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 2024-11-01.

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% 8% 2 6% 4 4 4 4 5% 7% 38%	101147
	Night	18% 8% 3 6% 4 4 4 3 5% 6% 39%	97803
Transparency	Day	45% 6% 12% 21% 14% 2	100905
	Night	45% 6% 12% 21% 14% 2	97665
Seeing	Day	24% 18% 33% 17% 7% 2	15081
	Night	22% 16% 34% 22% 6% 1	23962

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 6% 3 3 3 3 4 5% 46%	2517
	11th to 20th	Day	17% 9% 3 6% 4 4 4 3 5% 5% 40%	2520
	21st to end	Day	21% 11% 4 5% 4 4 4 3 4 6% 33%	2772
February	1st to 10th	Day	19% 8% 3 5% 5% 4 5% 4 5% 6% 36%	1793
	11th to 20th	Day	15% 7% 3 7% 6% 4 4 3 4 6% 41%	1848
	21st to end	Day	18% 10% 2 7% 4 4 4 3 4 6% 37%	1570
March	1st to 10th	Day	24% 17% 3 6% 4 3 3 2 4 4 30%	3116
	11th to 20th	Day	13% 7% 2 7% 4 4 5% 4 5% 7% 42%	3344
	21st to end	Day	23% 10% 2 6% 4 3 4 3 5% 5% 34%	4006
April	1st to 10th	Day	20% 9% 3 6% 4 4 3 3 5% 6% 38%	2280
	11th to 20th	Day	18% 7% 2 5% 5% 4 4 4 6% 7% 38%	2268
	21st to end	Day	21% 6% 3 6% 5% 4 4 4 6% 5% 37%	2470
May	1st to 10th	Day	25% 12% 3 7% 4 3 4 3 4 6% 28%	4106
	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	17% 7% 2 4 4 3 3 2 4 4 50%	1671
	11th to 20th	Day	19% 8% 1 3 4 4 3 3 5% 5% 45%	1710
	21st to end	Day	18% 6% 2 5% 4 4 4 3 5% 6% 43%	1710
December	1st to 10th	Day	19% 9% 3 6% 4 4 4 3 5% 5% 39%	1577
	11th to 20th	Day	22% 7% 2 4 4 3 3 3 4 4 44%	1906
	21st to end	Day	22% 10% 3 6% 5% 4 4 3 4 6% 34%	2772
January	1st to 10th	Night	17% 8% 2 5% 3 3 3 3 4 5% 48%	4429
	11th to 20th	Night	15% 10% 4 8% 4 4 3 3 4 5% 40%	4440
	21st to end	Night	22% 14% 4 7% 4 4 4 3 4 4 30%	4884
February	1st to 10th	Night	17% 9% 3 7% 4 4 4 4 5% 5% 39%	2385
	11th to 20th	Night	15% 9% 3 6% 5% 4 4 3 5% 6% 39%	2218
	21st to end	Night	19% 8% 2 6% 3 3 4 2 5% 5% 42%	1884
March	1st to 10th	Night	29% 11% 2 4 4 3 3 3 4 5% 33%	3724
	11th to 20th	Night	11% 9% 3 7% 4 4 4 3 6% 6% 42%	3613
	21st to end	Night	25% 9% 2 6% 4 4 4 4 5% 4 34%	3608
April	1st to 10th	Night	18% 9% 3 6% 5% 5% 4 3 5% 5% 37%	1900
	11th to 20th	Night	19% 8% 2 6% 5% 4 3 3 5% 6% 38%	1861
	21st to end	Night	21% 7% 3 5% 5% 4 3 3 5% 6% 39%	1710
May	1st to 10th	Night	25% 10% 3 8% 4 4 4 3 6% 6% 28%	2834
	11th to 20th	Night	22% 10% 3 7% 5% 5% 4 5% 5% 6% 26%	2813
	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	15% 5% 2 5% 4 4 4 3 4 5% 48%	2414
	11th to 20th	Night	18% 7% 2 5% 4 3 3 3 5% 5% 45%	2470
	21st to end	Night	16% 7% 2 5% 4 3 4 4 4 7% 45%	2470
December	1st to 10th	Night	19% 9% 3 5% 4 3 4 4 5% 5% 40%	2598
	11th to 20th	Night	19% 8% 2 5% 4 3 4 4 5% 6% 41%	3288
	21st to end	Night	20% 12% 4 6% 4 4 3 2 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	49% 4 11% 19% 14% 3	1570
March	1st to 10th	Day	58% 4 12% 14% 10% 3	3119
	11th to 20th	Day	38% 7% 15% 24% 13% 2	3344
	21st to end	Day	52% 3 6% 17% 15% 7%	4006
April	1st to 10th	Day	48% 4 11% 18% 16% 3	2280
	11th to 20th	Day	43% 6% 10% 21% 17% 3	2268
	21st to end	Day	46% 5% 9% 19% 16% 4	2470
May	1st to 10th	Day	57% 6% 11% 14% 10% 1	4120
	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	46% 4 10% 21% 15% 4	2090
	11th to 20th	Day	37% 5% 10% 28% 18% 2	1866
	21st to end	Day	43% 5% 14% 19% 16% 3	1881
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% 5% 9% 23% 15% 4	1884
March	1st to 10th	Night	55% 4 9% 18% 11% 3	3734
	11th to 20th	Night	40% 7% 15% 19% 16% 2	3614
	21st to end	Night	54% 3 6% 13% 17% 7%	3608
April	1st to 10th	Night	48% 5% 10% 19% 15% 3	1900
	11th to 20th	Night	47% 5% 9% 19% 18% 3	1861
	21st to end	Night	46% 6% 9% 19% 15% 4	1710
May	1st to 10th	Night	55% 8% 12% 15% 7% 2	2840
	11th to 20th	Night	56% 9% 13% 13% 7% 2	2814
	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	45% 5% 11% 22% 13% 4	2090
	11th to 20th	Night	37% 5% 13% 28% 16% 1	2311
	21st to end	Night	47% 4 12% 20% 15% 2	2717
November	1st to 10th	Night	38% 5% 12% 23% 18% 4	2414
	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	31% 23% 30% 11% 3	460
	11th to 20th	Day	29% 27% 30% 9% 4 1	460
	21st to end	Day	31% 25% 29% 10% 5% 1	506
April	1st to 10th	Day	33% 23% 26% 12% 5% 1	460
	11th to 20th	Day	28% 27% 29% 12% 4	452
	21st to end	Day	28% 19% 37% 12% 3 1	460
May	1st to 10th	Day	36% 22% 29% 11% 2 1	463
	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% 17% 31% 17% 7% 2	429
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	26% 19% 35% 16% 4	760
	11th to 20th	Night	20% 26% 35% 15% 4	760
	21st to end	Night	26% 21% 32% 17% 4	836
April	1st to 10th	Night	24% 22% 33% 18% 3	760
	11th to 20th	Night	25% 20% 35% 16% 4	737
	21st to end	Night	25% 18% 36% 19% 2	570
May	1st to 10th	Night	29% 16% 33% 18% 4	570
	11th to 20th	Night	22% 18% 38% 20% 3	562
	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% 20% 7% 1	836
November	1st to 10th	Night	20% 14% 33% 24% 9% 1	743
	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 2024-10-29 11:20:45. Version ac07

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