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 2026-09-14.

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% 7% 2 6% 4 4 4 3 5% 7% 39%	148658
	Night	17% 8% 2 6% 4 4 4 3 5% 6% 40%	142435
Transparency	Day	44% 5% 11% 22% 15% 2	152193
	Night	44% 5% 11% 22% 16% 2	146976
Seeing	Day	24% 18% 33% 17% 6% 1	17480
	Night	22% 16% 34% 22% 6%	26298

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% 9% 3 7% 4 4 4 3 5% 6% 43%	4661
	11th to 20th	Day	15% 9% 3 5% 3 3 3 2 4 5% 47%	4650
	21st to end	Day	15% 8% 3 4 3 3 4 3 5% 6% 46%	5124
February	1st to 10th	Day	18% 8% 3 6% 5% 4 5% 4 5% 6% 37%	1983
	11th to 20th	Day	15% 7% 3 6% 6% 4 4 3 5% 6% 41%	2048
	21st to end	Day	17% 10% 2 8% 4 3 4 3 4 5% 38%	1730
March	1st to 10th	Day	21% 13% 2 5% 4 3 3 3 4 5% 35%	4576
	11th to 20th	Day	15% 9% 3 7% 4 4 4 4 5% 6% 39%	4894
	21st to end	Day	25% 10% 2 6% 4 4 4 3 5% 5% 31%	5867
April	1st to 10th	Day	21% 9% 3 6% 4 3 3 3 5% 6% 38%	2520
	11th to 20th	Day	18% 7% 2 5% 5% 4 4 4 6% 7% 39%	2510
	21st to end	Day	20% 6% 3 6% 5% 4 4 3 5% 5% 38%	2730
May	1st to 10th	Day	25% 10% 3 7% 4 4 4 4 4 7% 29%	7639
	11th to 20th	Day	19% 9% 3 7% 4 4 3 3 4 6% 36%	7680
	21st to end	Day	22% 7% 2 7% 4 4 4 4 6% 7% 31%	9060
June	1st to 10th	Day	19% 6% 2 6% 5% 4 4 4 7% 8% 36%	2940
	11th to 20th	Day	16% 6% 2 6% 4 4 5% 5% 6% 9% 37%	2940
	21st to end	Day	16% 6% 2 6% 5% 4 5% 4 5% 8% 37%	2940
July	1st to 10th	Day	19% 6% 2 5% 4 5% 5% 4 6% 9% 34%	8280
	11th to 20th	Day	9% 5% 2 6% 4 4 5% 4 7% 10% 43%	8280
	21st to end	Day	16% 6% 2 6% 4 4 4 3 5% 7% 43%	8993
August	1st to 10th	Day	14% 6% 3 7% 5% 5% 5% 5% 7% 10% 32%	6039
	11th to 20th	Day	13% 6% 2 7% 4 4 5% 4 6% 8% 42%	5883
	21st to end	Day	12% 4 2 5% 4 5% 5% 4 7% 9% 45%	6080
September	1st to 10th	Day	13% 6% 2 6% 4 4 4 3 6% 6% 46%	2507
	11th to 20th	Day	15% 5% 2 5% 3 3 4 2 4 6% 51%	2233
	21st to end	Day	19% 6% 2 5% 4 3 4 3 5% 6% 43%	2200
October	1st to 10th	Day	23% 6% 2 5% 3 3 3 3 3 5% 44%	2200
	11th to 20th	Day	16% 6% 2 4 3 3 4 3 5% 6% 47%	1964
	21st to end	Day	19% 7% 2 4 4 4 4 3 5% 6% 42%	1980
November	1st to 10th	Day	16% 7% 2 4 4 4 3 2 4 4 50%	1851
	11th to 20th	Day	17% 8% 1 3 3 4 3 3 5% 5% 47%	1890
	21st to end	Day	18% 6% 2 6% 3 4 4 3 5% 6% 43%	1890
December	1st to 10th	Day	15% 9% 2 5% 3 3 3 2 4 5% 49%	2782
	11th to 20th	Day	20% 7% 2 4 3 3 3 2 4 5% 49%	3066
	21st to end	Day	21% 11% 3 6% 4 3 4 3 4 5% 37%	4048
January	1st to 10th	Night	15% 7% 2 5% 3 3 3 3 4 6% 48%	8234
	11th to 20th	Night	16% 10% 4 8% 5% 4 3 3 4 5% 39%	8235
	21st to end	Night	15% 10% 3 7% 5% 5% 4 3 4 5% 42%	9057
February	1st to 10th	Night	16% 9% 3 6% 4 4 4 4 5% 6% 39%	2634
	11th to 20th	Night	16% 9% 3 6% 5% 4 4 3 5% 6% 39%	2458
	21st to end	Night	18% 8% 2 7% 3 3 4 2 5% 5% 41%	2076
March	1st to 10th	Night	24% 9% 2 4 4 3 3 3 4 5% 38%	5484
	11th to 20th	Night	16% 10% 3 7% 4 4 4 3 5% 6% 39%	5283
	21st to end	Night	25% 10% 2 6% 4 4 4 4 4 4 33%	5289
April	1st to 10th	Night	19% 8% 3 6% 5% 4 4 3 5% 5% 37%	2100
	11th to 20th	Night	19% 9% 2 6% 5% 4 4 3 5% 6% 38%	2059
	21st to end	Night	20% 8% 3 6% 5% 4 3 2 5% 5% 40%	1890
May	1st to 10th	Night	28% 9% 3 7% 3 3 3 3 5% 6% 30%	5259
	11th to 20th	Night	18% 8% 3 7% 5% 5% 5% 4 6% 6% 32%	5235
	21st to end	Night	22% 8% 3 8% 5% 5% 4 3 5% 7% 30%	5115
June	1st to 10th	Night	15% 9% 3 6% 5% 5% 4 5% 5% 7% 38%	1680
	11th to 20th	Night	18% 7% 2 6% 4 4 4 4 5% 8% 37%	1680
	21st to end	Night	16% 6% 2 5% 4 4 5% 4 4 9% 41%	1680
July	1st to 10th	Night	17% 7% 2 6% 4 4 4 4 7% 10% 35%	4680
	11th to 20th	Night	11% 6% 2 6% 4 4 4 4 6% 9% 44%	4680
	21st to end	Night	15% 6% 2 6% 4 4 4 3 5% 7% 43%	5084
August	1st to 10th	Night	16% 6% 2 7% 5% 6% 5% 5% 6% 8% 33%	4062
	11th to 20th	Night	11% 7% 3 7% 5% 5% 6% 4 6% 8% 39%	4159
	21st to end	Night	12% 5% 2 5% 4 4 4 4 5% 8% 48%	5045
September	1st to 10th	Night	11% 6% 3 7% 5% 4 4 3 6% 5% 45%	2112
	11th to 20th	Night	14% 6% 2 4 3 2 3 3 4 6% 53%	2234
	21st to end	Night	19% 7% 3 6% 3 3 4 4 4 6% 42%	2200
October	1st to 10th	Night	20% 7% 2 5% 4 4 3 2 4 6% 44%	2200
	11th to 20th	Night	16% 5% 2 5% 4 4 4 2 5% 7% 47%	2433
	21st to end	Night	21% 7% 3 6% 4 3 4 3 4 6% 40%	2860
November	1st to 10th	Night	14% 5% 2 5% 4 4 4 3 5% 5% 49%	2667
	11th to 20th	Night	17% 7% 2 5% 4 3 3 3 5% 5% 47%	2730
	21st to end	Night	16% 7% 2 5% 4 3 4 4 4 7% 45%	2730
December	1st to 10th	Night	18% 8% 2 4 4 3 3 3 4 4 45%	4613
	11th to 20th	Night	22% 9% 2 5% 4 2 3 3 4 4 41%	5348
	21st to end	Night	17% 11% 3 6% 4 3 3 2 4 6% 40%	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	42% 3 9% 25% 18% 2	4662
	11th to 20th	Day	42% 4 9% 21% 18% 7%	4680
	21st to end	Day	40% 3 11% 23% 21% 2	5124
February	1st to 10th	Day	47% 5% 13% 17% 15% 3	1983
	11th to 20th	Day	44% 4 11% 23% 15% 3	2057
	21st to end	Day	48% 4 10% 20% 15% 3	1730
March	1st to 10th	Day	51% 3 11% 14% 11% 10%	4579
	11th to 20th	Day	43% 6% 13% 26% 10% 2	4894
	21st to end	Day	55% 3 6% 15% 13% 7%	5867
April	1st to 10th	Day	48% 4 10% 17% 17% 4	2520
	11th to 20th	Day	43% 6% 11% 20% 17% 3	2510
	21st to end	Day	46% 5% 8% 20% 17% 4	2730
May	1st to 10th	Day	56% 6% 12% 15% 10% 1	7651
	11th to 20th	Day	50% 5% 13% 19% 11% 1	7684
	21st to end	Day	51% 5% 10% 21% 12% 1	9061
June	1st to 10th	Day	45% 6% 12% 23% 13% 1	2940
	11th to 20th	Day	42% 8% 13% 21% 15% 2	2940
	21st to end	Day	43% 8% 14% 21% 14% 1	2940
July	1st to 10th	Day	45% 7% 13% 21% 12% 1	8210
	11th to 20th	Day	35% 6% 15% 28% 14% 1	8205
	21st to end	Day	41% 5% 10% 25% 18% 2	8795
August	1st to 10th	Day	46% 8% 16% 19% 9% 1	6025
	11th to 20th	Day	40% 6% 13% 32% 9%	5922
	21st to end	Day	35% 6% 13% 28% 16% 2	6080
September	1st to 10th	Day	38% 6% 10% 24% 20% 2	2507
	11th to 20th	Day	35% 5% 9% 26% 23% 3	2233
	21st to end	Day	42% 5% 8% 20% 22% 2	2200
October	1st to 10th	Day	39% 4 9% 25% 19% 4	3590
	11th to 20th	Day	32% 3 7% 28% 26% 4	3167
	21st to end	Day	32% 4 12% 29% 20% 3	3180
November	1st to 10th	Day	39% 3 13% 24% 19% 2	1851
	11th to 20th	Day	39% 4 9% 23% 22% 3	1890
	21st to end	Day	42% 6% 11% 26% 12% 2	1890
December	1st to 10th	Day	39% 4 13% 28% 15% 1	2782
	11th to 20th	Day	40% 3 14% 16% 20% 6%	3066
	21st to end	Day	50% 4 8% 20% 14% 4	4048
January	1st to 10th	Night	38% 3 10% 31% 16% 2	8234
	11th to 20th	Night	48% 4 10% 19% 15% 5%	8280
	21st to end	Night	47% 4 7% 18% 20% 4	9057
February	1st to 10th	Night	46% 4 13% 21% 15% 2	2634
	11th to 20th	Night	46% 5% 9% 20% 16% 4	2460
	21st to end	Night	45% 4 8% 23% 15% 4	2076
March	1st to 10th	Night	49% 4 9% 16% 16% 7%	5494
	11th to 20th	Night	46% 6% 16% 18% 12% 2	5284
	21st to end	Night	55% 3 5% 11% 19% 6%	5289
April	1st to 10th	Night	48% 5% 9% 19% 15% 3	2100
	11th to 20th	Night	47% 5% 10% 19% 17% 3	2059
	21st to end	Night	46% 6% 9% 19% 16% 4	1890
May	1st to 10th	Night	55% 5% 13% 14% 11% 2	5265
	11th to 20th	Night	50% 7% 14% 18% 9% 2	5236
	21st to end	Night	53% 6% 12% 20% 8%	5116
June	1st to 10th	Night	44% 8% 12% 23% 13% 1	1680
	11th to 20th	Night	46% 6% 12% 22% 13% 1	1680
	21st to end	Night	41% 8% 14% 24% 13% 1	1680
July	1st to 10th	Night	45% 6% 13% 21% 14%	4640
	11th to 20th	Night	37% 6% 15% 25% 15% 1	4632
	21st to end	Night	41% 5% 10% 26% 17% 1	4967
August	1st to 10th	Night	48% 7% 16% 17% 11% 1	4052
	11th to 20th	Night	41% 8% 15% 27% 9%	4186
	21st to end	Night	34% 6% 15% 27% 17% 1	5045
September	1st to 10th	Night	39% 7% 11% 24% 18% 1	2112
	11th to 20th	Night	33% 6% 10% 23% 26% 2	2234
	21st to end	Night	43% 6% 8% 22% 19% 2	2200
October	1st to 10th	Night	39% 5% 12% 25% 16% 3	3590
	11th to 20th	Night	27% 3 10% 27% 30% 3	3956
	21st to end	Night	34% 4 11% 29% 20% 2	4610
November	1st to 10th	Night	37% 5% 11% 24% 19% 3	2667
	11th to 20th	Night	40% 3 9% 23% 21% 3	2730
	21st to end	Night	39% 5% 13% 27% 13% 2	2730
December	1st to 10th	Night	43% 3 12% 28% 14% 1	4613
	11th to 20th	Night	47% 3 15% 14% 20% 2	5348
	21st to end	Night	46% 4 8% 22% 17% 2	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	31% 24% 29% 13% 3	220
	11th to 20th	Day	34% 24% 33% 7% 1	220
	21st to end	Day	27% 29% 33% 8% 2	242
February	1st to 10th	Day	30% 21% 35% 11% 2	461
	11th to 20th	Day	30% 30% 31% 9% 1	536
	21st to end	Day	28% 24% 34% 11% 3	446
March	1st to 10th	Day	32% 23% 30% 12% 3	540
	11th to 20th	Day	30% 26% 30% 9% 4 1	540
	21st to end	Day	32% 26% 28% 9% 4 1	594
April	1st to 10th	Day	35% 24% 26% 10% 4 1	540
	11th to 20th	Day	31% 27% 28% 11% 3	532
	21st to end	Day	28% 18% 37% 12% 3 1	540
May	1st to 10th	Day	35% 22% 30% 10% 2 1	543
	11th to 20th	Day	24% 19% 39% 13% 4 1	567
	21st to end	Day	21% 17% 35% 22% 5% 1	617
June	1st to 10th	Day	20% 16% 36% 21% 6% 1	570
	11th to 20th	Day	18% 18% 39% 18% 6% 1	570
	21st to end	Day	16% 14% 40% 20% 8% 1	570
July	1st to 10th	Day	19% 11% 35% 25% 10% 2	565
	11th to 20th	Day	15% 9% 36% 28% 10% 2	564
	21st to end	Day	13% 10% 39% 27% 9% 2	620
August	1st to 10th	Day	13% 11% 33% 32% 10% 2	566
	11th to 20th	Day	14% 10% 34% 26% 14% 2	559
	21st to end	Day	13% 11% 37% 23% 12% 4	627
September	1st to 10th	Day	18% 12% 31% 25% 10% 4	570
	11th to 20th	Day	18% 13% 28% 21% 14% 7%	542
	21st to end	Day	23% 12% 34% 19% 8% 4	530
October	1st to 10th	Day	27% 12% 26% 21% 9% 5%	530
	11th to 20th	Day	21% 16% 33% 18% 9% 2	467
	21st to end	Day	27% 17% 31% 16% 6% 2	462
November	1st to 10th	Day	26% 17% 31% 14% 10% 1	425
	11th to 20th	Day	27% 21% 33% 14% 4	430
	21st to end	Day	30% 21% 30% 13% 6%	430
December	1st to 10th	Day	27% 26% 31% 12% 4	283
	11th to 20th	Day	35% 25% 31% 7% 2	220
	21st to end	Day	30% 23% 32% 11% 2 2	242
January	1st to 10th	Night	23% 23% 37% 15% 2	840
	11th to 20th	Night	29% 21% 33% 15% 2	840
	21st to end	Night	22% 21% 36% 17% 3	924
February	1st to 10th	Night	24% 20% 37% 18% 2	840
	11th to 20th	Night	26% 23% 36% 13% 1	823
	21st to end	Night	25% 23% 33% 15% 3	692
March	1st to 10th	Night	26% 20% 35% 16% 3	840
	11th to 20th	Night	21% 25% 34% 15% 4	840
	21st to end	Night	27% 21% 33% 16% 3	924
April	1st to 10th	Night	26% 22% 32% 17% 3	840
	11th to 20th	Night	25% 20% 36% 16% 4	815
	21st to end	Night	25% 19% 36% 18% 2	630
May	1st to 10th	Night	30% 16% 33% 17% 4	630
	11th to 20th	Night	21% 18% 39% 20% 3	622
	21st to end	Night	21% 9% 41% 25% 5%	456
June	1st to 10th	Night	17% 9% 37% 29% 7%	420
	11th to 20th	Night	20% 8% 40% 26% 5%	420
	21st to end	Night	18% 6% 38% 33% 5%	420
July	1st to 10th	Night	14% 4 39% 36% 7%	410
	11th to 20th	Night	14% 6% 31% 38% 9%	408
	21st to end	Night	13% 5% 34% 38% 9%	460
August	1st to 10th	Night	12% 6% 39% 35% 7%	593
	11th to 20th	Night	12% 6% 33% 39% 9% 1	650
	21st to end	Night	14% 7% 27% 37% 14% 2	924
September	1st to 10th	Night	14% 6% 35% 33% 11%	840
	11th to 20th	Night	17% 8% 28% 29% 16% 2	813
	21st to end	Night	22% 8% 27% 30% 11% 2	800
October	1st to 10th	Night	24% 10% 28% 26% 12% 2	800
	11th to 20th	Night	20% 12% 34% 23% 10% 1	800
	21st to end	Night	25% 15% 33% 20% 6% 1	880
November	1st to 10th	Night	20% 15% 33% 23% 8% 1	820
	11th to 20th	Night	23% 21% 31% 18% 6%	840
	21st to end	Night	23% 21% 33% 18% 5% 1	840
December	1st to 10th	Night	26% 19% 34% 17% 4	840
	11th to 20th	Night	26% 21% 32% 19% 2	840
	21st to end	Night	27% 19% 35% 17% 2	924

Page generated at 2026-09-11 04:11:54. Version ac07

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