Dyersburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dyersburg clear sky chart from 2005-11-06 to 2024-01-17.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
48%
24143
24%
74551
18%
24088
55%
24088
30%
45163

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
28%
950
21%
2648
9%
946
38%
946
27%
1747
January11th to 20thNight
23%
935
21%
2449
8%
935
32%
935
22%
1738
January21st to endNight
27%
990
25%
2574
9%
990
38%
990
30%
1658
February1st to 10thNight
26%
756
19%
2196
8%
756
34%
756
22%
1515
February11th to 20thNight
25%
703
20%
2099
10%
700
33%
700
23%
1396
February21st to endNight
23%
592
22%
1776
8%
592
33%
592
21%
1190
March1st to 10thNight
33%
720
21%
2160
11%
720
40%
720
25%
1389
March11th to 20thNight
31%
594
19%
2034
12%
594
39%
594
21%
1319
March21st to endNight
36%
594
21%
2019
13%
594
46%
594
24%
1276
April1st to 10thNight
37%
540
26%
1800
15%
540
53%
540
30%
1026
April11th to 20thNight
41%
533
26%
1775
20%
533
53%
533
29%
1038
April21st to endNight
41%
540
24%
1800
17%
540
53%
540
27%
1098
May1st to 10thNight
47%
540
21%
1769
17%
540
54%
540
31%
1027
May11th to 20thNight
52%
531
20%
1592
16%
531
56%
531
29%
986
May21st to endNight
65%
583
21%
1621
17%
582
67%
582
33%
998
June1st to 10thNight
66%
540
23%
1440
19%
540
67%
540
34%
920
June11th to 20thNight
79%
540
30%
1440
24%
540
81%
540
51%
782
June21st to endNight
76%
540
26%
1440
20%
540
78%
540
46%
813
July1st to 10thNight
77%
525
20%
1400
19%
525
78%
525
39%
847
July11th to 20thNight
76%
522
23%
1392
22%
522
77%
522
43%
802
July21st to endNight
79%
591
24%
1655
25%
558
79%
558
42%
919
August1st to 10thNight
81%
537
21%
1767
26%
534
81%
534
37%
960
August11th to 20thNight
76%
534
25%
1776
31%
534
77%
534
34%
986
August21st to endNight
76%
594
25%
1980
30%
594
77%
594
34%
1089
September1st to 10thNight
72%
540
28%
1800
31%
540
73%
540
37%
964
September11th to 20thNight
69%
599
31%
1859
30%
599
71%
599
36%
1065
September21st to endNight
66%
720
32%
1980
24%
720
70%
720
45%
1101
October1st to 10thNight
65%
720
32%
2050
27%
720
69%
720
44%
1109
October11th to 20thNight
50%
720
33%
2160
23%
720
60%
720
37%
1221
October21st to endNight
44%
792
28%
2393
21%
792
53%
792
31%
1468
November1st to 10thNight
51%
740
32%
2406
26%
740
61%
740
38%
1281
November11th to 20thNight
41%
760
30%
2470
21%
760
54%
760
35%
1364
November21st to endNight
40%
760
26%
2470
20%
760
49%
760
28%
1464
December1st to 10thNight
33%
783
23%
2493
14%
783
45%
783
23%
1610
December11th to 20thNight
35%
948
24%
3120
13%
948
44%
948
25%
1938
December21st to endNight
26%
1037
13%
4748
9%
1026
35%
1026
14%
3059

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
13%6%35%5%345%5%7%44%
74799
Night
13%6%25%5%3445%7%47%
75041
TransparencyDay
39%6%11%24%17%3
74512
Night
37%5%10%24%20%5%
74850
SeeingDay
14%6%21%25%22%11%
14242
Night
15%6%25%32%19%3
24154

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
18%7%36%5%24436%42%
1517
11th to 20thDay
22%7%36%6%34346%37%
1654
21st to endDay
16%8%34423347%46%
1782
February1st to 10thDay
19%9%36%5%33446%38%
1760
11th to 20thDay
19%9%37%43345%5%38%
1748
21st to endDay
22%9%46%5%35%445%34%
1480
March1st to 10thDay
18%8%35%423446%43%
1800
11th to 20thDay
21%9%36%6%34345%36%
1941
21st to endDay
18%7%46%6%345%5%7%35%
2335
April1st to 10thDay
12%5%25%6%25%45%7%47%
2160
11th to 20thDay
16%6%26%5%3445%6%43%
2134
21st to endDay
15%6%36%6%3445%6%42%
2160
May1st to 10thDay
14%6%35%6%3445%8%41%
2189
11th to 20thDay
12%6%25%5%445%5%9%41%
2301
21st to endDay
7%6%36%7%46%6%8%10%36%
2651
June1st to 10thDay
8%435%5%36%6%7%9%44%
2520
11th to 20thDay
43245%46%6%7%11%49%
2520
21st to endDay
4325%5%35%6%7%11%49%
2520
July1st to 10thDay
6%436%7%5%7%7%8%9%38%
2520
11th to 20thDay
7%4346%45%6%7%12%43%
2520
21st to endDay
7%425%6%36%7%7%10%44%
2561
August1st to 10thDay
6%4146%36%7%9%11%43%
2158
11th to 20thDay
9%6%25%435%5%7%10%43%
2125
21st to endDay
9%5%25%5%35%5%5%9%47%
2376
September1st to 10thDay
10%4245%45%5%7%9%45%
2160
11th to 20thDay
12%6%25%5%3445%7%47%
2081
21st to endDay
10%5%24424446%55%
1980
October1st to 10thDay
9%424433446%58%
1907
11th to 20thDay
13%6%23425%445%53%
1800
21st to endDay
20%6%2431345%5%49%
1962
November1st to 10thDay
11%5%24323335%59%
1672
11th to 20thDay
14%5%245%23446%51%
1710
21st to endDay
18%6%36%434445%44%
1710
December1st to 10thDay
18%8%35%5%34446%39%
1684
11th to 20thDay
15%7%36%6%34445%42%
1918
21st to endDay
15%11%47%7%45%446%34%
2783
January1st to 10thNight
18%7%36%324345%45%
2648
11th to 20thNight
20%8%37%5%34336%38%
2449
21st to endNight
17%6%24423445%47%
2574
February1st to 10thNight
20%9%46%5%2345%6%37%
2196
11th to 20thNight
19%7%26%5%3344442%
2098
21st to endNight
20%7%36%5%34446%39%
1776
March1st to 10thNight
16%7%35%433445%44%
2160
11th to 20thNight
19%8%35%5%35%345%41%
2034
21st to endNight
16%5%35%5%445%6%6%40%
2019
April1st to 10thNight
10%5%35%435%5%6%7%49%
1800
11th to 20thNight
16%5%25%42345%7%48%
1775
21st to endNight
15%5%36%43345%8%45%
1800
May1st to 10thNight
14%5%24424448%49%
1769
11th to 20thNight
11%6%36%5%3446%8%45%
1592
21st to endNight
5%425%6%46%7%7%12%43%
1621
June1st to 10thNight
8%6%35%6%45%5%6%8%46%
1440
11th to 20thNight
4313435%45%9%59%
1440
21st to endNight
32135%25%5%7%13%52%
1440
July1st to 10thNight
4425%5%5%46%8%13%45%
1440
11th to 20thNight
5%4245%345%6%12%50%
1440
21st to endNight
5%3244345%7%10%54%
1752
August1st to 10thNight
3325%5%46%5%7%11%50%
1778
11th to 20thNight
6%325%5%346%7%9%51%
1776
21st to endNight
6%425%5%345%7%9%51%
1980
September1st to 10thNight
9%425%42435%8%54%
1800
11th to 20thNight
9%5%25%5%245%6%7%52%
1859
21st to endNight
9%5%1341345%6%59%
1980
October1st to 10thNight
8%31342345%7%60%
2050
11th to 20thNight
14%5%2333323457%
2160
21st to endNight
18%6%24423345%49%
2393
November1st to 10thNight
12%5%23323346%58%
2406
11th to 20thNight
12%325%42345%6%53%
2470
21st to endNight
15%6%24434446%49%
2470
December1st to 10thNight
19%7%35%434345%43%
2493
11th to 20thNight
16%7%245%3445%5%46%
3279
21st to endNight
16%8%46%6%35%45%6%36%
4884

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
46%48%23%16%3
1518
11th to 20thDay
50%39%22%15%1
1654
21st to endDay
40%311%27%16%3
1782
February1st to 10thDay
48%49%24%14%1
1760
11th to 20thDay
50%49%20%14%3
1758
21st to endDay
53%38%16%14%5%
1480
March1st to 10thDay
44%48%20%18%5%
1800
11th to 20thDay
52%47%21%13%2
1941
21st to endDay
48%5%11%22%13%1
2335
April1st to 10thDay
37%5%10%26%20%2
2160
11th to 20thDay
42%49%22%18%5%
2134
21st to endDay
43%49%26%17%1
2160
May1st to 10thDay
42%6%13%23%15%1
2189
11th to 20thDay
40%7%14%22%16%2
2305
21st to endDay
40%10%16%23%10%2
2651
June1st to 10thDay
35%7%14%23%20%2
2520
11th to 20thDay
27%7%15%29%18%4
2520
21st to endDay
28%8%14%25%20%4
2520
July1st to 10thDay
37%9%15%21%14%4
2451
11th to 20thDay
33%8%16%24%14%5%
2445
21st to endDay
33%8%15%30%13%1
2419
August1st to 10thDay
30%10%19%27%13%1
2145
11th to 20thDay
35%8%13%27%16%3
2125
21st to endDay
33%6%13%25%17%4
2376
September1st to 10thDay
34%7%12%26%18%3
2160
11th to 20thDay
37%5%8%23%23%4
2081
21st to endDay
31%48%24%26%6%
1980
October1st to 10thDay
28%411%24%26%7%
1907
11th to 20thDay
33%47%23%26%8%
1800
21st to endDay
38%5%6%24%22%6%
1962
November1st to 10thDay
30%38%26%26%6%
1672
11th to 20thDay
36%36%23%26%6%
1710
21st to endDay
43%46%22%21%4
1710
December1st to 10thDay
46%5%8%23%16%3
1684
11th to 20thDay
44%49%23%18%3
1915
21st to endDay
51%49%21%12%2
2783
January1st to 10thNight
44%38%24%18%3
2648
11th to 20thNight
51%38%21%16%2
2449
21st to endNight
39%310%26%20%2
2574
February1st to 10thNight
49%49%18%18%2
2196
11th to 20thNight
46%48%22%17%4
2099
21st to endNight
47%48%18%17%6%
1776
March1st to 10thNight
43%47%16%21%9%
2160
11th to 20thNight
46%49%20%17%4
2034
21st to endNight
43%411%24%16%2
2019
April1st to 10thNight
34%5%11%26%20%5%
1800
11th to 20thNight
36%48%22%21%8%
1775
21st to endNight
38%5%8%26%20%3
1800
May1st to 10thNight
35%5%11%27%18%4
1769
11th to 20thNight
37%6%14%23%17%2
1593
21st to endNight
32%9%14%27%15%3
1622
June1st to 10thNight
35%6%11%22%23%2
1440
11th to 20thNight
21%5%14%34%21%5%
1440
21st to endNight
23%7%16%28%19%7%
1440
July1st to 10thNight
28%9%17%28%15%3
1400
11th to 20thNight
26%7%18%27%14%7%
1392
21st to endNight
25%8%18%33%16%1
1655
August1st to 10thNight
27%7%17%31%17%1
1767
11th to 20thNight
28%9%13%28%19%3
1776
21st to endNight
29%7%14%29%17%5%
1980
September1st to 10thNight
28%5%11%28%21%6%
1800
11th to 20thNight
31%5%10%22%28%4
1859
21st to endNight
26%49%26%28%7%
1980
October1st to 10thNight
24%5%9%26%26%10%
2050
11th to 20thNight
32%35%21%29%9%
2160
21st to endNight
39%36%20%24%8%
2393
November1st to 10thNight
29%47%25%28%7%
2406
11th to 20thNight
31%46%23%25%10%
2470
21st to endNight
38%37%23%24%4
2470
December1st to 10thNight
45%38%21%18%4
2493
11th to 20thNight
40%46%25%22%3
3281
21st to endNight
47%5%9%20%14%3
4884

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
25%13%37%20%41
270
11th to 20thDay
29%14%33%19%32
258
21st to endDay
19%14%46%17%4
264
February1st to 10thDay
25%15%38%17%5%2
240
11th to 20thDay
31%17%35%14%3
240
21st to endDay
33%16%31%14%5%
198
March1st to 10thDay
24%13%35%20%7%1
240
11th to 20thDay
25%15%38%18%31
240
21st to endDay
22%14%32%21%10%
421
April1st to 10thDay
15%12%33%28%10%1
420
11th to 20thDay
20%10%30%27%11%2
412
21st to endDay
19%11%31%22%13%3
420
May1st to 10thDay
17%10%28%30%12%3
423
11th to 20thDay
16%321%28%21%11%
447
21st to endDay
10%318%32%23%14%
605
June1st to 10thDay
9%317%24%30%17%
630
11th to 20thDay
4113%35%33%13%
630
21st to endDay
5%117%35%27%15%
630
July1st to 10thDay
6%111%26%30%26%
621
11th to 20thDay
7%310%22%37%22%
618
21st to endDay
8%17%28%35%22%
684
August1st to 10thDay
8%16%27%41%18%
456
11th to 20thDay
15%28%25%35%17%
439
21st to endDay
12%7%20%34%27%
495
September1st to 10thDay
10%18%25%37%19%
450
11th to 20thDay
10%111%19%38%21%
450
21st to endDay
14%413%28%27%14%
450
October1st to 10thDay
10%319%32%28%9%
377
11th to 20thDay
14%5%35%29%13%4
270
21st to endDay
24%10%30%19%14%2
297
November1st to 10thDay
12%8%29%30%17%4
270
11th to 20thDay
10%10%37%30%12%1
270
21st to endDay
22%11%29%23%13%3
270
December1st to 10thDay
23%14%30%24%9%1
270
11th to 20thDay
21%12%34%21%11%1
270
21st to endDay
21%20%33%22%4
297
January1st to 10thNight
22%8%38%27%5%
950
11th to 20thNight
24%13%35%24%4
935
21st to endNight
21%11%38%28%3
990
February1st to 10thNight
23%11%35%26%5%
756
11th to 20thNight
23%11%38%26%2
703
21st to endNight
24%15%35%23%3
592
March1st to 10thNight
19%12%33%33%4
720
11th to 20thNight
23%10%34%28%6%1
594
21st to endNight
17%9%34%29%11%
594
April1st to 10thNight
12%10%37%31%9%1
540
11th to 20thNight
18%8%28%32%12%2
533
21st to endNight
14%7%34%33%11%1
540
May1st to 10thNight
15%6%26%39%12%2
540
11th to 20thNight
14%322%36%22%2
531
21st to endNight
6%218%39%30%4
584
June1st to 10thNight
9%311%42%30%5%
540
11th to 20thNight
3110%45%38%3
540
21st to endNight
412%40%39%4
540
July1st to 10thNight
5%17%31%45%10%
525
11th to 20thNight
5%27%27%49%10%
522
21st to endNight
5%27%30%46%12%
591
August1st to 10thNight
41433%51%7%
537
11th to 20thNight
7%16%36%44%6%
534
21st to endNight
7%5%31%47%9%
594
September1st to 10thNight
10%18%31%42%7%
540
11th to 20thNight
11%19%33%40%8%
599
21st to endNight
11%215%34%33%5%
720
October1st to 10thNight
9%316%36%33%3
720
11th to 20thNight
18%326%35%18%1
720
21st to endNight
21%6%26%32%14%1
792
November1st to 10thNight
13%5%27%37%17%1
740
11th to 20thNight
13%7%34%34%12%1
760
21st to endNight
18%8%30%32%10%1
760
December1st to 10thNight
22%8%30%34%6%
783
11th to 20thNight
22%8%30%32%8%
950
21st to endNight
24%11%32%27%5%
1045
Page generated at 2024-01-14 08:54:58. Version ac07

Copyright 2024 Attilla Danko


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