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 2005-11-06 to 2025-02-06.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	15% 11% 4 10% 6% 5% 5% 4 5% 7% 27%	108325
	Night	14% 12% 5% 11% 7% 5% 5% 4 6% 6% 26%	109930
Transparency	Day	54% 7% 11% 18% 9% 1	111854
	Night	56% 7% 11% 16% 9% 1	114565
Seeing	Day	23% 18% 28% 18% 10% 3	15020
	Night	21% 15% 25% 27% 10% 1	24008

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 15% 7% 16% 9% 6% 4 4 3 5% 19%	3597
	11th to 20th	Day	8% 12% 6% 18% 12% 6% 5% 4 6% 5% 17%	3570
	21st to end	Day	8% 11% 6% 15% 8% 7% 6% 4 5% 5% 25%	3960
February	1st to 10th	Day	12% 13% 6% 11% 10% 6% 7% 3 4 6% 23%	1667
	11th to 20th	Day	9% 14% 7% 15% 8% 7% 5% 5% 4 5% 21%	1848
	21st to end	Day	13% 15% 3 11% 6% 7% 5% 4 6% 6% 24%	1570
March	1st to 10th	Day	18% 16% 6% 11% 6% 5% 5% 3 4 4 22%	3116
	11th to 20th	Day	14% 17% 8% 12% 6% 4 4 3 4 4 25%	3339
	21st to end	Day	16% 13% 6% 12% 6% 4 3 3 3 5% 28%	4029
April	1st to 10th	Day	18% 16% 5% 9% 5% 5% 4 2 3 4 28%	2280
	11th to 20th	Day	16% 11% 3 8% 5% 5% 5% 5% 5% 6% 33%	2314
	21st to end	Day	19% 15% 5% 9% 6% 4 4 3 4 5% 27%	2470
May	1st to 10th	Day	24% 12% 3 8% 4 5% 5% 4 5% 6% 25%	4106
	11th to 20th	Day	18% 10% 4 10% 7% 6% 5% 4 6% 6% 25%	4325
	21st to end	Day	13% 7% 3 7% 5% 5% 5% 5% 8% 9% 33%	4837
June	1st to 10th	Day	23% 10% 3 8% 5% 5% 4 4 6% 7% 25%	2660
	11th to 20th	Day	17% 8% 3 7% 5% 5% 5% 4 7% 8% 32%	2660
	21st to end	Day	21% 9% 3 8% 6% 5% 5% 5% 6% 6% 25%	2660
July	1st to 10th	Day	13% 7% 2 7% 5% 6% 6% 5% 8% 10% 30%	4440
	11th to 20th	Day	12% 6% 2 7% 5% 6% 7% 5% 8% 11% 31%	4440
	21st to end	Day	14% 8% 3 7% 5% 6% 6% 5% 6% 7% 32%	4814
August	1st to 10th	Day	15% 9% 3 9% 6% 7% 7% 5% 6% 8% 26%	4275
	11th to 20th	Day	14% 8% 4 11% 6% 6% 6% 5% 7% 9% 24%	4045
	21st to end	Day	13% 7% 3 7% 5% 5% 5% 4 7% 9% 36%	4254
September	1st to 10th	Day	12% 6% 2 7% 5% 4 6% 5% 5% 7% 41%	2280
	11th to 20th	Day	15% 7% 3 7% 4 4 4 2 4 6% 44%	2095
	21st to end	Day	14% 9% 3 8% 5% 4 4 4 6% 8% 36%	2090
October	1st to 10th	Day	20% 10% 3 9% 5% 5% 5% 3 5% 6% 30%	2090
	11th to 20th	Day	14% 13% 3 9% 5% 4 5% 4 6% 6% 32%	1791
	21st to end	Day	18% 17% 4 8% 5% 5% 4 3 4 6% 25%	1881
November	1st to 10th	Day	13% 13% 4 9% 6% 4 4 5% 5% 7% 31%	1761
	11th to 20th	Day	14% 13% 4 11% 6% 5% 5% 5% 6% 5% 25%	1800
	21st to end	Day	15% 15% 4 11% 5% 5% 4 4 6% 7% 23%	1715
December	1st to 10th	Day	12% 16% 5% 21% 10% 5% 4 4 5% 4 15%	2600
	11th to 20th	Day	14% 15% 7% 10% 5% 5% 4 3 4 5% 26%	2986
	21st to end	Day	16% 15% 5% 14% 5% 5% 5% 3 4 5% 23%	3960
January	1st to 10th	Night	10% 15% 8% 19% 10% 6% 4 3 5% 5% 16%	6349
	11th to 20th	Night	8% 16% 7% 16% 13% 7% 6% 4 5% 4 13%	6315
	21st to end	Night	10% 11% 5% 13% 7% 7% 5% 5% 7% 7% 23%	6996
February	1st to 10th	Night	10% 13% 5% 10% 9% 7% 6% 5% 7% 7% 21%	2622
	11th to 20th	Night	8% 11% 7% 13% 8% 7% 7% 6% 6% 7% 21%	2218
	21st to end	Night	11% 14% 4 11% 7% 6% 5% 4 6% 5% 28%	1884
March	1st to 10th	Night	19% 16% 6% 8% 6% 6% 4 3 4 5% 24%	3724
	11th to 20th	Night	12% 16% 9% 10% 6% 5% 5% 4 4 5% 24%	3619
	21st to end	Night	18% 17% 5% 10% 6% 3 3 3 3 6% 25%	3599
April	1st to 10th	Night	17% 13% 4 9% 6% 5% 4 4 4 5% 28%	1900
	11th to 20th	Night	17% 10% 4 7% 6% 4 4 3 6% 6% 33%	1815
	21st to end	Night	19% 10% 4 10% 4 4 4 3 6% 5% 31%	1710
May	1st to 10th	Night	25% 11% 3 7% 5% 4 5% 4 5% 6% 26%	2834
	11th to 20th	Night	18% 10% 4 9% 6% 5% 5% 4 6% 7% 27%	2596
	21st to end	Night	14% 7% 2 6% 5% 4 5% 4 7% 8% 38%	2738
June	1st to 10th	Night	21% 9% 4 7% 5% 4 5% 3 5% 6% 30%	1520
	11th to 20th	Night	15% 8% 3 6% 5% 4 5% 4 6% 9% 35%	1520
	21st to end	Night	18% 8% 2 8% 5% 5% 5% 4 8% 8% 29%	1520
July	1st to 10th	Night	11% 7% 3 8% 7% 5% 6% 5% 7% 8% 32%	2520
	11th to 20th	Night	17% 7% 3 7% 5% 5% 5% 3 6% 7% 35%	2520
	21st to end	Night	11% 7% 3 8% 6% 5% 5% 3 7% 8% 38%	2739
August	1st to 10th	Night	19% 9% 4 9% 6% 5% 4 4 5% 6% 30%	2624
	11th to 20th	Night	13% 7% 3 9% 6% 5% 7% 5% 7% 8% 31%	2782
	21st to end	Night	12% 8% 2 8% 5% 5% 4 3 6% 7% 40%	3400
September	1st to 10th	Night	12% 7% 2 6% 4 4 4 5% 6% 7% 44%	1900
	11th to 20th	Night	14% 7% 2 5% 4 5% 3 3 4 6% 47%	2085
	21st to end	Night	14% 8% 3 5% 4 6% 4 4 5% 7% 40%	2090
October	1st to 10th	Night	17% 11% 3 7% 5% 4 5% 5% 6% 6% 33%	2090
	11th to 20th	Night	16% 12% 3 7% 5% 5% 5% 4 5% 7% 31%	2383
	21st to end	Night	20% 12% 3 7% 6% 4 5% 4 7% 6% 26%	2717
November	1st to 10th	Night	14% 11% 4 10% 5% 5% 4 4 6% 7% 30%	2537
	11th to 20th	Night	14% 12% 5% 10% 6% 5% 4 4 6% 7% 28%	2600
	21st to end	Night	14% 11% 5% 12% 7% 6% 5% 5% 6% 5% 24%	2680
December	1st to 10th	Night	14% 12% 6% 20% 9% 5% 5% 4 6% 5% 13%	4580
	11th to 20th	Night	17% 15% 5% 14% 6% 6% 5% 4 6% 5% 17%	5208
	21st to end	Night	16% 15% 4 13% 6% 5% 5% 4 6% 6% 21%	6996

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	69% 4 9% 14% 5%	3598
	11th to 20th	Day	65% 6% 8% 12% 6% 2	3600
	21st to end	Day	57% 6% 10% 12% 13% 2	3960
February	1st to 10th	Day	62% 6% 8% 15% 8% 2	1667
	11th to 20th	Day	64% 5% 10% 12% 7% 2	1857
	21st to end	Day	57% 7% 10% 14% 9% 3	1570
March	1st to 10th	Day	66% 5% 7% 9% 11% 2	3119
	11th to 20th	Day	61% 5% 9% 11% 10% 3	3339
	21st to end	Day	59% 3 6% 15% 15% 2	4029
April	1st to 10th	Day	60% 4 8% 15% 10% 3	2280
	11th to 20th	Day	51% 5% 11% 20% 12% 1	2314
	21st to end	Day	59% 5% 8% 16% 9% 3	2470
May	1st to 10th	Day	59% 7% 8% 18% 7% 1	4120
	11th to 20th	Day	55% 9% 13% 15% 7% 1	4329
	21st to end	Day	43% 9% 13% 24% 11%	4837
June	1st to 10th	Day	56% 7% 11% 20% 6% 1	2660
	11th to 20th	Day	48% 6% 12% 20% 11% 2	2660
	21st to end	Day	56% 8% 10% 17% 8% 1	2660
July	1st to 10th	Day	45% 8% 16% 22% 9%	4370
	11th to 20th	Day	43% 10% 17% 26% 5%	4365
	21st to end	Day	47% 7% 12% 25% 8%	4661
August	1st to 10th	Day	52% 9% 14% 18% 6%	4261
	11th to 20th	Day	52% 10% 15% 19% 5%	4084
	21st to end	Day	40% 9% 16% 20% 13% 2	4254
September	1st to 10th	Day	40% 7% 12% 28% 13%	2280
	11th to 20th	Day	41% 5% 11% 28% 14% 2	2095
	21st to end	Day	45% 6% 14% 22% 12% 1	2090
October	1st to 10th	Day	51% 6% 11% 20% 11%	3480
	11th to 20th	Day	49% 5% 12% 24% 10%	2942
	21st to end	Day	46% 5% 16% 20% 12% 1	3081
November	1st to 10th	Day	51% 6% 12% 18% 12% 1	1761
	11th to 20th	Day	59% 7% 10% 11% 11% 2	1800
	21st to end	Day	59% 6% 15% 15% 5% 1	1715
December	1st to 10th	Day	72% 6% 10% 8% 4	2600
	11th to 20th	Day	60% 5% 9% 12% 13% 1	2986
	21st to end	Day	64% 5% 7% 9% 12% 3	3960
January	1st to 10th	Night	71% 4 10% 11% 3	6349
	11th to 20th	Night	73% 5% 10% 8% 3 1	6360
	21st to end	Night	57% 6% 10% 13% 12% 2	6996
February	1st to 10th	Night	59% 8% 10% 14% 8% 1	2622
	11th to 20th	Night	60% 7% 10% 14% 8% 1	2220
	21st to end	Night	56% 6% 9% 16% 11% 2	1884
March	1st to 10th	Night	64% 4 8% 14% 8% 2	3734
	11th to 20th	Night	62% 6% 10% 12% 9% 1	3620
	21st to end	Night	62% 3 5% 15% 14% 2	3599
April	1st to 10th	Night	59% 5% 8% 16% 12% 1	1900
	11th to 20th	Night	51% 6% 10% 21% 12%	1815
	21st to end	Night	55% 5% 10% 15% 12% 2	1710
May	1st to 10th	Night	56% 9% 11% 16% 7% 1	2840
	11th to 20th	Night	53% 8% 13% 17% 7% 1	2597
	21st to end	Night	41% 9% 16% 20% 13% 1	2739
June	1st to 10th	Night	54% 7% 9% 21% 8%	1520
	11th to 20th	Night	44% 7% 14% 22% 10% 2	1520
	21st to end	Night	50% 10% 14% 18% 8% 1	1520
July	1st to 10th	Night	45% 10% 16% 19% 9%	2480
	11th to 20th	Night	45% 8% 14% 27% 6%	2472
	21st to end	Night	43% 7% 15% 27% 8%	2651
August	1st to 10th	Night	53% 7% 14% 22% 5%	2614
	11th to 20th	Night	47% 11% 18% 16% 8%	2809
	21st to end	Night	42% 8% 15% 22% 14%	3400
September	1st to 10th	Night	37% 8% 15% 29% 11%	1900
	11th to 20th	Night	38% 6% 12% 30% 13% 1	2085
	21st to end	Night	42% 7% 13% 25% 11% 1	2090
October	1st to 10th	Night	47% 9% 15% 20% 9%	3480
	11th to 20th	Night	50% 6% 15% 21% 9%	3971
	21st to end	Night	49% 6% 15% 20% 10% 1	4467
November	1st to 10th	Night	53% 6% 13% 19% 8% 1	2537
	11th to 20th	Night	55% 6% 10% 17% 10% 2	2600
	21st to end	Night	59% 8% 11% 15% 6%	2680
December	1st to 10th	Night	71% 7% 9% 11% 3	4580
	11th to 20th	Night	66% 7% 8% 11% 9%	5208
	21st to end	Night	63% 6% 8% 13% 10% 1	6996

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	27% 24% 30% 15% 5%	200
	11th to 20th	Day	25% 28% 23% 18% 6% 1	200
	21st to end	Day	18% 24% 32% 20% 6%	220
February	1st to 10th	Day	28% 28% 25% 14% 4	276
	11th to 20th	Day	28% 29% 28% 14% 1	456
	21st to end	Day	28% 24% 26% 19% 3	382
March	1st to 10th	Day	26% 20% 33% 17% 4	460
	11th to 20th	Day	29% 23% 27% 14% 5% 1	460
	21st to end	Day	28% 21% 25% 16% 7% 3	506
April	1st to 10th	Day	34% 19% 25% 14% 5% 2	460
	11th to 20th	Day	28% 23% 23% 16% 6% 3	452
	21st to end	Day	29% 23% 26% 13% 8% 2	460
May	1st to 10th	Day	35% 17% 25% 14% 5% 3	463
	11th to 20th	Day	22% 17% 33% 16% 9% 2	487
	21st to end	Day	18% 17% 36% 20% 7% 2	529
June	1st to 10th	Day	26% 16% 31% 18% 8% 2	490
	11th to 20th	Day	19% 17% 29% 21% 12% 2	490
	21st to end	Day	21% 14% 34% 18% 9% 4	490
July	1st to 10th	Day	19% 11% 33% 22% 12% 4	485
	11th to 20th	Day	15% 11% 36% 24% 11% 3	484
	21st to end	Day	15% 11% 34% 26% 12% 2	532
August	1st to 10th	Day	15% 9% 31% 24% 16% 4	486
	11th to 20th	Day	16% 10% 31% 23% 15% 6%	479
	21st to end	Day	14% 14% 27% 23% 15% 7%	539
September	1st to 10th	Day	14% 14% 27% 20% 20% 4	490
	11th to 20th	Day	19% 11% 25% 17% 17% 11%	490
	21st to end	Day	17% 14% 26% 20% 16% 8%	490
October	1st to 10th	Day	21% 15% 23% 21% 15% 5%	490
	11th to 20th	Day	22% 19% 25% 19% 13% 3	415
	21st to end	Day	27% 21% 25% 18% 8%	429
November	1st to 10th	Day	28% 17% 25% 20% 9% 1	395
	11th to 20th	Day	29% 20% 25% 18% 7% 1	400
	21st to end	Day	32% 20% 26% 13% 7% 1	315
December	1st to 10th	Day	26% 27% 26% 14% 8%	200
	11th to 20th	Day	32% 23% 29% 11% 6% 2	200
	21st to end	Day	32% 21% 25% 15% 6% 1	220
January	1st to 10th	Night	21% 22% 31% 22% 4	800
	11th to 20th	Night	23% 19% 27% 25% 5%	800
	21st to end	Night	17% 20% 34% 24% 5%	880
February	1st to 10th	Night	19% 21% 33% 23% 4	781
	11th to 20th	Night	20% 24% 30% 24% 3	743
	21st to end	Night	22% 20% 30% 25% 3	628
March	1st to 10th	Night	24% 17% 32% 25% 3	760
	11th to 20th	Night	25% 18% 27% 23% 7%	760
	21st to end	Night	23% 18% 27% 23% 8% 1	836
April	1st to 10th	Night	28% 17% 29% 20% 6%	760
	11th to 20th	Night	22% 17% 26% 26% 7%	691
	21st to end	Night	26% 17% 26% 23% 7%	570
May	1st to 10th	Night	25% 12% 26% 26% 10% 1	570
	11th to 20th	Night	19% 11% 28% 30% 10% 1	436
	21st to end	Night	15% 9% 26% 36% 14%	411
June	1st to 10th	Night	26% 8% 24% 31% 10% 1	380
	11th to 20th	Night	17% 7% 26% 31% 19% 1	380
	21st to end	Night	21% 6% 20% 39% 13%	380
July	1st to 10th	Night	14% 4 24% 39% 19% 1	370
	11th to 20th	Night	15% 5% 17% 39% 22% 2	368
	21st to end	Night	13% 3 17% 45% 20% 2	416
August	1st to 10th	Night	16% 7% 18% 36% 23%	444
	11th to 20th	Night	14% 6% 23% 34% 21% 1	562
	21st to end	Night	15% 7% 20% 33% 23% 2	786
September	1st to 10th	Night	14% 8% 23% 34% 20% 2	760
	11th to 20th	Night	18% 9% 18% 28% 23% 5%	760
	21st to end	Night	17% 9% 23% 30% 19% 3	760
October	1st to 10th	Night	23% 10% 19% 29% 17% 1	760
	11th to 20th	Night	21% 14% 26% 25% 12% 2	760
	21st to end	Night	27% 16% 26% 25% 6%	836
November	1st to 10th	Night	22% 17% 23% 28% 9%	780
	11th to 20th	Night	21% 19% 26% 23% 9% 1	800
	21st to end	Night	26% 20% 21% 26% 6% 2	800
December	1st to 10th	Night	28% 21% 26% 20% 5%	800
	11th to 20th	Night	28% 21% 25% 21% 5%	800
	21st to end	Night	27% 20% 26% 24% 4	880

Page generated at 2025-02-03 03:05:56. Version ac07

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