Moose Pond
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moose Pond clear sky chart from 2005-11-06 to 2026-01-17.

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% 2 6% 4 4 4 4 6% 7% 37%	127197
	Night	17% 8% 3 7% 4 4 5% 4 6% 6% 37%	124467
Transparency	Day	46% 5% 11% 21% 14% 2	130704
	Night	46% 5% 11% 21% 14% 2	129047
Seeing	Day	22% 14% 29% 22% 10% 3	16352
	Night	21% 9% 30% 31% 9% 1	25263

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	12% 8% 3 7% 5% 6% 5% 4 6% 7% 36%	3677
	11th to 20th	Day	12% 8% 3 6% 5% 4 4 4 5% 8% 41%	3618
	21st to end	Day	11% 9% 2 7% 4 4 4 3 5% 6% 45%	3960
February	1st to 10th	Day	14% 9% 4 6% 4 5% 5% 4 6% 6% 38%	1756
	11th to 20th	Day	11% 9% 3 8% 5% 4 4 4 7% 7% 38%	1948
	21st to end	Day	15% 10% 3 7% 4 5% 6% 4 5% 6% 36%	1650
March	1st to 10th	Day	21% 11% 3 8% 5% 4 4 3 4 4 32%	4476
	11th to 20th	Day	17% 9% 3 7% 5% 4 4 3 5% 6% 38%	4814
	21st to end	Day	26% 8% 3 6% 4 3 3 3 5% 7% 34%	5711
April	1st to 10th	Day	19% 11% 3 6% 4 4 4 2 5% 6% 36%	2400
	11th to 20th	Day	18% 6% 2 6% 5% 5% 5% 4 6% 6% 38%	2443
	21st to end	Day	22% 8% 3 7% 4 4 4 3 4 5% 35%	2600
May	1st to 10th	Day	33% 9% 3 8% 4 4 4 3 5% 5% 23%	5886
	11th to 20th	Day	19% 8% 3 9% 6% 6% 5% 4 5% 7% 29%	6079
	21st to end	Day	19% 6% 2 6% 4 5% 5% 4 6% 8% 33%	6949
June	1st to 10th	Day	22% 7% 3 6% 5% 5% 4 4 5% 7% 31%	2800
	11th to 20th	Day	16% 7% 3 5% 5% 4 4 4 6% 7% 38%	2800
	21st to end	Day	20% 7% 2 7% 5% 5% 5% 5% 5% 7% 32%	2800
July	1st to 10th	Day	16% 6% 2 6% 5% 5% 5% 5% 8% 9% 33%	6360
	11th to 20th	Day	12% 6% 2 6% 5% 4 4 5% 7% 9% 40%	6360
	21st to end	Day	15% 5% 2 5% 4 3 5% 4 6% 7% 44%	6926
August	1st to 10th	Day	14% 6% 2 7% 6% 5% 6% 4 6% 8% 36%	4338
	11th to 20th	Day	17% 8% 2 7% 5% 5% 5% 4 5% 6% 35%	4175
	21st to end	Day	11% 4 2 5% 4 5% 5% 3 6% 9% 46%	4396
September	1st to 10th	Day	12% 4 1 5% 4 3 4 5% 6% 8% 48%	2384
	11th to 20th	Day	13% 4 2 5% 3 3 3 3 4 6% 54%	2200
	21st to end	Day	16% 5% 1 4 4 4 3 4 5% 7% 46%	2200
October	1st to 10th	Day	19% 7% 2 5% 4 4 3 3 5% 6% 42%	2200
	11th to 20th	Day	18% 7% 2 5% 3 3 4 3 4 8% 43%	1911
	21st to end	Day	23% 8% 3 6% 4 4 3 4 4 6% 36%	1980
November	1st to 10th	Day	15% 6% 2 6% 3 3 3 4 5% 7% 45%	1851
	11th to 20th	Day	18% 5% 1 6% 3 3 4 4 6% 6% 43%	1890
	21st to end	Day	21% 8% 2 5% 3 4 4 4 5% 6% 39%	1865
December	1st to 10th	Day	17% 8% 3 8% 5% 5% 4 4 5% 8% 34%	2680
	11th to 20th	Day	18% 8% 2 5% 3 4 4 4 6% 7% 41%	3066
	21st to end	Day	19% 10% 2 6% 4 5% 5% 3 5% 5% 35%	4048
January	1st to 10th	Night	12% 8% 3 8% 5% 6% 5% 4 6% 6% 37%	6489
	11th to 20th	Night	11% 10% 4 11% 6% 6% 7% 5% 6% 6% 28%	6400
	21st to end	Night	13% 8% 3 8% 5% 5% 4 4 5% 7% 37%	6996
February	1st to 10th	Night	13% 11% 3 7% 5% 4 5% 5% 6% 6% 36%	2638
	11th to 20th	Night	10% 10% 3 5% 5% 5% 5% 4 6% 5% 41%	2338
	21st to end	Night	13% 10% 3 6% 5% 4 5% 3 5% 6% 39%	1980
March	1st to 10th	Night	23% 9% 4 7% 4 4 4 4 5% 5% 31%	5364
	11th to 20th	Night	14% 9% 3 8% 5% 5% 5% 4 5% 7% 34%	5131
	21st to end	Night	24% 8% 3 6% 4 4 4 3 5% 7% 32%	5205
April	1st to 10th	Night	19% 10% 3 7% 4 4 4 3 4 6% 36%	2000
	11th to 20th	Night	17% 8% 3 7% 5% 4 5% 4 5% 7% 36%	1904
	21st to end	Night	23% 8% 2 5% 4 3 4 4 4 5% 37%	1800
May	1st to 10th	Night	33% 9% 3 7% 5% 4 4 3 5% 6% 23%	4054
	11th to 20th	Night	16% 9% 3 9% 5% 6% 5% 4 5% 8% 29%	3855
	21st to end	Night	18% 7% 3 8% 5% 4 4 4 6% 7% 35%	3926
June	1st to 10th	Night	22% 8% 2 5% 4 4 5% 3 5% 6% 35%	1600
	11th to 20th	Night	18% 7% 2 5% 4 4 4 3 6% 8% 40%	1600
	21st to end	Night	19% 6% 2 6% 5% 4 4 4 6% 7% 37%	1600
July	1st to 10th	Night	13% 5% 2 6% 5% 4 5% 5% 8% 9% 39%	3600
	11th to 20th	Night	14% 6% 2 8% 4 4 5% 4 6% 8% 41%	3600
	21st to end	Night	11% 4 2 5% 4 4 5% 4 7% 8% 48%	3926
August	1st to 10th	Night	21% 7% 2 7% 5% 4 4 4 4 7% 34%	2779
	11th to 20th	Night	15% 7% 3 8% 4 5% 4 4 6% 7% 38%	2872
	21st to end	Night	10% 5% 2 7% 4 4 4 3 6% 8% 47%	3486
September	1st to 10th	Night	12% 5% 1 4 3 4 4 3 5% 7% 51%	2015
	11th to 20th	Night	14% 5% 2 4 3 3 3 3 4 5% 53%	2200
	21st to end	Night	15% 6% 2 5% 3 3 5% 3 5% 7% 46%	2200
October	1st to 10th	Night	19% 6% 2 6% 4 4 4 4 6% 6% 40%	2200
	11th to 20th	Night	17% 6% 2 5% 5% 4 4 4 6% 7% 41%	2483
	21st to end	Night	23% 8% 2 6% 3 4 4 4 5% 5% 36%	2860
November	1st to 10th	Night	16% 7% 2 6% 4 4 4 4 5% 6% 43%	2667
	11th to 20th	Night	16% 7% 2 6% 4 4 5% 3 5% 6% 42%	2730
	21st to end	Night	16% 9% 3 7% 4 4 4 3 4 6% 40%	2751
December	1st to 10th	Night	16% 11% 3 7% 4 4 5% 5% 8% 6% 30%	4720
	11th to 20th	Night	24% 7% 2 5% 4 3 4 4 5% 5% 37%	5348
	21st to end	Night	20% 10% 3 6% 4 4 4 3 7% 6% 33%	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	45% 5% 9% 26% 14% 1	3678
	11th to 20th	Day	41% 6% 12% 26% 13% 3	3648
	21st to end	Day	41% 4 9% 21% 19% 6%	3960
February	1st to 10th	Day	46% 6% 12% 20% 13% 3	1756
	11th to 20th	Day	44% 5% 13% 20% 14% 4	1957
	21st to end	Day	49% 5% 9% 18% 14% 4	1650
March	1st to 10th	Day	56% 4 7% 11% 13% 9%	4479
	11th to 20th	Day	46% 6% 14% 18% 12% 4	4814
	21st to end	Day	51% 4 5% 17% 18% 5%	5711
April	1st to 10th	Day	49% 5% 9% 18% 16% 4	2400
	11th to 20th	Day	43% 7% 10% 21% 14% 3	2443
	21st to end	Day	52% 5% 9% 16% 15% 4	2600
May	1st to 10th	Day	63% 7% 9% 14% 7% 1	5897
	11th to 20th	Day	53% 7% 12% 17% 9% 2	6083
	21st to end	Day	46% 7% 14% 20% 12% 1	6949
June	1st to 10th	Day	51% 7% 11% 20% 10% 1	2800
	11th to 20th	Day	42% 7% 13% 20% 16% 3	2800
	21st to end	Day	50% 8% 11% 18% 12% 1	2800
July	1st to 10th	Day	48% 4 13% 22% 12%	6290
	11th to 20th	Day	41% 5% 15% 24% 14% 1	6285
	21st to end	Day	39% 4 12% 27% 17%	6728
August	1st to 10th	Day	45% 6% 15% 25% 10%	4324
	11th to 20th	Day	49% 5% 14% 24% 8%	4214
	21st to end	Day	35% 5% 14% 26% 19% 2	4396
September	1st to 10th	Day	32% 7% 13% 29% 19% 1	2384
	11th to 20th	Day	32% 5% 9% 31% 21% 3	2200
	21st to end	Day	37% 5% 12% 25% 19% 1	2200
October	1st to 10th	Day	46% 4 8% 24% 16% 1	3590
	11th to 20th	Day	36% 3 10% 28% 21% 1	3088
	21st to end	Day	38% 3 10% 25% 20% 4	3180
November	1st to 10th	Day	38% 5% 15% 24% 16% 2	1851
	11th to 20th	Day	39% 6% 12% 20% 20% 4	1890
	21st to end	Day	46% 5% 15% 22% 12% 1	1865
December	1st to 10th	Day	48% 3 12% 26% 10% 1	2680
	11th to 20th	Day	43% 4 10% 18% 19% 6%	3066
	21st to end	Day	51% 5% 8% 18% 13% 6%	4048
January	1st to 10th	Night	44% 5% 11% 27% 12% 2	6489
	11th to 20th	Night	50% 7% 13% 18% 9% 2	6445
	21st to end	Night	44% 6% 8% 18% 18% 6%	6996
February	1st to 10th	Night	48% 5% 12% 18% 14% 3	2638
	11th to 20th	Night	43% 6% 11% 21% 16% 3	2340
	21st to end	Night	44% 5% 11% 21% 14% 4	1980
March	1st to 10th	Night	56% 3 8% 13% 14% 6%	5374
	11th to 20th	Night	47% 8% 17% 17% 10% 2	5132
	21st to end	Night	52% 4 5% 15% 20% 5%	5205
April	1st to 10th	Night	50% 4 9% 19% 15% 3	2000
	11th to 20th	Night	47% 6% 9% 21% 17% 1	1904
	21st to end	Night	48% 6% 10% 17% 15% 4	1800
May	1st to 10th	Night	62% 7% 9% 14% 7% 1	4060
	11th to 20th	Night	52% 8% 11% 19% 8% 2	3856
	21st to end	Night	48% 5% 16% 20% 9% 1	3927
June	1st to 10th	Night	49% 7% 13% 19% 12% 1	1600
	11th to 20th	Night	43% 6% 14% 21% 13% 2	1600
	21st to end	Night	46% 7% 14% 21% 10% 2	1600
July	1st to 10th	Night	42% 5% 17% 24% 11%	3560
	11th to 20th	Night	44% 5% 14% 23% 14%	3552
	21st to end	Night	35% 4 15% 34% 11% 1	3809
August	1st to 10th	Night	52% 5% 14% 20% 8%	2769
	11th to 20th	Night	45% 6% 15% 22% 11%	2899
	21st to end	Night	37% 5% 15% 26% 17% 1	3486
September	1st to 10th	Night	33% 6% 13% 31% 16%	2015
	11th to 20th	Night	33% 4 11% 30% 20% 2	2200
	21st to end	Night	37% 6% 12% 28% 15% 2	2200
October	1st to 10th	Night	46% 4 12% 22% 15% 1	3590
	11th to 20th	Night	35% 4 10% 27% 22% 2	4045
	21st to end	Night	42% 3 9% 27% 16% 2	4610
November	1st to 10th	Night	40% 5% 11% 26% 16% 2	2667
	11th to 20th	Night	41% 5% 11% 23% 16% 3	2730
	21st to end	Night	44% 5% 15% 22% 13% 1	2751
December	1st to 10th	Night	51% 4 9% 27% 9% 1	4720
	11th to 20th	Night	49% 4 9% 16% 19% 3	5348
	21st to end	Night	51% 4 8% 19% 16% 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	24% 21% 25% 23% 7%	220
	11th to 20th	Day	21% 22% 30% 21% 5% 1	212
	21st to end	Day	20% 17% 33% 23% 7%	220
February	1st to 10th	Day	27% 17% 33% 19% 4	336
	11th to 20th	Day	23% 20% 35% 18% 3	496
	21st to end	Day	23% 16% 33% 23% 6%	414
March	1st to 10th	Day	26% 16% 34% 20% 5%	500
	11th to 20th	Day	25% 18% 32% 17% 6% 1	500
	21st to end	Day	28% 18% 31% 14% 7% 3	550
April	1st to 10th	Day	29% 20% 26% 17% 6% 2	500
	11th to 20th	Day	28% 20% 29% 14% 7% 2	492
	21st to end	Day	29% 18% 29% 16% 6% 2	500
May	1st to 10th	Day	33% 15% 26% 19% 5% 2	503
	11th to 20th	Day	21% 17% 34% 16% 9% 3	527
	21st to end	Day	20% 14% 31% 23% 10% 2	573
June	1st to 10th	Day	21% 13% 35% 21% 9% 1	530
	11th to 20th	Day	18% 16% 28% 25% 11% 2	530
	21st to end	Day	22% 10% 33% 22% 12% 2	530
July	1st to 10th	Day	18% 7% 32% 27% 13% 4	525
	11th to 20th	Day	15% 6% 33% 30% 12% 4	524
	21st to end	Day	16% 6% 31% 29% 14% 4	576
August	1st to 10th	Day	13% 7% 25% 31% 19% 5%	526
	11th to 20th	Day	16% 7% 25% 29% 14% 9%	519
	21st to end	Day	11% 10% 25% 31% 16% 7%	583
September	1st to 10th	Day	13% 8% 28% 25% 19% 7%	530
	11th to 20th	Day	14% 12% 23% 21% 17% 13%	530
	21st to end	Day	17% 10% 27% 25% 13% 6%	530
October	1st to 10th	Day	22% 12% 22% 23% 15% 5%	530
	11th to 20th	Day	21% 14% 26% 22% 15% 2	442
	21st to end	Day	29% 13% 25% 23% 8%	462
November	1st to 10th	Day	23% 16% 27% 23% 8% 2	425
	11th to 20th	Day	27% 15% 27% 21% 8% 1	430
	21st to end	Day	30% 17% 24% 22% 6%	405
December	1st to 10th	Day	25% 20% 27% 19% 10%	220
	11th to 20th	Day	29% 17% 34% 16% 5%	220
	21st to end	Day	26% 19% 28% 19% 6% 1	242
January	1st to 10th	Night	20% 10% 38% 28% 4	840
	11th to 20th	Night	24% 13% 30% 28% 4	825
	21st to end	Night	17% 13% 37% 28% 4	880
February	1st to 10th	Night	22% 11% 37% 28% 3	800
	11th to 20th	Night	18% 11% 42% 26% 3	783
	21st to end	Night	20% 12% 35% 29% 5%	660
March	1st to 10th	Night	24% 13% 35% 26% 2	800
	11th to 20th	Night	21% 13% 33% 26% 7%	800
	21st to end	Night	24% 12% 32% 25% 6% 1	880
April	1st to 10th	Night	27% 11% 31% 27% 4	800
	11th to 20th	Night	21% 13% 34% 27% 5%	720
	21st to end	Night	25% 15% 30% 26% 5%	600
May	1st to 10th	Night	25% 11% 27% 30% 6% 1	600
	11th to 20th	Night	20% 9% 30% 32% 8% 1	518
	21st to end	Night	21% 6% 24% 38% 11% 1	433
June	1st to 10th	Night	23% 6% 26% 36% 10% 1	400
	11th to 20th	Night	19% 5% 26% 36% 14% 1	400
	21st to end	Night	22% 3 22% 41% 13%	400
July	1st to 10th	Night	14% 3 21% 45% 17%	390
	11th to 20th	Night	16% 2 18% 45% 20% 1	388
	21st to end	Night	16% 1 16% 49% 17% 1	438
August	1st to 10th	Night	16% 3 17% 45% 19% 1	513
	11th to 20th	Night	15% 3 25% 37% 18% 2	592
	21st to end	Night	15% 4 20% 39% 19% 3	819
September	1st to 10th	Night	15% 3 26% 36% 19% 2	800
	11th to 20th	Night	17% 5% 22% 30% 21% 4	800
	21st to end	Night	17% 7% 26% 31% 18% 2	800
October	1st to 10th	Night	21% 8% 21% 33% 16% 2	800
	11th to 20th	Night	21% 9% 29% 28% 12% 1	800
	21st to end	Night	28% 9% 28% 29% 7%	880
November	1st to 10th	Night	21% 11% 30% 29% 8% 1	820
	11th to 20th	Night	21% 13% 31% 27% 8% 1	840
	21st to end	Night	22% 15% 30% 27% 6%	840
December	1st to 10th	Night	25% 7% 37% 25% 5% 1	840
	11th to 20th	Night	24% 12% 33% 27% 4	840
	21st to end	Night	26% 11% 32% 27% 4	924

Page generated at 2026-01-14 01:14:27. Version ac07

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