McCloud Nature Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the McCloud Nature Park clear sky chart from 2005-11-06 to 2024-01-27.

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
39%
24445
19%
74787
12%
24388
46%
24388
23%
49926

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
22%
950
15%
2648
6%
946
30%
946
16%
1972
January11th to 20thNight
17%
950
13%
2660
5%
950
24%
950
15%
2072
January21st to endNight
19%
996
13%
2806
5%
996
25%
996
15%
2123
February1st to 10thNight
20%
720
12%
2160
5%
720
27%
720
15%
1619
February11th to 20thNight
22%
700
15%
2099
7%
700
30%
700
17%
1484
February21st to endNight
18%
592
16%
1776
5%
592
28%
592
16%
1293
March1st to 10thNight
25%
720
16%
2160
9%
720
30%
720
19%
1481
March11th to 20thNight
26%
720
17%
2073
8%
720
34%
720
22%
1409
March21st to endNight
26%
676
16%
2062
7%
676
37%
676
19%
1468
April1st to 10thNight
31%
540
19%
1800
10%
540
43%
540
22%
1145
April11th to 20thNight
37%
533
21%
1775
17%
533
45%
533
23%
1131
April21st to endNight
28%
540
18%
1674
6%
540
40%
540
22%
1113
May1st to 10thNight
32%
540
14%
1620
8%
540
39%
540
20%
1155
May11th to 20thNight
45%
531
17%
1593
12%
531
49%
531
24%
1077
May21st to endNight
56%
582
19%
1643
13%
582
60%
582
30%
1049
June1st to 10thNight
56%
540
19%
1440
14%
540
59%
540
36%
871
June11th to 20thNight
57%
540
21%
1440
15%
540
62%
540
37%
881
June21st to endNight
61%
540
20%
1440
16%
540
64%
540
36%
891
July1st to 10thNight
71%
525
18%
1400
16%
525
72%
525
36%
873
July11th to 20thNight
71%
522
23%
1392
17%
522
73%
522
46%
786
July21st to endNight
70%
591
26%
1521
21%
558
73%
558
43%
878
August1st to 10thNight
72%
537
23%
1600
22%
534
73%
534
36%
924
August11th to 20thNight
71%
534
23%
1730
24%
534
74%
534
34%
984
August21st to endNight
68%
594
25%
1980
25%
594
72%
594
39%
1045
September1st to 10thNight
63%
540
23%
1800
22%
540
67%
540
30%
1035
September11th to 20thNight
66%
706
33%
1966
27%
706
70%
706
41%
1110
September21st to endNight
57%
720
27%
1980
20%
720
61%
720
36%
1198
October1st to 10thNight
55%
720
27%
1980
20%
720
60%
720
36%
1180
October11th to 20thNight
38%
720
25%
2127
15%
720
48%
720
28%
1320
October21st to endNight
31%
792
20%
2574
14%
792
40%
792
22%
1668
November1st to 10thNight
36%
740
26%
2406
19%
740
48%
740
30%
1380
November11th to 20thNight
31%
760
24%
2470
14%
760
45%
760
23%
1555
November21st to endNight
30%
760
19%
2470
12%
760
39%
760
17%
1734
December1st to 10thNight
21%
783
14%
2493
6%
783
30%
783
16%
1794
December11th to 20thNight
25%
949
16%
3184
7%
948
32%
948
16%
2256
December21st to endNight
17%
1042
7%
4845
4%
1026
24%
1026
7%
3972

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%8%46%5%35%5%5%7%37%
74961
Night
14%9%46%5%3445%7%39%
75106
TransparencyDay
46%5%12%22%13%2
74666
Night
46%411%22%15%3
74923
SeeingDay
16%10%26%25%16%7%
14481
Night
18%9%28%30%14%1
24454

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
17%12%7%10%7%45%45%5%25%
1517
11th to 20thDay
17%13%6%12%7%445%46%22%
1520
21st to endDay
15%17%5%10%7%4445%6%23%
1691
February1st to 10thDay
17%13%6%10%7%5%5%44426%
1800
11th to 20thDay
16%10%5%9%8%45%5%5%6%28%
1748
21st to endDay
18%13%6%8%6%23446%30%
1480
March1st to 10thDay
17%11%47%6%44347%32%
1800
11th to 20thDay
17%10%47%7%35%447%33%
1886
21st to endDay
21%12%5%7%6%34447%27%
2308
April1st to 10thDay
15%10%46%5%3445%8%37%
2160
11th to 20thDay
17%9%25%5%4445%6%37%
2134
21st to endDay
21%7%36%6%4445%6%34%
2286
May1st to 10thDay
18%9%36%6%35%5%5%6%33%
2340
11th to 20thDay
19%8%35%5%35%45%8%34%
2301
21st to endDay
10%6%26%6%47%7%6%9%36%
2629
June1st to 10thDay
11%5%245%45%5%7%8%43%
2520
11th to 20thDay
8%5%25%435%7%6%9%45%
2520
21st to endDay
10%5%46%5%35%5%6%11%41%
2520
July1st to 10thDay
9%6%35%5%36%5%7%9%42%
2520
11th to 20thDay
8%4345%35%5%8%11%45%
2520
21st to endDay
8%425%5%46%6%7%9%45%
2707
August1st to 10thDay
8%5%24435%6%7%9%46%
2327
11th to 20thDay
10%5%26%5%46%5%6%11%40%
2168
21st to endDay
7%425%5%345%6%10%48%
2376
September1st to 10thDay
12%5%26%5%35%45%8%44%
2155
11th to 20thDay
10%5%235%346%6%7%48%
1980
21st to endDay
12%5%2443445%6%51%
1980
October1st to 10thDay
13%5%245%345%47%48%
1980
11th to 20thDay
15%6%35%5%35%46%7%41%
1828
21st to endDay
18%9%36%6%445%46%35%
1782
November1st to 10thDay
10%6%345%3445%5%51%
1672
11th to 20thDay
16%10%46%6%3445%6%38%
1710
21st to endDay
18%10%48%6%2345%6%34%
1710
December1st to 10thDay
19%13%5%8%6%34445%29%
1685
11th to 20thDay
16%14%8%10%5%34346%27%
1918
21st to endDay
22%19%9%11%6%3434416%
2783
January1st to 10thNight
17%11%49%7%35%5%45%29%
2648
11th to 20thNight
16%15%6%10%7%35%44426%
2660
21st to endNight
17%12%8%9%7%44445%27%
2806
February1st to 10thNight
20%11%5%9%6%44445%28%
2160
11th to 20thNight
15%11%6%8%7%35%45%6%31%
2098
21st to endNight
19%12%5%8%5%345%5%5%30%
1776
March1st to 10thNight
17%10%47%5%34446%35%
2160
11th to 20thNight
17%8%46%5%35%45%7%37%
2073
21st to endNight
21%10%46%5%25%35%6%33%
2062
April1st to 10thNight
14%7%45%5%45%5%5%7%40%
1800
11th to 20thNight
16%8%35%5%3445%7%40%
1775
21st to endNight
18%7%36%5%3446%6%37%
1674
May1st to 10thNight
16%9%47%5%36%5%5%8%32%
1620
11th to 20thNight
16%6%35%5%346%6%7%39%
1592
21st to endNight
9%5%36%5%45%5%7%10%41%
1642
June1st to 10thNight
9%6%35%42445%8%50%
1440
11th to 20thNight
9%425%5%3446%8%49%
1440
21st to endNight
7%5%25%5%35%6%7%10%45%
1440
July1st to 10thNight
9%4145%346%7%11%47%
1440
11th to 20thNight
7%4133345%7%10%53%
1440
21st to endNight
6%425%43445%9%54%
1610
August1st to 10thNight
7%424435%5%7%8%51%
1611
11th to 20thNight
6%425%6%36%5%6%9%49%
1730
21st to endNight
8%32442445%8%56%
1980
September1st to 10thNight
12%5%35%4345%5%8%48%
1800
11th to 20thNight
7%4244345%5%8%54%
1966
21st to endNight
11%5%3442446%6%51%
1980
October1st to 10thNight
8%425%5%3445%7%53%
1980
11th to 20thNight
17%6%24424346%46%
2127
21st to endNight
18%8%35%5%34447%39%
2574
November1st to 10thNight
11%6%3442445%6%50%
2406
11th to 20thNight
14%8%36%5%345%5%6%41%
2470
21st to endNight
20%11%5%6%435%345%34%
2470
December1st to 10thNight
17%10%6%8%7%435%5%5%30%
2493
11th to 20thNight
17%12%5%9%5%34446%32%
3279
21st to endNight
23%18%7%9%7%3444418%
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
61%38%17%10%1
1518
11th to 20thDay
64%411%14%7%
1520
21st to endDay
61%312%18%5%1
1691
February1st to 10thDay
62%39%17%8%1
1800
11th to 20thDay
56%411%20%8%1
1758
21st to endDay
56%39%21%9%2
1480
March1st to 10thDay
53%410%22%11%1
1800
11th to 20thDay
52%314%19%10%1
1886
21st to endDay
59%310%21%5%1
2308
April1st to 10thDay
47%5%12%21%14%1
2160
11th to 20thDay
48%411%23%11%3
2134
21st to endDay
51%312%20%11%3
2286
May1st to 10thDay
51%5%13%22%9%
2340
11th to 20thDay
48%6%12%19%14%1
2305
21st to endDay
41%8%13%21%14%2
2629
June1st to 10thDay
37%5%13%26%15%3
2520
11th to 20thDay
34%6%12%25%20%3
2520
21st to endDay
37%6%17%21%16%4
2520
July1st to 10thDay
38%7%13%24%14%4
2451
11th to 20thDay
32%7%16%29%16%1
2445
21st to endDay
34%7%15%26%15%3
2557
August1st to 10thDay
33%7%14%31%13%2
2314
11th to 20thDay
38%6%13%26%15%1
2168
21st to endDay
31%6%13%26%17%7%
2376
September1st to 10thDay
38%5%11%26%17%4
2155
11th to 20thDay
33%6%11%26%21%4
1980
21st to endDay
34%410%26%23%3
1980
October1st to 10thDay
36%411%26%20%4
1980
11th to 20thDay
41%49%25%19%2
1828
21st to endDay
51%49%22%13%1
1782
November1st to 10thDay
35%313%26%18%4
1672
11th to 20thDay
48%38%22%14%4
1710
21st to endDay
52%39%22%12%2
1710
December1st to 10thDay
59%39%19%9%
1685
11th to 20thDay
59%37%23%8%1
1915
21st to endDay
73%29%11%5%
2783
January1st to 10thNight
57%47%21%11%1
2648
11th to 20thNight
62%310%17%7%1
2660
21st to endNight
61%210%17%9%1
2806
February1st to 10thNight
60%312%17%7%1
2160
11th to 20thNight
54%311%19%12%2
2099
21st to endNight
56%411%18%10%2
1776
March1st to 10thNight
50%310%22%13%2
2160
11th to 20thNight
47%411%23%12%3
2073
21st to endNight
53%411%22%8%2
2062
April1st to 10thNight
44%412%24%14%2
1800
11th to 20thNight
44%49%22%17%5%
1775
21st to endNight
47%410%21%13%4
1674
May1st to 10thNight
51%5%11%20%11%2
1620
11th to 20thNight
43%7%12%22%15%1
1593
21st to endNight
36%8%15%21%15%5%
1643
June1st to 10thNight
34%411%27%21%3
1440
11th to 20thNight
33%5%13%24%20%5%
1440
21st to endNight
33%7%15%24%18%4
1440
July1st to 10thNight
31%9%15%24%17%5%
1400
11th to 20thNight
25%5%15%32%20%2
1392
21st to endNight
28%5%14%30%20%3
1521
August1st to 10thNight
29%7%13%29%19%2
1600
11th to 20thNight
31%6%13%28%19%2
1730
21st to endNight
27%6%13%27%22%7%
1980
September1st to 10thNight
35%5%12%24%18%6%
1800
11th to 20thNight
28%410%28%25%4
1966
21st to endNight
34%49%24%24%4
1980
October1st to 10thNight
32%5%10%25%24%4
1980
11th to 20thNight
40%38%25%21%3
2127
21st to endNight
46%39%23%16%2
2574
November1st to 10thNight
35%49%27%21%4
2406
11th to 20thNight
43%39%24%17%3
2470
21st to endNight
53%38%23%12%1
2470
December1st to 10thNight
56%310%19%11%1
2493
11th to 20thNight
54%29%20%13%1
3281
21st to endNight
71%38%11%6%
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
24%14%34%21%6%1
270
11th to 20thDay
22%19%36%19%31
270
21st to endDay
24%18%31%22%5%
282
February1st to 10thDay
28%14%37%18%3
240
11th to 20thDay
26%20%33%16%6%
240
21st to endDay
28%14%37%18%3
198
March1st to 10thDay
22%25%35%15%4
240
11th to 20thDay
25%17%35%15%7%1
326
21st to endDay
29%15%31%18%8%
462
April1st to 10thDay
18%15%33%23%10%1
420
11th to 20thDay
20%18%27%20%13%2
412
21st to endDay
24%15%33%17%8%3
420
May1st to 10thDay
20%14%29%26%9%2
423
11th to 20thDay
19%9%28%27%13%5%
447
21st to endDay
11%427%27%20%11%
583
June1st to 10thDay
12%5%25%32%20%7%
630
11th to 20thDay
10%6%26%32%20%7%
630
21st to endDay
11%6%29%27%20%6%
630
July1st to 10thDay
10%316%26%25%20%
621
11th to 20thDay
8%317%34%23%14%
618
21st to endDay
10%215%32%31%10%
648
August1st to 10thDay
8%312%28%30%19%
446
11th to 20thDay
14%216%28%29%11%
439
21st to endDay
8%213%29%32%16%
495
September1st to 10thDay
11%415%29%30%11%
450
11th to 20thDay
9%414%26%31%16%
450
21st to endDay
13%9%20%24%22%11%
450
October1st to 10thDay
12%5%28%30%17%8%
450
11th to 20thDay
14%13%37%25%11%1
347
21st to endDay
28%15%35%20%2
297
November1st to 10thDay
12%12%33%25%14%4
270
11th to 20thDay
23%17%29%19%11%1
270
21st to endDay
23%11%37%24%4
270
December1st to 10thDay
17%22%35%20%5%1
270
11th to 20thDay
22%13%40%17%7%1
270
21st to endDay
28%18%33%17%5%
297
January1st to 10thNight
22%15%34%24%5%
950
11th to 20thNight
23%14%38%21%4
950
21st to endNight
22%14%36%25%3
996
February1st to 10thNight
26%11%37%24%2
720
11th to 20thNight
20%15%38%24%2
703
21st to endNight
24%13%39%22%2
592
March1st to 10thNight
22%14%34%25%5%
720
11th to 20thNight
20%13%37%23%6%1
720
21st to endNight
26%10%33%26%5%1
676
April1st to 10thNight
16%12%36%29%7%
540
11th to 20thNight
18%11%29%31%10%
533
21st to endNight
22%10%34%24%7%1
540
May1st to 10thNight
19%6%37%28%9%
540
11th to 20thNight
18%6%25%33%16%2
531
21st to endNight
10%322%38%23%2
584
June1st to 10thNight
12%322%43%19%1
540
11th to 20thNight
9%420%45%20%1
540
21st to endNight
7%321%42%26%1
540
July1st to 10thNight
10%19%40%33%6%
525
11th to 20thNight
7%216%38%33%4
522
21st to endNight
8%212%43%32%3
591
August1st to 10thNight
8%29%44%33%4
537
11th to 20thNight
8%111%41%34%4
534
21st to endNight
9%213%30%40%6%
594
September1st to 10thNight
14%312%35%33%3
540
11th to 20thNight
8%315%35%34%4
706
21st to endNight
12%6%19%35%25%3
720
October1st to 10thNight
10%6%24%36%21%4
720
11th to 20thNight
20%10%28%28%13%1
720
21st to endNight
23%11%33%27%7%
792
November1st to 10thNight
15%7%37%29%10%1
740
11th to 20thNight
16%16%32%27%8%1
760
21st to endNight
24%13%28%29%6%
760
December1st to 10thNight
22%13%38%22%4
783
11th to 20thNight
24%10%35%25%7%1
950
21st to endNight
29%15%31%22%4
1045
Page generated at 2024-01-24 08:37:29. Version ac07

Copyright 2024 Attilla Danko


McCloud Nature Park Clear Sky Chart |Charts Home