Moose Hill Wildlife Sanctuary
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moose Hill Wildlife Sanctuary clear sky chart from 2005-11-06 to 2025-05-11.

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 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	17% 8% 2 6% 4 4 4 3 5% 6% 39%	113440
	Night	17% 8% 3 6% 4 4 4 3 5% 6% 40%	115491
Transparency	Day	44% 5% 11% 22% 15% 3	117021
	Night	44% 5% 11% 21% 16% 3	120061
Seeing	Day	24% 18% 33% 17% 6% 2	15690
	Night	22% 16% 34% 22% 6% 1	24705

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	11% 9% 3 7% 4 3 4 3 4 6% 46%	3597
	11th to 20th	Day	14% 9% 3 5% 3 3 4 3 4 5% 48%	3570
	21st to end	Day	17% 8% 3 5% 4 4 4 3 5% 5% 42%	3960
February	1st to 10th	Day	19% 8% 3 5% 5% 4 5% 4 5% 6% 36%	1889
	11th to 20th	Day	15% 7% 3 6% 6% 4 4 3 5% 6% 41%	1948
	21st to end	Day	18% 10% 2 8% 4 4 4 4 4 6% 38%	1650
March	1st to 10th	Day	21% 13% 2 5% 4 3 3 3 5% 6% 35%	4476
	11th to 20th	Day	15% 9% 3 7% 4 4 4 3 5% 6% 40%	4788
	21st to end	Day	25% 10% 2 6% 4 4 4 3 5% 5% 31%	5740
April	1st to 10th	Day	20% 10% 3 6% 4 4 3 3 5% 6% 37%	2400
	11th to 20th	Day	19% 7% 2 5% 5% 4 4 4 6% 7% 39%	2389
	21st to end	Day	21% 6% 2 6% 5% 4 4 3 5% 5% 38%	2600
May	1st to 10th	Day	25% 12% 3 7% 4 4 4 3 4 6% 28%	4236
	11th to 20th	Day	23% 10% 3 7% 4 3 3 3 4 6% 33%	4108
	21st to end	Day	16% 5% 2 5% 4 3 4 3 6% 8% 45%	4837
June	1st to 10th	Day	19% 7% 2 6% 5% 4 4 4 7% 7% 35%	2660
	11th to 20th	Day	16% 6% 2 6% 4 4 5% 5% 6% 8% 37%	2660
	21st to end	Day	16% 6% 2 7% 6% 5% 5% 4 5% 9% 36%	2660
July	1st to 10th	Day	14% 7% 2 6% 6% 5% 6% 4 7% 8% 34%	4440
	11th to 20th	Day	12% 6% 3 6% 4 5% 5% 4 7% 9% 38%	4440
	21st to end	Day	18% 7% 2 7% 5% 4 5% 4 6% 7% 34%	4814
August	1st to 10th	Day	17% 7% 3 7% 6% 5% 5% 5% 6% 9% 31%	4115
	11th to 20th	Day	13% 7% 2 8% 5% 5% 5% 4 6% 7% 38%	3991
	21st to end	Day	8% 4 2 5% 4 5% 5% 5% 7% 9% 47%	4180
September	1st to 10th	Day	14% 6% 2 6% 4 4 4 3 6% 6% 47%	2269
	11th to 20th	Day	15% 5% 2 5% 3 3 4 2 4 6% 51%	2090
	21st to end	Day	19% 6% 2 5% 4 3 4 3 5% 6% 43%	2090
October	1st to 10th	Day	24% 7% 2 5% 3 3 3 3 3 5% 42%	2090
	11th to 20th	Day	15% 6% 2 4 3 3 4 3 5% 6% 48%	1866
	21st to end	Day	19% 7% 2 4 4 4 4 3 5% 6% 42%	1881
November	1st to 10th	Day	16% 7% 2 4 4 4 3 2 4 4 51%	1761
	11th to 20th	Day	18% 8% 1 3 3 3 3 3 5% 5% 47%	1800
	21st to end	Day	18% 6% 2 5% 4 4 4 3 5% 6% 44%	1800
December	1st to 10th	Day	15% 9% 2 5% 3 4 3 2 4 5% 48%	2699
	11th to 20th	Day	20% 7% 2 4 3 3 3 2 4 5% 48%	2986
	21st to end	Day	21% 11% 3 6% 4 3 4 3 4 5% 38%	3960
January	1st to 10th	Night	14% 7% 2 4 3 3 3 3 5% 7% 50%	6349
	11th to 20th	Night	14% 10% 4 8% 5% 4 3 3 4 5% 41%	6315
	21st to end	Night	16% 11% 3 7% 5% 4 4 3 4 5% 39%	6996
February	1st to 10th	Night	17% 9% 3 7% 4 4 4 4 5% 5% 39%	2509
	11th to 20th	Night	16% 9% 3 6% 5% 4 4 3 5% 6% 39%	2338
	21st to end	Night	18% 8% 2 7% 3 4 4 2 5% 5% 41%	1980
March	1st to 10th	Night	24% 9% 2 5% 4 4 3 3 4 5% 38%	5364
	11th to 20th	Night	16% 10% 3 7% 4 4 4 3 5% 6% 39%	5169
	21st to end	Night	25% 10% 2 6% 4 4 4 4 4 4 33%	5174
April	1st to 10th	Night	19% 9% 3 6% 5% 5% 4 3 5% 6% 36%	2000
	11th to 20th	Night	20% 8% 2 6% 5% 4 4 3 5% 6% 38%	1960
	21st to end	Night	20% 7% 3 6% 5% 4 3 2 5% 5% 40%	1800
May	1st to 10th	Night	25% 10% 3 8% 4 4 4 3 5% 7% 27%	2924
	11th to 20th	Night	22% 10% 3 7% 5% 5% 4 5% 5% 6% 26%	2820
	21st to end	Night	17% 6% 2 6% 4 4 3 3 6% 8% 40%	2739
June	1st to 10th	Night	16% 9% 3 5% 5% 5% 4 4 5% 7% 37%	1520
	11th to 20th	Night	19% 7% 2 6% 4 4 4 4 4 8% 37%	1520
	21st to end	Night	17% 6% 2 5% 4 4 5% 4 4 9% 40%	1520
July	1st to 10th	Night	13% 7% 2 6% 5% 4 5% 4 7% 11% 34%	2520
	11th to 20th	Night	13% 7% 3 6% 5% 4 4 4 6% 9% 38%	2520
	21st to end	Night	17% 8% 3 8% 5% 5% 5% 4 5% 6% 33%	2739
August	1st to 10th	Night	20% 7% 2 7% 5% 5% 4 5% 6% 7% 31%	2781
	11th to 20th	Night	10% 8% 3 8% 5% 5% 7% 5% 6% 7% 37%	2833
	21st to end	Night	8% 4 1 5% 3 4 3 3 5% 8% 56%	3476
September	1st to 10th	Night	12% 6% 3 6% 5% 4 4 3 6% 5% 45%	1910
	11th to 20th	Night	15% 6% 2 4 3 2 3 3 3 6% 53%	2090
	21st to end	Night	18% 6% 3 6% 3 3 4 4 4 6% 42%	2090
October	1st to 10th	Night	20% 7% 3 6% 4 4 3 2 4 6% 42%	2090
	11th to 20th	Night	16% 5% 2 5% 4 4 4 2 5% 6% 48%	2311
	21st to end	Night	21% 7% 3 6% 4 3 4 3 4 6% 39%	2717
November	1st to 10th	Night	14% 5% 2 5% 4 4 4 3 4 5% 49%	2537
	11th to 20th	Night	18% 7% 2 5% 4 3 3 3 5% 5% 46%	2600
	21st to end	Night	16% 7% 2 5% 4 3 4 4 4 7% 45%	2600
December	1st to 10th	Night	18% 8% 2 4 4 3 3 3 4 4 45%	4476
	11th to 20th	Night	22% 9% 2 5% 4 2 3 3 4 5% 41%	5208
	21st to end	Night	18% 11% 3 6% 4 3 3 2 4 6% 40%	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	39% 3 7% 28% 20% 3	3598
	11th to 20th	Day	40% 4 10% 22% 18% 6%	3600
	21st to end	Day	45% 4 10% 20% 18% 3	3960
February	1st to 10th	Day	47% 6% 13% 17% 14% 3	1889
	11th to 20th	Day	44% 4 12% 22% 15% 3	1957
	21st to end	Day	48% 4 11% 19% 15% 3	1650
March	1st to 10th	Day	51% 3 11% 14% 11% 10%	4479
	11th to 20th	Day	43% 6% 13% 26% 10% 2	4788
	21st to end	Day	55% 3 6% 15% 14% 7%	5740
April	1st to 10th	Day	48% 4 11% 17% 16% 4	2400
	11th to 20th	Day	43% 6% 10% 20% 17% 3	2389
	21st to end	Day	46% 5% 9% 20% 17% 4	2600
May	1st to 10th	Day	57% 6% 12% 14% 10% 1	4250
	11th to 20th	Day	53% 7% 13% 15% 10% 2	4112
	21st to end	Day	37% 7% 11% 24% 19% 2	4837
June	1st to 10th	Day	46% 6% 13% 22% 12% 1	2660
	11th to 20th	Day	43% 8% 13% 20% 15% 2	2660
	21st to end	Day	44% 8% 14% 21% 13% 1	2660
July	1st to 10th	Day	44% 9% 11% 20% 14% 2	4370
	11th to 20th	Day	41% 7% 15% 23% 13% 2	4365
	21st to end	Day	48% 7% 11% 20% 12% 2	4661
August	1st to 10th	Day	49% 8% 15% 20% 8% 1	4101
	11th to 20th	Day	43% 7% 13% 27% 10%	4030
	21st to end	Day	31% 7% 13% 29% 19% 1	4180
September	1st to 10th	Day	38% 6% 10% 23% 21% 2	2269
	11th to 20th	Day	35% 5% 9% 26% 23% 3	2090
	21st to end	Day	42% 4 8% 20% 23% 2	2090
October	1st to 10th	Day	40% 4 9% 25% 19% 4	3480
	11th to 20th	Day	32% 3 7% 28% 27% 4	3069
	21st to end	Day	32% 4 12% 29% 20% 3	3081
November	1st to 10th	Day	39% 3 13% 24% 18% 2	1761
	11th to 20th	Day	39% 4 9% 22% 22% 3	1800
	21st to end	Day	42% 6% 12% 26% 12% 2	1800
December	1st to 10th	Day	39% 4 13% 28% 14% 1	2699
	11th to 20th	Day	41% 3 14% 16% 20% 6%	2986
	21st to end	Day	50% 4 8% 20% 14% 4	3960
January	1st to 10th	Night	34% 3 9% 34% 17% 2	6349
	11th to 20th	Night	46% 4 12% 21% 14% 4	6360
	21st to end	Night	49% 4 9% 16% 17% 4	6996
February	1st to 10th	Night	46% 4 13% 21% 14% 2	2509
	11th to 20th	Night	46% 5% 9% 19% 16% 4	2340
	21st to end	Night	45% 4 9% 23% 16% 4	1980
March	1st to 10th	Night	50% 4 9% 16% 15% 7%	5374
	11th to 20th	Night	46% 6% 16% 18% 12% 2	5170
	21st to end	Night	55% 3 5% 11% 19% 6%	5174
April	1st to 10th	Night	48% 5% 9% 19% 15% 4	2000
	11th to 20th	Night	47% 5% 9% 19% 17% 3	1960
	21st to end	Night	46% 6% 9% 19% 16% 4	1800
May	1st to 10th	Night	55% 8% 13% 15% 7% 2	2930
	11th to 20th	Night	56% 9% 13% 13% 7% 2	2821
	21st to end	Night	42% 8% 15% 21% 13% 1	2740
June	1st to 10th	Night	45% 8% 13% 21% 12% 1	1520
	11th to 20th	Night	46% 6% 12% 22% 14% 1	1520
	21st to end	Night	41% 8% 15% 23% 13% 1	1520
July	1st to 10th	Night	43% 8% 12% 21% 15%	2480
	11th to 20th	Night	41% 7% 16% 23% 12% 1	2472
	21st to end	Night	49% 7% 11% 17% 14% 1	2651
August	1st to 10th	Night	53% 7% 13% 18% 9% 1	2771
	11th to 20th	Night	43% 9% 13% 25% 9%	2860
	21st to end	Night	27% 6% 15% 28% 23% 1	3476
September	1st to 10th	Night	39% 7% 11% 23% 19% 1	1910
	11th to 20th	Night	34% 6% 10% 22% 26% 2	2090
	21st to end	Night	43% 6% 8% 22% 20% 2	2090
October	1st to 10th	Night	40% 5% 12% 25% 15% 2	3480
	11th to 20th	Night	27% 3 9% 27% 30% 3	3834
	21st to end	Night	34% 4 11% 29% 20% 2	4467
November	1st to 10th	Night	37% 5% 12% 23% 19% 4	2537
	11th to 20th	Night	41% 3 9% 22% 21% 3	2600
	21st to end	Night	39% 5% 13% 26% 14% 2	2600
December	1st to 10th	Night	43% 3 12% 28% 14% 1	4476
	11th to 20th	Night	47% 3 15% 13% 20% 2	5208
	21st to end	Night	46% 4 8% 22% 17% 2	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	32% 24% 29% 13% 3	200
	11th to 20th	Day	32% 25% 34% 8% 2 1	200
	21st to end	Day	26% 28% 34% 9% 2	220
February	1st to 10th	Day	31% 22% 35% 11% 1	427
	11th to 20th	Day	31% 31% 30% 7% 1	496
	21st to end	Day	29% 24% 34% 11% 3	414
March	1st to 10th	Day	33% 24% 29% 11% 3	500
	11th to 20th	Day	29% 27% 30% 10% 4 1	500
	21st to end	Day	31% 25% 28% 10% 5% 1	550
April	1st to 10th	Day	34% 24% 25% 11% 5% 1	500
	11th to 20th	Day	30% 27% 28% 11% 3	492
	21st to end	Day	28% 18% 37% 12% 3 1	500
May	1st to 10th	Day	36% 21% 29% 11% 2 1	503
	11th to 20th	Day	23% 20% 38% 14% 5% 1	487
	21st to end	Day	19% 15% 36% 23% 5% 1	529
June	1st to 10th	Day	21% 16% 36% 20% 6% 1	490
	11th to 20th	Day	17% 17% 40% 19% 7% 1	490
	21st to end	Day	16% 15% 40% 20% 8% 1	490
July	1st to 10th	Day	18% 11% 34% 25% 11% 2	485
	11th to 20th	Day	16% 7% 36% 30% 10% 2	484
	21st to end	Day	12% 11% 39% 28% 9% 1	532
August	1st to 10th	Day	14% 11% 33% 32% 9% 2	486
	11th to 20th	Day	15% 10% 34% 25% 14% 2	479
	21st to end	Day	13% 10% 35% 25% 13% 4	539
September	1st to 10th	Day	18% 12% 29% 26% 11% 4	490
	11th to 20th	Day	19% 14% 27% 19% 14% 7%	490
	21st to end	Day	23% 12% 33% 19% 9% 4	490
October	1st to 10th	Day	28% 12% 26% 21% 8% 5%	490
	11th to 20th	Day	19% 17% 34% 18% 9% 2	433
	21st to end	Day	26% 18% 31% 17% 7% 2	429
November	1st to 10th	Day	24% 17% 32% 15% 11% 1	395
	11th to 20th	Day	28% 21% 33% 15% 4	400
	21st to end	Day	30% 19% 31% 14% 6% 1	400
December	1st to 10th	Day	25% 26% 33% 12% 4	260
	11th to 20th	Day	34% 26% 31% 8% 2 1	200
	21st to end	Day	27% 23% 33% 12% 3 2	220
January	1st to 10th	Night	23% 23% 37% 15% 2	800
	11th to 20th	Night	28% 21% 33% 16% 2	800
	21st to end	Night	21% 21% 36% 18% 3	880
February	1st to 10th	Night	25% 20% 36% 17% 1	800
	11th to 20th	Night	27% 24% 37% 12% 1	783
	21st to end	Night	25% 23% 33% 15% 3	660
March	1st to 10th	Night	26% 20% 34% 16% 4	800
	11th to 20th	Night	21% 25% 35% 16% 4	800
	21st to end	Night	26% 21% 33% 17% 4	880
April	1st to 10th	Night	25% 22% 33% 17% 3	800
	11th to 20th	Night	26% 20% 35% 16% 4	776
	21st to end	Night	25% 19% 36% 19% 2	600
May	1st to 10th	Night	30% 16% 33% 17% 4	600
	11th to 20th	Night	22% 18% 38% 20% 3	565
	21st to end	Night	19% 8% 42% 25% 5%	412
June	1st to 10th	Night	18% 9% 36% 28% 8% 1	380
	11th to 20th	Night	20% 8% 39% 27% 6%	380
	21st to end	Night	18% 7% 39% 31% 5%	380
July	1st to 10th	Night	13% 4 38% 37% 8%	370
	11th to 20th	Night	15% 6% 31% 39% 9% 1	368
	21st to end	Night	14% 5% 33% 39% 9%	416
August	1st to 10th	Night	13% 6% 39% 34% 8%	536
	11th to 20th	Night	13% 6% 31% 40% 9% 1	587
	21st to end	Night	14% 6% 25% 38% 15% 2	836
September	1st to 10th	Night	15% 6% 36% 33% 11%	760
	11th to 20th	Night	18% 8% 28% 28% 16% 2	760
	21st to end	Night	22% 8% 27% 29% 11% 2	760
October	1st to 10th	Night	25% 10% 27% 25% 12% 2	760
	11th to 20th	Night	19% 12% 34% 22% 11% 1	760
	21st to end	Night	25% 15% 33% 19% 7% 1	836
November	1st to 10th	Night	19% 15% 34% 23% 8% 1	780
	11th to 20th	Night	24% 21% 31% 18% 7%	800
	21st to end	Night	23% 21% 33% 17% 5% 1	800
December	1st to 10th	Night	26% 19% 34% 17% 4	800
	11th to 20th	Night	26% 20% 32% 20% 2	800
	21st to end	Night	26% 19% 35% 18% 2	880

Page generated at 2025-05-08 09:33:59. Version ac07

Copyright © 2025 Attilla Danko.