Cuddeback Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cuddeback Lake clear sky chart from 2005-11-06 to 2024-03-06.

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
64%
24330
37%
79536
29%
24246
74%
24246
55%
34219

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
61%
751
38%
4274
29%
736
69%
736
33%
1512
January11th to 20thNight
64%
752
34%
4156
33%
740
75%
740
34%
1635
January21st to endNight
54%
827
27%
3897
29%
814
68%
814
30%
1826
February1st to 10thNight
55%
760
37%
2280
30%
760
66%
760
45%
1135
February11th to 20thNight
57%
740
39%
2218
30%
740
71%
740
51%
1024
February21st to endNight
53%
628
34%
1884
26%
628
66%
628
47%
891
March1st to 10thNight
50%
742
32%
2225
24%
742
65%
742
44%
1061
March11th to 20thNight
54%
720
31%
2102
22%
720
66%
720
49%
1017
March21st to endNight
48%
792
38%
2012
17%
792
63%
792
54%
1026
April1st to 10thNight
51%
720
38%
1800
17%
720
64%
720
55%
910
April11th to 20thNight
50%
711
39%
1779
16%
711
61%
711
61%
847
April21st to endNight
55%
720
40%
1800
16%
720
66%
720
65%
835
May1st to 10thNight
46%
572
40%
1652
20%
572
58%
572
65%
669
May11th to 20thNight
55%
531
42%
1595
26%
531
65%
531
65%
641
May21st to endNight
53%
583
38%
1746
22%
582
63%
582
69%
660
June1st to 10thNight
59%
506
37%
1586
27%
506
68%
506
72%
584
June11th to 20thNight
66%
360
43%
1440
40%
360
81%
360
77%
422
June21st to endNight
73%
360
42%
1440
41%
360
85%
360
79%
422
July1st to 10thNight
83%
350
41%
1400
42%
350
91%
350
75%
431
July11th to 20thNight
79%
370
38%
1414
40%
370
83%
370
60%
518
July21st to endNight
77%
622
38%
1704
29%
588
79%
588
65%
759
August1st to 10thNight
75%
716
37%
1780
22%
712
77%
712
77%
816
August11th to 20thNight
81%
712
41%
1780
24%
712
83%
712
82%
784
August21st to endNight
82%
792
45%
1980
28%
792
84%
792
81%
894
September1st to 10thNight
80%
720
44%
1800
30%
720
84%
720
76%
829
September11th to 20thNight
75%
720
48%
1959
34%
720
86%
720
83%
789
September21st to endNight
79%
720
48%
1980
38%
720
89%
720
83%
785
October1st to 10thNight
71%
720
43%
1980
31%
720
84%
720
70%
861
October11th to 20thNight
76%
720
47%
2056
40%
720
85%
720
71%
856
October21st to endNight
70%
792
45%
2484
39%
792
82%
792
67%
967
November1st to 10thNight
72%
740
40%
2405
38%
740
81%
740
62%
951
November11th to 20thNight
77%
760
40%
2470
40%
760
84%
760
63%
1000
November21st to endNight
67%
760
39%
2470
37%
760
75%
760
54%
1067
December1st to 10thNight
63%
760
36%
2470
30%
760
73%
760
46%
1150
December11th to 20thNight
59%
760
32%
2931
29%
759
68%
759
34%
1446
December21st to endNight
56%
821
21%
4587
28%
817
68%
817
24%
2199

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
2212223346%74%
79023
Night
2212323346%73%
80519
TransparencyDay
13%36%15%26%37%
78741
Night
13%47%17%28%32%
80323
SeeingDay
5%12%24%30%22%7%
14475
Night
38%21%36%28%4
24376

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
321232335%8%68%
2539
11th to 20thDay
5%4144245%5%9%57%
2646
21st to endDay
6%42432446%8%55%
3498
February1st to 10thDay
4222323346%67%
1900
11th to 20thDay
422222345%7%68%
1850
21st to endDay
431332245%5%67%
1570
March1st to 10thDay
432332446%8%61%
1851
11th to 20thDay
232332447%8%63%
1858
21st to endDay
21112245%47%72%
2340
April1st to 10thDay
2212323348%70%
2160
11th to 20thDay
221322223478%
2129
21st to endDay
111213347%77%
2160
May1st to 10thDay
111112237%81%
2308
11th to 20thDay
1211112235%81%
2301
21st to endDay
2212212235%79%
2530
June1st to 10thDay
1211112335%80%
2367
11th to 20thDay
11122488%
2520
21st to endDay
111221212386%
2520
July1st to 10thDay
111121223482%
2520
11th to 20thDay
2212323335%76%
2494
21st to endDay
2212323346%71%
2509
August1st to 10thDay
1212212225%82%
2149
11th to 20thDay
111111223484%
2122
21st to endDay
11121223483%
2376
September1st to 10thDay
111122224381%
2160
11th to 20thDay
111123388%
1999
21st to endDay
1111112388%
1980
October1st to 10thDay
211221232479%
1980
11th to 20thDay
111121223483%
1900
21st to endDay
1111211235%82%
1869
November1st to 10thDay
1111113345%80%
1674
11th to 20thDay
221232225%6%75%
1710
21st to endDay
311322235%8%71%
1710
December1st to 10thDay
23134335%5%9%63%
1710
11th to 20thDay
45%25%4345%7%8%52%
2169
21st to endDay
5%6%26%5%45%5%6%7%51%
2945
January1st to 10thNight
3424322246%69%
4406
11th to 20thNight
23234345%6%10%59%
4297
21st to endNight
45%2443345%7%59%
4180
February1st to 10thNight
4423323336%67%
2280
11th to 20thNight
3313423346%70%
2218
21st to endNight
431332245%7%66%
1884
March1st to 10thNight
22134245%6%8%64%
2225
11th to 20thNight
331232346%10%63%
2102
21st to endNight
2212223447%71%
2012
April1st to 10thNight
2212223347%71%
1800
11th to 20thNight
1212223346%76%
1779
21st to endNight
1212112236%80%
1800
May1st to 10thNight
12112246%81%
1652
11th to 20thNight
1112112235%81%
1594
21st to endNight
11111225%85%
1746
June1st to 10thNight
11212225%84%
1586
11th to 20thNight
111112389%
1440
21st to endNight
111212388%
1440
July1st to 10thNight
111111123486%
1440
11th to 20thNight
1213323335%75%
1462
21st to endNight
2212222446%73%
1804
August1st to 10thNight
211111223481%
1790
11th to 20thNight
11121123386%
1780
21st to endNight
11111122385%
1980
September1st to 10thNight
111221222384%
1800
11th to 20thNight
111212388%
1959
21st to endNight
111212389%
1980
October1st to 10thNight
11121223481%
1980
11th to 20thNight
111222225%82%
2056
21st to endNight
11111133483%
2484
November1st to 10thNight
1212112246%77%
2405
11th to 20thNight
1112213346%76%
2470
21st to endNight
321222335%6%71%
2470
December1st to 10thNight
3313423337%67%
2470
11th to 20thNight
5%42432447%10%56%
3041
21st to endNight
4425%6%35%5%6%8%53%
4707

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
15%5%8%31%32%9%
2539
11th to 20thDay
21%7%15%25%22%10%
2646
21st to endDay
25%5%10%27%23%9%
3498
February1st to 10thDay
19%37%20%28%22%
1900
11th to 20thDay
16%37%18%34%22%
1860
21st to endDay
17%5%9%21%30%17%
1570
March1st to 10thDay
19%47%21%29%19%
1851
11th to 20thDay
17%410%21%27%22%
1858
21st to endDay
12%49%23%32%19%
2340
April1st to 10thDay
15%37%21%30%24%
2160
11th to 20thDay
12%26%17%34%29%
2132
21st to endDay
8%37%19%35%29%
2160
May1st to 10thDay
7%25%18%33%35%
2308
11th to 20thDay
8%2314%35%37%
2304
21st to endDay
11%25%14%37%31%
2530
June1st to 10thDay
8%25%12%25%48%
2367
11th to 20thDay
3128%21%64%
2520
21st to endDay
8%12312%73%
2520
July1st to 10thDay
8%136%13%69%
2451
11th to 20thDay
12%349%18%55%
2419
21st to endDay
14%37%11%23%43%
2370
August1st to 10thDay
8%236%14%67%
2135
11th to 20thDay
6%237%22%61%
2122
21st to endDay
8%125%21%63%
2376
September1st to 10thDay
9%245%16%65%
2160
11th to 20thDay
4136%26%60%
1999
21st to endDay
6%127%29%56%
1980
October1st to 10thDay
11%2411%28%44%
1980
11th to 20thDay
8%2310%29%48%
1900
21st to endDay
8%2311%30%46%
1869
November1st to 10thDay
9%25%14%40%30%
1674
11th to 20thDay
12%37%18%29%32%
1710
21st to endDay
14%38%17%31%28%
1710
December1st to 10thDay
19%5%9%21%27%20%
1710
11th to 20thDay
24%12%10%18%25%10%
2168
21st to endDay
29%9%10%24%20%8%
2945
January1st to 10thNight
18%47%21%40%11%
4406
11th to 20thNight
18%7%13%30%22%11%
4297
21st to endNight
23%6%11%24%25%11%
4180
February1st to 10thNight
21%37%17%26%25%
2280
11th to 20thNight
17%37%18%30%26%
2219
21st to endNight
17%49%21%29%20%
1884
March1st to 10thNight
16%5%9%23%28%18%
2225
11th to 20thNight
15%6%11%18%28%22%
2102
21st to endNight
14%5%9%25%32%15%
2012
April1st to 10thNight
15%38%24%28%22%
1800
11th to 20thNight
11%26%22%33%25%
1779
21st to endNight
9%25%22%41%21%
1800
May1st to 10thNight
6%36%21%36%28%
1652
11th to 20thNight
8%25%15%39%31%
1595
21st to endNight
5%16%21%41%25%
1746
June1st to 10thNight
6%1414%29%45%
1586
11th to 20thNight
41311%22%59%
1440
21st to endNight
4135%15%72%
1440
July1st to 10thNight
6%23414%73%
1400
11th to 20thNight
12%25%7%19%54%
1414
21st to endNight
12%45%10%26%42%
1704
August1st to 10thNight
8%247%20%59%
1780
11th to 20thNight
6%236%22%61%
1780
21st to endNight
7%12423%62%
1980
September1st to 10thNight
9%24424%58%
1800
11th to 20thNight
4238%27%57%
1959
21st to endNight
4127%29%56%
1980
October1st to 10thNight
9%2312%28%46%
1980
11th to 20thNight
8%2310%28%49%
2056
21st to endNight
8%349%27%50%
2484
November1st to 10thNight
10%25%14%37%32%
2405
11th to 20thNight
11%36%16%28%36%
2470
21st to endNight
15%36%17%28%31%
2470
December1st to 10thNight
19%47%17%29%23%
2470
11th to 20thNight
21%8%12%20%27%12%
3041
21st to endNight
25%9%11%25%21%9%
4707

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%13%29%33%16%1
180
11th to 20thDay
13%16%19%29%17%6%
232
21st to endDay
10%14%23%28%21%3
506
February1st to 10thDay
9%19%23%29%14%6%
460
11th to 20thDay
9%19%28%25%15%4
455
21st to endDay
10%18%30%27%14%1
382
March1st to 10thDay
14%22%29%21%13%1
441
11th to 20thDay
9%19%31%23%15%3
420
21st to endDay
7%27%29%24%11%2
462
April1st to 10thDay
8%15%30%28%16%4
420
11th to 20thDay
6%23%34%21%12%4
412
21st to endDay
5%20%28%21%19%7%
420
May1st to 10thDay
6%18%33%25%14%4
423
11th to 20thDay
5%15%28%27%18%6%
448
21st to endDay
5%15%25%28%19%7%
485
June1st to 10thDay
411%27%29%19%10%
450
11th to 20thDay
29%29%26%24%10%
450
21st to endDay
18%28%28%24%11%
450
July1st to 10thDay
1326%35%25%11%
446
11th to 20thDay
219%39%25%16%
444
21st to endDay
3115%39%28%14%
487
August1st to 10thDay
2423%33%25%13%
447
11th to 20thDay
2315%36%28%16%
437
21st to endDay
2219%38%27%13%
495
September1st to 10thDay
26%18%30%31%13%
450
11th to 20thDay
18%24%32%25%8%
450
21st to endDay
210%18%31%29%10%
450
October1st to 10thDay
411%21%33%26%6%
450
11th to 20thDay
39%19%34%30%6%
450
21st to endDay
5%8%21%26%32%9%
384
November1st to 10thDay
413%17%32%29%4
270
11th to 20thDay
47%20%36%27%6%
270
21st to endDay
6%10%21%34%26%4
270
December1st to 10thDay
411%23%39%22%1
270
11th to 20thDay
49%22%32%29%3
270
21st to endDay
12%18%21%30%18%2
239
January1st to 10thNight
8%8%17%37%25%5%
760
11th to 20thNight
46%21%41%26%3
760
21st to endNight
7%9%23%35%23%2
836
February1st to 10thNight
6%11%21%34%24%4
760
11th to 20thNight
413%23%35%21%5%
744
21st to endNight
6%14%23%38%16%2
628
March1st to 10thNight
419%23%34%18%2
742
11th to 20thNight
412%25%30%24%4
720
21st to endNight
5%16%30%31%17%2
792
April1st to 10thNight
414%28%32%19%2
720
11th to 20thNight
215%31%31%19%2
711
21st to endNight
214%27%30%23%4
720
May1st to 10thNight
213%37%31%15%2
572
11th to 20thNight
113%28%31%25%2
531
21st to endNight
215%29%35%18%1
584
June1st to 10thNight
19%29%40%19%1
506
11th to 20thNight
428%42%25%1
360
21st to endNight
1322%44%29%1
360
July1st to 10thNight
1113%49%33%2
350
11th to 20thNight
212%51%33%1
370
21st to endNight
2115%46%33%2
622
August1st to 10thNight
2118%42%34%3
716
11th to 20thNight
1115%37%41%5%
712
21st to endNight
2113%39%39%7%
792
September1st to 10thNight
2313%34%43%6%
720
11th to 20thNight
320%33%38%6%
720
21st to endNight
415%33%41%7%
720
October1st to 10thNight
26%18%39%31%4
720
11th to 20thNight
15%14%37%34%8%
720
21st to endNight
28%18%29%34%9%
792
November1st to 10thNight
210%14%36%32%6%
740
11th to 20thNight
15%13%42%34%5%
760
21st to endNight
46%18%37%31%3
760
December1st to 10thNight
6%8%18%40%26%4
760
11th to 20thNight
9%8%20%39%23%2
760
21st to endNight
6%10%21%39%21%3
836
Page generated at 2024-03-03 03:28:54. Version ac07

Copyright © 2024 Attilla Danko.


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