 0 15 15.8%

February 5 3 2 1 0 11 11.6%

March 2 3 3 1 0 9 9.5%

April 1 3 2 0 0 6 6.3%

May 3 5 2 1 0 11 11.6%

June 0 0 1 0 0 1 1.1%

July 0 1 0 0 0 1 1.1%

August 0 0 0 0 0 0 0.0%

September 2 3 1 0 0 6 6.3%

October 1 3 4 1 0 9 9.5%

November 7 6 1 0 0 14 14.7%

December 6 2 3 1 0 12 12.6%

Year Total 31 36 22 6 0 95


2.0%

4.0%

6.0%

8.0%

10.0%

12.0%

14.0%

16.0%

18.0%

20.0%

12.6%13.4%

12.0%

9.6%

4.9%

2.6%

1.2% 1.6%

5.9%6.6%

12.7%

16.8%15.8%

11.6%

9.5%

6.3%

11.6%

1.1% 1.1% 0.0%

6.3%

9.5%

14.7%

12.6%

Cold Frontal Passages & Warm Frontal Passages

Cold Front Passages (573 Fronts) Warm Front Passages (95 Fronts)


2.0%

4.0%

6.0%

8.0%

10.0%

12.0%

14.0%

16.0%

18.0%

20.0%

12.6%13.4%

12.0%

9.6%

4.9%

2.6%

1.2% 1.6%

5.9%6.6%

12.7%

16.8%15.8%

11.6%

9.5%

6.3%

11.6%

1.1% 1.1% 0.0%

6.3%

9.5%

14.7%

12.6%

Cold Frontal Passages & Warm Frontal Passages

Cold Front Passages (573 Fronts) Warm Front Passages (95 Fronts)

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Extreme Daily Changes (Day 2 compared to Day 1)

High Temp Change Low Temp Change Ave Temp Change

Below -49.5 2 0 0

-49.5 to -40 28 0 0

-39.5 to -30 213 6 9

-29.5 to -20 139 171 311

-19.5 to -10 5,031 2,524 3,411

-9 .5 to 0 13,244 19,978 17,655

0.5 to 10 15,319 15,080 18,170

10.5 to 20 4,556 2,591 2,243

20.5 to 30 676 181 97

30.5 to 40 68 10 5

Above 40 7 1 0

-50 -47 -44 -41 -38 -35 -32 -29 -26 -23 -20 -17 -14 -11 -8 -5 -2 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 490

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Day 2 Temperature Change from Day 1

Highs

-50 -47 -44 -41 -38 -35 -32 -29 -26 -23 -20 -17 -14 -11 -8 -5 -2 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 490

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Lows

-50 -47 -44 -41 -38 -35 -32 -29 -26 -23 -20 -17 -14 -11 -8 -5 -2 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 490

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Average T

-50 -47 -44 -41 -38 -35 -32 -29 -26 -23 -20 -17 -14 -11 -8 -5 -2 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 490

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Lows Highs Average T

Final Thoughts (Fun Facts)• High Temperatures– Average Daily Change

• If D2 Warmer → +7.7° (50.9%)• If D2 Colder → -8.8° (44.6%)

• Low Temperatures– Average Daily Change


• Average Temperatures– Average Daily Change


Final Thoughts

• Day 2 High Warmer than Day 1• Day 2 Low Cooler than Day 1• Precip on Day 1– Day 2 High More Likely to be Warmer– Day 2 Low More Likely to be Cooler

• Precip on Day 2– Day 2 High More Likely to be Cooler– Day 2 Low More Likely to be Warmer

• Many More Cold Fronts than Warm Fronts• Fronts Cause ± 10° to 19° Temp Change Most Often

Thank You

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a climate study of daily temperature change from the previous day

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