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 2024-03-01.

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	18% 7% 3 5% 5% 3 4 4 5% 7% 40%	78351
	Night	17% 8% 3 5% 5% 3 4 4 5% 6% 40%	81049
Transparency	Day	44% 6% 11% 22% 15% 3	78056
	Night	45% 5% 11% 22% 15% 2	80878
Seeing	Day	24% 18% 33% 17% 7% 2	14118
	Night	22% 16% 34% 22% 6% 1	23176

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	15% 9% 3 5% 4 2 4 3 3 5% 46%	2517
	11th to 20th	Day	17% 9% 3 5% 4 3 5% 4 5% 5% 40%	2520
	21st to end	Day	21% 11% 4 5% 5% 3 4 4 4 6% 34%	2772
February	1st to 10th	Day	20% 7% 3 4 5% 3 5% 5% 5% 6% 36%	1793
	11th to 20th	Day	15% 7% 3 5% 7% 3 4 4 4 6% 41%	1848
	21st to end	Day	19% 9% 3 7% 5% 3 4 4 4 6% 38%	1570
March	1st to 10th	Day	17% 9% 3 4 4 3 4 4 6% 7% 39%	1797
	11th to 20th	Day	17% 6% 3 6% 4 2 5% 4 5% 7% 39%	1900
	21st to end	Day	19% 8% 3 6% 5% 2 3 3 4 5% 40%	2286
April	1st to 10th	Day	20% 8% 3 6% 5% 3 3 4 5% 6% 39%	2160
	11th to 20th	Day	18% 6% 2 4 5% 3 5% 5% 6% 7% 39%	2147
	21st to end	Day	22% 6% 2 5% 6% 3 4 4 6% 5% 36%	2340
May	1st to 10th	Day	25% 9% 3 5% 4 3 4 4 4 7% 32%	2340
	11th to 20th	Day	18% 7% 3 5% 5% 3 4 4 4 7% 41%	2314
	21st to end	Day	16% 5% 2 5% 5% 3 4 4 5% 7% 44%	2725
June	1st to 10th	Day	20% 6% 3 5% 6% 3 5% 4 6% 8% 34%	2520
	11th to 20th	Day	17% 6% 3 5% 5% 3 5% 6% 6% 8% 37%	2520
	21st to end	Day	16% 6% 2 5% 7% 3 6% 5% 5% 9% 36%	2520
July	1st to 10th	Day	14% 5% 2 5% 6% 3 6% 5% 6% 7% 40%	2520
	11th to 20th	Day	14% 5% 3 5% 5% 3 5% 6% 7% 9% 38%	2520
	21st to end	Day	12% 5% 2 5% 7% 3 6% 6% 6% 8% 39%	2744
August	1st to 10th	Day	11% 6% 2 5% 6% 4 5% 7% 6% 10% 37%	2337
	11th to 20th	Day	14% 6% 2 6% 6% 4 6% 6% 6% 8% 39%	2278
	21st to end	Day	13% 5% 2 5% 4 3 5% 5% 6% 8% 44%	2376
September	1st to 10th	Day	14% 6% 2 5% 5% 3 4 4 5% 6% 46%	2150
	11th to 20th	Day	16% 5% 2 4 3 2 4 3 3 6% 52%	1980
	21st to end	Day	18% 5% 2 4 4 3 3 3 5% 7% 45%	1980
October	1st to 10th	Day	25% 6% 2 4 4 2 3 4 3 5% 42%	1980
	11th to 20th	Day	16% 6% 2 4 4 2 4 4 5% 6% 47%	1769
	21st to end	Day	20% 7% 3 4 4 3 4 4 5% 6% 40%	1782
November	1st to 10th	Day	17% 6% 3 4 4 2 3 2 4 4 50%	1671
	11th to 20th	Day	19% 7% 2 3 4 3 3 4 5% 6% 45%	1710
	21st to end	Day	18% 6% 2 5% 4 3 4 4 4 7% 44%	1710
December	1st to 10th	Day	19% 8% 3 5% 5% 3 5% 3 4 6% 39%	1577
	11th to 20th	Day	22% 7% 2 3 4 3 4 3 3 5% 45%	1906
	21st to end	Day	22% 10% 3 6% 5% 3 4 4 4 6% 34%	2772
January	1st to 10th	Night	17% 7% 2 5% 3 2 3 4 3 6% 48%	4429
	11th to 20th	Night	15% 10% 4 7% 6% 3 3 4 4 5% 40%	4440
	21st to end	Night	22% 13% 4 6% 6% 3 4 4 4 5% 30%	4884
February	1st to 10th	Night	17% 9% 3 6% 5% 3 4 4 5% 6% 39%	2385
	11th to 20th	Night	15% 8% 3 6% 5% 3 4 4 5% 6% 39%	2218
	21st to end	Night	19% 8% 2 6% 4 2 4 3 5% 5% 41%	1884
March	1st to 10th	Night	16% 7% 2 5% 5% 3 5% 4 5% 6% 42%	2157
	11th to 20th	Night	15% 9% 4 6% 5% 3 4 5% 4 6% 39%	2057
	21st to end	Night	18% 9% 2 6% 5% 2 4 3 4 5% 41%	2066
April	1st to 10th	Night	18% 8% 3 6% 5% 3 4 5% 5% 5% 38%	1800
	11th to 20th	Night	19% 7% 3 5% 5% 3 4 4 5% 6% 39%	1762
	21st to end	Night	22% 7% 3 5% 5% 3 4 3 4 6% 38%	1620
May	1st to 10th	Night	23% 9% 3 6% 4 3 4 4 5% 7% 31%	1620
	11th to 20th	Night	19% 6% 3 5% 6% 3 4 7% 5% 7% 36%	1593
	21st to end	Night	17% 6% 4 6% 5% 3 4 4 5% 8% 38%	1551
June	1st to 10th	Night	17% 8% 3 5% 5% 4 5% 5% 5% 7% 37%	1440
	11th to 20th	Night	20% 7% 3 5% 4 3 4 5% 5% 7% 37%	1440
	21st to end	Night	16% 6% 2 4 5% 3 5% 5% 4 9% 42%	1440
July	1st to 10th	Night	13% 6% 3 5% 5% 3 5% 5% 6% 10% 40%	1440
	11th to 20th	Night	13% 7% 3 5% 6% 3 5% 6% 7% 11% 35%	1440
	21st to end	Night	13% 5% 3 5% 6% 4 6% 5% 6% 8% 40%	1574
August	1st to 10th	Night	8% 5% 2 6% 7% 4 5% 6% 6% 9% 44%	1581
	11th to 20th	Night	10% 6% 3 6% 5% 3 7% 7% 6% 8% 39%	1619
	21st to end	Night	14% 5% 2 5% 4 3 3 4 5% 8% 47%	1980
September	1st to 10th	Night	12% 5% 3 6% 6% 4 5% 4 5% 6% 44%	1809
	11th to 20th	Night	14% 6% 2 3 4 2 2 4 3 6% 53%	1980
	21st to end	Night	17% 5% 3 5% 4 2 3 5% 4 6% 44%	1980
October	1st to 10th	Night	21% 6% 3 4 4 2 3 3 4 6% 42%	1980
	11th to 20th	Night	16% 5% 2 5% 5% 3 3 4 4 7% 46%	2189
	21st to end	Night	22% 7% 3 5% 5% 3 4 3 5% 6% 38%	2574
November	1st to 10th	Night	15% 5% 2 5% 4 3 4 3 4 5% 48%	2407
	11th to 20th	Night	18% 7% 2 4 4 2 3 3 5% 5% 45%	2470
	21st to end	Night	16% 6% 3 4 5% 2 4 5% 4 7% 45%	2470
December	1st to 10th	Night	20% 8% 3 5% 5% 2 4 5% 5% 5% 40%	2598
	11th to 20th	Night	20% 7% 2 5% 4 2 4 5% 5% 6% 41%	3288
	21st to end	Night	20% 11% 4 6% 5% 3 3 3 4 6% 35%	4884

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	41% 3 9% 31% 14% 2	2518
	11th to 20th	Day	46% 6% 9% 25% 12% 2	2520
	21st to end	Day	53% 4 10% 21% 10% 2	2772
February	1st to 10th	Day	48% 6% 13% 17% 14% 3	1793
	11th to 20th	Day	44% 4 12% 22% 15% 3	1857
	21st to end	Day	48% 4 11% 19% 14% 3	1570
March	1st to 10th	Day	44% 4 14% 21% 13% 5%	1800
	11th to 20th	Day	44% 5% 10% 22% 15% 4	1900
	21st to end	Day	47% 4 9% 17% 17% 6%	2286
April	1st to 10th	Day	47% 4 11% 18% 17% 4	2160
	11th to 20th	Day	42% 6% 10% 21% 17% 3	2147
	21st to end	Day	47% 5% 9% 19% 16% 4	2340
May	1st to 10th	Day	53% 5% 9% 18% 13% 2	2340
	11th to 20th	Day	44% 6% 11% 18% 18% 3	2318
	21st to end	Day	39% 7% 13% 24% 14% 2	2725
June	1st to 10th	Day	47% 6% 14% 21% 11% 1	2520
	11th to 20th	Day	44% 8% 12% 19% 15% 2	2520
	21st to end	Day	43% 8% 14% 22% 12% 1	2520
July	1st to 10th	Day	41% 8% 11% 24% 14% 3	2450
	11th to 20th	Day	40% 8% 13% 25% 12% 2	2445
	21st to end	Day	40% 9% 13% 22% 13% 4	2591
August	1st to 10th	Day	40% 9% 14% 22% 13% 1	2323
	11th to 20th	Day	42% 8% 13% 22% 14% 1	2278
	21st to end	Day	37% 8% 11% 23% 19% 2	2376
September	1st to 10th	Day	39% 7% 11% 23% 20% 2	2150
	11th to 20th	Day	35% 5% 9% 25% 23% 3	1980
	21st to end	Day	40% 5% 8% 21% 24% 2	1980
October	1st to 10th	Day	47% 4 10% 21% 14% 4	1980
	11th to 20th	Day	38% 5% 10% 28% 17% 2	1769
	21st to end	Day	45% 5% 14% 18% 15% 3	1782
November	1st to 10th	Day	40% 3 13% 24% 18% 2	1671
	11th to 20th	Day	41% 4 10% 23% 20% 3	1710
	21st to end	Day	42% 6% 12% 26% 12% 2	1710
December	1st to 10th	Day	47% 5% 13% 16% 18% 2	1577
	11th to 20th	Day	44% 4 13% 16% 17% 6%	1906
	21st to end	Day	52% 5% 10% 21% 11% 1	2772
January	1st to 10th	Night	39% 4 11% 31% 12% 3	4429
	11th to 20th	Night	47% 5% 12% 22% 11% 3	4440
	21st to end	Night	58% 5% 9% 16% 11% 2	4884
February	1st to 10th	Night	46% 5% 13% 20% 14% 2	2385
	11th to 20th	Night	46% 5% 10% 19% 16% 4	2220
	21st to end	Night	45% 4 8% 23% 15% 4	1884
March	1st to 10th	Night	44% 5% 9% 22% 15% 5%	2167
	11th to 20th	Night	46% 6% 10% 16% 18% 4	2058
	21st to end	Night	47% 4 8% 17% 18% 6%	2066
April	1st to 10th	Night	47% 5% 10% 19% 16% 3	1800
	11th to 20th	Night	45% 5% 10% 20% 17% 3	1762
	21st to end	Night	47% 6% 10% 19% 14% 4	1620
May	1st to 10th	Night	53% 6% 10% 16% 12% 4	1620
	11th to 20th	Night	46% 7% 13% 18% 13% 4	1594
	21st to end	Night	45% 8% 15% 19% 12% 1	1552
June	1st to 10th	Night	46% 8% 13% 21% 12% 1	1440
	11th to 20th	Night	47% 6% 11% 21% 14% 1	1440
	21st to end	Night	40% 8% 15% 23% 13% 1	1440
July	1st to 10th	Night	40% 7% 14% 22% 16% 1	1400
	11th to 20th	Night	42% 8% 15% 26% 9% 1	1392
	21st to end	Night	40% 8% 14% 25% 12% 2	1486
August	1st to 10th	Night	37% 7% 17% 24% 13% 2	1571
	11th to 20th	Night	41% 10% 15% 22% 12%	1619
	21st to end	Night	36% 6% 11% 26% 19% 1	1980
September	1st to 10th	Night	40% 7% 11% 22% 18% 1	1809
	11th to 20th	Night	34% 6% 10% 21% 26% 2	1980
	21st to end	Night	41% 6% 8% 22% 21% 3	1980
October	1st to 10th	Night	45% 5% 11% 21% 13% 4	1980
	11th to 20th	Night	38% 6% 13% 28% 14% 1	2189
	21st to end	Night	48% 4 11% 19% 15% 2	2574
November	1st to 10th	Night	38% 5% 12% 23% 18% 4	2407
	11th to 20th	Night	42% 3 10% 22% 20% 3	2470
	21st to end	Night	39% 5% 13% 27% 14% 2	2470
December	1st to 10th	Night	46% 5% 13% 21% 14% 1	2598
	11th to 20th	Night	44% 4 16% 17% 18% 2	3288
	21st to end	Night	50% 5% 9% 24% 11% 1	4884

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% 23% 28% 14% 3	180
	11th to 20th	Day	31% 25% 33% 9% 2 1	180
	21st to end	Day	24% 29% 35% 9% 3 1	198
February	1st to 10th	Day	30% 23% 34% 12% 2	391
	11th to 20th	Day	29% 31% 31% 7% 1	456
	21st to end	Day	30% 23% 33% 11% 3	382
March	1st to 10th	Day	29% 24% 32% 11% 3	420
	11th to 20th	Day	29% 27% 31% 9% 4 1	420
	21st to end	Day	29% 25% 29% 11% 6% 1	462
April	1st to 10th	Day	33% 23% 25% 12% 5% 1	420
	11th to 20th	Day	27% 27% 29% 12% 4	412
	21st to end	Day	30% 19% 35% 12% 3 1	420
May	1st to 10th	Day	37% 22% 28% 11% 2 1	423
	11th to 20th	Day	23% 21% 38% 13% 5%	447
	21st to end	Day	20% 15% 35% 23% 6% 1	485
June	1st to 10th	Day	22% 16% 36% 19% 6% 1	450
	11th to 20th	Day	18% 16% 41% 18% 6% 1	450
	21st to end	Day	16% 14% 40% 21% 8% 1	450
July	1st to 10th	Day	17% 11% 33% 26% 11% 2	445
	11th to 20th	Day	16% 6% 35% 31% 10% 2	444
	21st to end	Day	12% 10% 38% 29% 10% 1	488
August	1st to 10th	Day	13% 11% 33% 33% 9% 2	446
	11th to 20th	Day	15% 10% 33% 25% 14% 2	439
	21st to end	Day	14% 10% 34% 25% 13% 4	495
September	1st to 10th	Day	19% 12% 27% 27% 12% 4	450
	11th to 20th	Day	19% 15% 28% 19% 12% 7%	450
	21st to end	Day	23% 13% 33% 19% 9% 4	450
October	1st to 10th	Day	30% 12% 26% 20% 7% 5%	450
	11th to 20th	Day	18% 17% 34% 19% 10% 2	399
	21st to end	Day	27% 18% 31% 16% 6% 2	396
November	1st to 10th	Day	24% 17% 31% 16% 11% 1	365
	11th to 20th	Day	28% 21% 31% 16% 4	370
	21st to end	Day	28% 18% 32% 14% 6% 1	370
December	1st to 10th	Day	26% 27% 33% 11% 4	237
	11th to 20th	Day	34% 25% 33% 7% 2	180
	21st to end	Day	28% 24% 31% 12% 3 2	198
January	1st to 10th	Night	22% 22% 37% 16% 3	760
	11th to 20th	Night	28% 21% 34% 15% 2	760
	21st to end	Night	22% 21% 35% 18% 3	836
February	1st to 10th	Night	25% 20% 36% 18% 1	760
	11th to 20th	Night	25% 24% 37% 12% 1	743
	21st to end	Night	26% 23% 33% 15% 3	628
March	1st to 10th	Night	24% 20% 36% 16% 4	723
	11th to 20th	Night	20% 26% 35% 15% 4	720
	21st to end	Night	25% 20% 33% 18% 4	792
April	1st to 10th	Night	24% 22% 33% 18% 4	720
	11th to 20th	Night	24% 19% 36% 17% 4	698
	21st to end	Night	26% 17% 36% 19% 2	540
May	1st to 10th	Night	29% 16% 33% 17% 4	540
	11th to 20th	Night	22% 18% 38% 19% 3	532
	21st to end	Night	19% 8% 41% 26% 6%	390
June	1st to 10th	Night	19% 9% 35% 28% 8% 1	360
	11th to 20th	Night	21% 8% 38% 27% 6%	360
	21st to end	Night	18% 6% 39% 32% 5%	360
July	1st to 10th	Night	13% 4 38% 37% 8%	350
	11th to 20th	Night	15% 5% 30% 39% 10% 1	348
	21st to end	Night	13% 5% 34% 39% 9%	394
August	1st to 10th	Night	11% 6% 40% 35% 8%	507
	11th to 20th	Night	13% 5% 32% 41% 8% 1	555
	21st to end	Night	15% 6% 25% 38% 15% 2	792
September	1st to 10th	Night	15% 5% 35% 33% 10%	720
	11th to 20th	Night	18% 8% 29% 28% 15% 2	720
	21st to end	Night	21% 8% 28% 29% 11% 3	720
October	1st to 10th	Night	26% 10% 27% 24% 12% 2	720
	11th to 20th	Night	19% 12% 35% 22% 11% 1	720
	21st to end	Night	26% 15% 32% 19% 6% 1	792
November	1st to 10th	Night	20% 14% 33% 24% 9% 1	740
	11th to 20th	Night	24% 21% 30% 18% 7%	760
	21st to end	Night	23% 21% 34% 17% 5% 1	760
December	1st to 10th	Night	26% 19% 34% 16% 4	760
	11th to 20th	Night	25% 20% 32% 20% 2	760
	21st to end	Night	26% 19% 35% 18% 2	836

Page generated at 2024-02-27 06:30:12. Version ac07

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