Golden Pond Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Golden Pond Observatory clear sky chart from 2005-11-06 to 2024-03-23.

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	14% 7% 3 5% 5% 3 5% 5% 5% 7% 41%	78832
	Night	15% 8% 3 5% 4 3 4 4 5% 7% 43%	81083
Transparency	Day	28% 36% 8% 15% 11% 2	78540
	Night	28% 35% 7% 15% 12% 3	80896
Seeing	Day	16% 9% 23% 25% 18% 8%	14444
	Night	18% 9% 25% 29% 17% 2	24416

By Month

Percentage Cloud Cover SE (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	14% 12% 6% 9% 6% 3 5% 4 4 5% 32%	2527
	11th to 20th	Day	19% 10% 3 6% 6% 4 6% 3 3 4 35%	2576
	21st to end	Day	24% 11% 5% 5% 5% 2 4 4 4 6% 30%	3228
February	1st to 10th	Day	19% 11% 4 5% 5% 2 4 4 4 7% 36%	1900
	11th to 20th	Day	19% 9% 4 6% 5% 3 4 3 5% 6% 36%	1848
	21st to end	Day	20% 11% 4 6% 6% 2 4 5% 3 6% 35%	1570
March	1st to 10th	Day	18% 10% 3 6% 5% 3 4 3 3 5% 40%	1900
	11th to 20th	Day	20% 10% 4 6% 5% 3 3 4 4 5% 36%	1957
	21st to end	Day	18% 10% 4 7% 6% 3 4 4 5% 7% 33%	2400
April	1st to 10th	Day	13% 5% 3 5% 5% 3 5% 4 5% 7% 45%	2160
	11th to 20th	Day	17% 7% 3 5% 5% 3 4 4 6% 6% 41%	2134
	21st to end	Day	17% 6% 3 5% 5% 3 4 4 4 7% 41%	2160
May	1st to 10th	Day	16% 6% 3 5% 5% 3 5% 4 5% 8% 39%	2312
	11th to 20th	Day	16% 6% 3 6% 5% 3 4 4 5% 7% 40%	2301
	21st to end	Day	9% 5% 3 6% 6% 5% 6% 7% 7% 9% 38%	2561
June	1st to 10th	Day	9% 4 2 5% 5% 3 5% 5% 7% 8% 46%	2520
	11th to 20th	Day	4 3 2 3 6% 4 5% 7% 8% 10% 48%	2520
	21st to end	Day	5% 3 2 5% 6% 3 6% 7% 7% 10% 46%	2520
July	1st to 10th	Day	8% 5% 3 6% 7% 4 6% 6% 7% 10% 38%	2520
	11th to 20th	Day	7% 5% 2 6% 5% 4 6% 5% 7% 9% 45%	2520
	21st to end	Day	6% 5% 3 5% 6% 3 5% 6% 9% 12% 40%	2657
August	1st to 10th	Day	7% 5% 2 5% 6% 3 6% 7% 7% 10% 43%	2148
	11th to 20th	Day	9% 5% 3 6% 6% 3 6% 5% 6% 9% 43%	2125
	21st to end	Day	8% 4 2 4 5% 3 5% 5% 7% 10% 48%	2376
September	1st to 10th	Day	11% 4 2 5% 6% 4 5% 5% 5% 8% 45%	2160
	11th to 20th	Day	11% 5% 2 5% 5% 3 5% 4 4 7% 49%	2018
	21st to end	Day	11% 4 2 4 4 3 3 4 5% 7% 53%	1980
October	1st to 10th	Day	10% 4 2 4 4 2 4 3 4 7% 56%	1980
	11th to 20th	Day	14% 5% 3 4 4 2 3 4 4 6% 51%	1831
	21st to end	Day	20% 8% 2 4 4 2 3 4 3 5% 47%	1858
November	1st to 10th	Day	11% 5% 2 4 3 3 3 3 5% 7% 54%	1672
	11th to 20th	Day	16% 6% 2 4 4 2 3 3 4 6% 49%	1710
	21st to end	Day	18% 8% 3 5% 5% 2 3 4 5% 6% 43%	1710
December	1st to 10th	Day	19% 10% 3 6% 5% 2 4 4 4 5% 36%	1710
	11th to 20th	Day	16% 11% 3 6% 5% 3 4 5% 6% 6% 34%	1980
	21st to end	Day	16% 12% 4 7% 6% 4 5% 5% 5% 7% 30%	2783
January	1st to 10th	Night	19% 11% 3 6% 4 2 4 4 5% 6% 35%	4428
	11th to 20th	Night	17% 13% 4 9% 6% 4 4 3 3 4 33%	4379
	21st to end	Night	25% 12% 4 5% 4 2 3 3 4 5% 32%	4434
February	1st to 10th	Night	22% 11% 4 7% 5% 3 4 4 3 5% 33%	2280
	11th to 20th	Night	20% 8% 4 6% 5% 2 3 4 4 5% 39%	2218
	21st to end	Night	22% 9% 3 5% 6% 3 4 3 5% 5% 35%	1884
March	1st to 10th	Night	17% 9% 2 6% 4 3 4 4 4 5% 42%	2280
	11th to 20th	Night	18% 9% 3 5% 5% 2 3 4 5% 6% 39%	2236
	21st to end	Night	18% 10% 4 6% 5% 3 4 4 5% 7% 35%	2000
April	1st to 10th	Night	11% 6% 2 4 4 3 4 4 5% 8% 50%	1800
	11th to 20th	Night	15% 6% 2 4 4 3 3 4 5% 5% 47%	1775
	21st to end	Night	15% 7% 2 5% 4 3 4 5% 5% 9% 41%	1800
May	1st to 10th	Night	17% 6% 2 4 4 3 4 4 4 7% 45%	1648
	11th to 20th	Night	12% 6% 2 6% 5% 3 5% 4 7% 9% 41%	1592
	21st to end	Night	6% 4 2 5% 6% 4 5% 6% 7% 11% 44%	1709
June	1st to 10th	Night	11% 5% 2 4 5% 3 4 5% 5% 10% 47%	1440
	11th to 20th	Night	5% 3 1 3 3 2 3 6% 6% 11% 56%	1440
	21st to end	Night	3 2 1 4 4 3 7% 5% 8% 13% 50%	1440
July	1st to 10th	Night	6% 3 2 6% 6% 5% 5% 6% 6% 10% 46%	1440
	11th to 20th	Night	6% 3 3 4 4 3 5% 6% 6% 9% 51%	1440
	21st to end	Night	6% 4 2 5% 4 2 5% 6% 6% 9% 50%	1656
August	1st to 10th	Night	5% 3 1 5% 5% 3 5% 5% 7% 10% 51%	1790
	11th to 20th	Night	6% 5% 2 4 4 3 5% 5% 6% 9% 49%	1776
	21st to end	Night	7% 4 2 4 4 2 4 6% 7% 9% 51%	1980
September	1st to 10th	Night	10% 5% 2 4 4 2 4 4 4 7% 52%	1800
	11th to 20th	Night	9% 5% 2 4 4 3 4 4 6% 7% 51%	1922
	21st to end	Night	9% 5% 2 4 4 3 4 3 4 6% 56%	1980
October	1st to 10th	Night	10% 3 1 4 4 2 3 3 4 6% 59%	1980
	11th to 20th	Night	16% 5% 2 4 4 2 4 4 4 5% 52%	2127
	21st to end	Night	20% 8% 2 4 4 2 3 3 4 5% 46%	2497
November	1st to 10th	Night	13% 5% 2 4 4 2 2 3 4 6% 55%	2406
	11th to 20th	Night	13% 6% 2 4 5% 2 3 4 5% 6% 49%	2470
	21st to end	Night	19% 7% 3 4 4 2 3 3 3 5% 47%	2470
December	1st to 10th	Night	20% 12% 3 5% 3 3 4 5% 5% 6% 35%	2470
	11th to 20th	Night	17% 10% 3 5% 4 3 4 4 4 5% 43%	3212
	21st to end	Night	17% 13% 4 7% 6% 4 5% 5% 5% 6% 29%	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	40% 28% 6% 19% 6%	2528
	11th to 20th	Day	34% 29% 7% 17% 11% 1	2576
	21st to end	Day	47% 23% 8% 15% 7%	3228
February	1st to 10th	Day	34% 35% 5% 16% 10% 1	1900
	11th to 20th	Day	33% 35% 5% 13% 11% 4	1858
	21st to end	Day	36% 34% 6% 11% 10% 2	1570
March	1st to 10th	Day	31% 34% 5% 14% 12% 3	1900
	11th to 20th	Day	36% 35% 6% 13% 8% 2	1957
	21st to end	Day	35% 38% 8% 12% 6% 1	2400
April	1st to 10th	Day	22% 37% 8% 16% 15% 2	2160
	11th to 20th	Day	26% 35% 6% 14% 15% 3	2134
	21st to end	Day	30% 36% 7% 17% 9% 1	2160
May	1st to 10th	Day	33% 38% 8% 13% 8% 1	2312
	11th to 20th	Day	29% 38% 8% 12% 11% 1	2305
	21st to end	Day	24% 39% 11% 15% 9% 1	2561
June	1st to 10th	Day	21% 39% 9% 17% 13% 2	2520
	11th to 20th	Day	17% 39% 10% 18% 14% 2	2520
	21st to end	Day	19% 38% 9% 16% 13% 5%	2520
July	1st to 10th	Day	23% 39% 10% 16% 8% 4	2451
	11th to 20th	Day	24% 41% 11% 11% 10% 3	2445
	21st to end	Day	23% 41% 12% 17% 7% 1	2509
August	1st to 10th	Day	21% 39% 10% 18% 11% 1	2136
	11th to 20th	Day	23% 38% 8% 17% 12% 2	2125
	21st to end	Day	19% 38% 8% 19% 11% 4	2376
September	1st to 10th	Day	28% 37% 7% 14% 12% 2	2160
	11th to 20th	Day	26% 38% 5% 14% 16% 1	2018
	21st to end	Day	20% 37% 6% 15% 17% 5%	1980
October	1st to 10th	Day	17% 36% 6% 15% 23% 4	1980
	11th to 20th	Day	24% 36% 5% 15% 14% 4	1831
	21st to end	Day	26% 37% 4 16% 14% 3	1858
November	1st to 10th	Day	15% 40% 7% 16% 18% 4	1672
	11th to 20th	Day	24% 39% 6% 14% 14% 3	1710
	21st to end	Day	26% 39% 5% 15% 11% 3	1710
December	1st to 10th	Day	30% 40% 7% 14% 8% 1	1710
	11th to 20th	Day	32% 34% 8% 16% 9% 1	1977
	21st to end	Day	40% 27% 11% 13% 8%	2783
January	1st to 10th	Night	36% 27% 6% 22% 8%	4428
	11th to 20th	Night	38% 29% 5% 15% 10% 2	4379
	21st to end	Night	46% 23% 6% 17% 7%	4434
February	1st to 10th	Night	38% 35% 5% 11% 11% 1	2280
	11th to 20th	Night	32% 35% 4 15% 11% 3	2219
	21st to end	Night	35% 35% 7% 11% 10% 2	1884
March	1st to 10th	Night	30% 34% 6% 12% 14% 4	2280
	11th to 20th	Night	32% 36% 7% 13% 8% 3	2236
	21st to end	Night	34% 37% 9% 13% 7% 1	2000
April	1st to 10th	Night	22% 36% 7% 18% 14% 3	1800
	11th to 20th	Night	24% 35% 6% 13% 17% 6%	1775
	21st to end	Night	28% 38% 6% 15% 11% 1	1800
May	1st to 10th	Night	30% 38% 8% 11% 11% 2	1648
	11th to 20th	Night	26% 39% 10% 11% 12% 1	1593
	21st to end	Night	18% 40% 12% 15% 13% 2	1710
June	1st to 10th	Night	20% 38% 8% 18% 15% 2	1440
	11th to 20th	Night	13% 38% 11% 20% 14% 4	1440
	21st to end	Night	15% 39% 12% 16% 12% 6%	1440
July	1st to 10th	Night	17% 40% 12% 16% 12% 3	1400
	11th to 20th	Night	20% 41% 11% 13% 9% 5%	1392
	21st to end	Night	19% 41% 13% 20% 7% 1	1564
August	1st to 10th	Night	18% 38% 11% 19% 14% 1	1778
	11th to 20th	Night	18% 38% 9% 19% 14% 2	1776
	21st to end	Night	18% 39% 7% 18% 13% 5%	1980
September	1st to 10th	Night	25% 38% 6% 12% 15% 4	1800
	11th to 20th	Night	23% 38% 5% 16% 15% 4	1922
	21st to end	Night	20% 36% 6% 14% 18% 6%	1980
October	1st to 10th	Night	17% 35% 5% 14% 22% 6%	1980
	11th to 20th	Night	23% 36% 6% 15% 15% 5%	2127
	21st to end	Night	27% 37% 4 13% 15% 4	2497
November	1st to 10th	Night	16% 39% 5% 17% 19% 4	2406
	11th to 20th	Night	23% 39% 5% 14% 14% 5%	2470
	21st to end	Night	25% 39% 5% 14% 14% 3	2470
December	1st to 10th	Night	30% 40% 6% 14% 9%	2470
	11th to 20th	Night	31% 33% 6% 16% 13% 1	3214
	21st to end	Night	42% 28% 7% 13% 8% 2	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	28% 17% 36% 16% 4	270
	11th to 20th	Day	29% 18% 36% 15% 3	270
	21st to end	Day	24% 21% 40% 12% 2	297
February	1st to 10th	Day	27% 21% 29% 18% 3 1	270
	11th to 20th	Day	31% 22% 36% 8% 3	270
	21st to end	Day	32% 17% 37% 9% 4	225
March	1st to 10th	Day	26% 18% 40% 13% 3 1	270
	11th to 20th	Day	26% 20% 36% 14% 3	299
	21st to end	Day	27% 16% 33% 18% 6% 1	470
April	1st to 10th	Day	20% 13% 33% 25% 9% 1	420
	11th to 20th	Day	23% 15% 26% 25% 8% 2	412
	21st to end	Day	23% 12% 30% 24% 8% 4	420
May	1st to 10th	Day	20% 14% 26% 27% 9% 4	423
	11th to 20th	Day	19% 7% 22% 30% 16% 6%	447
	21st to end	Day	10% 5% 20% 32% 21% 12%	515
June	1st to 10th	Day	11% 3 20% 28% 24% 13%	630
	11th to 20th	Day	4 3 18% 34% 29% 11%	630
	21st to end	Day	7% 2 22% 35% 23% 12%	630
July	1st to 10th	Day	10% 2 11% 27% 30% 20%	621
	11th to 20th	Day	9% 3 12% 26% 36% 14%	618
	21st to end	Day	7% 1 15% 29% 32% 16%	612
August	1st to 10th	Day	11% 2 10% 31% 32% 15%	446
	11th to 20th	Day	13% 3 10% 33% 32% 8%	439
	21st to end	Day	11% 1 8% 26% 35% 19%	495
September	1st to 10th	Day	10% 2 12% 27% 31% 17%	450
	11th to 20th	Day	11% 3 10% 28% 32% 17%	450
	21st to end	Day	15% 7% 16% 26% 24% 12%	450
October	1st to 10th	Day	11% 3 21% 33% 24% 7%	450
	11th to 20th	Day	13% 13% 31% 27% 12% 4	301
	21st to end	Day	28% 12% 27% 22% 10% 1	297
November	1st to 10th	Day	16% 6% 37% 26% 14% 1	270
	11th to 20th	Day	16% 17% 33% 25% 7% 1	270
	21st to end	Day	24% 11% 35% 21% 8% 1	270
December	1st to 10th	Day	21% 18% 33% 18% 9%	270
	11th to 20th	Day	24% 16% 32% 21% 7%	270
	21st to end	Day	25% 21% 38% 13% 3	297
January	1st to 10th	Night	25% 17% 32% 22% 4	950
	11th to 20th	Night	28% 17% 32% 20% 3	950
	21st to end	Night	23% 16% 37% 22% 2	986
February	1st to 10th	Night	26% 15% 35% 21% 3	760
	11th to 20th	Night	25% 17% 35% 21% 1	743
	21st to end	Night	29% 15% 36% 19% 1	628
March	1st to 10th	Night	23% 14% 32% 26% 5%	760
	11th to 20th	Night	23% 12% 35% 24% 5% 1	746
	21st to end	Night	23% 11% 30% 30% 7% 1	600
April	1st to 10th	Night	14% 10% 36% 31% 9%	540
	11th to 20th	Night	20% 9% 29% 30% 12% 1	533
	21st to end	Night	20% 8% 31% 30% 11% 1	540
May	1st to 10th	Night	20% 8% 31% 26% 14% 1	540
	11th to 20th	Night	13% 5% 21% 39% 19% 2	531
	21st to end	Night	8% 2 14% 42% 29% 4	584
June	1st to 10th	Night	13% 3 15% 34% 30% 5%	540
	11th to 20th	Night	6% 1 11% 44% 35% 3	540
	21st to end	Night	4 1 14% 41% 35% 5%	540
July	1st to 10th	Night	7% 1 10% 29% 42% 11%	525
	11th to 20th	Night	7% 2 10% 28% 46% 7%	522
	21st to end	Night	8% 2 9% 35% 38% 9%	591
August	1st to 10th	Night	7% 1 7% 34% 42% 10%	537
	11th to 20th	Night	8% 3 9% 38% 37% 5%	534
	21st to end	Night	9% 1 8% 30% 45% 7%	594
September	1st to 10th	Night	13% 1 11% 31% 39% 6%	540
	11th to 20th	Night	12% 2 11% 31% 37% 7%	662
	21st to end	Night	11% 4 18% 33% 30% 5%	720
October	1st to 10th	Night	12% 6% 17% 32% 29% 5%	720
	11th to 20th	Night	19% 6% 24% 33% 16% 2	720
	21st to end	Night	23% 7% 27% 29% 13% 1	792
November	1st to 10th	Night	15% 7% 28% 35% 14% 2	740
	11th to 20th	Night	15% 13% 33% 29% 9% 1	760
	21st to end	Night	24% 10% 28% 27% 11%	760
December	1st to 10th	Night	26% 12% 30% 26% 6% 1	760
	11th to 20th	Night	23% 10% 33% 27% 7%	883
	21st to end	Night	28% 13% 32% 24% 4	1045

Page generated at 2024-03-19 22:31:04. Version ac07

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