Bartlesville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bartlesville clear sky chart from 2005-11-06 to 2024-03-01.

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
44%
24526
25%
79818
16%
24422
53%
24422
32%
45573

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
34%
943
25%
4016
11%
926
46%
926
23%
2289
January11th to 20thNight
30%
949
26%
4012
10%
930
40%
930
24%
2083
January21st to endNight
31%
1036
19%
4481
11%
1023
42%
1023
21%
2711
February1st to 10thNight
25%
950
21%
2470
6%
950
33%
950
27%
1653
February11th to 20thNight
30%
823
22%
2298
9%
819
38%
819
30%
1408
February21st to endNight
27%
600
27%
1856
9%
600
42%
600
29%
1082
March1st to 10thNight
32%
542
26%
1986
16%
542
44%
542
26%
1110
March11th to 20thNight
32%
540
21%
1980
15%
540
42%
540
25%
1141
March21st to endNight
26%
594
19%
2178
11%
594
38%
594
22%
1316
April1st to 10thNight
29%
540
23%
1967
14%
540
44%
540
29%
1051
April11th to 20thNight
31%
533
22%
1775
13%
533
45%
533
27%
1038
April21st to endNight
31%
540
23%
1631
13%
540
45%
540
29%
1003
May1st to 10thNight
36%
540
20%
1620
14%
540
47%
540
27%
1024
May11th to 20thNight
47%
531
22%
1594
20%
531
53%
531
31%
963
May21st to endNight
49%
584
19%
1745
15%
582
56%
582
30%
1078
June1st to 10thNight
65%
540
20%
1620
16%
540
69%
540
39%
891
June11th to 20thNight
62%
540
22%
1620
17%
540
66%
540
44%
849
June21st to endNight
62%
540
25%
1620
21%
540
67%
540
50%
808
July1st to 10thNight
72%
525
19%
1575
20%
525
74%
525
41%
877
July11th to 20thNight
77%
522
25%
1566
26%
522
80%
522
51%
771
July21st to endNight
75%
591
27%
1673
31%
558
77%
558
42%
909
August1st to 10thNight
75%
537
23%
1601
24%
534
78%
534
44%
844
August11th to 20thNight
70%
534
28%
1600
31%
534
73%
534
38%
910
August21st to endNight
78%
594
30%
1895
34%
594
79%
594
46%
930
September1st to 10thNight
66%
540
26%
1922
29%
540
69%
540
36%
996
September11th to 20thNight
61%
540
25%
1980
25%
540
66%
540
30%
1089
September21st to endNight
64%
540
33%
1980
31%
540
70%
540
39%
946
October1st to 10thNight
54%
641
31%
2081
23%
641
61%
641
41%
1081
October11th to 20thNight
39%
720
32%
2160
16%
720
51%
720
40%
1169
October21st to endNight
39%
792
29%
2376
15%
792
50%
792
34%
1366
November1st to 10thNight
41%
748
34%
2228
16%
748
56%
748
43%
1172
November11th to 20thNight
37%
950
29%
2470
12%
950
48%
950
41%
1425
November21st to endNight
38%
950
28%
2470
13%
950
47%
950
36%
1499
December1st to 10thNight
36%
950
28%
2470
11%
950
47%
950
34%
1535
December11th to 20thNight
32%
949
27%
2881
10%
948
42%
948
27%
1768
December21st to endNight
30%
1038
18%
4421
10%
1026
42%
1026
19%
2788

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
12%6%25%43445%7%48%
78929
Night
11%5%24424446%53%
80542
TransparencyDay
35%6%12%24%18%4
78653
Night
32%6%11%24%22%5%
80337
SeeingDay
13%9%27%29%19%4
14484
Night
13%9%31%33%13%1
24551

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
14%8%46%5%24346%45%
2847
11th to 20thDay
9%7%26%6%34446%48%
2850
21st to endDay
18%13%34323235%44%
3135
February1st to 10thDay
15%9%46%5%34336%42%
1710
11th to 20thDay
13%6%36%433446%48%
1784
21st to endDay
13%9%26%5%34446%45%
1598
March1st to 10thDay
14%6%35%424446%48%
1980
11th to 20thDay
18%9%34323435%44%
1980
21st to endDay
19%8%37%5%35%446%36%
2178
April1st to 10thDay
10%6%35%5%245%6%7%48%
1993
11th to 20thDay
15%6%25%5%3445%8%42%
2134
21st to endDay
19%8%36%5%24445%41%
2326
May1st to 10thDay
19%6%35%445%446%41%
2340
11th to 20thDay
13%7%36%5%345%5%8%41%
2302
21st to endDay
14%6%36%6%36%5%6%9%35%
2531
June1st to 10thDay
6%424445%6%7%11%48%
2340
11th to 20thDay
8%425%6%35%5%5%7%49%
2340
21st to endDay
6%21342445%7%59%
2340
July1st to 10thDay
9%325%5%36%6%6%10%44%
2340
11th to 20thDay
32144346%7%10%57%
2340
21st to endDay
6%4245%45%5%6%10%48%
2546
August1st to 10thDay
6%3245%35%5%7%10%51%
2328
11th to 20thDay
7%425%5%345%7%10%49%
2301
21st to endDay
6%425%43446%9%53%
2459
September1st to 10thDay
12%4244345%5%5%53%
2034
11th to 20thDay
11%5%25%43446%7%48%
1980
21st to endDay
8%42432345%6%59%
1980
October1st to 10thDay
10%42443336%6%55%
1859
11th to 20thDay
10%424232345%61%
1800
21st to endDay
15%6%24323336%52%
1980
November1st to 10thDay
9%5%23324346%60%
1848
11th to 20thDay
10%5%23223336%61%
1710
21st to endDay
14%6%24313346%54%
1710
December1st to 10thDay
13%6%35%5%24436%50%
1710
11th to 20thDay
14%7%36%6%34435%45%
2161
21st to endDay
16%12%6%7%6%445%5%6%31%
3135
January1st to 10thNight
12%8%35%423445%49%
4108
11th to 20thNight
8%5%25%5%34446%53%
4120
21st to endNight
20%9%3432223348%
4532
February1st to 10thNight
14%9%36%5%245%45%45%
2470
11th to 20thNight
13%7%35%434345%51%
2298
21st to endNight
14%6%25%42335%6%52%
1856
March1st to 10thNight
11%5%35%4335%5%6%50%
1986
11th to 20thNight
17%5%24313446%49%
1980
21st to endNight
16%6%35%433446%46%
2178
April1st to 10thNight
11%5%2433345%7%54%
1967
11th to 20thNight
14%5%24434446%50%
1775
21st to endNight
16%5%345%2245%7%48%
1631
May1st to 10thNight
15%6%25%4245%6%7%45%
1620
11th to 20thNight
14%5%2433346%7%50%
1593
21st to endNight
11%4245%35%47%11%45%
1745
June1st to 10thNight
5%4245%335%6%9%54%
1620
11th to 20thNight
5%312425%5%7%11%55%
1620
21st to endNight
5%212323349%64%
1620
July1st to 10thNight
6%4243345%7%10%52%
1620
11th to 20thNight
32234235%48%64%
1620
21st to endNight
5%42343446%10%53%
1772
August1st to 10thNight
4313425%5%7%11%53%
1611
11th to 20thNight
6%4234346%6%9%53%
1600
21st to endNight
421333445%9%62%
1895
September1st to 10thNight
9%424423335%60%
1922
11th to 20thNight
9%5%35%42446%7%50%
1980
21st to endNight
7%314324346%63%
1980
October1st to 10thNight
9%423433346%59%
2081
11th to 20thNight
13%423323335%61%
2160
21st to endNight
14%5%25%323335%56%
2376
November1st to 10thNight
9%313323346%64%
2228
11th to 20thNight
11%5%24323345%60%
2470
21st to endNight
15%5%24322335%56%
2470
December1st to 10thNight
13%6%24433446%52%
2470
11th to 20thNight
11%7%25%424345%51%
3036
21st to endNight
17%8%46%434345%42%
4532

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
40%5%10%25%18%1
2848
11th to 20thDay
34%5%19%25%12%5%
2850
21st to endDay
45%410%21%20%1
3135
February1st to 10thDay
44%412%23%13%4
1710
11th to 20thDay
39%410%26%17%4
1793
21st to endDay
40%47%22%17%9%
1598
March1st to 10thDay
38%410%20%20%8%
1980
11th to 20thDay
43%5%10%21%16%4
1980
21st to endDay
48%8%11%20%12%2
2178
April1st to 10thDay
34%7%12%24%18%5%
1993
11th to 20thDay
40%7%13%21%15%5%
2134
21st to endDay
45%6%9%23%15%2
2326
May1st to 10thDay
45%6%10%21%16%2
2340
11th to 20thDay
40%8%15%22%14%1
2306
21st to endDay
43%10%16%22%9%1
2531
June1st to 10thDay
28%10%18%26%16%2
2340
11th to 20thDay
32%7%14%27%17%3
2340
21st to endDay
22%7%14%30%23%5%
2340
July1st to 10thDay
30%9%18%26%15%2
2276
11th to 20thDay
20%8%15%31%22%3
2271
21st to endDay
28%9%16%29%17%1
2405
August1st to 10thDay
27%10%17%27%17%3
2314
11th to 20thDay
29%9%15%25%21%1
2301
21st to endDay
27%8%12%27%19%7%
2459
September1st to 10thDay
32%7%10%23%21%8%
2034
11th to 20thDay
32%8%13%22%20%4
1980
21st to endDay
27%5%10%23%29%6%
1980
October1st to 10thDay
29%7%12%23%26%5%
1859
11th to 20thDay
26%48%25%30%7%
1800
21st to endDay
35%49%24%20%8%
1980
November1st to 10thDay
28%48%29%25%6%
1848
11th to 20thDay
26%410%27%27%6%
1710
21st to endDay
33%49%24%26%5%
1710
December1st to 10thDay
37%48%31%18%2
1710
11th to 20thDay
40%5%8%22%22%3
2159
21st to endDay
52%7%10%20%10%2
3135
January1st to 10thNight
35%6%10%28%17%3
4108
11th to 20thNight
29%8%16%23%22%3
4120
21st to endNight
42%411%21%20%3
4532
February1st to 10thNight
42%5%11%21%17%5%
2470
11th to 20thNight
36%410%27%19%5%
2298
21st to endNight
35%49%20%23%10%
1856
March1st to 10thNight
34%5%9%20%21%10%
1986
11th to 20thNight
36%6%12%21%20%6%
1980
21st to endNight
40%6%12%24%16%2
2178
April1st to 10thNight
30%6%11%23%22%8%
1967
11th to 20thNight
35%5%12%22%19%7%
1775
21st to endNight
36%6%12%22%21%3
1631
May1st to 10thNight
37%8%13%21%18%3
1620
11th to 20thNight
34%7%13%25%19%2
1594
21st to endNight
33%9%18%26%13%1
1746
June1st to 10thNight
25%8%16%31%17%2
1620
11th to 20thNight
22%7%16%31%21%3
1620
21st to endNight
19%6%14%31%25%6%
1620
July1st to 10thNight
25%8%15%30%19%4
1575
11th to 20thNight
18%6%14%29%29%5%
1566
21st to endNight
25%7%13%33%20%2
1673
August1st to 10thNight
21%8%18%33%18%3
1601
11th to 20thNight
27%9%12%22%25%6%
1600
21st to endNight
19%7%14%29%22%8%
1895
September1st to 10thNight
28%5%9%26%23%10%
1922
11th to 20thNight
33%5%12%19%25%7%
1980
21st to endNight
23%5%9%25%31%7%
1980
October1st to 10thNight
25%5%11%23%26%10%
2081
11th to 20thNight
28%37%22%29%10%
2160
21st to endNight
31%5%8%21%27%8%
2376
November1st to 10thNight
24%5%9%26%29%8%
2228
11th to 20thNight
28%47%26%28%7%
2470
21st to endNight
33%39%21%27%6%
2470
December1st to 10thNight
34%5%11%27%19%4
2470
11th to 20thNight
36%5%8%22%25%4
3037
21st to endNight
42%6%11%22%16%4
4532

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
18%15%31%29%6%
270
11th to 20thDay
21%17%40%18%3
270
21st to endDay
16%15%39%24%5%1
297
February1st to 10thDay
21%16%34%24%4
270
11th to 20thDay
17%17%43%20%4
270
21st to endDay
23%20%39%15%4
225
March1st to 10thDay
19%20%38%18%4
240
11th to 20thDay
25%18%33%22%3
240
21st to endDay
19%22%39%16%4
264
April1st to 10thDay
14%18%43%18%7%
253
11th to 20thDay
20%16%37%23%4
412
21st to endDay
21%18%32%19%9%1
586
May1st to 10thDay
18%13%35%25%9%
603
11th to 20thDay
17%8%32%28%12%3
625
21st to endDay
17%8%29%23%18%6%
679
June1st to 10thDay
6%320%34%30%5%
630
11th to 20thDay
8%324%40%21%3
630
21st to endDay
4326%41%23%4
630
July1st to 10thDay
8%212%33%32%13%
621
11th to 20thDay
3212%39%36%9%
618
21st to endDay
6%29%34%38%12%
684
August1st to 10thDay
7%112%42%32%6%
626
11th to 20thDay
7%114%36%34%7%
615
21st to endDay
6%111%33%40%10%
578
September1st to 10thDay
9%211%27%41%10%
324
11th to 20thDay
6%115%39%27%12%
270
21st to endDay
12%423%34%21%6%
270
October1st to 10thDay
9%7%30%28%18%8%
270
11th to 20thDay
8%11%45%23%11%
270
21st to endDay
24%10%32%25%8%2
297
November1st to 10thDay
14%10%35%28%11%1
270
11th to 20thDay
14%13%37%23%10%3
270
21st to endDay
19%16%33%23%7%1
270
December1st to 10thDay
13%12%43%20%9%3
270
11th to 20thDay
19%15%33%23%9%1
270
21st to endDay
15%22%39%19%4
297
January1st to 10thNight
13%13%37%31%7%
950
11th to 20thNight
15%14%38%27%6%
950
21st to endNight
13%12%39%31%4
1045
February1st to 10thNight
18%13%39%26%4
950
11th to 20thNight
16%16%37%28%3
823
21st to endNight
17%15%38%27%4
600
March1st to 10thNight
13%12%39%31%5%
542
11th to 20thNight
19%11%36%27%7%
540
21st to endNight
19%12%40%25%4
594
April1st to 10thNight
14%13%41%27%4
540
11th to 20thNight
19%11%36%27%7%
533
21st to endNight
17%11%39%25%8%
540
May1st to 10thNight
15%7%39%32%7%1
540
11th to 20thNight
15%9%27%35%14%1
531
21st to endNight
9%5%30%34%20%2
584
June1st to 10thNight
7%120%43%27%1
540
11th to 20thNight
5%227%46%20%1
540
21st to endNight
3229%47%19%1
540
July1st to 10thNight
6%113%45%32%3
525
11th to 20thNight
3112%47%34%4
522
21st to endNight
6%110%44%36%3
591
August1st to 10thNight
4214%48%30%2
537
11th to 20thNight
7%113%48%29%2
534
21st to endNight
3211%40%43%2
594
September1st to 10thNight
10%116%41%29%1
540
11th to 20thNight
12%219%39%23%4
540
21st to endNight
9%321%39%23%4
540
October1st to 10thNight
9%229%33%24%2
641
11th to 20thNight
15%6%38%32%9%1
720
21st to endNight
16%10%32%30%11%1
792
November1st to 10thNight
10%8%38%31%12%1
748
11th to 20thNight
12%12%36%31%9%1
950
21st to endNight
18%11%31%30%9%
950
December1st to 10thNight
15%12%33%32%7%
950
11th to 20thNight
17%11%35%31%6%
950
21st to endNight
17%12%36%29%5%
1045
Page generated at 2024-02-27 05:30:13. Version ac07

Copyright © 2024 Attilla Danko.


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