Panamint Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Panamint Springs clear sky chart from 2005-11-05 to 2017-09-24.

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
74%
15567
38%
46885
31%
15531
81%
15531
64%
19926

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
71%
716
31%
2506
29%
716
80%
716
55%
1035
January16th to endNight
68%
768
36%
2463
31%
768
78%
768
50%
1152
February1st to 15thNight
71%
700
35%
2103
32%
697
79%
697
57%
961
February16th to endNight
62%
632
35%
1895
32%
632
73%
632
56%
878
March1st to 15thNight
66%
720
34%
2160
27%
720
79%
720
60%
955
March16th to endNight
65%
768
40%
2022
26%
768
75%
768
64%
955
April1st to 15thNight
60%
719
36%
1799
17%
719
70%
719
64%
868
April16th to endNight
65%
720
39%
1800
19%
720
72%
720
72%
830
May1st to 15thNight
69%
539
39%
1619
26%
539
76%
539
72%
635
May16th to endNight
68%
561
36%
1684
27%
561
73%
561
70%
676
June1st to 15thNight
77%
397
36%
1477
35%
397
85%
397
68%
501
June16th to endNight
86%
360
40%
1440
45%
360
92%
360
78%
427
July1st to 15thNight
91%
340
35%
1360
43%
340
93%
340
67%
446
July16th to endNight
85%
474
39%
1506
39%
444
86%
444
66%
576
August1st to 15thNight
80%
705
37%
1779
25%
702
81%
702
78%
804
August16th to endNight
88%
764
44%
1910
29%
764
89%
764
82%
852
September1st to 15thNight
86%
720
42%
1842
29%
720
90%
720
77%
834
September16th to endNight
86%
692
48%
1914
42%
692
92%
692
85%
760
October1st to 15thNight
77%
660
42%
1819
36%
660
84%
660
70%
807
October16th to endNight
80%
704
43%
2192
42%
704
87%
704
68%
874
November1st to 15thNight
79%
700
38%
2275
38%
700
88%
700
65%
900
November16th to endNight
77%
720
39%
2340
38%
720
84%
720
63%
947
December1st to 15thNight
72%
720
36%
2340
31%
720
81%
720
53%
1022
December16th to endNight
63%
768
34%
2640
29%
768
74%
768
44%
1231

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
111112235%77%
48036
Night
11112236%77%
47076
TransparencyDay
10%36%16%27%35%
47716
Night
10%37%19%29%30%
46896
SeeingDay
414%35%29%12%3
5784
Night
1317%38%32%5%
15578

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
111111238%73%
1432
16th to endDay
3213313345%67%
1755
February1st to 15thDay
111213249%70%
1751
16th to endDay
321122225%7%67%
1579
March1st to 15thDay
111212249%73%
1800
16th to endDay
1211235%9%71%
2200
April1st to 15thDay
11121235%5%73%
2149
16th to endDay
1112235%79%
2160
May1st to 15thDay
112236%81%
2330
16th to endDay
112112346%75%
2429
June1st to 15thDay
12225%83%
2479
16th to endDay
1122387%
2520
July1st to 15thDay
111213345%75%
2520
16th to endDay
111213346%72%
2556
August1st to 15thDay
111121385%
2169
16th to endDay
111112485%
2292
September1st to 15thDay
111123482%
2118
16th to endDay
1112389%
1904
October1st to 15thDay
111212235%78%
1810
16th to endDay
111112135%80%
1680
November1st to 15thDay
11124481%
1584
16th to endDay
111112236%78%
1620
December1st to 15thDay
1112213347%70%
1620
16th to endDay
2212213347%67%
1579
January1st to 15thNight
12212237%74%
2506
16th to endNight
2312212346%69%
2463
February1st to 15thNight
12213347%70%
2101
16th to endNight
121221325%8%68%
1895
March1st to 15thNight
121335%7%73%
2160
16th to endNight
121225%8%73%
2022
April1st to 15thNight
11112346%75%
1799
16th to endNight
112235%82%
1800
May1st to 15thNight
2235%82%
1619
16th to endNight
111236%79%
1684
June1st to 15thNight
11213483%
1477
16th to endNight
1112289%
1440
July1st to 15thNight
1111224480%
1440
16th to endNight
1112346%75%
1610
August1st to 15thNight
11122384%
1788
16th to endNight
1222484%
1910
September1st to 15thNight
111222382%
1842
16th to endNight
112388%
1914
October1st to 15thNight
111112336%77%
1819
16th to endNight
11111235%80%
2192
November1st to 15thNight
11112235%79%
2275
16th to endNight
111212235%77%
2340
December1st to 15thNight
111213447%70%
2340
16th to endNight
121222335%7%67%
2640

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
11%5%11%29%32%9%
1432
16th to endDay
19%49%26%25%15%
1755
February1st to 15thDay
13%310%26%30%15%
1751
16th to endDay
16%5%9%24%31%12%
1579
March1st to 15thDay
10%39%26%30%20%
1800
16th to endDay
10%411%24%28%19%
2200
April1st to 15thDay
12%47%20%32%21%
2149
16th to endDay
9%26%20%36%25%
2160
May1st to 15thDay
7%25%17%34%32%
2330
16th to endDay
10%35%14%38%27%
2432
June1st to 15thDay
6%2410%25%51%
2479
16th to endDay
5%115%14%72%
2520
July1st to 15thDay
11%25%6%14%60%
2371
16th to endDay
12%35%9%17%50%
2397
August1st to 15thDay
7%126%18%64%
2154
16th to endDay
5%126%23%60%
2292
September1st to 15thDay
8%138%20%57%
2118
16th to endDay
4119%35%48%
1904
October1st to 15thDay
10%3414%33%33%
1810
16th to endDay
9%25%14%35%32%
1680
November1st to 15thDay
8%36%24%36%21%
1584
16th to endDay
8%39%24%33%19%
1620
December1st to 15thDay
13%6%13%25%29%10%
1620
16th to endDay
17%6%12%27%24%11%
1579
January1st to 15thNight
12%5%9%28%32%11%
2506
16th to endNight
17%5%10%22%27%17%
2463
February1st to 15thNight
14%411%26%27%16%
2112
16th to endNight
14%410%24%34%11%
1895
March1st to 15thNight
10%5%8%25%29%20%
2160
16th to endNight
10%48%29%32%14%
2022
April1st to 15thNight
10%39%22%36%18%
1799
16th to endNight
6%36%21%38%23%
1800
May1st to 15thNight
5%35%19%37%28%
1620
16th to endNight
7%25%20%34%28%
1685
June1st to 15thNight
6%2312%27%46%
1477
16th to endNight
4115%16%70%
1440
July1st to 15thNight
8%238%14%62%
1360
16th to endNight
9%35%10%18%52%
1506
August1st to 15thNight
7%227%17%62%
1779
16th to endNight
5%137%23%58%
1910
September1st to 15thNight
7%239%21%55%
1842
16th to endNight
4128%33%50%
1914
October1st to 15thNight
10%2415%34%32%
1819
16th to endNight
8%3414%34%34%
2192
November1st to 15thNight
9%37%21%35%22%
2275
16th to endNight
11%38%20%32%24%
2340
December1st to 15thNight
13%5%12%27%29%11%
2340
16th to endNight
17%7%11%26%25%12%
2640

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
5%20%38%26%10%
60
16th to endDay
8%11%34%28%14%2
205
February1st to 15thDay
418%31%30%12%1
266
16th to endDay
11%23%34%17%10%1
238
March1st to 15thDay
5%22%33%22%13%1
270
16th to endDay
5%25%37%22%7%1
288
April1st to 15thDay
10%27%34%16%10%1
269
16th to endDay
430%40%17%41
270
May1st to 15thDay
319%43%23%7%2
288
16th to endDay
420%29%32%10%2
330
June1st to 15thDay
213%42%26%12%2
315
16th to endDay
11%33%30%17%6%
315
July1st to 15thDay
36%36%33%15%5%
305
16th to endDay
2433%37%15%6%
327
August1st to 15thDay
16%47%25%12%5%
315
16th to endDay
15%33%34%14%9%
332
September1st to 15thDay
17%36%38%12%4
315
16th to endDay
29%33%36%14%3
288
October1st to 15thDay
316%38%27%11%1
255
16th to endDay
314%26%40%12%2
192
November1st to 15thDay
15%16%26%35%14%
90
16th to endDay
3431%46%14%
90
December1st to 15thDay
25%27%43%21%
90
16th to endDay
48%32%33%19%1
71
January1st to 15thNight
1319%40%27%7%
720
16th to endNight
5%319%41%26%4
768
February1st to 15thNight
1320%42%27%4
704
16th to endNight
35%26%38%23%2
632
March1st to 15thNight
5%23%42%23%4
720
16th to endNight
17%23%39%24%3
768
April1st to 15thNight
38%25%37%22%2
719
16th to endNight
6%25%37%25%3
720
May1st to 15thNight
15%23%43%24%2
540
16th to endNight
25%22%37%31%1
563
June1st to 15thNight
316%42%33%3
397
16th to endNight
11%42%40%4
360
July1st to 15thNight
1439%49%4
340
16th to endNight
9%38%48%2
474
August1st to 15thNight
13%40%40%3
705
16th to endNight
8%35%47%7%
764
September1st to 15thNight
9%34%46%7%
720
16th to endNight
110%35%42%8%
692
October1st to 15thNight
1217%37%31%9%
660
16th to endNight
1312%35%38%8%
704
November1st to 15thNight
1314%36%36%9%
700
16th to endNight
2215%37%34%7%
720
December1st to 15thNight
3316%43%28%4
720
16th to endNight
46%23%36%25%4
768
Page generated at 2017-09-25 06:02:27. Version ac04

Copyright 2017 A. Danko


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