Kingman Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kingman Observatory clear sky chart from 2005-11-05 to 2017-10-16.

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
35%
16062
14%
47146
10%
16020
39%
16020
19%
34069

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
13%
900
6%
2506
2%
895
17%
895
9%
2117
January16th to endNight
15%
960
5%
2688
2%
960
17%
960
9%
2296
February1st to 15thNight
18%
725
8%
2171
3%
725
23%
725
10%
1763
February16th to endNight
21%
631
11%
1893
5%
631
27%
631
11%
1512
March1st to 15thNight
26%
720
12%
2155
8%
720
30%
720
16%
1581
March16th to endNight
31%
699
16%
2043
10%
699
38%
699
20%
1457
April1st to 15thNight
31%
539
12%
1797
9%
539
38%
539
18%
1271
April16th to endNight
33%
540
19%
1677
11%
540
41%
540
21%
1143
May1st to 15thNight
39%
540
14%
1620
8%
540
44%
540
21%
1130
May16th to endNight
50%
562
16%
1551
10%
561
54%
561
29%
1014
June1st to 15thNight
54%
540
16%
1440
11%
540
58%
540
35%
897
June16th to endNight
54%
540
13%
1440
9%
540
57%
540
31%
941
July1st to 15thNight
64%
510
17%
1360
14%
510
65%
510
39%
821
July16th to endNight
71%
564
20%
1417
16%
531
73%
531
39%
841
August1st to 15thNight
69%
539
22%
1590
20%
536
71%
536
36%
922
August16th to endNight
65%
573
20%
1878
21%
573
68%
573
31%
1086
September1st to 15thNight
63%
591
24%
1851
23%
591
66%
591
32%
1090
September16th to endNight
57%
717
25%
1980
20%
717
60%
717
33%
1224
October1st to 15thNight
46%
720
21%
2001
16%
720
51%
720
27%
1330
October16th to endNight
23%
708
13%
2300
8%
708
30%
708
14%
1665
November1st to 15thNight
31%
700
18%
2276
14%
700
38%
700
18%
1571
November16th to endNight
21%
720
11%
2340
9%
720
24%
720
10%
1860
December1st to 15thNight
14%
864
5%
2484
2%
864
17%
864
8%
2150
December16th to endNight
11%
960
4%
2688
1%
960
14%
960
6%
2387

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
14%9%46%5%3445%7%34%
48283
Night
15%10%47%5%34446%33%
47314
Cloud CoverDay
14%9%46%5%3445%7%34%
48292
Night
16%10%47%5%34446%33%
47319
TransparencyDay
48%6%12%19%11%1
47969
Night
51%6%11%18%10%1
47146
SeeingDay
17%8%26%25%15%6%
6065
Night
20%9%27%28%12%1
16066

By Month

Percentage Cloud Cover NE (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
16%21%8%11%7%5%323414%
1432
16th to endDay
14%18%11%11%11%4433412%
1536
February1st to 15thDay
13%17%9%13%8%45%33316%
1689
16th to endDay
14%13%8%12%9%35%345%19%
1580
March1st to 15thDay
17%12%6%7%6%24446%26%
1794
16th to endDay
19%8%36%424448%32%
2190
April1st to 15thDay
19%10%45%423336%34%
2151
16th to endDay
16%8%24425%45%6%38%
2283
May1st to 15thDay
18%10%35%43445%6%34%
2331
16th to endDay
12%425%5%25%5%5%8%42%
2561
June1st to 15thDay
10%5%25%5%3445%7%45%
2520
16th to endDay
8%425%5%35%5%7%7%44%
2520
July1st to 15thDay
7%4245%25%5%6%8%47%
2520
16th to endDay
5%324425%5%7%10%46%
2655
August1st to 15thDay
6%425%5%45%6%6%9%45%
2361
16th to endDay
11%5%25%43445%9%43%
2321
September1st to 15thDay
12%424435%45%7%45%
2095
16th to endDay
12%5%25%42446%9%41%
1980
October1st to 15thDay
18%6%25%4235%46%38%
1959
16th to endDay
23%8%25%435%5%5%6%29%
1593
November1st to 15thDay
17%12%35%5%23435%36%
1582
16th to endDay
18%19%5%9%434335%21%
1620
December1st to 15thDay
18%20%10%10%6%2323415%
1474
16th to endDay
22%19%9%11%5%23435%12%
1536
January1st to 15thNight
20%17%7%10%8%34335%17%
2506
16th to endNight
14%16%10%11%9%34235%15%
2688
February1st to 15thNight
15%15%6%11%7%44345%21%
2169
16th to endNight
15%15%7%10%7%35%33423%
1893
March1st to 15thNight
17%10%6%7%423345%32%
2142
16th to endNight
16%8%37%5%245%5%7%33%
2043
April1st to 15thNight
18%8%46%5%35%446%32%
1797
16th to endNight
19%6%35%424445%38%
1677
May1st to 15thNight
18%6%36%5%2446%7%34%
1620
16th to endNight
12%5%25%3245%6%7%43%
1549
June1st to 15thNight
9%5%2442445%9%47%
1440
16th to endNight
9%325%5%45%6%7%9%41%
1440
July1st to 15thNight
5%3145%35%47%8%51%
1440
16th to endNight
6%3133345%6%9%52%
1513
August1st to 15thNight
6%313435%5%6%8%51%
1599
16th to endNight
9%42442445%7%49%
1878
September1st to 15thNight
12%5%13332347%50%
1851
16th to endNight
11%5%25%43345%7%47%
1980
October1st to 15thNight
18%6%24413447%42%
2001
16th to endNight
25%9%36%42343432%
2300
November1st to 15thNight
17%11%36%5%2334436%
2276
16th to endNight
20%18%5%8%6%23235%22%
2340
December1st to 15thNight
21%21%10%9%6%2332315%
2484
16th to endNight
22%20%8%11%6%2433411%
2688

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
16%21%7%11%8%5%333414%
1432
16th to endDay
14%18%11%12%10%4433312%
1536
February1st to 15thDay
13%17%9%12%8%45%33316%
1689
16th to endDay
15%13%8%11%9%34345%19%
1580
March1st to 15thDay
18%12%6%7%6%2445%6%25%
1804
16th to endDay
19%9%36%424447%32%
2189
April1st to 15thDay
19%10%45%423336%34%
2151
16th to endDay
17%8%25%32445%6%38%
2283
May1st to 15thDay
18%9%35%42445%6%34%
2331
16th to endDay
12%5%25%5%3446%8%41%
2561
June1st to 15thDay
11%5%25%5%3445%7%45%
2520
16th to endDay
9%425%4345%7%7%44%
2520
July1st to 15thDay
7%325%5%35%5%5%8%47%
2520
16th to endDay
5%324435%5%7%10%46%
2655
August1st to 15thDay
6%425%5%445%6%9%45%
2361
16th to endDay
11%5%245%2445%9%43%
2321
September1st to 15thDay
12%424335%35%7%45%
2095
16th to endDay
12%5%25%5%25%46%9%42%
1980
October1st to 15thDay
18%7%25%4235%46%38%
1959
16th to endDay
23%8%25%4345%5%6%29%
1593
November1st to 15thDay
17%12%35%423435%36%
1582
16th to endDay
18%19%5%8%5%24335%22%
1620
December1st to 15thDay
18%21%10%11%5%2323416%
1474
16th to endDay
21%19%9%12%5%23425%13%
1536
January1st to 15thNight
20%17%7%9%7%33335%17%
2506
16th to endNight
14%16%11%11%9%3433415%
2688
February1st to 15thNight
15%15%6%11%7%34345%21%
2162
16th to endNight
15%15%7%10%6%35%34423%
1893
March1st to 15thNight
17%11%5%7%423445%32%
2155
16th to endNight
16%8%37%5%245%5%7%33%
2043
April1st to 15thNight
18%8%36%5%35%446%32%
1797
16th to endNight
19%6%35%434445%39%
1677
May1st to 15thNight
18%7%36%5%3445%7%34%
1619
16th to endNight
12%5%25%3245%6%7%44%
1549
June1st to 15thNight
10%5%2442445%9%47%
1440
16th to endNight
9%3245%346%7%9%41%
1440
July1st to 15thNight
5%3145%35%37%8%51%
1440
16th to endNight
6%3133345%7%9%52%
1513
August1st to 15thNight
5%4135%35%5%5%9%51%
1599
16th to endNight
9%41442445%7%50%
1878
September1st to 15thNight
12%5%13333347%51%
1851
16th to endNight
11%424433447%47%
1980
October1st to 15thNight
18%6%24413447%42%
2001
16th to endNight
25%9%36%42343432%
2300
November1st to 15thNight
17%11%35%5%2334437%
2276
16th to endNight
20%17%5%8%5%33335%22%
2340
December1st to 15thNight
21%20%9%9%6%2332415%
2484
16th to endNight
22%20%8%11%6%3333411%
2688

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
74%411%7%2
1433
16th to endDay
76%5%9%5%2
1536
February1st to 15thDay
71%48%9%4
1691
16th to endDay
66%5%11%10%4
1580
March1st to 15thDay
57%5%14%15%6%
1804
16th to endDay
51%6%13%22%5%1
2190
April1st to 15thDay
51%5%10%19%13%
2151
16th to endDay
44%6%13%19%12%4
2283
May1st to 15thDay
50%5%13%21%8%
2331
16th to endDay
39%7%13%24%13%1
2565
June1st to 15thDay
37%6%10%24%19%
2520
16th to endDay
35%8%14%21%17%2
2520
July1st to 15thDay
35%7%11%23%19%2
2371
16th to endDay
29%9%17%24%15%2
2488
August1st to 15thDay
33%8%13%26%16%2
2346
16th to endDay
37%6%13%23%15%2
2321
September1st to 15thDay
36%5%14%22%16%2
2095
16th to endDay
37%6%12%25%15%1
1980
October1st to 15thDay
44%6%10%23%13%1
1959
16th to endDay
52%7%14%17%6%
1593
November1st to 15thDay
48%6%9%20%13%1
1582
16th to endDay
65%5%10%15%2
1620
December1st to 15thDay
73%48%10%2
1474
16th to endDay
74%5%10%7%2
1536
January1st to 15thNight
70%5%9%10%3
2506
16th to endNight
71%5%13%7%1
2688
February1st to 15thNight
65%6%10%12%5%
2171
16th to endNight
64%5%9%16%4
1893
March1st to 15thNight
53%6%12%16%9%1
2155
16th to endNight
49%6%13%21%7%1
2043
April1st to 15thNight
51%6%10%18%13%
1797
16th to endNight
46%5%9%19%14%4
1677
May1st to 15thNight
48%6%13%20%10%1
1620
16th to endNight
37%8%13%23%15%2
1551
June1st to 15thNight
33%5%12%27%17%2
1440
16th to endNight
35%9%17%21%15%1
1440
July1st to 15thNight
28%7%13%25%20%3
1360
16th to endNight
27%8%16%23%19%4
1417
August1st to 15thNight
28%7%12%27%21%1
1590
16th to endNight
32%6%11%24%19%4
1878
September1st to 15thNight
33%5%10%25%20%4
1851
16th to endNight
35%49%26%21%2
1980
October1st to 15thNight
41%5%9%24%16%1
2001
16th to endNight
55%411%19%7%1
2300
November1st to 15thNight
50%5%9%19%13%2
2276
16th to endNight
65%5%10%15%3
2340
December1st to 15thNight
74%47%10%2
2484
16th to endNight
77%5%9%6%1
2688

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
23%20%35%14%6%
90
16th to endDay
28%11%38%16%41
96
February1st to 15thDay
24%27%37%8%1
90
16th to endDay
23%12%39%19%31
81
March1st to 15thDay
36%17%23%21%2
94
16th to endDay
33%9%27%17%9%1
288
April1st to 15thDay
26%12%31%21%6%1
270
16th to endDay
22%9%32%19%10%6%
270
May1st to 15thDay
27%10%27%19%10%4
288
16th to endDay
16%9%29%26%12%4
461
June1st to 15thDay
13%6%30%30%14%4
495
16th to endDay
12%6%35%26%14%5%
495
July1st to 15thDay
10%330%28%18%8%
475
16th to endDay
7%323%34%22%9%
515
August1st to 15thDay
7%116%30%27%15%
334
16th to endDay
16%315%28%25%11%
332
September1st to 15thDay
12%316%28%27%10%
315
16th to endDay
11%7%14%28%27%11%
314
October1st to 15thDay
23%6%23%26%18%2
297
16th to endDay
29%13%33%22%2
99
November1st to 15thDay
14%10%25%31%15%3
90
16th to endDay
34%14%36%11%3
90
December1st to 15thDay
28%27%23%16%3
90
16th to endDay
25%34%37%12
96
January1st to 15thNight
28%15%34%17%4
900
16th to endNight
21%15%35%24%3
960
February1st to 15thNight
24%12%35%22%4
728
16th to endNight
23%14%32%24%5%
631
March1st to 15thNight
23%12%31%23%7%
720
16th to endNight
19%10%32%30%7%
699
April1st to 15thNight
22%11%31%26%7%
539
16th to endNight
22%7%34%25%9%1
540
May1st to 15thNight
21%5%27%32%11%1
540
16th to endNight
15%323%39%16%
563
June1st to 15thNight
13%223%42%16%
540
16th to endNight
10%224%40%20%1
540
July1st to 15thNight
7%118%44%25%2
510
16th to endNight
8%113%41%31%3
564
August1st to 15thNight
6%12%47%27%4
539
16th to endNight
10%213%36%31%4
573
September1st to 15thNight
15%411%36%25%5%
591
16th to endNight
13%5%17%31%27%4
717
October1st to 15thNight
22%6%20%30%17%1
720
16th to endNight
31%12%28%21%5%
708
November1st to 15thNight
21%12%29%25%10%1
700
16th to endNight
30%15%26%20%5%
720
December1st to 15thNight
29%15%34%17%3
864
16th to endNight
30%15%35%16%2
960
Page generated at 2017-10-17 16:35:27. Version ac04

Copyright 2017 A. Danko


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