Young's Pond
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Young's Pond clear sky chart from 2005-11-06 to 2026-03-03.

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 5% 4 4 4 3 5% 7% 41%	130668
	Night	18% 8% 2 6% 4 4 4 3 5% 6% 41%	130504
Transparency	Day	40% 7% 13% 22% 16% 3	134210
	Night	43% 5% 12% 22% 16% 3	135048
Seeing	Day	17% 11% 28% 28% 13% 3	16662
	Night	20% 11% 30% 28% 10% 1	25819

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	13% 9% 2 5% 4 5% 5% 4 5% 5% 44%	4661
	11th to 20th	Day	15% 9% 2 6% 3 3 3 3 5% 4 45%	4650
	21st to end	Day	16% 8% 2 6% 3 4 4 3 5% 6% 44%	5281
February	1st to 10th	Day	16% 7% 2 6% 4 5% 5% 4 5% 6% 39%	1977
	11th to 20th	Day	16% 6% 2 6% 4 4 4 3 6% 7% 42%	2048
	21st to end	Day	20% 8% 2 5% 4 3 3 3 5% 6% 38%	1730
March	1st to 10th	Day	23% 8% 2 5% 4 3 3 3 4 5% 41%	4496
	11th to 20th	Day	14% 8% 3 5% 4 4 4 3 5% 7% 42%	4648
	21st to end	Day	20% 8% 2 5% 4 4 4 4 5% 7% 37%	5970
April	1st to 10th	Day	19% 8% 2 5% 4 4 4 4 5% 7% 38%	2400
	11th to 20th	Day	20% 6% 2 5% 4 4 4 3 5% 6% 41%	2374
	21st to end	Day	20% 5% 2 5% 5% 4 3 3 5% 5% 41%	2510
May	1st to 10th	Day	30% 8% 2 5% 3 4 4 3 5% 7% 28%	5886
	11th to 20th	Day	22% 8% 2 6% 4 4 4 3 5% 7% 35%	6085
	21st to end	Day	20% 7% 3 6% 4 4 4 3 6% 8% 36%	6949
June	1st to 10th	Day	18% 6% 2 5% 4 4 4 4 7% 9% 36%	2800
	11th to 20th	Day	17% 6% 2 5% 3 5% 4 4 5% 10% 39%	2800
	21st to end	Day	13% 7% 2 5% 4 5% 5% 4 6% 9% 42%	2800
July	1st to 10th	Day	15% 7% 2 7% 5% 4 4 4 6% 9% 36%	6360
	11th to 20th	Day	13% 7% 2 6% 4 4 5% 4 7% 10% 37%	6360
	21st to end	Day	15% 6% 2 6% 4 4 4 4 5% 7% 43%	6926
August	1st to 10th	Day	19% 6% 3 6% 4 5% 5% 4 5% 8% 35%	4372
	11th to 20th	Day	12% 6% 2 6% 5% 3 4 4 6% 8% 45%	3864
	21st to end	Day	7% 5% 2 5% 4 5% 5% 4 7% 10% 46%	4312
September	1st to 10th	Day	14% 5% 2 6% 4 4 4 4 5% 6% 47%	2400
	11th to 20th	Day	12% 5% 2 4 4 3 3 3 5% 6% 53%	2255
	21st to end	Day	19% 6% 2 6% 4 4 4 3 4 6% 40%	2200
October	1st to 10th	Day	20% 6% 2 5% 4 3 3 3 4 6% 44%	2180
	11th to 20th	Day	14% 6% 2 4 3 4 3 3 5% 8% 47%	1980
	21st to end	Day	18% 6% 2 5% 4 4 4 4 6% 6% 42%	1980
November	1st to 10th	Day	14% 6% 2 5% 4 4 3 2 4 5% 50%	1851
	11th to 20th	Day	18% 6% 1 4 2 3 3 3 4 6% 49%	1890
	21st to end	Day	18% 7% 2 4 3 3 4 3 5% 7% 44%	1879
December	1st to 10th	Day	16% 6% 2 6% 4 4 3 3 5% 7% 45%	2680
	11th to 20th	Day	22% 7% 2 4 3 3 2 2 3 6% 47%	3066
	21st to end	Day	20% 9% 3 6% 4 3 3 3 4 5% 40%	4048
January	1st to 10th	Night	15% 7% 2 5% 3 3 4 3 5% 6% 47%	8234
	11th to 20th	Night	16% 9% 3 7% 3 3 3 2 4 5% 45%	8235
	21st to end	Night	17% 8% 2 7% 4 4 4 3 4 5% 42%	8895
February	1st to 10th	Night	16% 9% 3 6% 4 4 3 4 4 6% 40%	2641
	11th to 20th	Night	18% 9% 3 5% 4 3 3 4 5% 7% 40%	2458
	21st to end	Night	20% 8% 2 6% 4 4 4 3 4 5% 40%	2076
March	1st to 10th	Night	22% 9% 2 5% 4 3 3 2 4 5% 40%	5389
	11th to 20th	Night	17% 10% 3 6% 3 4 4 3 4 6% 41%	5306
	21st to end	Night	21% 9% 2 6% 4 3 4 3 5% 5% 38%	4962
April	1st to 10th	Night	20% 8% 2 7% 4 4 4 3 5% 7% 37%	2000
	11th to 20th	Night	20% 5% 2 6% 4 3 3 3 4 6% 41%	1975
	21st to end	Night	20% 7% 2 5% 5% 4 4 3 4 5% 42%	1889
May	1st to 10th	Night	28% 11% 3 7% 4 3 3 3 5% 6% 27%	4054
	11th to 20th	Night	23% 9% 2 6% 4 3 4 4 5% 8% 31%	3851
	21st to end	Night	24% 9% 2 6% 4 4 4 3 5% 7% 33%	3926
June	1st to 10th	Night	19% 6% 2 6% 5% 4 5% 3 4 7% 39%	1600
	11th to 20th	Night	17% 7% 2 5% 4 4 4 3 6% 9% 40%	1600
	21st to end	Night	13% 7% 2 5% 4 5% 4 3 6% 9% 42%	1600
July	1st to 10th	Night	17% 8% 3 7% 5% 4 4 3 5% 8% 36%	3600
	11th to 20th	Night	21% 9% 2 7% 4 4 4 4 7% 8% 32%	3600
	21st to end	Night	15% 7% 3 5% 4 4 4 4 5% 7% 43%	3926
August	1st to 10th	Night	23% 7% 3 7% 5% 4 5% 4 7% 7% 29%	2746
	11th to 20th	Night	13% 7% 3 7% 5% 5% 5% 4 6% 7% 40%	3166
	21st to end	Night	9% 4 2 4 3 3 4 3 5% 8% 54%	3586
September	1st to 10th	Night	13% 6% 3 6% 4 5% 5% 3 6% 7% 44%	2000
	11th to 20th	Night	14% 5% 2 4 3 3 2 3 4 6% 53%	2145
	21st to end	Night	19% 6% 3 6% 3 5% 4 3 4 6% 42%	2200
October	1st to 10th	Night	19% 7% 2 6% 4 3 3 3 4 6% 42%	2216
	11th to 20th	Night	16% 5% 2 5% 4 3 4 3 4 5% 49%	2418
	21st to end	Night	21% 7% 2 5% 3 3 3 3 5% 6% 42%	2860
November	1st to 10th	Night	12% 6% 2 5% 4 4 4 3 5% 5% 49%	2667
	11th to 20th	Night	19% 6% 2 5% 3 3 3 3 4 5% 48%	2730
	21st to end	Night	16% 6% 2 5% 4 4 4 3 5% 7% 46%	2735
December	1st to 10th	Night	18% 7% 2 4 3 3 4 3 4 5% 48%	4720
	11th to 20th	Night	26% 7% 2 4 3 3 3 2 3 4 42%	5348
	21st to end	Night	20% 9% 3 6% 3 3 3 2 4 5% 42%	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	38% 5% 10% 27% 16% 2	4662
	11th to 20th	Day	40% 5% 10% 22% 16% 7%	4680
	21st to end	Day	39% 5% 12% 25% 17% 1	5281
February	1st to 10th	Day	43% 6% 14% 20% 15% 2	1977
	11th to 20th	Day	39% 6% 11% 25% 16% 3	2057
	21st to end	Day	44% 6% 11% 21% 15% 3	1730
March	1st to 10th	Day	42% 5% 12% 17% 13% 9%	4499
	11th to 20th	Day	37% 7% 16% 28% 12% 1	4648
	21st to end	Day	44% 5% 9% 15% 20% 6%	5970
April	1st to 10th	Day	42% 7% 11% 20% 16% 4	2400
	11th to 20th	Day	41% 6% 11% 20% 18% 3	2374
	21st to end	Day	41% 7% 10% 22% 16% 4	2510
May	1st to 10th	Day	52% 7% 17% 14% 9% 1	5897
	11th to 20th	Day	47% 7% 14% 18% 13% 2	6089
	21st to end	Day	43% 9% 12% 22% 13% 1	6949
June	1st to 10th	Day	41% 8% 13% 24% 13% 1	2800
	11th to 20th	Day	39% 8% 15% 24% 13% 1	2800
	21st to end	Day	36% 9% 14% 25% 14% 1	2800
July	1st to 10th	Day	43% 10% 12% 19% 14% 1	6290
	11th to 20th	Day	40% 8% 19% 22% 11% 1	6285
	21st to end	Day	39% 6% 11% 23% 19% 1	6728
August	1st to 10th	Day	45% 7% 16% 22% 9% 1	4358
	11th to 20th	Day	35% 7% 16% 31% 11% 1	3900
	21st to end	Day	29% 9% 14% 29% 17% 2	4312
September	1st to 10th	Day	36% 8% 13% 23% 19% 2	2400
	11th to 20th	Day	30% 6% 12% 24% 24% 2	2255
	21st to end	Day	44% 7% 10% 18% 19% 2	2200
October	1st to 10th	Day	33% 6% 11% 21% 23% 6%	3557
	11th to 20th	Day	27% 4 10% 25% 30% 4	3208
	21st to end	Day	30% 5% 15% 26% 21% 3	3180
November	1st to 10th	Day	37% 4 15% 22% 21% 2	1851
	11th to 20th	Day	36% 5% 12% 22% 22% 3	1890
	21st to end	Day	40% 4 14% 28% 11% 2	1879
December	1st to 10th	Day	39% 4 15% 28% 12% 1	2680
	11th to 20th	Day	41% 3 15% 19% 19% 3	3066
	21st to end	Day	47% 5% 9% 20% 15% 4	4048
January	1st to 10th	Night	39% 4 12% 25% 19% 2	8234
	11th to 20th	Night	43% 3 11% 20% 16% 6%	8280
	21st to end	Night	44% 4 9% 21% 18% 4	8895
February	1st to 10th	Night	45% 5% 12% 23% 13% 2	2641
	11th to 20th	Night	43% 5% 9% 22% 17% 4	2460
	21st to end	Night	46% 4 9% 23% 14% 4	2076
March	1st to 10th	Night	46% 4 12% 18% 14% 7%	5399
	11th to 20th	Night	43% 5% 15% 22% 11% 4	5307
	21st to end	Night	48% 5% 7% 12% 23% 5%	4962
April	1st to 10th	Night	47% 5% 11% 19% 15% 4	2000
	11th to 20th	Night	44% 5% 10% 20% 19% 2	1975
	21st to end	Night	44% 5% 10% 20% 17% 4	1889
May	1st to 10th	Night	57% 6% 14% 12% 10% 1	4060
	11th to 20th	Night	51% 7% 13% 14% 11% 3	3852
	21st to end	Night	49% 7% 14% 20% 9% 1	3927
June	1st to 10th	Night	45% 6% 11% 19% 18% 2	1600
	11th to 20th	Night	40% 7% 15% 26% 11% 1	1600
	21st to end	Night	39% 7% 15% 24% 14% 1	1600
July	1st to 10th	Night	47% 7% 13% 21% 11% 1	3560
	11th to 20th	Night	48% 7% 16% 19% 9% 1	3552
	21st to end	Night	40% 6% 14% 23% 16% 1	3809
August	1st to 10th	Night	50% 9% 15% 17% 9% 1	2736
	11th to 20th	Night	42% 8% 14% 27% 8% 1	3195
	21st to end	Night	27% 6% 14% 32% 19% 1	3586
September	1st to 10th	Night	39% 7% 10% 25% 17% 2	2000
	11th to 20th	Night	33% 5% 11% 24% 25% 3	2145
	21st to end	Night	44% 6% 9% 19% 19% 2	2200
October	1st to 10th	Night	39% 5% 11% 23% 19% 3	3619
	11th to 20th	Night	26% 4 10% 25% 30% 4	3929
	21st to end	Night	32% 4 14% 26% 21% 2	4610
November	1st to 10th	Night	36% 6% 12% 23% 20% 4	2667
	11th to 20th	Night	39% 4 10% 23% 19% 4	2730
	21st to end	Night	38% 5% 13% 29% 13% 2	2735
December	1st to 10th	Night	40% 4 12% 29% 14% 2	4720
	11th to 20th	Night	47% 3 11% 19% 17% 2	5348
	21st to end	Night	45% 4 10% 20% 16% 4	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	16% 22% 35% 21% 4	220
	11th to 20th	Day	16% 27% 38% 15% 2	220
	21st to end	Day	18% 20% 37% 17% 7% 1	270
February	1st to 10th	Day	18% 18% 42% 18% 3	417
	11th to 20th	Day	19% 21% 40% 18% 2	536
	21st to end	Day	21% 19% 35% 20% 4	446
March	1st to 10th	Day	18% 19% 34% 25% 4	508
	11th to 20th	Day	16% 14% 42% 21% 5% 1	500
	21st to end	Day	21% 17% 38% 18% 5% 1	550
April	1st to 10th	Day	24% 14% 36% 19% 7% 1	500
	11th to 20th	Day	21% 12% 35% 24% 7% 1	492
	21st to end	Day	22% 11% 33% 27% 5% 2	500
May	1st to 10th	Day	25% 12% 30% 25% 7% 2	503
	11th to 20th	Day	18% 7% 32% 31% 10% 1	527
	21st to end	Day	20% 6% 20% 32% 18% 4	573
June	1st to 10th	Day	17% 5% 23% 33% 18% 3	530
	11th to 20th	Day	16% 5% 24% 37% 15% 2	530
	21st to end	Day	13% 5% 24% 35% 20% 4	530
July	1st to 10th	Day	14% 3 19% 34% 25% 5%	525
	11th to 20th	Day	12% 3 14% 39% 25% 6%	524
	21st to end	Day	13% 3 19% 42% 20% 2	576
August	1st to 10th	Day	10% 3 19% 37% 24% 7%	526
	11th to 20th	Day	12% 4 15% 39% 24% 6%	519
	21st to end	Day	9% 4 23% 36% 21% 7%	583
September	1st to 10th	Day	16% 5% 24% 27% 21% 8%	530
	11th to 20th	Day	13% 4 22% 31% 22% 8%	530
	21st to end	Day	20% 7% 27% 29% 15% 3	530
October	1st to 10th	Day	23% 8% 22% 24% 17% 7%	530
	11th to 20th	Day	14% 11% 30% 28% 13% 2	519
	21st to end	Day	23% 11% 29% 26% 9% 2	462
November	1st to 10th	Day	13% 14% 31% 30% 11% 3	425
	11th to 20th	Day	18% 18% 35% 22% 7%	430
	21st to end	Day	19% 20% 29% 24% 8%	419
December	1st to 10th	Day	17% 20% 32% 23% 7%	220
	11th to 20th	Day	26% 21% 30% 19% 4	220
	21st to end	Day	23% 16% 34% 18% 8% 1	242
January	1st to 10th	Night	19% 20% 38% 19% 4	840
	11th to 20th	Night	25% 18% 34% 20% 3	840
	21st to end	Night	20% 19% 37% 21% 2	924
February	1st to 10th	Night	19% 15% 39% 25% 2	840
	11th to 20th	Night	23% 16% 41% 19% 1	823
	21st to end	Night	24% 14% 39% 19% 4	692
March	1st to 10th	Night	21% 15% 36% 24% 5%	809
	11th to 20th	Night	20% 11% 38% 25% 6% 1	800
	21st to end	Night	22% 12% 36% 25% 5%	880
April	1st to 10th	Night	23% 11% 34% 27% 5%	800
	11th to 20th	Night	22% 7% 36% 28% 7%	791
	21st to end	Night	22% 6% 34% 30% 7% 1	689
May	1st to 10th	Night	24% 9% 28% 29% 10% 1	600
	11th to 20th	Night	23% 7% 32% 30% 8%	514
	21st to end	Night	20% 4 18% 39% 17% 1	433
June	1st to 10th	Night	18% 6% 25% 34% 17% 2	400
	11th to 20th	Night	19% 4 18% 43% 16% 1	400
	21st to end	Night	13% 4 21% 43% 18% 1	400
July	1st to 10th	Night	13% 3 18% 41% 23% 2	390
	11th to 20th	Night	13% 4 15% 45% 21% 3	388
	21st to end	Night	14% 3 17% 47% 18% 2	438
August	1st to 10th	Night	12% 2 17% 46% 22% 1	493
	11th to 20th	Night	13% 2 16% 40% 25% 3	771
	21st to end	Night	14% 3 19% 37% 23% 4	880
September	1st to 10th	Night	16% 3 25% 32% 19% 4	800
	11th to 20th	Night	16% 4 21% 33% 21% 6%	800
	21st to end	Night	21% 5% 24% 32% 16% 2	800
October	1st to 10th	Night	22% 8% 26% 26% 14% 4	800
	11th to 20th	Night	18% 11% 31% 29% 10% 1	800
	21st to end	Night	24% 12% 32% 23% 8%	880
November	1st to 10th	Night	16% 12% 33% 27% 11% 2	820
	11th to 20th	Night	20% 17% 33% 23% 6% 1	840
	21st to end	Night	17% 20% 32% 25% 6% 1	840
December	1st to 10th	Night	24% 16% 32% 22% 5% 1	840
	11th to 20th	Night	25% 17% 33% 21% 3	840
	21st to end	Night	24% 17% 36% 21% 2	924

Page generated at 2026-02-28 01:40:25. Version ac07

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