Great Northern Moose Lodge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Great Northern Moose Lodge clear sky chart from 2005-11-05 to 2018-03-21.

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
31%
15452
13%
49207
8%
15420
37%
15420
14%
35816

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 15thNight
21%
780
11%
2716
6%
776
27%
776
9%
2042
January16th to endNight
17%
832
9%
2912
3%
832
26%
832
8%
2233
February1st to 15thNight
18%
764
10%
2476
4%
761
26%
761
8%
1939
February16th to endNight
18%
683
11%
2049
5%
683
27%
683
11%
1567
March1st to 15thNight
21%
780
12%
2335
7%
780
28%
780
11%
1804
March16th to endNight
27%
792
19%
2096
8%
792
36%
792
17%
1523
April1st to 15thNight
26%
718
15%
1796
5%
718
32%
718
17%
1377
April16th to endNight
29%
561
14%
1641
6%
561
35%
561
17%
1153
May1st to 15thNight
31%
519
13%
1599
8%
519
37%
519
15%
1154
May16th to endNight
36%
375
12%
1497
13%
374
44%
374
14%
1041
June1st to 15thNight
32%
360
8%
1440
8%
360
39%
360
12%
1056
June16th to endNight
50%
360
8%
1440
11%
360
54%
360
18%
943
July1st to 15thNight
53%
340
11%
1360
16%
340
57%
340
19%
855
July16th to endNight
59%
376
12%
1418
16%
354
61%
354
20%
899
August1st to 15thNight
51%
461
12%
1532
10%
459
53%
459
21%
1005
August16th to endNight
53%
674
18%
1820
11%
674
55%
674
32%
1139
September1st to 15thNight
48%
720
15%
1857
8%
720
52%
720
30%
1259
September16th to endNight
52%
717
24%
1980
18%
717
55%
717
31%
1241
October1st to 15thNight
37%
720
15%
2046
9%
720
44%
720
19%
1458
October16th to endNight
25%
768
11%
2496
6%
768
32%
768
11%
1880
November1st to 15thNight
30%
760
15%
2472
11%
760
37%
760
13%
1802
November16th to endNight
29%
780
15%
2587
10%
780
37%
780
12%
1917
December1st to 15thNight
18%
780
7%
2730
2%
780
23%
780
7%
2166
December16th to endNight
15%
832
8%
2912
4%
832
21%
832
5%
2363

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
16%10%47%6%35%5%5%6%27%
49650
Night
14%9%47%6%35%5%6%6%29%
49377
Cloud CoverDay
16%10%48%6%35%5%5%6%27%
49660
Night
14%9%47%7%45%5%5%6%29%
49382
TransparencyDay
55%6%10%17%8%1
49338
Night
52%7%11%18%8%
49207
SeeingDay
22%14%26%20%11%4
6322
Night
20%14%25%27%11%1
15452

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 15thDay
13%8%412%9%5%6%7%5%7%17%
1552
16th to endDay
10%10%6%8%10%46%5%7%8%23%
1664
February1st to 15thDay
11%13%6%10%10%5%7%446%19%
1714
16th to endDay
10%14%6%11%7%46%5%5%5%21%
1710
March1st to 15thDay
15%14%6%8%7%45%445%23%
1944
16th to endDay
13%10%5%10%8%2344432%
2253
April1st to 15thDay
16%13%5%7%5%2433431%
2152
16th to endDay
17%11%46%6%34445%32%
2319
May1st to 15thDay
23%10%37%5%34445%27%
2361
16th to endDay
19%8%36%5%36%5%6%7%27%
2618
June1st to 15thDay
27%8%36%5%35%447%23%
2520
16th to endDay
21%7%36%6%35%5%5%6%27%
2520
July1st to 15thDay
14%7%37%5%48%5%6%9%27%
2520
16th to endDay
15%6%36%7%48%6%6%8%26%
2654
August1st to 15thDay
16%7%27%6%47%5%7%8%27%
2406
16th to endDay
13%5%26%5%346%6%9%36%
2381
September1st to 15thDay
15%7%26%5%24436%39%
2103
16th to endDay
13%7%345%3245%7%42%
1980
October1st to 15thDay
18%10%37%6%33445%31%
1911
16th to endDay
16%16%38%6%35%446%26%
1728
November1st to 15thDay
15%12%5%8%6%25%5%5%6%27%
1716
16th to endDay
14%11%410%7%346%5%7%25%
1700
December1st to 15thDay
16%14%7%9%7%4445%420%
1560
16th to endDay
17%13%7%12%7%46%45%5%17%
1664
January1st to 15thNight
10%9%410%9%5%6%6%8%8%20%
2716
16th to endNight
11%8%6%9%8%5%7%8%7%6%20%
2912
February1st to 15thNight
9%10%5%9%9%5%8%6%7%7%18%
2475
16th to endNight
10%12%6%10%7%45%6%5%6%25%
2049
March1st to 15thNight
14%12%6%7%6%37%5%45%26%
2322
16th to endNight
10%9%5%6%7%35%5%5%435%
2096
April1st to 15thNight
16%9%47%7%445%46%30%
1796
16th to endNight
17%8%37%42435%5%36%
1641
May1st to 15thNight
18%10%25%6%3345%6%30%
1599
16th to endNight
18%7%35%5%3446%8%30%
1495
June1st to 15thNight
24%8%36%5%25%346%28%
1440
16th to endNight
15%7%25%425%47%9%34%
1440
July1st to 15thNight
13%6%25%5%35%47%9%36%
1440
16th to endNight
12%425%6%35%5%6%9%38%
1514
August1st to 15thNight
13%6%25%6%35%47%7%37%
1542
16th to endNight
11%5%1442345%7%48%
1820
September1st to 15thNight
15%5%144345%46%43%
1857
16th to endNight
12%5%33433346%48%
1980
October1st to 15thNight
16%8%36%5%345%5%6%34%
2046
16th to endNight
20%10%26%7%345%5%6%25%
2496
November1st to 15thNight
15%10%47%6%345%5%7%28%
2472
16th to endNight
13%8%38%7%45%5%6%5%29%
2587
December1st to 15thNight
18%13%5%7%8%35%5%6%6%18%
2730
16th to endNight
16%14%5%10%8%46%5%6%6%15%
2912

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 15thDay
12%9%412%11%38%5%5%7%17%
1552
16th to endDay
10%9%6%10%10%46%5%6%7%22%
1664
February1st to 15thDay
11%12%6%11%11%47%5%45%20%
1714
16th to endDay
9%15%6%13%7%45%5%5%5%21%
1710
March1st to 15thDay
15%14%5%10%7%35%44423%
1954
16th to endDay
13%11%5%11%7%3443332%
2253
April1st to 15thDay
15%13%5%7%6%3434431%
2152
16th to endDay
17%12%36%5%33446%32%
2319
May1st to 15thDay
23%10%46%5%3444428%
2361
16th to endDay
19%8%36%5%35%5%6%7%27%
2618
June1st to 15thDay
27%9%36%5%34447%23%
2520
16th to endDay
20%7%37%5%35%5%5%6%27%
2520
July1st to 15thDay
14%6%37%6%47%5%6%9%27%
2520
16th to endDay
15%6%37%7%47%6%6%8%26%
2654
August1st to 15thDay
16%7%37%7%46%5%6%7%28%
2406
16th to endDay
13%5%36%5%346%6%8%36%
2381
September1st to 15thDay
15%7%37%5%33336%39%
2103
16th to endDay
13%7%25%5%2335%7%42%
1980
October1st to 15thDay
17%11%37%6%34345%32%
1911
16th to endDay
15%15%5%7%6%34436%26%
1728
November1st to 15thDay
15%11%5%7%6%35%5%5%6%28%
1716
16th to endDay
13%11%5%11%7%25%5%6%6%25%
1700
December1st to 15thDay
15%15%7%9%8%34445%20%
1560
16th to endDay
16%15%7%11%8%35%45%416%
1664
January1st to 15thNight
9%9%5%11%9%5%7%6%7%7%20%
2716
16th to endNight
10%8%6%9%10%5%7%7%6%6%20%
2912
February1st to 15thNight
9%10%5%10%9%6%8%7%6%6%18%
2468
16th to endNight
10%12%7%11%8%35%5%46%25%
2049
March1st to 15thNight
14%13%6%8%6%45%5%45%25%
2335
16th to endNight
11%9%47%7%36%45%435%
2095
April1st to 15thNight
16%10%47%7%45%45%5%29%
1796
16th to endNight
17%9%37%5%24345%35%
1641
May1st to 15thNight
18%9%35%5%45%45%6%30%
1599
16th to endNight
17%8%36%5%3446%7%30%
1495
June1st to 15thNight
25%8%46%5%34246%28%
1440
16th to endNight
14%7%25%425%5%7%10%33%
1440
July1st to 15thNight
12%5%25%5%445%6%9%36%
1440
16th to endNight
12%5%25%5%36%6%6%9%37%
1514
August1st to 15thNight
14%5%25%5%445%5%9%36%
1542
16th to endNight
12%42442345%7%47%
1820
September1st to 15thNight
14%6%3343345%7%42%
1857
16th to endNight
12%5%24334346%48%
1980
October1st to 15thNight
16%8%36%6%3445%5%34%
2046
16th to endNight
18%10%38%7%45%5%46%25%
2496
November1st to 15thNight
14%11%48%6%4445%7%27%
2472
16th to endNight
13%7%49%8%45%5%5%6%29%
2587
December1st to 15thNight
17%13%5%8%8%37%5%5%5%19%
2730
16th to endNight
15%13%7%10%9%46%5%5%5%15%
2912

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 15thDay
62%7%8%14%6%1
1553
16th to endDay
57%5%11%15%8%
1664
February1st to 15thDay
64%5%8%14%5%
1717
16th to endDay
62%5%9%11%8%2
1710
March1st to 15thDay
63%5%8%12%8%2
1954
16th to endDay
55%48%15%13%3
2253
April1st to 15thDay
56%47%17%11%2
2152
16th to endDay
52%5%10%17%10%3
2319
May1st to 15thDay
58%47%18%9%1
2361
16th to endDay
53%8%10%17%9%
2622
June1st to 15thDay
60%5%11%16%5%
2520
16th to endDay
54%7%10%19%7%
2520
July1st to 15thDay
49%8%14%20%6%
2371
16th to endDay
52%8%13%19%5%
2487
August1st to 15thDay
51%9%14%18%5%
2392
16th to endDay
42%6%14%24%11%
2381
September1st to 15thDay
45%5%10%25%12%
2103
16th to endDay
40%5%11%27%15%
1980
October1st to 15thDay
53%5%10%21%8%
1911
16th to endDay
58%412%16%7%
1728
November1st to 15thDay
55%6%11%15%10%1
1716
16th to endDay
57%6%12%13%7%1
1700
December1st to 15thDay
65%6%8%13%6%
1560
16th to endDay
68%5%7%8%9%
1664
January1st to 15thNight
58%7%12%15%6%
2716
16th to endNight
58%8%9%13%7%
2912
February1st to 15thNight
60%8%9%14%6%
2476
16th to endNight
58%6%10%14%9%1
2049
March1st to 15thNight
59%6%7%16%8%1
2335
16th to endNight
50%5%8%17%15%3
2096
April1st to 15thNight
54%5%7%18%12%
1796
16th to endNight
50%5%10%18%13%2
1641
May1st to 15thNight
52%6%7%19%11%1
1599
16th to endNight
51%7%12%21%6%
1497
June1st to 15thNight
57%6%9%19%6%
1440
16th to endNight
43%10%15%21%9%1
1440
July1st to 15thNight
41%8%16%23%9%
1360
16th to endNight
41%9%15%25%7%
1418
August1st to 15thNight
43%8%17%25%5%
1532
16th to endNight
34%7%18%27%12%
1820
September1st to 15thNight
39%6%12%30%9%
1857
16th to endNight
36%5%11%32%13%1
1980
October1st to 15thNight
48%7%11%21%10%
2046
16th to endNight
57%6%10%17%7%
2496
November1st to 15thNight
54%6%11%18%8%1
2472
16th to endNight
54%8%10%17%8%1
2587
December1st to 15thNight
64%7%9%13%5%
2730
16th to endNight
67%6%9%9%6%
2912

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 15thDay
21%24%24%22%7%
90
16th to endDay
14%30%27%22%41
96
February1st to 15thDay
25%22%28%19%3
219
16th to endDay
22%26%23%22%4
291
March1st to 15thDay
26%18%29%20%5%
330
16th to endDay
23%19%26%16%10%4
311
April1st to 15thDay
28%15%26%19%7%2
270
16th to endDay
22%18%26%17%9%5%
270
May1st to 15thDay
35%12%25%12%8%5%
288
16th to endDay
22%14%33%20%7%1
331
June1st to 15thDay
29%14%26%17%10%1
315
16th to endDay
21%9%33%22%10%2
315
July1st to 15thDay
18%8%33%22%13%4
305
16th to endDay
15%7%28%28%16%3
326
August1st to 15thDay
20%6%29%20%18%5%
313
16th to endDay
14%12%21%22%19%10%
332
September1st to 15thDay
15%8%25%20%23%6%
315
16th to endDay
14%12%19%15%21%15%
314
October1st to 15thDay
18%12%23%21%16%7%
307
16th to endDay
25%19%24%21%9%
288
November1st to 15thDay
25%15%21%24%11%1
280
16th to endDay
28%17%22%17%11%2
230
December1st to 15thDay
20%28%26%14%10%
90
16th to endDay
35%22%30%9%2
96
January1st to 15thNight
17%21%31%24%4
780
16th to endNight
20%19%29%25%4
832
February1st to 15thNight
18%20%32%24%4
764
16th to endNight
20%21%30%23%4
683
March1st to 15thNight
25%16%29%25%2
780
16th to endNight
18%18%28%23%9%
792
April1st to 15thNight
23%17%28%23%7%
718
16th to endNight
23%17%25%24%8%
561
May1st to 15thNight
22%12%26%25%10%1
519
16th to endNight
18%6%26%34%12%
375
June1st to 15thNight
29%6%24%29%10%
360
16th to endNight
17%422%38%17%
360
July1st to 15thNight
13%123%37%22%1
340
16th to endNight
14%115%42%23%1
376
August1st to 15thNight
15%319%37%23%
461
16th to endNight
13%419%34%24%2
674
September1st to 15thNight
17%6%21%33%18%2
720
16th to endNight
15%6%19%29%24%4
717
October1st to 15thNight
21%11%20%27%16%1
720
16th to endNight
26%17%25%22%8%
768
November1st to 15thNight
21%15%22%26%12%1
760
16th to endNight
21%18%21%27%10%2
780
December1st to 15thNight
30%19%24%21%3
780
16th to endNight
27%22%25%20%3
832
Page generated at 2018-03-22 11:34:27. Version ac04

Copyright 2018 A. Danko


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