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 2026-06-01.

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%	131891
	Night	14% 12% 5% 11% 7% 6% 5% 4 6% 6% 26%	131281
Transparency	Day	54% 7% 11% 18% 9% 1	135372
	Night	56% 7% 12% 16% 8% 1	135887
Seeing	Day	23% 18% 28% 18% 9% 3	16746
	Night	21% 15% 26% 27% 10% 1	25652

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	10% 14% 7% 15% 10% 8% 5% 4 4 5% 18%	4661
	11th to 20th	Day	7% 13% 8% 18% 12% 6% 6% 4 5% 5% 15%	4650
	21st to end	Day	6% 10% 5% 15% 10% 10% 7% 4 5% 5% 23%	5124
February	1st to 10th	Day	11% 12% 5% 12% 10% 6% 6% 3 4 6% 24%	1800
	11th to 20th	Day	9% 13% 6% 15% 8% 7% 5% 5% 4 6% 22%	2048
	21st to end	Day	12% 15% 3 11% 6% 7% 5% 4 6% 6% 25%	1730
March	1st to 10th	Day	16% 15% 6% 15% 6% 6% 4 2 4 4 22%	4576
	11th to 20th	Day	13% 13% 6% 10% 6% 4 4 4 5% 5% 30%	4888
	21st to end	Day	18% 13% 7% 11% 5% 4 4 3 4 6% 26%	5905
April	1st to 10th	Day	17% 17% 5% 9% 5% 5% 4 3 3 4 28%	2520
	11th to 20th	Day	16% 12% 4 8% 4 4 4 4 5% 6% 32%	2560
	21st to end	Day	19% 14% 4 8% 5% 4 4 3 4 5% 29%	2730
May	1st to 10th	Day	29% 14% 3 8% 4 4 4 3 4 5% 20%	6016
	11th to 20th	Day	19% 11% 4 10% 6% 5% 5% 4 5% 6% 25%	6355
	21st to end	Day	19% 8% 2 7% 4 5% 5% 5% 7% 8% 29%	7103
June	1st to 10th	Day	22% 9% 3 8% 5% 5% 4 4 6% 7% 25%	2800
	11th to 20th	Day	17% 8% 3 7% 5% 5% 5% 4 7% 8% 32%	2800
	21st to end	Day	21% 8% 3 8% 5% 5% 5% 5% 6% 6% 26%	2800
July	1st to 10th	Day	14% 8% 2 8% 5% 6% 7% 6% 8% 10% 26%	6360
	11th to 20th	Day	12% 6% 2 7% 5% 6% 7% 5% 7% 11% 32%	6360
	21st to end	Day	13% 7% 3 6% 4 5% 6% 4 6% 8% 37%	6926
August	1st to 10th	Day	14% 8% 3 9% 6% 7% 7% 5% 6% 8% 27%	4410
	11th to 20th	Day	14% 7% 4 11% 6% 6% 6% 5% 7% 9% 25%	4175
	21st to end	Day	13% 7% 3 8% 5% 5% 5% 4 7% 9% 36%	4388
September	1st to 10th	Day	12% 6% 2 7% 5% 4 6% 5% 6% 7% 41%	2400
	11th to 20th	Day	14% 7% 3 7% 4 4 4 3 4 6% 44%	2205
	21st to end	Day	14% 9% 3 7% 5% 4 4 4 6% 8% 37%	2200
October	1st to 10th	Day	19% 10% 3 8% 5% 5% 4 3 5% 6% 33%	2200
	11th to 20th	Day	14% 13% 3 9% 5% 4 4 4 6% 6% 32%	1885
	21st to end	Day	18% 17% 4 8% 5% 5% 4 3 4 6% 25%	1980
November	1st to 10th	Day	13% 14% 4 9% 6% 4 4 5% 5% 7% 30%	1851
	11th to 20th	Day	14% 14% 5% 11% 5% 5% 5% 5% 6% 5% 25%	1890
	21st to end	Day	15% 15% 4 12% 6% 5% 4 4 6% 7% 22%	1801
December	1st to 10th	Day	12% 16% 5% 21% 9% 5% 4 4 5% 4 16%	2680
	11th to 20th	Day	14% 14% 7% 11% 6% 5% 5% 3 4 5% 26%	3066
	21st to end	Day	16% 15% 5% 14% 5% 5% 5% 3 4 5% 23%	4048
January	1st to 10th	Night	9% 15% 8% 17% 10% 6% 5% 3 5% 5% 16%	8234
	11th to 20th	Night	9% 16% 9% 17% 12% 7% 6% 4 5% 4 12%	8235
	21st to end	Night	9% 9% 4 13% 8% 11% 7% 5% 6% 6% 21%	9057
February	1st to 10th	Night	9% 12% 5% 11% 9% 7% 6% 5% 7% 7% 22%	2818
	11th to 20th	Night	8% 11% 7% 13% 9% 7% 7% 6% 6% 6% 21%	2458
	21st to end	Night	10% 14% 4 11% 7% 6% 5% 4 6% 5% 28%	2076
March	1st to 10th	Night	16% 16% 6% 13% 6% 6% 5% 3 4 4 20%	5484
	11th to 20th	Night	12% 13% 7% 10% 6% 5% 6% 4 5% 6% 26%	5290
	21st to end	Night	16% 15% 5% 11% 6% 4 4 3 4 6% 25%	5265
April	1st to 10th	Night	17% 13% 4 10% 6% 5% 4 4 4 5% 28%	2100
	11th to 20th	Night	18% 11% 4 7% 5% 4 4 3 5% 6% 32%	2008
	21st to end	Night	19% 10% 4 10% 4 4 4 3 6% 5% 32%	1890
May	1st to 10th	Night	28% 13% 3 7% 5% 4 4 3 5% 5% 22%	4144
	11th to 20th	Night	20% 10% 3 8% 5% 4 4 4 5% 7% 28%	3801
	21st to end	Night	18% 8% 3 7% 5% 4 5% 3 6% 7% 34%	4014
June	1st to 10th	Night	21% 10% 4 7% 5% 4 5% 3 5% 6% 31%	1600
	11th to 20th	Night	15% 8% 3 6% 5% 4 5% 3 6% 9% 36%	1600
	21st to end	Night	17% 8% 2 8% 5% 5% 5% 4 8% 8% 30%	1600
July	1st to 10th	Night	13% 7% 3 8% 6% 5% 6% 5% 7% 9% 32%	3600
	11th to 20th	Night	15% 7% 3 8% 6% 5% 5% 4 6% 7% 35%	3600
	21st to end	Night	9% 6% 2 7% 6% 5% 5% 4 6% 9% 42%	3926
August	1st to 10th	Night	19% 9% 4 9% 5% 5% 4 4 5% 6% 31%	2708
	11th to 20th	Night	12% 7% 3 9% 6% 5% 6% 4 7% 8% 32%	2872
	21st to end	Night	12% 7% 2 8% 5% 5% 4 4 6% 7% 40%	3508
September	1st to 10th	Night	12% 7% 2 6% 4 4 4 5% 6% 7% 44%	2000
	11th to 20th	Night	13% 6% 2 5% 4 5% 4 3 5% 6% 47%	2195
	21st to end	Night	14% 8% 3 5% 4 5% 4 4 5% 7% 40%	2200
October	1st to 10th	Night	16% 10% 3 7% 4 4 5% 4 5% 6% 35%	2200
	11th to 20th	Night	16% 13% 3 7% 5% 5% 5% 4 5% 7% 31%	2509
	21st to end	Night	20% 13% 3 7% 6% 4 5% 4 6% 7% 25%	2860
November	1st to 10th	Night	15% 12% 4 9% 5% 5% 4 4 5% 7% 29%	2667
	11th to 20th	Night	14% 12% 7% 10% 6% 5% 4 4 6% 6% 27%	2730
	21st to end	Night	14% 11% 5% 13% 7% 6% 6% 4 6% 5% 24%	2814
December	1st to 10th	Night	13% 12% 6% 20% 9% 5% 5% 4 6% 5% 14%	4720
	11th to 20th	Night	17% 15% 5% 14% 7% 6% 5% 4 6% 5% 17%	5348
	21st to end	Night	15% 15% 4 13% 6% 5% 5% 4 6% 6% 20%	7150

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	68% 5% 10% 12% 5%	4662
	11th to 20th	Day	67% 6% 9% 10% 6% 2	4680
	21st to end	Day	58% 6% 11% 12% 12% 1	5124
February	1st to 10th	Day	61% 6% 8% 16% 9% 2	1800
	11th to 20th	Day	63% 5% 10% 12% 7% 2	2057
	21st to end	Day	57% 7% 10% 14% 9% 3	1730
March	1st to 10th	Day	65% 6% 7% 8% 9% 5%	4579
	11th to 20th	Day	53% 6% 14% 15% 9% 3	4888
	21st to end	Day	59% 3 6% 15% 14% 2	5905
April	1st to 10th	Day	60% 4 8% 15% 10% 3	2520
	11th to 20th	Day	52% 5% 10% 19% 12% 1	2560
	21st to end	Day	57% 5% 8% 17% 10% 3	2730
May	1st to 10th	Day	66% 7% 7% 15% 5% 1	6027
	11th to 20th	Day	57% 9% 11% 16% 6% 2	6359
	21st to end	Day	48% 8% 12% 22% 10%	7103
June	1st to 10th	Day	55% 7% 11% 20% 6% 1	2800
	11th to 20th	Day	48% 6% 12% 21% 11% 1	2800
	21st to end	Day	55% 8% 10% 18% 8% 1	2800
July	1st to 10th	Day	49% 8% 18% 18% 8%	6290
	11th to 20th	Day	42% 9% 16% 24% 8%	6285
	21st to end	Day	42% 7% 13% 29% 9%	6728
August	1st to 10th	Day	51% 9% 14% 19% 6%	4396
	11th to 20th	Day	52% 9% 15% 19% 5%	4214
	21st to end	Day	40% 8% 16% 20% 13% 2	4388
September	1st to 10th	Day	39% 7% 12% 28% 13%	2400
	11th to 20th	Day	40% 5% 11% 28% 15% 2	2205
	21st to end	Day	44% 6% 13% 22% 14% 1	2200
October	1st to 10th	Day	50% 6% 11% 20% 12%	3590
	11th to 20th	Day	49% 5% 11% 25% 10%	3036
	21st to end	Day	47% 5% 16% 19% 12% 1	3180
November	1st to 10th	Day	53% 6% 12% 18% 11% 1	1851
	11th to 20th	Day	60% 7% 10% 11% 11% 2	1890
	21st to end	Day	61% 6% 14% 14% 4 1	1801
December	1st to 10th	Day	71% 6% 10% 8% 4	2680
	11th to 20th	Day	60% 5% 9% 12% 13% 1	3066
	21st to end	Day	64% 5% 7% 10% 12% 3	4048
January	1st to 10th	Night	69% 5% 10% 11% 4	8234
	11th to 20th	Night	73% 5% 10% 7% 4 1	8280
	21st to end	Night	58% 7% 10% 12% 10% 2	9057
February	1st to 10th	Night	58% 7% 10% 15% 8% 1	2818
	11th to 20th	Night	60% 7% 10% 14% 8% 1	2460
	21st to end	Night	56% 6% 9% 16% 11% 2	2076
March	1st to 10th	Night	67% 5% 7% 11% 9% 2	5494
	11th to 20th	Night	57% 7% 16% 12% 7% 1	5291
	21st to end	Night	60% 4 6% 14% 14% 1	5265
April	1st to 10th	Night	59% 5% 8% 15% 12% 1	2100
	11th to 20th	Night	53% 6% 9% 20% 12%	2008
	21st to end	Night	54% 5% 10% 17% 12% 2	1890
May	1st to 10th	Night	63% 8% 10% 13% 6%	4150
	11th to 20th	Night	54% 9% 11% 19% 7% 1	3802
	21st to end	Night	47% 8% 14% 20% 9% 1	4015
June	1st to 10th	Night	54% 7% 9% 21% 9%	1600
	11th to 20th	Night	44% 7% 14% 22% 11% 2	1600
	21st to end	Night	49% 10% 14% 19% 8% 1	1600
July	1st to 10th	Night	46% 8% 19% 20% 7%	3560
	11th to 20th	Night	44% 9% 14% 26% 7%	3552
	21st to end	Night	38% 7% 19% 29% 7%	3809
August	1st to 10th	Night	52% 7% 14% 22% 5%	2698
	11th to 20th	Night	47% 11% 18% 16% 8%	2899
	21st to end	Night	41% 8% 15% 22% 14%	3508
September	1st to 10th	Night	37% 8% 15% 29% 11%	2000
	11th to 20th	Night	37% 6% 12% 30% 13% 1	2195
	21st to end	Night	42% 7% 13% 25% 12% 1	2200
October	1st to 10th	Night	46% 8% 15% 20% 10% 1	3590
	11th to 20th	Night	50% 6% 15% 20% 9%	4097
	21st to end	Night	49% 6% 15% 20% 10% 1	4610
November	1st to 10th	Night	54% 6% 12% 19% 8% 1	2667
	11th to 20th	Night	57% 6% 10% 16% 9% 2	2730
	21st to end	Night	59% 8% 11% 15% 6%	2814
December	1st to 10th	Night	70% 7% 9% 11% 3	4720
	11th to 20th	Night	66% 7% 8% 11% 9%	5348
	21st to end	Night	63% 6% 8% 13% 10% 1	7150

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	26% 23% 30% 15% 5%	220
	11th to 20th	Day	25% 30% 23% 16% 5% 1	220
	21st to end	Day	19% 24% 31% 19% 5%	242
February	1st to 10th	Day	25% 29% 26% 15% 5% 1	319
	11th to 20th	Day	28% 27% 28% 15% 2	536
	21st to end	Day	26% 25% 27% 19% 3	446
March	1st to 10th	Day	25% 23% 31% 17% 4	540
	11th to 20th	Day	30% 23% 27% 14% 5% 1	540
	21st to end	Day	31% 21% 25% 15% 6% 2	594
April	1st to 10th	Day	35% 20% 26% 14% 5% 1	540
	11th to 20th	Day	30% 23% 24% 15% 5% 2	532
	21st to end	Day	29% 22% 26% 14% 7% 2	540
May	1st to 10th	Day	36% 19% 25% 14% 4 2	543
	11th to 20th	Day	23% 18% 32% 15% 9% 2	567
	21st to end	Day	19% 19% 35% 19% 6% 1	617
June	1st to 10th	Day	25% 16% 32% 18% 8% 2	530
	11th to 20th	Day	19% 17% 29% 21% 12% 2	530
	21st to end	Day	21% 14% 35% 18% 9% 4	530
July	1st to 10th	Day	18% 12% 35% 22% 11% 3	525
	11th to 20th	Day	15% 10% 35% 24% 11% 3	524
	21st to end	Day	15% 11% 35% 25% 12% 2	576
August	1st to 10th	Day	14% 9% 29% 25% 17% 5%	526
	11th to 20th	Day	15% 9% 31% 22% 15% 8%	519
	21st to end	Day	14% 14% 27% 24% 15% 6%	583
September	1st to 10th	Day	14% 14% 27% 20% 20% 4	530
	11th to 20th	Day	18% 11% 25% 18% 17% 12%	530
	21st to end	Day	17% 14% 25% 20% 16% 8%	530
October	1st to 10th	Day	21% 15% 23% 22% 15% 5%	530
	11th to 20th	Day	23% 19% 24% 19% 12% 2	447
	21st to end	Day	27% 22% 25% 18% 8%	462
November	1st to 10th	Day	29% 18% 25% 19% 8% 1	425
	11th to 20th	Day	28% 21% 26% 17% 7% 1	430
	21st to end	Day	31% 20% 26% 14% 7% 1	341
December	1st to 10th	Day	26% 26% 25% 15% 8%	220
	11th to 20th	Day	30% 24% 28% 11% 5% 1	220
	21st to end	Day	31% 22% 25% 15% 6% 1	242
January	1st to 10th	Night	21% 21% 31% 23% 4	840
	11th to 20th	Night	23% 20% 27% 25% 5%	840
	21st to end	Night	17% 20% 33% 24% 5%	924
February	1st to 10th	Night	19% 20% 33% 24% 5%	840
	11th to 20th	Night	20% 23% 30% 24% 3	823
	21st to end	Night	21% 20% 30% 26% 3	692
March	1st to 10th	Night	23% 18% 32% 24% 2	840
	11th to 20th	Night	25% 18% 27% 23% 6%	840
	21st to end	Night	22% 19% 28% 24% 7% 1	924
April	1st to 10th	Night	29% 18% 28% 19% 5%	840
	11th to 20th	Night	24% 18% 26% 25% 7%	764
	21st to end	Night	26% 17% 27% 22% 7%	630
May	1st to 10th	Night	26% 13% 26% 26% 9% 1	630
	11th to 20th	Night	19% 11% 28% 30% 10% 1	482
	21st to end	Night	16% 9% 27% 35% 13%	455
June	1st to 10th	Night	26% 9% 24% 31% 10% 1	400
	11th to 20th	Night	16% 8% 26% 32% 19% 1	400
	21st to end	Night	21% 6% 20% 40% 13%	400
July	1st to 10th	Night	13% 3 24% 41% 18% 1	390
	11th to 20th	Night	15% 4 16% 39% 23% 2	388
	21st to end	Night	13% 3 18% 45% 19% 2	438
August	1st to 10th	Night	15% 6% 18% 37% 24%	468
	11th to 20th	Night	14% 6% 23% 34% 22% 1	592
	21st to end	Night	15% 7% 20% 33% 22% 2	828
September	1st to 10th	Night	13% 8% 23% 34% 20% 2	800
	11th to 20th	Night	17% 9% 18% 28% 24% 5%	800
	21st to end	Night	17% 9% 23% 30% 19% 3	800
October	1st to 10th	Night	22% 10% 19% 30% 18% 1	800
	11th to 20th	Night	21% 14% 26% 25% 11% 2	800
	21st to end	Night	26% 16% 26% 26% 6%	880
November	1st to 10th	Night	23% 18% 23% 27% 9%	820
	11th to 20th	Night	21% 20% 26% 22% 9% 1	840
	21st to end	Night	25% 20% 22% 26% 6% 1	840
December	1st to 10th	Night	27% 21% 26% 21% 5%	840
	11th to 20th	Night	28% 21% 25% 21% 5%	840
	21st to end	Night	27% 20% 26% 23% 4	924

Page generated at 2026-05-29 01:53:32. Version ac07

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