Torch Lake Township
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Torch Lake Township clear sky chart from 2005-11-06 to 2024-01-11.

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
32%
24363
11%
74960
8%
24310
36%
24310
15%
56974

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
10%
950
3%
2648
1%
946
12%
946
5%
2398
January11th to 20thNight
13%
905
4%
2533
2%
905
15%
905
5%
2298
January21st to endNight
14%
990
3%
2772
1%
990
15%
990
5%
2536
February1st to 10thNight
15%
802
4%
2422
2%
802
17%
802
6%
2148
February11th to 20thNight
18%
700
8%
2108
4%
700
22%
700
8%
1760
February21st to endNight
21%
592
9%
1776
3%
592
26%
592
10%
1443
March1st to 10thNight
32%
720
15%
2160
9%
720
37%
720
19%
1550
March11th to 20thNight
30%
720
17%
2031
9%
720
37%
720
21%
1461
March21st to endNight
34%
734
17%
2120
10%
734
40%
734
20%
1512
April1st to 10thNight
28%
540
11%
1800
8%
540
33%
540
14%
1303
April11th to 20thNight
38%
533
19%
1677
13%
533
44%
533
20%
1157
April21st to endNight
42%
540
16%
1620
10%
540
47%
540
23%
1102
May1st to 10thNight
42%
540
15%
1620
11%
540
46%
540
23%
1106
May11th to 20thNight
45%
531
16%
1507
13%
531
49%
531
22%
1057
May21st to endNight
55%
583
15%
1552
11%
582
60%
582
35%
980
June1st to 10thNight
50%
424
15%
1324
12%
424
54%
424
28%
826
June11th to 20thNight
55%
360
16%
1260
15%
360
58%
360
27%
744
June21st to endNight
54%
433
16%
1333
12%
433
58%
433
30%
817
July1st to 10thNight
67%
525
16%
1400
11%
525
70%
525
43%
797
July11th to 20thNight
60%
522
17%
1392
12%
522
63%
522
38%
844
July21st to endNight
60%
591
17%
1487
13%
558
60%
558
36%
914
August1st to 10thNight
65%
537
18%
1514
16%
534
67%
534
34%
907
August11th to 20thNight
64%
534
19%
1598
15%
534
68%
534
34%
953
August21st to endNight
55%
594
17%
1873
15%
594
58%
594
28%
1167
September1st to 10thNight
57%
547
17%
1807
16%
547
60%
547
28%
1082
September11th to 20thNight
53%
720
21%
1980
16%
720
57%
720
32%
1269
September21st to endNight
45%
720
17%
1980
13%
720
47%
720
25%
1369
October1st to 10thNight
40%
720
17%
1980
12%
720
44%
720
22%
1391
October11th to 20thNight
26%
720
9%
2257
6%
720
31%
720
12%
1769
October21st to endNight
22%
792
10%
2574
8%
792
26%
792
10%
2085
November1st to 10thNight
27%
740
14%
2406
11%
740
33%
740
13%
1796
November11th to 20thNight
15%
760
9%
2470
6%
760
19%
760
8%
2046
November21st to endNight
14%
807
5%
2614
4%
807
16%
807
7%
2244
December1st to 10thNight
11%
950
2%
2850
1%
950
12%
950
4%
2583
December11th to 20thNight
11%
950
2%
3519
1%
949
13%
949
4%
3127
December21st to endNight
9%
1037
2%
4996
0%
1026
11%
1026
2%
4433

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
15%11%5%8%6%3445%7%32%
74542
Night
16%14%6%10%7%34445%27%
75142
TransparencyDay
52%411%21%10%1
74248
Night
60%410%17%8%1
74971
SeeingDay
18%9%25%27%16%5%
14510
Night
22%9%26%30%12%1
24375

By Month

Percentage Cloud Cover NE (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%19%15%13%10%6%44338%
1517
11th to 20thDay
17%18%11%17%11%35%4347%
1440
21st to endDay
13%19%11%17%13%45%3239%
1584
February1st to 10thDay
10%16%9%15%18%44345%12%
1536
11th to 20thDay
14%14%8%13%11%5%5%336%17%
1734
21st to endDay
13%17%8%12%10%35%5%45%20%
1480
March1st to 10thDay
14%10%5%9%9%445%5%6%29%
1798
11th to 20thDay
11%10%6%8%6%45%5%46%35%
1927
21st to endDay
18%10%5%7%6%2445%7%32%
2252
April1st to 10thDay
20%13%5%7%6%3445%6%29%
2160
11th to 20thDay
20%12%45%42345%6%35%
2230
21st to endDay
16%10%47%6%345%6%7%33%
2340
May1st to 10thDay
15%7%36%6%3445%6%40%
2340
11th to 20thDay
14%8%36%5%3446%6%42%
2384
21st to endDay
11%6%25%5%25%5%6%8%44%
2725
June1st to 10thDay
14%435%435%47%8%45%
2632
11th to 20thDay
12%5%25%5%346%7%9%43%
2700
21st to endDay
14%6%25%425%5%5%9%42%
2621
July1st to 10thDay
8%42333446%9%53%
2520
11th to 20thDay
11%4244345%6%9%48%
2520
21st to endDay
9%5%244245%6%10%48%
2743
August1st to 10thDay
9%5%35%6%35%5%6%9%45%
2413
11th to 20thDay
11%5%245%45%6%5%8%46%
2303
21st to endDay
13%6%25%4345%5%7%46%
2480
September1st to 10thDay
16%5%245%345%6%7%43%
2134
11th to 20thDay
15%5%345%345%5%7%46%
1980
21st to endDay
19%5%35%5%36%6%6%8%36%
1980
October1st to 10thDay
22%8%37%6%34348%33%
1980
11th to 20thDay
26%15%5%9%6%45%445%18%
1702
21st to endDay
26%17%5%8%6%34445%16%
1782
November1st to 10thDay
18%19%5%7%434445%26%
1672
11th to 20thDay
15%26%8%12%6%34345%14%
1710
21st to endDay
19%24%11%11%43434413%
1561
December1st to 10thDay
17%24%16%15%7%232229%
1330
11th to 20thDay
16%23%10%16%10%35%3438%
1671
21st to endDay
20%21%11%14%8%433347%
2661
January1st to 10thNight
15%19%11%18%13%433349%
2648
11th to 20thNight
18%19%9%17%11%3333311%
2533
21st to endNight
14%19%9%16%14%5%5%3338%
2772
February1st to 10thNight
11%19%8%16%16%5%5%32311%
2422
11th to 20thNight
13%13%8%16%12%4434418%
2107
21st to endNight
16%18%6%12%8%35%345%20%
1776
March1st to 10thNight
12%12%5%9%7%44445%35%
2149
11th to 20thNight
12%11%5%9%7%4445%435%
2031
21st to endNight
17%9%37%6%35%5%6%6%33%
2120
April1st to 10thNight
20%11%48%6%35%45%6%27%
1800
11th to 20thNight
19%11%46%5%345%36%34%
1677
21st to endNight
17%10%45%6%345%46%36%
1620
May1st to 10thNight
15%9%36%6%5%6%5%5%8%34%
1620
11th to 20thNight
15%8%5%7%6%36%5%48%35%
1507
21st to endNight
12%6%25%5%345%5%8%45%
1551
June1st to 10thNight
13%5%35%6%45%448%43%
1324
11th to 20thNight
12%5%25%6%346%6%8%44%
1260
21st to endNight
12%7%25%5%25%5%5%7%46%
1333
July1st to 10thNight
10%3234246%6%9%51%
1440
11th to 20thNight
9%5%15%6%25%5%6%8%48%
1440
21st to endNight
8%5%35%5%235%6%9%49%
1575
August1st to 10thNight
8%5%245%35%5%6%10%47%
1523
11th to 20thNight
10%4244245%6%9%48%
1598
21st to endNight
15%5%25%5%44446%45%
1873
September1st to 10thNight
13%5%26%424447%47%
1807
11th to 20thNight
16%5%25%42436%7%44%
1980
21st to endNight
19%7%46%6%3445%7%35%
1980
October1st to 10thNight
21%8%36%5%43445%37%
1980
11th to 20thNight
26%13%47%6%4445%5%22%
2257
21st to endNight
29%16%47%6%3443420%
2574
November1st to 10thNight
19%16%48%5%34346%27%
2406
11th to 20thNight
19%23%8%10%6%3433417%
2470
21st to endNight
19%26%10%10%6%3333313%
2614
December1st to 10thNight
15%27%15%16%6%322229%
2850
11th to 20thNight
16%21%11%19%8%3333310%
3526
21st to endNight
24%21%10%12%7%443339%
4999

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
83%37%6%2
1518
11th to 20thDay
83%46%5%1
1440
21st to endDay
83%45%7%2
1584
February1st to 10thDay
77%48%9%1
1536
11th to 20thDay
72%5%9%11%3
1744
21st to endDay
68%49%15%4
1480
March1st to 10thDay
57%5%11%18%8%1
1800
11th to 20thDay
51%412%23%7%2
1927
21st to endDay
52%411%22%9%1
2252
April1st to 10thDay
57%310%19%10%
2160
11th to 20thDay
51%39%20%15%2
2230
21st to endDay
50%311%17%15%3
2340
May1st to 10thDay
45%39%26%13%3
2340
11th to 20thDay
43%39%24%17%3
2388
21st to endDay
37%6%13%27%16%2
2725
June1st to 10thDay
37%412%28%16%2
2632
11th to 20thDay
36%5%13%24%19%2
2700
21st to endDay
38%5%15%27%14%1
2621
July1st to 10thDay
26%5%14%32%21%2
2451
11th to 20thDay
32%5%14%31%17%2
2445
21st to endDay
31%6%14%29%19%1
2591
August1st to 10thDay
35%5%16%31%12%1
2398
11th to 20thDay
35%5%13%31%14%1
2303
21st to endDay
37%5%14%27%15%1
2480
September1st to 10thDay
40%5%12%26%16%1
2134
11th to 20thDay
38%416%31%10%1
1980
21st to endDay
45%415%26%9%
1980
October1st to 10thDay
51%411%24%9%1
1980
11th to 20thDay
68%310%15%3
1702
21st to endDay
71%412%11%3
1782
November1st to 10thDay
61%210%20%7%
1672
11th to 20thDay
73%212%10%3
1710
21st to endDay
76%312%8%1
1561
December1st to 10thDay
85%26%6%1
1330
11th to 20thDay
82%39%5%1
1671
21st to endDay
83%29%42
2661
January1st to 10thNight
82%37%6%2
2648
11th to 20thNight
83%36%6%2
2533
21st to endNight
83%36%6%1
2772
February1st to 10thNight
80%36%9%3
2422
11th to 20thNight
71%48%14%3
2108
21st to endNight
68%310%14%4
1776
March1st to 10thNight
54%412%23%8%
2160
11th to 20thNight
52%311%20%12%2
2032
21st to endNight
52%410%22%12%1
2120
April1st to 10thNight
57%49%18%12%1
1800
11th to 20thNight
51%38%22%14%3
1677
21st to endNight
49%311%21%14%3
1620
May1st to 10thNight
48%410%21%12%4
1620
11th to 20thNight
49%5%7%22%14%3
1508
21st to endNight
36%5%14%28%14%3
1552
June1st to 10thNight
42%311%27%16%1
1324
11th to 20thNight
38%5%14%24%17%2
1260
21st to endNight
37%5%13%27%16%2
1333
July1st to 10thNight
29%416%31%18%3
1400
11th to 20thNight
33%5%15%26%20%1
1392
21st to endNight
34%5%15%30%16%1
1487
August1st to 10thNight
34%5%17%30%12%1
1514
11th to 20thNight
34%5%15%29%15%1
1598
21st to endNight
40%5%14%25%16%1
1873
September1st to 10thNight
38%5%13%24%20%1
1807
11th to 20thNight
39%416%30%10%
1980
21st to endNight
48%416%25%8%
1980
October1st to 10thNight
51%310%23%12%1
1980
11th to 20thNight
64%411%16%5%
2257
21st to endNight
70%39%14%5%
2574
November1st to 10thNight
60%411%18%6%1
2406
11th to 20thNight
73%310%10%5%
2470
21st to endNight
76%311%8%1
2614
December1st to 10thNight
84%26%7%1
2850
11th to 20thNight
82%39%41
3525
21st to endNight
82%49%41
4999

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
20%13%32%23%9%2
270
11th to 20thDay
22%13%35%24%5%2
240
21st to endDay
23%9%30%28%8%1
264
February1st to 10thDay
20%20%37%19%31
240
11th to 20thDay
17%18%39%20%6%
240
21st to endDay
17%22%41%18%2
198
March1st to 10thDay
20%14%36%23%7%
240
11th to 20thDay
17%11%28%31%11%2
367
21st to endDay
26%8%26%25%14%1
462
April1st to 10thDay
24%13%27%25%10%1
420
11th to 20thDay
25%16%23%22%11%4
412
21st to endDay
19%10%25%28%15%3
420
May1st to 10thDay
21%11%25%24%15%4
423
11th to 20thDay
16%6%28%29%16%5%
530
21st to endDay
11%7%25%31%19%6%
679
June1st to 10thDay
13%6%25%31%19%5%
630
11th to 20thDay
14%6%24%32%19%5%
630
21st to endDay
14%423%33%23%4
630
July1st to 10thDay
8%320%34%24%10%
621
11th to 20thDay
11%5%19%33%23%8%
618
21st to endDay
9%421%35%24%7%
684
August1st to 10thDay
10%416%31%27%11%
532
11th to 20thDay
13%315%29%26%14%
439
21st to endDay
17%5%17%30%23%8%
495
September1st to 10thDay
18%6%20%26%22%10%
450
11th to 20thDay
15%6%16%28%25%10%
450
21st to endDay
20%10%17%24%23%7%
450
October1st to 10thDay
23%8%21%27%14%6%
450
11th to 20thDay
31%13%26%20%8%1
342
21st to endDay
31%13%28%20%6%2
297
November1st to 10thDay
26%16%26%19%11%1
270
11th to 20thDay
22%20%36%16%6%
270
21st to endDay
27%18%36%16%4
222
December1st to 10thDay
32%17%26%19%6%1
180
11th to 20thDay
24%22%29%19%41
180
21st to endDay
29%17%33%18%21
265
January1st to 10thNight
23%14%33%23%6%1
950
11th to 20thNight
25%14%30%23%7%1
905
21st to endNight
22%10%33%26%8%1
990
February1st to 10thNight
19%13%33%29%6%
802
11th to 20thNight
20%13%34%26%7%
703
21st to endNight
25%13%31%26%5%
592
March1st to 10thNight
17%10%31%30%12%1
720
11th to 20thNight
17%10%35%31%8%1
720
21st to endNight
21%7%28%33%10%1
734
April1st to 10thNight
25%9%28%29%8%1
540
11th to 20thNight
23%11%23%31%11%1
533
21st to endNight
20%6%25%37%11%1
540
May1st to 10thNight
18%5%26%36%15%1
540
11th to 20thNight
19%5%23%37%16%1
531
21st to endNight
17%218%39%21%3
584
June1st to 10thNight
14%321%41%20%1
424
11th to 20thNight
11%420%43%21%1
360
21st to endNight
11%421%39%23%2
433
July1st to 10thNight
11%212%43%29%3
525
11th to 20thNight
11%216%40%27%4
522
21st to endNight
10%218%40%27%2
591
August1st to 10thNight
10%212%44%29%2
537
11th to 20thNight
12%413%36%31%5%
534
21st to endNight
16%5%15%39%22%3
594
September1st to 10thNight
16%317%36%23%4
547
11th to 20thNight
18%418%33%23%4
720
21st to endNight
22%8%18%29%19%4
720
October1st to 10thNight
24%7%20%30%17%1
720
11th to 20thNight
32%12%23%26%7%1
720
21st to endNight
38%10%22%23%6%1
792
November1st to 10thNight
28%11%26%28%6%1
740
11th to 20thNight
30%15%31%20%4
760
21st to endNight
31%15%30%21%4
807
December1st to 10thNight
28%19%30%20%3
950
11th to 20thNight
26%13%36%20%41
950
21st to endNight
30%12%34%22%3
1045
Page generated at 2024-01-08 11:14:15. Version ac07

Copyright 2024 Attilla Danko


Torch Lake Township Clear Sky Chart |Charts Home