Redrock Inyokern Road
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Redrock Inyokern Road clear sky chart from 2005-11-05 to 2017-09-21.

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
67%
15665
39%
46863
30%
15624
77%
15624
65%
19741

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
65%
718
30%
2506
27%
716
75%
716
51%
1067
January16th to endNight
58%
768
38%
2415
30%
768
71%
768
49%
1141
February1st to 15thNight
59%
697
36%
2104
28%
696
72%
696
54%
974
February16th to endNight
56%
632
37%
1895
30%
632
71%
632
52%
908
March1st to 15thNight
59%
720
34%
2160
26%
720
73%
720
58%
945
March16th to endNight
53%
768
38%
2010
21%
768
67%
768
64%
931
April1st to 15thNight
50%
719
37%
1799
14%
719
63%
719
61%
873
April16th to endNight
54%
720
41%
1800
16%
720
66%
720
71%
814
May1st to 15thNight
53%
579
40%
1659
23%
579
62%
579
75%
644
May16th to endNight
52%
561
38%
1685
22%
561
64%
561
70%
641
June1st to 15thNight
64%
405
39%
1485
33%
405
77%
405
81%
449
June16th to endNight
78%
360
42%
1440
45%
360
87%
360
86%
398
July1st to 15thNight
90%
340
36%
1360
43%
340
93%
340
69%
443
July16th to endNight
84%
525
39%
1553
34%
491
85%
491
67%
631
August1st to 15thNight
80%
717
38%
1790
24%
713
81%
713
84%
781
August16th to endNight
87%
764
47%
1910
30%
764
89%
764
86%
829
September1st to 15thNight
86%
720
44%
1830
31%
720
90%
720
80%
810
September16th to endNight
82%
680
49%
1881
40%
680
90%
680
86%
738
October1st to 15thNight
73%
660
42%
1834
33%
660
83%
660
68%
803
October16th to endNight
75%
704
46%
2161
41%
704
86%
704
71%
855
November1st to 15thNight
73%
700
39%
2275
36%
700
84%
700
67%
886
November16th to endNight
73%
720
40%
2340
40%
720
80%
720
63%
946
December1st to 15thNight
66%
720
37%
2340
29%
720
78%
720
52%
1036
December16th to endNight
60%
768
34%
2631
30%
768
71%
768
46%
1198

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%76%
47988
Night
111112236%76%
47057
TransparencyDay
11%15%16%27%37%
47673
Night
11%16%19%30%31%
46872
SeeingDay
5%13%28%29%18%4
5853
Night
25%21%37%28%5%
15677

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
412112346%70%
1432
16th to endDay
7%32223345%64%
1803
February1st to 15thDay
221223348%67%
1751
16th to endDay
421231335%7%63%
1579
March1st to 15thDay
111121345%8%67%
1800
16th to endDay
2121336%10%67%
2211
April1st to 15thDay
211112336%73%
2149
16th to endDay
1112236%79%
2160
May1st to 15thDay
1111122483%
2289
16th to endDay
111112125%79%
2429
June1st to 15thDay
11135%83%
2471
16th to endDay
111289%
2520
July1st to 15thDay
11122225%78%
2520
16th to endDay
1111112236%74%
2503
August1st to 15thDay
1111122284%
2160
16th to endDay
11122385%
2292
September1st to 15thDay
11222482%
2130
16th to endDay
111388%
1871
October1st to 15thDay
211111235%78%
1793
16th to endDay
11111223478%
1711
November1st to 15thDay
11111345%78%
1584
16th to endDay
211112346%73%
1620
December1st to 15thDay
211122245%8%66%
1620
16th to endDay
4213223448%64%
1590
January1st to 15thNight
221221335%7%67%
2506
16th to endNight
4313212336%66%
2415
February1st to 15thNight
1112323337%67%
2101
16th to endNight
5%112212346%67%
1895
March1st to 15thNight
111221235%8%69%
2160
16th to endNight
11111235%8%71%
2010
April1st to 15thNight
121112236%76%
1799
16th to endNight
111235%81%
1800
May1st to 15thNight
11136%82%
1659
16th to endNight
11125%85%
1684
June1st to 15thNight
122487%
1485
16th to endNight
11490%
1440
July1st to 15thNight
1112113381%
1440
16th to endNight
11111223378%
1661
August1st to 15thNight
1112386%
1800
16th to endNight
11387%
1910
September1st to 15thNight
111122383%
1830
16th to endNight
112388%
1881
October1st to 15thNight
1122235%78%
1834
16th to endNight
111122481%
2161
November1st to 15thNight
111111236%77%
2275
16th to endNight
211112248%73%
2340
December1st to 15thNight
2212223348%67%
2340
16th to endNight
4212213349%64%
2631

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
16%310%27%28%14%
1432
16th to endDay
22%27%25%24%17%
1803
February1st to 15thDay
16%37%23%30%18%
1751
16th to endDay
20%29%24%30%11%
1579
March1st to 15thDay
13%29%25%27%21%
1800
16th to endDay
11%211%26%29%19%
2211
April1st to 15thDay
12%17%23%34%20%
2149
16th to endDay
7%17%21%36%25%
2160
May1st to 15thDay
7%1319%32%35%
2289
16th to endDay
9%1315%40%29%
2432
June1st to 15thDay
5%311%27%51%
2471
16th to endDay
5%1413%74%
2520
July1st to 15thDay
9%116%14%65%
2371
16th to endDay
12%139%22%50%
2348
August1st to 15thDay
7%116%18%66%
2146
16th to endDay
5%115%23%63%
2292
September1st to 15thDay
7%127%22%58%
2130
16th to endDay
5%16%33%52%
1871
October1st to 15thDay
10%1213%35%34%
1793
16th to endDay
10%1314%30%39%
1711
November1st to 15thDay
9%17%19%37%24%
1584
16th to endDay
13%27%21%30%24%
1620
December1st to 15thDay
15%312%23%30%13%
1620
16th to endDay
19%6%11%27%23%11%
1590
January1st to 15thNight
16%29%24%31%15%
2506
16th to endNight
20%28%21%26%20%
2415
February1st to 15thNight
17%28%22%27%21%
2112
16th to endNight
18%26%26%33%12%
1895
March1st to 15thNight
13%210%24%29%20%
2160
16th to endNight
11%211%31%29%14%
2010
April1st to 15thNight
12%16%29%34%15%
1799
16th to endNight
7%16%27%41%16%
1800
May1st to 15thNight
41423%39%26%
1660
16th to endNight
5%15%21%42%24%
1685
June1st to 15thNight
3315%31%44%
1485
16th to endNight
226%18%69%
1440
July1st to 15thNight
8%116%15%66%
1360
16th to endNight
11%138%25%48%
1553
August1st to 15thNight
5%27%21%61%
1790
16th to endNight
5%15%31%56%
1910
September1st to 15thNight
7%28%26%53%
1830
16th to endNight
3118%37%48%
1881
October1st to 15thNight
10%1313%36%33%
1834
16th to endNight
8%1313%32%40%
2161
November1st to 15thNight
9%15%19%36%26%
2275
16th to endNight
11%27%23%27%28%
2340
December1st to 15thNight
16%310%23%30%15%
2340
16th to endNight
19%411%26%25%12%
2631

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
10%18%31%28%5%6%
60
16th to endDay
15%12%24%25%18%3
253
February1st to 15thDay
6%16%29%24%18%3
266
16th to endDay
13%17%29%27%8%3
238
March1st to 15thDay
5%22%29%21%17%3
270
16th to endDay
5%25%30%25%12%1
288
April1st to 15thDay
13%25%28%19%9%4
269
16th to endDay
7%26%34%23%6%2
270
May1st to 15thDay
218%39%21%14%3
288
16th to endDay
5%20%26%26%16%4
330
June1st to 15thDay
5%12%37%25%16%3
315
16th to endDay
111%31%30%19%5%
315
July1st to 15thDay
2327%35%22%7%
305
16th to endDay
2126%38%22%8%
327
August1st to 15thDay
3431%35%17%7%
315
16th to endDay
324%37%23%10%
332
September1st to 15thDay
2425%38%23%4
315
16th to endDay
28%18%37%28%5%
276
October1st to 15thDay
5%12%30%29%19%2
255
16th to endDay
213%24%30%26%3
223
November1st to 15thDay
17%8%23%43%15%
90
16th to endDay
212%21%38%25%
90
December1st to 15thDay
111%21%44%22%
90
16th to endDay
8%13%21%34%19%2
73
January1st to 15thNight
4421%35%26%8%
720
16th to endNight
7%423%34%23%5%
768
February1st to 15thNight
15%26%35%23%6%
704
16th to endNight
5%7%27%36%18%4
632
March1st to 15thNight
19%25%38%20%4
720
16th to endNight
210%31%33%19%3
768
April1st to 15thNight
312%31%31%17%3
719
16th to endNight
112%30%35%17%2
720
May1st to 15thNight
18%35%35%16%2
580
16th to endNight
112%31%31%21%
563
June1st to 15thNight
5%27%45%19%1
405
16th to endNight
118%53%25%
360
July1st to 15thNight
2446%45%1
340
16th to endNight
18%41%45%2
525
August1st to 15thNight
15%41%39%2
717
16th to endNight
8%37%43%8%
764
September1st to 15thNight
9%37%44%7%
720
16th to endNight
213%31%41%9%
680
October1st to 15thNight
1417%39%28%7%
660
16th to endNight
2315%31%36%10%
704
November1st to 15thNight
1416%34%32%10%
700
16th to endNight
2416%37%30%8%
720
December1st to 15thNight
45%18%40%25%5%
720
16th to endNight
6%5%23%37%22%4
768
Page generated at 2017-09-22 04:35:30. Version ac04

Copyright 2017 A. Danko


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