Coarsegold
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Coarsegold clear sky chart from 2005-11-06 to 2024-02-15.

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
71%
23803
29%
80177
28%
23715
75%
23715
42%
41211

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
55%
751
16%
4369
19%
736
60%
736
17%
2426
January11th to 20thNight
62%
754
16%
4208
25%
740
67%
740
17%
2625
January21st to endNight
60%
830
17%
4413
25%
814
65%
814
18%
2720
February1st to 10thNight
59%
760
25%
2391
26%
760
62%
760
32%
1392
February11th to 20thNight
64%
718
30%
2152
30%
718
69%
718
39%
1188
February21st to endNight
56%
592
23%
1776
22%
592
60%
592
32%
1087
March1st to 10thNight
56%
720
19%
2160
19%
720
59%
720
30%
1335
March11th to 20thNight
60%
720
22%
2012
20%
720
63%
720
36%
1219
March21st to endNight
61%
792
21%
2032
15%
792
65%
792
41%
1227
April1st to 10thNight
61%
720
27%
1800
14%
720
67%
720
45%
1051
April11th to 20thNight
62%
711
30%
1779
14%
711
67%
711
49%
1010
April21st to endNight
68%
720
29%
1800
14%
720
73%
720
56%
969
May1st to 10thNight
69%
669
30%
1749
18%
669
73%
669
57%
892
May11th to 20thNight
71%
505
37%
1568
30%
505
74%
505
59%
687
May21st to endNight
74%
388
31%
1552
30%
388
81%
388
51%
611
June1st to 10thNight
80%
360
33%
1440
39%
360
83%
360
54%
542
June11th to 20thNight
83%
360
41%
1440
46%
360
90%
360
73%
445
June21st to endNight
87%
360
41%
1440
50%
360
92%
360
76%
438
July1st to 10thNight
92%
350
40%
1400
50%
350
95%
350
81%
403
July11th to 20thNight
89%
348
41%
1392
51%
348
90%
348
66%
462
July21st to endNight
87%
539
40%
1625
36%
509
88%
509
65%
669
August1st to 10thNight
87%
634
39%
1699
27%
631
88%
631
77%
738
August11th to 20thNight
91%
712
39%
1780
24%
712
92%
712
82%
795
August21st to endNight
93%
792
45%
1980
29%
792
93%
792
84%
875
September1st to 10thNight
91%
720
47%
1800
34%
720
93%
720
85%
786
September11th to 20thNight
87%
720
46%
1840
37%
720
89%
720
78%
826
September21st to endNight
86%
720
44%
1980
41%
720
89%
720
76%
846
October1st to 10thNight
80%
720
35%
2092
36%
720
84%
720
61%
961
October11th to 20thNight
82%
720
40%
2160
42%
720
86%
720
64%
942
October21st to endNight
80%
792
44%
2384
44%
792
86%
792
67%
1006
November1st to 10thNight
75%
740
32%
2405
36%
740
78%
740
47%
1162
November11th to 20thNight
73%
760
33%
2470
32%
760
79%
760
49%
1159
November21st to endNight
70%
760
32%
2470
32%
760
74%
760
42%
1269
December1st to 10thNight
62%
760
24%
2597
24%
760
65%
760
32%
1453
December11th to 20thNight
58%
760
20%
3219
24%
759
62%
759
20%
2075
December21st to endNight
52%
826
14%
4803
21%
817
58%
817
15%
2920

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
8%313323345%64%
78459
Night
10%413323346%62%
80646
TransparencyDay
23%5%9%18%24%21%
78172
Night
24%5%10%20%23%18%
80455
SeeingDay
8%7%24%35%19%5%
14219
Night
9%212%37%33%7%
23839

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 10thDay
15%8%25%5%345%6%8%40%
2539
11th to 20thDay
17%5%37%7%46%5%5%6%36%
2737
21st to endDay
20%6%25%5%345%7%9%35%
3146
February1st to 10thDay
17%5%13323446%50%
1786
11th to 20thDay
14%5%2442346%6%50%
1791
21st to endDay
18%7%24424445%46%
1480
March1st to 10thDay
16%9%35%5%35%448%38%
1800
11th to 20thDay
16%6%25%4335%5%8%43%
1944
21st to endDay
14%5%243245%5%7%49%
2322
April1st to 10thDay
12%423423346%56%
2160
11th to 20thDay
11%424422346%58%
2129
21st to endDay
8%324323447%61%
2160
May1st to 10thDay
4323323246%68%
2209
11th to 20thDay
5%213323346%69%
2323
21st to endDay
6%213313446%65%
2723
June1st to 10thDay
3213223446%71%
2520
11th to 20thDay
11121122485%
2520
21st to endDay
21111212385%
2520
July1st to 10thDay
111111212486%
2520
11th to 20thDay
21111222284%
2520
21st to endDay
111222333479%
2593
August1st to 10thDay
22111122384%
2229
11th to 20thDay
11111122387%
2122
21st to endDay
11111122387%
2376
September1st to 10thDay
21111122287%
2160
11th to 20thDay
221111223482%
2118
21st to endDay
221111223382%
1980
October1st to 10thDay
431221333472%
1864
11th to 20thDay
3112323345%75%
1800
21st to endDay
6%212222245%73%
1972
November1st to 10thDay
9%31343335%7%59%
1674
11th to 20thDay
8%31332245%6%63%
1710
21st to endDay
11%413324336%59%
1710
December1st to 10thDay
14%3235%235%46%54%
1580
11th to 20thDay
24%8%35%5%33336%38%
1928
21st to endDay
13%6%45%6%35%5%6%8%38%
2794
January1st to 10thNight
15%8%35%423346%46%
4406
11th to 20thNight
20%7%35%42446%7%38%
4225
21st to endNight
21%6%2442445%8%39%
4521
February1st to 10thNight
17%6%23312446%52%
2391
11th to 20thNight
13%31332345%7%56%
2151
21st to endNight
17%7%24423345%51%
1776
March1st to 10thNight
18%5%24333445%48%
2160
11th to 20thNight
16%5%24423348%50%
2012
21st to endNight
14%413322346%57%
2032
April1st to 10thNight
12%41322235%6%60%
1800
11th to 20thNight
8%313323345%64%
1779
21st to endNight
7%312223345%68%
1800
May1st to 10thNight
4213322347%69%
1749
11th to 20thNight
5%113212246%73%
1567
21st to endNight
5%213212335%75%
1552
June1st to 10thNight
4212212336%74%
1440
11th to 20thNight
1111122487%
1440
21st to endNight
11111122388%
1440
July1st to 10thNight
111122389%
1440
11th to 20thNight
321221213481%
1440
21st to endNight
221221333477%
1721
August1st to 10thNight
221111112384%
1708
11th to 20thNight
11121222386%
1780
21st to endNight
2111122288%
1980
September1st to 10thNight
1111121290%
1800
11th to 20thNight
221111222384%
1840
21st to endNight
311111223383%
1980
October1st to 10thNight
4212212235%74%
2092
11th to 20thNight
411211234476%
2160
21st to endNight
5%12212235%79%
2384
November1st to 10thNight
9%312212247%65%
2405
11th to 20thNight
7%31332235%6%66%
2470
21st to endNight
9%323224346%61%
2470
December1st to 10thNight
14%5%24323346%54%
2597
11th to 20thNight
24%6%25%42335%6%39%
3276
21st to endNight
15%6%36%6%35%5%7%7%37%
4862

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
37%10%22%20%9%2
2539
11th to 20thDay
46%10%12%15%10%8%
2737
21st to endDay
42%11%16%17%11%4
3146
February1st to 10thDay
35%6%9%24%18%7%
1786
11th to 20thDay
33%5%10%25%20%7%
1801
21st to endDay
40%7%11%23%18%1
1480
March1st to 10thDay
43%7%11%19%16%4
1800
11th to 20thDay
37%8%12%20%18%5%
1944
21st to endDay
33%8%17%24%14%4
2322
April1st to 10thDay
31%5%13%26%19%7%
2160
11th to 20thDay
28%5%11%26%22%8%
2132
21st to endDay
24%6%11%29%26%5%
2160
May1st to 10thDay
19%5%11%24%33%9%
2209
11th to 20thDay
18%49%26%31%12%
2326
21st to endDay
19%5%9%31%28%7%
2724
June1st to 10thDay
14%5%10%20%32%19%
2520
11th to 20thDay
7%35%17%38%31%
2520
21st to endDay
8%239%32%47%
2520
July1st to 10thDay
5%127%24%60%
2451
11th to 20thDay
8%248%26%53%
2445
21st to endDay
9%3411%24%48%
2449
August1st to 10thDay
8%239%25%53%
2213
11th to 20thDay
6%138%33%49%
2122
21st to endDay
6%128%36%47%
2376
September1st to 10thDay
7%228%29%53%
2160
11th to 20thDay
8%2420%36%29%
2118
21st to endDay
9%2318%38%30%
1980
October1st to 10thDay
16%46%17%27%30%
1864
11th to 20thDay
14%36%22%27%28%
1800
21st to endDay
15%37%21%30%23%
1972
November1st to 10thDay
25%6%11%19%24%16%
1674
11th to 20thDay
22%413%26%26%10%
1710
21st to endDay
29%310%19%26%14%
1710
December1st to 10thDay
32%6%12%21%19%11%
1580
11th to 20thDay
50%6%9%16%13%7%
1928
21st to endDay
40%11%17%20%8%3
2794
January1st to 10thNight
35%11%19%22%12%2
4406
11th to 20thNight
44%7%18%14%10%7%
4225
21st to endNight
41%8%13%21%13%4
4521
February1st to 10thNight
34%5%10%23%19%9%
2391
11th to 20thNight
27%6%10%27%22%7%
2152
21st to endNight
37%412%26%17%4
1776
March1st to 10thNight
37%6%14%19%20%4
2160
11th to 20thNight
33%5%14%22%20%5%
2012
21st to endNight
29%6%16%27%17%5%
2032
April1st to 10thNight
26%5%15%26%19%8%
1800
11th to 20thNight
23%5%12%29%23%9%
1779
21st to endNight
19%414%31%28%5%
1800
May1st to 10thNight
16%5%10%27%32%10%
1749
11th to 20thNight
15%37%30%33%13%
1568
21st to endNight
15%411%30%31%10%
1552
June1st to 10thNight
15%311%22%32%18%
1440
11th to 20thNight
5%3420%36%32%
1440
21st to endNight
5%239%31%50%
1440
July1st to 10thNight
4215%27%61%
1400
11th to 20thNight
9%228%22%56%
1392
21st to endNight
11%349%24%50%
1625
August1st to 10thNight
9%1212%24%52%
1699
11th to 20thNight
6%148%32%49%
1780
21st to endNight
6%127%32%52%
1980
September1st to 10thNight
5%228%27%58%
1800
11th to 20thNight
8%2414%42%30%
1840
21st to endNight
9%1415%40%31%
1980
October1st to 10thNight
14%36%17%27%32%
2092
11th to 20thNight
12%37%20%29%28%
2160
21st to endNight
11%25%24%31%26%
2384
November1st to 10thNight
22%411%22%24%18%
2405
11th to 20thNight
20%412%26%25%14%
2470
21st to endNight
25%49%22%29%12%
2470
December1st to 10thNight
33%5%11%21%18%13%
2597
11th to 20thNight
45%5%12%16%16%6%
3276
21st to endNight
40%11%15%20%9%4
4862

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
27%7%26%26%12%4
180
11th to 20thDay
18%6%22%31%17%6%
299
21st to endDay
18%7%21%32%16%5%
407
February1st to 10thDay
20%8%26%26%15%6%
406
11th to 20thDay
16%9%30%28%15%3
432
21st to endDay
16%13%29%30%12%1
346
March1st to 10thDay
17%13%28%30%9%2
420
11th to 20thDay
19%13%29%22%14%3
420
21st to endDay
19%15%30%26%10%1
462
April1st to 10thDay
14%16%30%25%13%1
420
11th to 20thDay
15%17%28%29%9%2
412
21st to endDay
7%13%29%30%16%4
420
May1st to 10thDay
7%15%35%29%11%4
423
11th to 20thDay
8%11%31%31%14%5%
448
21st to endDay
8%11%23%37%15%6%
485
June1st to 10thDay
39%28%33%20%7%
450
11th to 20thDay
28%28%38%17%7%
450
21st to endDay
16%24%40%21%8%
450
July1st to 10thDay
1118%47%25%8%
446
11th to 20thDay
211%46%28%13%
444
21st to endDay
1116%45%28%10%
487
August1st to 10thDay
3221%46%19%9%
447
11th to 20thDay
2318%46%21%10%
437
21st to endDay
1116%47%26%9%
495
September1st to 10thDay
2418%44%26%6%
450
11th to 20thDay
3427%41%22%3
450
21st to endDay
27%19%44%25%2
450
October1st to 10thDay
37%26%35%26%3
450
11th to 20thDay
36%23%39%25%4
450
21st to endDay
6%5%21%37%28%4
487
November1st to 10thDay
9%6%23%29%28%6%
270
11th to 20thDay
6%423%36%25%7%
270
21st to endDay
11%6%21%31%26%5%
270
December1st to 10thDay
14%227%30%22%5%
208
11th to 20thDay
15%5%24%35%14%7%
180
21st to endDay
19%8%25%26%15%7%
198
January1st to 10thNight
19%216%33%21%9%
760
11th to 20thNight
11%417%39%23%7%
760
21st to endNight
18%214%37%22%7%
836
February1st to 10thNight
19%313%38%19%7%
760
11th to 20thNight
14%316%34%26%7%
722
21st to endNight
20%315%40%19%4
592
March1st to 10thNight
18%415%38%20%4
720
11th to 20thNight
14%5%13%31%30%6%
720
21st to endNight
15%217%39%24%2
792
April1st to 10thNight
12%418%38%26%2
720
11th to 20thNight
8%422%37%24%5%
711
21st to endNight
7%218%39%27%7%
720
May1st to 10thNight
5%417%41%27%5%
669
11th to 20thNight
6%216%42%32%2
505
21st to endNight
6%215%37%36%4
389
June1st to 10thNight
4210%42%38%3
360
11th to 20thNight
113%43%40%4
360
21st to endNight
110%36%49%4
360
July1st to 10thNight
5%38%54%3
350
11th to 20thNight
3237%49%8%
348
21st to endNight
16%25%55%13%
539
August1st to 10thNight
217%35%47%8%
634
11th to 20thNight
1436%51%8%
712
21st to endNight
2329%58%9%
792
September1st to 10thNight
115%31%53%10%
720
11th to 20thNight
217%38%42%10%
720
21st to endNight
317%34%47%9%
720
October1st to 10thNight
5%19%43%36%7%
720
11th to 20thNight
5%18%38%37%10%
720
21st to endNight
5%111%34%33%16%
792
November1st to 10thNight
9%39%34%33%12%
740
11th to 20thNight
7%213%40%31%8%
760
21st to endNight
10%113%39%28%9%
760
December1st to 10thNight
15%213%39%24%6%
760
11th to 20thNight
20%212%39%22%5%
760
21st to endNight
20%218%36%19%4
836
Page generated at 2024-02-12 03:35:36. Version ac07

Copyright 2024 Attilla Danko


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