Trilobite Wilderness
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Trilobite Wilderness clear sky chart from 2005-11-06 to 2024-01-12.

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
75%
24581
40%
74364
33%
24541
82%
24541
64%
32122

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
69%
756
35%
2457
32%
756
77%
756
51%
1122
January11th to 20thNight
71%
724
39%
2353
36%
724
80%
724
54%
1042
January21st to endNight
62%
792
42%
2452
31%
792
77%
792
51%
1152
February1st to 10thNight
68%
720
41%
2160
35%
720
79%
720
60%
967
February11th to 20thNight
67%
700
40%
2099
35%
700
78%
700
58%
958
February21st to endNight
60%
592
40%
1776
36%
592
71%
592
59%
791
March1st to 10thNight
63%
720
33%
2160
28%
720
75%
720
52%
1019
March11th to 20thNight
67%
720
38%
1994
30%
720
76%
720
61%
937
March21st to endNight
62%
792
39%
2178
24%
792
75%
792
63%
1000
April1st to 10thNight
62%
720
39%
1819
20%
720
73%
720
65%
882
April11th to 20thNight
60%
711
41%
1779
19%
711
71%
711
68%
836
April21st to endNight
65%
638
45%
1718
24%
638
77%
638
74%
733
May1st to 10thNight
73%
540
43%
1620
29%
540
81%
540
72%
637
May11th to 20thNight
72%
531
45%
1595
31%
531
79%
531
79%
597
May21st to endNight
72%
582
40%
1746
27%
582
80%
582
76%
662
June1st to 10thNight
83%
540
38%
1620
30%
540
86%
540
79%
610
June11th to 20thNight
83%
540
40%
1620
33%
540
86%
540
84%
592
June21st to endNight
86%
540
37%
1620
32%
540
88%
540
79%
621
July1st to 10thNight
93%
525
36%
1575
32%
525
94%
525
76%
623
July11th to 20thNight
89%
522
34%
1566
29%
522
90%
522
62%
691
July21st to endNight
85%
591
36%
1674
30%
558
86%
558
54%
803
August1st to 10thNight
89%
590
39%
1655
29%
587
90%
587
68%
729
August11th to 20thNight
94%
712
40%
1780
28%
712
94%
712
78%
823
August21st to endNight
92%
792
44%
1980
32%
792
92%
792
76%
923
September1st to 10thNight
88%
720
41%
1885
32%
720
90%
720
72%
864
September11th to 20thNight
93%
720
48%
1980
43%
720
95%
720
85%
791
September21st to endNight
86%
720
47%
1980
39%
720
92%
720
81%
812
October1st to 10thNight
79%
720
44%
1980
36%
720
85%
720
70%
879
October11th to 20thNight
83%
720
51%
1999
43%
720
90%
720
81%
802
October21st to endNight
79%
792
45%
2470
41%
792
88%
792
77%
928
November1st to 10thNight
79%
740
42%
2405
40%
740
88%
740
73%
908
November11th to 20thNight
81%
760
44%
2470
44%
760
88%
760
68%
979
November21st to endNight
70%
760
41%
2470
39%
760
78%
760
60%
1027
December1st to 10thNight
70%
760
38%
2470
35%
760
78%
760
52%
1138
December11th to 20thNight
69%
758
37%
2899
33%
758
77%
758
42%
1342
December21st to endNight
61%
821
24%
4360
32%
817
72%
817
31%
1902

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
2212212346%75%
74873
Night
2212222346%75%
74872
TransparencyDay
12%2412%24%45%
74600
Night
13%2413%25%43%
74667
SeeingDay
35%17%32%31%12%
14266
Night
3315%39%36%5%
24608

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
3313422347%68%
1708
11th to 20thDay
5%213213347%69%
1629
21st to endDay
3213323436%69%
1901
February1st to 10thDay
3213212336%73%
1800
11th to 20thDay
3213313447%69%
1750
21st to endDay
4312323336%70%
1480
March1st to 10thDay
321222235%8%69%
1800
11th to 20thDay
3213313336%72%
1964
21st to endDay
1211323347%75%
2178
April1st to 10thDay
1213323346%71%
2136
11th to 20thDay
1211112245%81%
2129
21st to endDay
1112212236%80%
2240
May1st to 10thDay
1111112335%81%
2340
11th to 20thDay
111111135%84%
2301
21st to endDay
11111223483%
2530
June1st to 10thDay
11111222484%
2340
11th to 20thDay
111122389%
2340
21st to endDay
111221122284%
2340
July1st to 10thDay
2111113346%76%
2340
11th to 20thDay
211232235%6%72%
2340
21st to endDay
2314425%5%6%9%60%
2545
August1st to 10thDay
1212313345%76%
2271
11th to 20thDay
2111213446%75%
2122
21st to endDay
211211335%476%
2376
September1st to 10thDay
2111213345%76%
2073
11th to 20thDay
1111112487%
1980
21st to endDay
111111222385%
1980
October1st to 10thDay
211222233478%
1980
11th to 20thDay
111222485%
1959
21st to endDay
1121223385%
1882
November1st to 10thDay
1112112236%79%
1674
11th to 20thDay
1113323245%77%
1710
21st to endDay
3112212337%73%
1710
December1st to 10thDay
43133245%5%7%64%
1710
11th to 20thDay
442343446%9%57%
2169
21st to endDay
6%4133246%6%7%58%
3146
January1st to 10thNight
321342345%7%65%
2457
11th to 20thNight
3212323447%69%
2353
21st to endNight
4313323335%69%
2452
February1st to 10thNight
3323212346%72%
2160
11th to 20thNight
3213313346%71%
2098
21st to endNight
3312223446%70%
1776
March1st to 10thNight
231332436%7%66%
2160
11th to 20thNight
321232335%8%68%
1994
21st to endNight
111132335%5%73%
2178
April1st to 10thNight
1213213436%74%
1819
11th to 20thNight
121221224478%
1779
21st to endNight
112211236%82%
1718
May1st to 10thNight
1111112336%80%
1620
11th to 20thNight
111111245%84%
1594
21st to endNight
11111225%85%
1746
June1st to 10thNight
11121232484%
1620
11th to 20thNight
111122388%
1620
21st to endNight
111111222385%
1620
July1st to 10thNight
11121332483%
1620
11th to 20thNight
21123235%5%7%68%
1620
21st to endNight
322432446%8%63%
1773
August1st to 10thNight
2112222245%77%
1664
11th to 20thNight
11222346%78%
1780
21st to endNight
2111212345%79%
1980
September1st to 10thNight
1211212245%78%
1885
11th to 20thNight
1121123387%
1980
21st to endNight
111223287%
1980
October1st to 10thNight
2112212335%78%
1980
11th to 20thNight
11111122387%
1999
21st to endNight
11111223484%
2470
November1st to 10thNight
111221223481%
2405
11th to 20thNight
221221223479%
2470
21st to endNight
3212223336%73%
2470
December1st to 10thNight
421342335%6%66%
2470
11th to 20thNight
341443446%10%57%
3041
21st to endNight
442442345%7%59%
4521

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
18%37%20%34%18%
1709
11th to 20thDay
16%36%19%33%23%
1629
21st to endDay
17%27%18%32%24%
1901
February1st to 10thDay
15%25%15%29%34%
1800
11th to 20thDay
15%35%14%26%36%
1760
21st to endDay
17%2417%31%29%
1480
March1st to 10thDay
14%35%16%29%33%
1800
11th to 20thDay
15%26%14%31%33%
1964
21st to endDay
10%2418%36%29%
2178
April1st to 10thDay
15%2415%27%38%
2136
11th to 20thDay
8%1310%29%49%
2132
21st to endDay
8%1211%28%49%
2240
May1st to 10thDay
7%2312%28%48%
2340
11th to 20thDay
7%137%26%56%
2304
21st to endDay
7%139%24%55%
2530
June1st to 10thDay
6%127%19%64%
2340
11th to 20thDay
4115%13%77%
2340
21st to endDay
8%1147%78%
2340
July1st to 10thDay
10%237%14%64%
2276
11th to 20thDay
13%3411%22%47%
2271
21st to endDay
18%48%16%20%34%
2404
August1st to 10thDay
11%339%20%54%
2256
11th to 20thDay
10%339%24%50%
2122
21st to endDay
11%3311%23%50%
2376
September1st to 10thDay
11%35%10%17%55%
2073
11th to 20thDay
5%125%20%67%
1980
21st to endDay
8%227%19%63%
1980
October1st to 10thDay
10%2310%23%52%
1980
11th to 20thDay
6%247%25%57%
1959
21st to endDay
7%2310%23%56%
1882
November1st to 10thDay
9%1314%30%43%
1674
11th to 20thDay
12%15%13%27%42%
1710
21st to endDay
13%25%15%32%33%
1710
December1st to 10thDay
20%47%18%24%27%
1710
11th to 20thDay
23%48%24%26%14%
2168
21st to endDay
24%6%10%23%24%13%
3146
January1st to 10thNight
18%36%17%32%23%
2457
11th to 20thNight
16%45%15%32%29%
2353
21st to endNight
20%26%18%26%27%
2452
February1st to 10thNight
15%25%15%27%36%
2160
11th to 20thNight
16%2413%27%38%
2099
21st to endNight
15%26%15%28%33%
1776
March1st to 10thNight
18%35%16%28%31%
2160
11th to 20thNight
15%25%15%30%33%
1994
21st to endNight
12%25%15%33%32%
2178
April1st to 10thNight
13%25%14%31%36%
1819
11th to 20thNight
10%2311%25%48%
1779
21st to endNight
7%2212%28%50%
1718
May1st to 10thNight
7%2412%27%48%
1620
11th to 20thNight
5%139%29%53%
1595
21st to endNight
6%1210%30%51%
1746
June1st to 10thNight
6%127%20%65%
1620
11th to 20thNight
4116%13%75%
1620
21st to endNight
6%1149%79%
1620
July1st to 10thNight
8%226%14%69%
1575
11th to 20thNight
14%3411%21%47%
1566
21st to endNight
18%46%14%24%33%
1674
August1st to 10thNight
11%347%20%56%
1655
11th to 20thNight
8%2412%23%51%
1780
21st to endNight
9%229%22%56%
1980
September1st to 10thNight
10%248%19%56%
1885
11th to 20thNight
5%126%20%67%
1980
21st to endNight
6%127%17%66%
1980
October1st to 10thNight
11%239%26%49%
1980
11th to 20thNight
6%127%21%63%
1999
21st to endNight
7%148%21%59%
2470
November1st to 10thNight
9%1310%33%44%
2405
11th to 20thNight
11%1310%29%46%
2470
21st to endNight
15%1413%27%40%
2470
December1st to 10thNight
19%25%16%24%32%
2470
11th to 20thNight
22%38%17%32%18%
3041
21st to endNight
23%5%7%25%27%13%
4521

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
9%323%37%23%6%
270
11th to 20thDay
8%320%35%28%7%
243
21st to endDay
38%26%31%27%6%
383
February1st to 10thDay
5%7%20%38%21%8%
420
11th to 20thDay
6%10%27%36%18%3
415
21st to endDay
5%11%31%35%17%1
346
March1st to 10thDay
5%12%27%35%19%2
420
11th to 20thDay
410%23%36%22%5%
420
21st to endDay
313%30%34%16%4
462
April1st to 10thDay
5%8%23%31%25%7%
420
11th to 20thDay
214%29%29%21%5%
412
21st to endDay
213%25%26%23%10%
420
May1st to 10thDay
38%21%34%28%7%
423
11th to 20thDay
27%22%34%25%10%
448
21st to endDay
26%19%36%27%10%
485
June1st to 10thDay
16%15%30%35%13%
450
11th to 20thDay
1315%31%35%16%
450
21st to endDay
1213%34%37%14%
450
July1st to 10thDay
17%27%41%24%
446
11th to 20thDay
2425%43%26%
444
21st to endDay
36%26%42%23%
487
August1st to 10thDay
117%26%43%21%
447
11th to 20thDay
26%29%38%25%
437
21st to endDay
25%24%47%22%
495
September1st to 10thDay
328%30%37%20%
450
11th to 20thDay
118%36%40%14%
450
21st to endDay
2314%28%38%16%
450
October1st to 10thDay
1417%32%35%11%
450
11th to 20thDay
1412%35%38%9%
429
21st to endDay
1315%30%39%13%
297
November1st to 10thDay
1412%37%35%11%
270
11th to 20thDay
2413%33%36%13%
270
21st to endDay
15%17%36%29%12%
270
December1st to 10thDay
5%312%44%30%6%
270
11th to 20thDay
3419%32%33%9%
270
21st to endDay
9%6%21%38%21%6%
297
January1st to 10thNight
4219%43%28%4
760
11th to 20thNight
4317%46%26%4
724
21st to endNight
6%323%43%22%3
792
February1st to 10thNight
4320%45%25%4
720
11th to 20thNight
45%19%46%23%3
704
21st to endNight
5%328%43%19%3
592
March1st to 10thNight
4422%48%20%1
720
11th to 20thNight
4321%40%26%6%
720
21st to endNight
26%26%40%23%2
792
April1st to 10thNight
27%24%41%24%3
720
11th to 20thNight
29%26%36%25%2
711
21st to endNight
17%24%38%26%4
638
May1st to 10thNight
25%19%46%27%2
540
11th to 20thNight
5%21%35%36%3
531
21st to endNight
7%18%41%30%4
584
June1st to 10thNight
1410%46%37%2
540
11th to 20thNight
1113%44%40%1
540
21st to endNight
119%41%45%4
540
July1st to 10thNight
1333%60%4
525
11th to 20thNight
31227%62%6%
522
21st to endNight
41323%64%6%
591
August1st to 10thNight
21327%62%6%
590
11th to 20thNight
1221%67%9%
712
21st to endNight
3220%61%13%
792
September1st to 10thNight
31427%57%8%
720
11th to 20thNight
1439%48%8%
720
21st to endNight
219%34%45%9%
720
October1st to 10thNight
3213%43%36%4
720
11th to 20thNight
1211%41%38%7%
720
21st to endNight
1215%36%37%10%
792
November1st to 10thNight
1114%39%37%7%
740
11th to 20thNight
2111%45%34%7%
760
21st to endNight
4119%41%29%6%
760
December1st to 10thNight
6%216%46%27%3
760
11th to 20thNight
5%316%44%29%4
760
21st to endNight
6%423%44%19%4
836
Page generated at 2024-01-08 19:31:27. Version ac07

Copyright 2024 Attilla Danko


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