Bartlesville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bartlesville clear sky chart from 2005-11-05 to 2018-01-12.

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
45%
16299
23%
48343
15%
16253
53%
16253
35%
27639

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 15thNight
35%
955
25%
2472
11%
951
44%
951
37%
1459
January16th to endNight
34%
960
26%
2496
9%
960
44%
960
39%
1466
February1st to 15thNight
29%
873
21%
2281
7%
869
38%
869
31%
1450
February16th to endNight
32%
614
23%
1876
9%
614
44%
614
32%
1069
March1st to 15thNight
34%
540
21%
1980
14%
540
44%
540
25%
1130
March16th to endNight
31%
576
17%
2112
13%
576
38%
576
23%
1252
April1st to 15thNight
31%
539
21%
1908
12%
539
45%
539
29%
1051
April16th to endNight
34%
540
16%
1686
10%
540
43%
540
29%
1027
May1st to 15thNight
39%
539
20%
1620
14%
539
49%
539
28%
1003
May16th to endNight
50%
563
17%
1684
14%
561
57%
561
31%
1030
June1st to 15thNight
64%
540
18%
1620
14%
540
68%
540
40%
888
June16th to endNight
65%
540
19%
1620
15%
540
69%
540
48%
822
July1st to 15thNight
70%
510
17%
1530
17%
510
72%
510
41%
853
July16th to endNight
81%
564
24%
1594
27%
531
82%
531
48%
809
August1st to 15thNight
77%
539
25%
1610
28%
536
79%
536
44%
855
August16th to endNight
77%
573
25%
1796
29%
573
78%
573
41%
948
September1st to 15thNight
63%
540
23%
1941
25%
540
67%
540
31%
1066
September16th to endNight
62%
537
28%
1980
27%
537
67%
537
36%
992
October1st to 15thNight
47%
668
27%
2108
20%
668
52%
668
35%
1189
October16th to endNight
45%
768
31%
2304
16%
768
56%
768
47%
1157
November1st to 15thNight
41%
831
28%
2351
13%
831
52%
831
41%
1294
November16th to endNight
36%
975
26%
2535
11%
975
46%
975
38%
1515
December1st to 15thNight
36%
975
22%
2535
10%
975
44%
975
34%
1580
December16th to endNight
33%
1040
22%
2704
9%
1040
42%
1040
31%
1734

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
9%4143217%346%42%
48995
Night
8%4133217%335%47%
48539
Cloud CoverDay
11%5%24424447%48%
48993
Night
10%423323346%54%
48539
TransparencyDay
35%5%12%24%18%3
48693
Night
30%5%11%25%21%5%
48344
SeeingDay
11%6%25%30%21%4
6153
Night
12%7%30%33%14%1
16301

By Month

Percentage Cloud Cover SW (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 15thDay
8%5%133118%22346%
1710
16th to endDay
9%5%143218%23444%
1728
February1st to 15thDay
9%6%25%3218%225%39%
1591
16th to endDay
9%6%143218%23442%
1598
March1st to 15thDay
11%6%243219%325%38%
1980
16th to endDay
15%6%243219%32336%
2112
April1st to 15thDay
10%6%143120%346%37%
2040
16th to endDay
14%6%26%4119%335%31%
2271
May1st to 15thDay
12%5%143220%235%37%
2331
16th to endDay
8%425%5%321%446%33%
2430
June1st to 15thDay
5%3144220%5%5%7%39%
2340
16th to endDay
2123220%5%5%7%47%
2340
July1st to 15thDay
5%3134220%5%47%40%
2340
16th to endDay
32134321%448%42%
2466
August1st to 15thDay
6%3134212%45%8%47%
2340
16th to endDay
5%315%4212%45%9%46%
2405
September1st to 15thDay
12%4144112%45%5%43%
2016
16th to endDay
8%4233211%35%6%47%
1980
October1st to 15thDay
11%5%133210%235%49%
1839
16th to endDay
6%3133211%235%56%
1920
November1st to 15thDay
8%3122116%235%51%
1836
16th to endDay
11%412217%135%49%
1755
December1st to 15thDay
14%4143218%23438%
1755
16th to endDay
10%6%25%4317%33438%
1872
January1st to 15thNight
8%4123118%235%48%
2472
16th to endNight
7%4133118%23449%
2496
February1st to 15thNight
9%6%243118%33342%
2271
16th to endNight
8%4133218%235%46%
1876
March1st to 15thNight
10%415%3218%34441%
1980
16th to endNight
12%4232119%335%41%
2112
April1st to 15thNight
10%3122119%235%45%
1908
16th to endNight
11%5%134218%43439%
1686
May1st to 15thNight
11%3132218%345%43%
1619
16th to endNight
9%3123220%35%8%39%
1683
June1st to 15thNight
33123219%347%47%
1620
16th to endNight
1112220%348%53%
1620
July1st to 15thNight
43133220%45%8%44%
1620
16th to endNight
22123220%248%48%
1702
August1st to 15thNight
3223212%46%9%50%
1620
16th to endNight
42123212%45%8%53%
1796
September1st to 15thNight
8%4233211%335%50%
1941
16th to endNight
7%3143211%346%51%
1980
October1st to 15thNight
12%4133211%235%49%
2108
16th to endNight
6%2122110%33460%
2304
November1st to 15thNight
7%3133115%23453%
2351
16th to endNight
11%4132117%22449%
2535
December1st to 15thNight
12%5%133218%335%41%
2535
16th to endNight
10%6%243118%235%41%
2704

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 15thDay
11%6%24423235%54%
1710
16th to endDay
11%6%24422246%51%
1728
February1st to 15thDay
12%7%45%433326%46%
1591
16th to endDay
10%8%25%323346%48%
1598
March1st to 15thDay
14%7%35%324335%45%
1980
16th to endDay
20%8%35%323335%40%
2110
April1st to 15thDay
12%6%2442445%6%44%
2040
16th to endDay
17%7%26%5%2445%5%39%
2271
May1st to 15thDay
18%6%35%434346%40%
2331
16th to endDay
12%5%36%5%35%5%5%7%39%
2430
June1st to 15thDay
8%4245%35%5%5%8%46%
2340
16th to endDay
6%213425%5%5%8%52%
2340
July1st to 15thDay
8%3245%35%6%6%10%44%
2340
16th to endDay
4314435%5%6%9%50%
2466
August1st to 15thDay
6%3134345%6%10%49%
2340
16th to endDay
6%325%42446%10%48%
2405
September1st to 15thDay
13%42442446%6%47%
2016
16th to endDay
9%42432336%7%53%
1980
October1st to 15thDay
12%5%24322345%54%
1839
16th to endDay
8%413322326%60%
1920
November1st to 15thDay
9%5%12214237%57%
1836
16th to endDay
14%412212236%57%
1755
December1st to 15thDay
15%5%24423335%48%
1755
16th to endDay
13%7%25%433436%43%
1872
January1st to 15thNight
10%5%22313345%56%
2472
16th to endNight
8%5%2432233458%
2496
February1st to 15thNight
12%7%3432333450%
2271
16th to endNight
10%424323346%54%
1876
March1st to 15thNight
11%5%25%422446%49%
1980
16th to endNight
16%5%23323446%47%
2112
April1st to 15thNight
12%423323346%53%
1908
16th to endNight
14%5%24422445%48%
1686
May1st to 15thNight
14%42332345%6%48%
1619
16th to endNight
11%31343446%9%46%
1683
June1st to 15thNight
5%42342345%9%55%
1620
16th to endNight
411232435%10%59%
1620
July1st to 15thNight
6%3233345%6%10%50%
1620
16th to endNight
321242435%10%58%
1702
August1st to 15thNight
4313425%5%6%10%53%
1620
16th to endNight
5%2123345%5%9%55%
1796
September1st to 15thNight
10%5%24423345%54%
1941
16th to endNight
7%314324346%57%
1980
October1st to 15thNight
13%423323345%54%
2108
16th to endNight
7%212212435%65%
2304
November1st to 15thNight
8%313323346%60%
2351
16th to endNight
13%423212335%57%
2535
December1st to 15thNight
14%5%13323345%51%
2535
16th to endNight
14%7%34323236%48%
2704

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 15thDay
33%311%30%20%1
1711
16th to endDay
34%312%27%18%2
1728
February1st to 15thDay
41%313%25%12%3
1592
16th to endDay
36%48%29%15%4
1598
March1st to 15thDay
41%410%21%17%5%
1980
16th to endDay
47%6%10%20%14%1
2112
April1st to 15thDay
37%6%14%22%15%3
2040
16th to endDay
45%5%9%20%15%2
2271
May1st to 15thDay
46%410%20%16%1
2331
16th to endDay
40%9%15%20%12%
2434
June1st to 15thDay
33%7%14%23%18%1
2340
16th to endDay
27%6%14%25%21%3
2340
July1st to 15thDay
32%7%16%27%14%1
2201
16th to endDay
26%8%15%30%17%1
2311
August1st to 15thDay
26%9%16%22%20%3
2326
16th to endDay
29%8%13%27%16%5%
2405
September1st to 15thDay
35%7%11%20%17%7%
2016
16th to endDay
29%5%11%25%22%4
1980
October1st to 15thDay
32%5%10%22%23%5%
1839
16th to endDay
26%39%26%25%7%
1920
November1st to 15thDay
28%49%29%23%5%
1836
16th to endDay
29%310%24%27%4
1755
December1st to 15thDay
38%310%29%17%1
1755
16th to endDay
41%412%22%14%4
1872
January1st to 15thNight
29%49%29%22%3
2472
16th to endNight
29%411%27%22%5%
2496
February1st to 15thNight
37%310%26%16%4
2281
16th to endNight
31%411%26%20%5%
1876
March1st to 15thNight
35%6%11%20%20%6%
1980
16th to endNight
38%6%12%23%17%2
2112
April1st to 15thNight
32%5%11%22%23%6%
1908
16th to endNight
36%411%21%19%5%
1686
May1st to 15thNight
36%6%11%20%20%3
1620
16th to endNight
33%8%16%24%16%1
1685
June1st to 15thNight
25%6%13%31%19%2
1620
16th to endNight
19%6%14%30%24%4
1620
July1st to 15thNight
25%7%14%30%20%2
1530
16th to endNight
21%412%32%25%3
1594
August1st to 15thNight
23%6%16%28%19%6%
1610
16th to endNight
23%7%13%26%21%7%
1796
September1st to 15thNight
33%49%23%18%10%
1941
16th to endNight
26%49%26%26%5%
1980
October1st to 15thNight
32%410%20%22%10%
2108
16th to endNight
21%38%26%31%8%
2304
November1st to 15thNight
26%310%24%26%8%
2351
16th to endNight
30%38%23%27%5%
2535
December1st to 15thNight
33%5%11%27%19%2
2535
16th to endNight
38%312%22%17%5%
2704

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 15thDay
20%11%29%33%5%
123
16th to endDay
11%17%43%19%6%1
96
February1st to 15thDay
7%17%45%23%5%
90
16th to endDay
6%19%43%27%3
81
March1st to 15thDay
20%24%43%10%2
90
16th to endDay
16%11%38%28%5%
96
April1st to 15thDay
15%12%36%28%5%
159
16th to endDay
20%13%35%19%9%1
381
May1st to 15thDay
16%10%34%25%10%2
468
16th to endDay
18%6%34%25%12%3
517
June1st to 15thDay
8%225%33%25%3
495
16th to endDay
6%320%41%24%4
495
July1st to 15thDay
8%214%38%29%6%
475
16th to endDay
47%30%45%11%
515
August1st to 15thDay
7%9%37%37%8%
493
16th to endDay
7%13%34%38%5%
445
September1st to 15thDay
4111%30%40%11%
171
16th to endDay
11%22%31%25%8%
135
October1st to 15thDay
7%8%31%30%15%6%
135
16th to endDay
6%9%37%32%10%4
144
November1st to 15thDay
20%429%22%20%2
135
16th to endDay
25%17%28%23%4
135
December1st to 15thDay
12%8%48%20%7%2
135
16th to endDay
18%19%37%18%5%
144
January1st to 15thNight
13%13%36%30%7%
956
16th to endNight
10%11%40%31%5%
960
February1st to 15thNight
15%12%39%28%4
873
16th to endNight
12%13%38%29%5%
614
March1st to 15thNight
13%11%39%29%6%
540
16th to endNight
18%10%37%27%6%
576
April1st to 15thNight
14%10%41%27%5%
539
16th to endNight
17%8%38%25%10%
540
May1st to 15thNight
15%7%36%29%9%1
540
16th to endNight
11%429%34%17%1
563
June1st to 15thNight
7%123%42%24%
540
16th to endNight
3127%43%23%
540
July1st to 15thNight
7%116%48%25%1
510
16th to endNight
5%6%40%43%3
564
August1st to 15thNight
411%43%36%3
539
16th to endNight
4110%42%38%2
573
September1st to 15thNight
12%117%39%27%2
540
16th to endNight
11%219%35%26%5%
537
October1st to 15thNight
15%330%28%19%2
668
16th to endNight
9%7%36%32%13%1
768
November1st to 15thNight
10%9%35%30%12%1
831
16th to endNight
15%12%33%29%9%
975
December1st to 15thNight
16%11%32%31%7%
975
16th to endNight
18%10%34%30%6%
1040
Page generated at 2018-01-12 21:01:29. Version ac04

Copyright 2018 A. Danko


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