Kingman Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kingman Observatory clear sky chart from 2005-11-06 to 2024-03-18.

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
33%
24831
13%
81046
10%
24725
38%
24725
16%
59957

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
14%
942
5%
4423
3%
926
20%
926
5%
3786
January11th to 20thNight
13%
948
3%
4440
2%
930
15%
930
4%
4022
January21st to endNight
13%
1041
3%
4879
1%
1023
15%
1023
4%
4247
February1st to 10thNight
17%
798
9%
2373
4%
798
21%
798
10%
1926
February11th to 20thNight
20%
740
11%
2219
5%
740
25%
740
12%
1745
February21st to endNight
16%
628
11%
1884
3%
628
23%
628
11%
1484
March1st to 10thNight
24%
760
12%
2280
7%
760
27%
760
15%
1695
March11th to 20thNight
30%
752
19%
2156
10%
752
38%
752
23%
1464
March21st to endNight
29%
689
15%
2075
10%
689
36%
689
18%
1510
April1st to 10thNight
29%
540
13%
1800
9%
540
36%
540
18%
1244
April11th to 20thNight
32%
533
18%
1771
13%
533
39%
533
19%
1196
April21st to endNight
30%
540
15%
1620
8%
540
37%
540
20%
1139
May1st to 10thNight
35%
540
13%
1620
8%
540
39%
540
20%
1133
May11th to 20thNight
43%
531
16%
1590
10%
531
49%
531
24%
1066
May21st to endNight
51%
583
16%
1552
10%
582
55%
582
30%
1034
June1st to 10thNight
55%
540
17%
1440
12%
540
60%
540
37%
874
June11th to 20thNight
51%
540
17%
1440
12%
540
55%
540
33%
924
June21st to endNight
54%
540
15%
1440
10%
540
58%
540
32%
943
July1st to 10thNight
64%
525
17%
1400
14%
525
66%
525
38%
843
July11th to 20thNight
64%
522
22%
1392
17%
522
67%
522
39%
830
July21st to endNight
67%
591
20%
1487
16%
558
68%
558
36%
906
August1st to 10thNight
68%
537
21%
1569
19%
534
70%
534
35%
925
August11th to 20thNight
64%
534
21%
1638
19%
534
68%
534
32%
967
August21st to endNight
64%
594
23%
1980
23%
594
67%
594
32%
1112
September1st to 10thNight
57%
540
20%
1800
20%
540
60%
540
28%
1086
September11th to 20thNight
63%
706
30%
1966
25%
706
66%
706
37%
1164
September21st to endNight
48%
720
22%
1980
15%
720
52%
720
29%
1279
October1st to 10thNight
47%
720
22%
1980
16%
720
51%
720
28%
1309
October11th to 20thNight
28%
720
15%
2187
8%
720
37%
720
17%
1536
October21st to endNight
22%
792
14%
2574
9%
792
30%
792
13%
1908
November1st to 10thNight
29%
740
18%
2406
13%
740
36%
740
18%
1651
November11th to 20thNight
20%
760
13%
2470
8%
760
28%
760
12%
1878
November21st to endNight
22%
760
12%
2470
9%
760
27%
760
11%
1923
December1st to 10thNight
14%
893
5%
2603
3%
893
16%
893
8%
2199
December11th to 20thNight
14%
950
6%
3278
3%
949
18%
949
7%
2797
December21st to endNight
10%
1042
3%
4864
1%
1026
14%
1026
4%
4212

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%11%5%7%6%3445%7%33%
78581
Night
16%12%6%8%6%3445%6%30%
81259
TransparencyDay
50%7%12%19%11%1
78282
Night
55%7%11%17%10%1
81079
SeeingDay
19%12%28%24%13%4
14797
Night
21%11%28%28%12%1
24852

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%24%10%11%8%43345%14%
2527
11th to 20thDay
14%18%10%15%10%6%10%3238%
2530
21st to endDay
25%23%9%11%6%3333412%
2783
February1st to 10thDay
14%16%7%12%10%5%5%44418%
1804
11th to 20thDay
15%13%7%13%10%44345%21%
1848
21st to endDay
17%13%8%11%6%35%45%5%23%
1570
March1st to 10thDay
16%13%7%8%7%3445%6%27%
1900
11th to 20thDay
14%10%5%7%5%345%5%8%34%
1968
21st to endDay
20%12%48%5%345%46%27%
2295
April1st to 10thDay
17%12%5%6%5%3445%7%32%
2160
11th to 20thDay
16%10%35%4345%46%38%
2138
21st to endDay
19%9%37%5%3446%7%34%
2340
May1st to 10thDay
17%10%36%5%445%5%8%33%
2340
11th to 20thDay
19%9%35%5%2445%6%38%
2301
21st to endDay
12%5%26%6%35%5%6%9%42%
2725
June1st to 10thDay
10%5%25%5%35%45%8%47%
2520
11th to 20thDay
10%5%25%5%345%6%7%47%
2520
21st to endDay
11%5%25%4345%6%8%45%
2520
July1st to 10thDay
8%425%5%35%6%5%8%50%
2520
11th to 20thDay
9%5%244345%7%10%47%
2520
21st to endDay
7%425%5%45%5%7%9%49%
2743
August1st to 10thDay
7%425%445%5%7%10%46%
2359
11th to 20thDay
9%5%25%6%45%5%6%8%45%
2260
21st to endDay
9%5%245%345%6%9%49%
2376
September1st to 10thDay
10%6%26%5%45%46%8%45%
2155
11th to 20thDay
13%425%435%5%6%8%45%
1980
21st to endDay
13%7%35%5%25%46%9%41%
1980
October1st to 10thDay
16%7%36%5%345%47%42%
1980
11th to 20thDay
23%9%26%5%25%5%5%7%31%
1770
21st to endDay
25%12%47%5%35%5%46%24%
1782
November1st to 10thDay
15%12%37%5%245%5%6%37%
1672
11th to 20thDay
17%19%6%9%6%34445%24%
1710
21st to endDay
20%18%7%8%5%34435%23%
1710
December1st to 10thDay
16%20%11%11%5%33345%19%
1574
11th to 20thDay
15%21%10%12%5%34445%16%
1918
21st to endDay
21%24%8%13%7%24335%10%
2783
January1st to 10thNight
17%22%11%12%8%3444411%
4428
11th to 20thNight
15%20%11%15%8%5%8%32310%
4440
21st to endNight
25%19%11%10%7%3433410%
4884
February1st to 10thNight
17%14%6%10%10%45%445%21%
2373
11th to 20thNight
14%15%6%13%8%45%445%23%
2218
21st to endNight
18%15%7%11%6%3434425%
1884
March1st to 10thNight
17%11%7%8%6%3445%5%31%
2280
11th to 20thNight
13%9%47%5%3445%7%39%
2156
21st to endNight
20%11%5%7%5%245%5%7%31%
2075
April1st to 10thNight
15%10%46%5%36%45%7%34%
1800
11th to 20thNight
19%10%35%435%446%37%
1771
21st to endNight
20%6%46%6%345%5%6%36%
1620
May1st to 10thNight
16%9%37%6%4446%8%33%
1620
11th to 20thNight
18%7%36%6%2435%7%40%
1589
21st to endNight
11%5%36%4346%7%9%42%
1551
June1st to 10thNight
10%5%25%4245%6%10%49%
1440
11th to 20thNight
9%6%345%35%5%6%9%45%
1440
21st to endNight
10%326%6%446%7%10%42%
1440
July1st to 10thNight
6%425%5%35%37%8%52%
1440
11th to 20thNight
8%31443447%9%52%
1440
21st to endNight
6%4245%45%6%6%9%50%
1575
August1st to 10thNight
8%424435%6%7%10%48%
1578
11th to 20thNight
8%3245%446%6%9%49%
1638
21st to endNight
8%4245%35%5%5%7%52%
1980
September1st to 10thNight
10%7%35%5%4445%8%47%
1800
11th to 20thNight
11%5%2442346%8%53%
1966
21st to endNight
13%6%36%5%445%5%8%43%
1980
October1st to 10thNight
16%7%35%42345%7%44%
1980
11th to 20thNight
21%10%46%5%24446%34%
2187
21st to endNight
26%10%36%6%33445%30%
2574
November1st to 10thNight
15%11%5%6%6%24445%38%
2406
11th to 20thNight
16%18%6%9%6%34346%25%
2470
21st to endNight
20%18%6%7%5%34346%25%
2470
December1st to 10thNight
18%21%10%11%6%24335%16%
2603
11th to 20thNight
15%19%9%14%8%45%44416%
3279
21st to endNight
25%23%7%10%6%3444411%
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
72%7%10%8%2
2528
11th to 20thDay
80%8%7%41
2530
21st to endDay
78%5%7%8%2
2783
February1st to 10thDay
68%7%9%11%5%1
1804
11th to 20thDay
63%5%11%13%7%
1858
21st to endDay
62%6%12%13%6%1
1570
March1st to 10thDay
57%6%11%18%7%
1900
11th to 20thDay
48%6%15%20%9%2
1968
21st to endDay
58%6%11%19%5%1
2295
April1st to 10thDay
51%6%11%20%11%
2160
11th to 20thDay
46%7%10%21%14%3
2138
21st to endDay
48%7%12%18%13%3
2340
May1st to 10thDay
48%7%13%21%9%1
2340
11th to 20thDay
47%6%11%22%13%1
2305
21st to endDay
39%8%13%24%14%2
2725
June1st to 10thDay
36%7%11%25%19%1
2520
11th to 20thDay
34%7%13%24%19%3
2520
21st to endDay
36%9%14%22%16%3
2520
July1st to 10thDay
33%7%12%26%19%4
2451
11th to 20thDay
31%8%15%27%17%3
2445
21st to endDay
30%9%15%27%16%3
2591
August1st to 10thDay
32%9%14%28%15%2
2344
11th to 20thDay
34%9%15%26%15%1
2260
21st to endDay
31%7%13%26%18%4
2376
September1st to 10thDay
36%8%16%22%16%3
2155
11th to 20thDay
35%7%13%29%15%1
1980
21st to endDay
38%7%13%24%17%1
1980
October1st to 10thDay
43%6%10%23%16%2
1980
11th to 20thDay
50%8%12%20%10%
1770
21st to endDay
60%6%11%15%7%1
1782
November1st to 10thDay
47%8%11%20%14%1
1672
11th to 20thDay
61%7%9%16%6%1
1710
21st to endDay
65%5%11%15%5%
1710
December1st to 10thDay
69%411%11%4
1574
11th to 20thDay
69%7%12%10%2
1915
21st to endDay
79%5%7%7%2
2783
January1st to 10thNight
73%8%9%8%2
4428
11th to 20thNight
80%6%8%42
4440
21st to endNight
78%5%10%6%1
4884
February1st to 10thNight
66%6%10%12%6%1
2373
11th to 20thNight
62%6%10%15%7%
2219
21st to endNight
63%5%9%14%6%2
1884
March1st to 10thNight
54%7%11%19%8%
2280
11th to 20thNight
44%6%14%21%13%2
2156
21st to endNight
54%5%10%20%9%1
2075
April1st to 10thNight
48%7%13%19%12%1
1800
11th to 20thNight
48%6%8%20%15%3
1771
21st to endNight
48%7%11%18%14%2
1620
May1st to 10thNight
49%6%13%21%10%1
1620
11th to 20thNight
44%6%12%19%17%1
1590
21st to endNight
37%10%14%24%14%2
1552
June1st to 10thNight
31%6%13%29%18%3
1440
11th to 20thNight
35%7%14%23%19%2
1440
21st to endNight
35%9%18%22%14%2
1440
July1st to 10thNight
29%8%14%26%19%4
1400
11th to 20thNight
27%9%14%26%21%4
1392
21st to endNight
29%9%16%23%18%5%
1487
August1st to 10thNight
29%9%13%29%19%2
1569
11th to 20thNight
30%10%14%26%18%2
1638
21st to endNight
31%7%11%25%21%5%
1980
September1st to 10thNight
36%7%12%23%17%5%
1800
11th to 20thNight
31%6%8%31%23%2
1966
21st to endNight
39%6%11%25%17%2
1980
October1st to 10thNight
40%7%9%25%18%1
1980
11th to 20thNight
51%5%10%20%12%1
2187
21st to endNight
57%6%10%19%7%1
2574
November1st to 10thNight
49%6%9%20%14%1
2406
11th to 20thNight
60%5%11%15%7%1
2470
21st to endNight
62%6%11%16%5%
2470
December1st to 10thNight
71%5%9%10%4
2603
11th to 20thNight
71%7%10%9%2
3281
21st to endNight
76%7%10%6%1
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
22%19%33%20%5%1
270
11th to 20thDay
24%17%37%16%41
270
21st to endDay
27%16%33%21%3
297
February1st to 10thDay
28%19%31%17%41
270
11th to 20thDay
26%25%30%16%3
270
21st to endDay
24%27%37%10%2
225
March1st to 10thDay
24%21%38%13%31
270
11th to 20thDay
25%16%34%18%5%1
359
21st to endDay
31%17%26%18%6%1
462
April1st to 10thDay
26%15%33%20%5%1
420
11th to 20thDay
24%20%28%18%8%2
412
21st to endDay
27%11%32%19%8%3
420
May1st to 10thDay
28%14%28%20%8%2
423
11th to 20thDay
22%11%29%23%11%4
447
21st to endDay
14%8%32%24%16%6%
679
June1st to 10thDay
11%7%32%30%15%4
630
11th to 20thDay
12%8%30%30%17%4
630
21st to endDay
14%7%31%29%16%4
630
July1st to 10thDay
9%5%23%29%25%11%
621
11th to 20thDay
11%6%28%30%19%6%
618
21st to endDay
8%425%36%20%6%
684
August1st to 10thDay
10%317%32%26%13%
478
11th to 20thDay
10%5%21%27%28%8%
439
21st to endDay
11%5%22%30%24%9%
495
September1st to 10thDay
14%7%19%31%20%8%
450
11th to 20thDay
11%6%17%30%24%13%
450
21st to endDay
17%11%19%25%18%9%
450
October1st to 10thDay
20%10%24%25%17%3
450
11th to 20thDay
28%15%29%23%5%
334
21st to endDay
35%14%31%15%4
297
November1st to 10thDay
19%18%31%23%7%2
270
11th to 20thDay
26%23%29%17%6%
270
21st to endDay
33%15%37%13%2
270
December1st to 10thDay
25%26%29%13%6%1
270
11th to 20thDay
20%27%34%13%41
270
21st to endDay
25%28%32%13%2
297
January1st to 10thNight
25%16%33%20%5%
950
11th to 20thNight
27%15%33%21%4
950
21st to endNight
22%16%33%25%4
1045
February1st to 10thNight
26%12%37%22%3
798
11th to 20thNight
22%17%34%24%4
743
21st to endNight
27%15%37%18%3
628
March1st to 10thNight
21%16%31%25%7%1
760
11th to 20thNight
19%12%36%26%7%
752
21st to endNight
25%10%30%29%7%1
689
April1st to 10thNight
20%12%34%27%6%1
540
11th to 20thNight
25%9%32%26%7%1
533
21st to endNight
23%9%32%27%9%1
540
May1st to 10thNight
21%7%30%32%9%1
540
11th to 20thNight
20%5%25%35%15%1
531
21st to endNight
13%324%39%19%1
584
June1st to 10thNight
12%422%43%18%1
540
11th to 20thNight
13%426%40%16%1
540
21st to endNight
10%324%39%22%1
540
July1st to 10thNight
7%316%40%30%4
525
11th to 20thNight
9%317%39%27%4
522
21st to endNight
8%214%44%29%2
591
August1st to 10thNight
8%212%47%28%4
537
11th to 20thNight
10%214%39%31%4
534
21st to endNight
10%315%38%30%4
594
September1st to 10thNight
13%415%39%24%5%
540
11th to 20thNight
13%6%15%35%28%4
706
21st to endNight
15%7%22%30%21%4
720
October1st to 10thNight
20%6%22%31%20%1
720
11th to 20thNight
26%14%26%25%7%1
720
21st to endNight
33%12%28%22%5%
792
November1st to 10thNight
22%13%32%23%10%1
740
11th to 20thNight
25%19%30%21%41
760
21st to endNight
28%14%30%23%4
760
December1st to 10thNight
27%17%34%18%4
893
11th to 20thNight
24%17%36%20%3
950
21st to endNight
31%16%34%17%2
1045
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