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 2024-11-04.

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	13% 7% 3 6% 4 4 4 4 6% 7% 42%	100948
	Night	14% 8% 2 6% 4 4 4 3 5% 7% 44%	98082
Transparency	Day	21% 47% 6% 14% 10% 2	104636
	Night	21% 47% 5% 14% 11% 2	102534
Seeing	Day	16% 9% 24% 25% 18% 8%	15383
	Night	18% 9% 25% 29% 17% 2	25148

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	13% 13% 5% 10% 5% 4 5% 3 4 5% 31%	2527
	11th to 20th	Day	19% 11% 3 7% 5% 6% 5% 2 3 4 35%	2576
	21st to end	Day	24% 12% 5% 6% 4 3 4 3 4 5% 29%	3228
February	1st to 10th	Day	19% 11% 3 6% 4 3 4 3 4 7% 36%	1900
	11th to 20th	Day	19% 10% 3 7% 4 4 3 2 5% 6% 36%	1848
	21st to end	Day	19% 12% 3 7% 5% 3 4 4 4 5% 34%	1570
March	1st to 10th	Day	20% 15% 3 8% 4 4 3 3 4 4 33%	3120
	11th to 20th	Day	14% 8% 3 6% 3 3 3 3 4 5% 48%	3269
	21st to end	Day	12% 8% 3 7% 5% 4 4 4 5% 7% 42%	4165
April	1st to 10th	Day	13% 6% 3 6% 5% 5% 4 3 5% 7% 44%	2280
	11th to 20th	Day	16% 7% 3 6% 4 4 4 3 6% 6% 41%	2254
	21st to end	Day	16% 7% 3 6% 5% 4 4 3 5% 6% 41%	2280
May	1st to 10th	Day	17% 8% 3 7% 5% 5% 5% 4 6% 9% 31%	4040
	11th to 20th	Day	18% 7% 2 6% 4 4 4 3 5% 8% 38%	4081
	21st to end	Day	10% 7% 3 7% 5% 5% 5% 5% 6% 8% 40%	4534
June	1st to 10th	Day	10% 5% 2 5% 5% 4 5% 4 7% 8% 46%	2660
	11th to 20th	Day	4 4 2 5% 5% 5% 5% 5% 8% 10% 48%	2660
	21st to end	Day	5% 4 2 5% 6% 5% 5% 5% 8% 10% 46%	2660
July	1st to 10th	Day	8% 5% 2 7% 6% 5% 5% 4 7% 10% 40%	4440
	11th to 20th	Day	7% 4 2 5% 4 5% 5% 4 8% 10% 46%	4440
	21st to end	Day	12% 10% 3 10% 6% 6% 4 5% 7% 9% 28%	4647
August	1st to 10th	Day	5% 4 1 4 4 4 5% 4 6% 9% 55%	3785
	11th to 20th	Day	8% 5% 2 6% 5% 5% 5% 4 7% 10% 42%	3729
	21st to end	Day	5% 3 2 4 3 3 4 3 6% 8% 59%	4180
September	1st to 10th	Day	11% 4 2 6% 5% 5% 5% 3 5% 8% 46%	2280
	11th to 20th	Day	11% 5% 2 5% 4 4 5% 3 4 7% 49%	2130
	21st to end	Day	11% 5% 2 5% 4 4 4 3 5% 7% 50%	2090
October	1st to 10th	Day	10% 4 2 4 3 3 4 2 4 7% 58%	2090
	11th to 20th	Day	13% 5% 2 5% 3 3 3 3 4 6% 53%	1932
	21st to end	Day	19% 8% 2 5% 4 2 2 3 3 5% 48%	1961
November	1st to 10th	Day	11% 5% 2 5% 3 3 2 3 5% 6% 55%	1699
	11th to 20th	Day	15% 8% 2 5% 3 3 4 2 4 6% 49%	1710
	21st to end	Day	18% 8% 2 6% 4 3 3 3 5% 5% 43%	1710
December	1st to 10th	Day	19% 10% 3 6% 4 3 4 4 5% 5% 36%	1710
	11th to 20th	Day	15% 11% 3 7% 4 4 4 4 6% 6% 34%	1980
	21st to end	Day	16% 12% 4 8% 5% 5% 4 4 5% 7% 30%	2783
January	1st to 10th	Night	19% 11% 3 7% 4 3 4 4 5% 6% 34%	4428
	11th to 20th	Night	17% 13% 4 10% 5% 5% 3 3 3 4 33%	4379
	21st to end	Night	25% 13% 4 6% 3 3 3 2 4 5% 32%	4434
February	1st to 10th	Night	21% 12% 4 8% 4 4 4 3 3 5% 33%	2280
	11th to 20th	Night	19% 9% 3 7% 4 3 3 3 4 5% 38%	2218
	21st to end	Night	22% 9% 3 6% 5% 4 3 3 5% 5% 35%	1884
March	1st to 10th	Night	23% 11% 3 7% 4 3 3 3 3 4 35%	3733
	11th to 20th	Night	14% 8% 3 5% 3 3 3 3 4 6% 47%	3717
	21st to end	Night	15% 9% 3 7% 4 4 3 3 4 7% 42%	3466
April	1st to 10th	Night	12% 6% 1 5% 4 4 3 4 5% 7% 49%	1900
	11th to 20th	Night	15% 7% 2 5% 3 3 3 3 6% 5% 47%	1875
	21st to end	Night	15% 8% 2 6% 4 4 4 4 6% 8% 40%	1900
May	1st to 10th	Night	18% 8% 2 6% 4 3 4 4 5% 7% 39%	2855
	11th to 20th	Night	14% 7% 2 6% 4 4 5% 3 7% 8% 42%	2812
	21st to end	Night	9% 6% 2 6% 5% 5% 5% 4 7% 10% 43%	3018
June	1st to 10th	Night	11% 5% 2 6% 4 3 4 4 5% 9% 46%	1520
	11th to 20th	Night	5% 3 2 4 3 2 3 5% 7% 11% 55%	1520
	21st to end	Night	3 2 1 4 4 4 6% 4 8% 13% 50%	1520
July	1st to 10th	Night	7% 4 2 7% 4 5% 5% 4 7% 10% 45%	2530
	11th to 20th	Night	5% 4 2 5% 4 4 4 4 5% 9% 55%	2530
	21st to end	Night	8% 8% 3 11% 7% 5% 6% 5% 6% 8% 33%	2894
August	1st to 10th	Night	4 3 1 4 4 3 4 3 5% 8% 61%	3144
	11th to 20th	Night	4 4 2 5% 4 4 5% 4 7% 10% 51%	3100
	21st to end	Night	4 3 1 3 3 2 3 4 6% 9% 61%	3476
September	1st to 10th	Night	10% 5% 2 5% 4 3 3 3 5% 7% 53%	1900
	11th to 20th	Night	9% 6% 2 6% 4 3 4 3 6% 7% 51%	2029
	21st to end	Night	10% 6% 2 5% 4 4 4 3 4 6% 54%	2090
October	1st to 10th	Night	9% 3 1 5% 3 3 3 2 4 6% 60%	2090
	11th to 20th	Night	15% 5% 2 4 3 3 4 3 4 5% 54%	2246
	21st to end	Night	18% 8% 2 4 3 3 3 3 4 5% 47%	2636
November	1st to 10th	Night	12% 6% 2 5% 3 3 2 2 4 6% 55%	2452
	11th to 20th	Night	13% 7% 2 5% 4 3 3 3 5% 6% 49%	2470
	21st to end	Night	19% 8% 2 4 4 3 3 3 3 5% 47%	2470
December	1st to 10th	Night	20% 12% 3 6% 3 3 4 4 5% 5% 35%	2470
	11th to 20th	Night	17% 10% 3 5% 3 4 4 3 4 5% 43%	3212
	21st to end	Night	17% 13% 4 8% 5% 5% 4 4 5% 6% 28%	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	34% 40% 4 15% 6% 1	2528
	11th to 20th	Day	31% 41% 5% 14% 8% 1	2576
	21st to end	Day	37% 40% 6% 10% 6% 1	3228
February	1st to 10th	Day	17% 64% 3 10% 4 1	1900
	11th to 20th	Day	19% 64% 3 9% 4 1	1858
	21st to end	Day	18% 64% 3 6% 5% 3	1570
March	1st to 10th	Day	38% 41% 2 8% 5% 6%	3120
	11th to 20th	Day	17% 41% 5% 20% 14% 3	3269
	21st to end	Day	21% 41% 7% 15% 14% 1	4165
April	1st to 10th	Day	18% 65% 3 8% 5% 1	2280
	11th to 20th	Day	18% 65% 4 7% 5% 1	2254
	21st to end	Day	15% 65% 4 10% 6% 1	2280
May	1st to 10th	Day	27% 44% 9% 12% 7%	4078
	11th to 20th	Day	28% 42% 7% 17% 7%	4085
	21st to end	Day	25% 42% 6% 10% 16% 1	4547
June	1st to 10th	Day	14% 65% 4 8% 7% 1	2660
	11th to 20th	Day	11% 66% 5% 10% 7% 1	2660
	21st to end	Day	12% 65% 9% 9% 5%	2660
July	1st to 10th	Day	25% 38% 10% 19% 6% 1	4371
	11th to 20th	Day	18% 37% 7% 31% 6%	4365
	21st to end	Day	39% 38% 6% 12% 5%	4499
August	1st to 10th	Day	14% 38% 10% 21% 17% 1	3773
	11th to 20th	Day	23% 40% 8% 17% 12% 1	3765
	21st to end	Day	13% 38% 7% 26% 16%	4179
September	1st to 10th	Day	10% 60% 5% 14% 8% 3	2280
	11th to 20th	Day	12% 60% 5% 12% 10% 1	2130
	21st to end	Day	15% 60% 4 13% 7% 1	2090
October	1st to 10th	Day	9% 36% 2 10% 36% 6%	3480
	11th to 20th	Day	11% 37% 4 18% 22% 9%	3185
	21st to end	Day	16% 36% 3 19% 22% 4	3212
November	1st to 10th	Day	16% 58% 4 10% 11% 1	1699
	11th to 20th	Day	15% 59% 3 9% 11% 3	1710
	21st to end	Day	20% 59% 3 11% 7% 1	1710
December	1st to 10th	Day	21% 60% 4 9% 5% 1	1710
	11th to 20th	Day	23% 50% 4 14% 7% 1	1977
	21st to end	Day	36% 39% 8% 10% 7%	2783
January	1st to 10th	Night	30% 39% 5% 18% 7% 1	4428
	11th to 20th	Night	32% 41% 3 13% 9% 2	4379
	21st to end	Night	36% 40% 5% 13% 6%	4434
February	1st to 10th	Night	20% 64% 3 8% 4 1	2280
	11th to 20th	Night	19% 64% 2 7% 7% 1	2219
	21st to end	Night	18% 64% 3 6% 8% 2	1884
March	1st to 10th	Night	37% 42% 3 6% 9% 4	3733
	11th to 20th	Night	18% 42% 6% 16% 10% 8%	3717
	21st to end	Night	24% 41% 5% 17% 13%	3466
April	1st to 10th	Night	14% 65% 4 10% 7%	1900
	11th to 20th	Night	16% 66% 4 7% 6% 1	1875
	21st to end	Night	14% 65% 3 9% 7% 1	1900
May	1st to 10th	Night	25% 44% 9% 15% 7%	2882
	11th to 20th	Night	24% 42% 9% 16% 8%	2813
	21st to end	Night	22% 44% 9% 16% 9%	3026
June	1st to 10th	Night	16% 65% 3 6% 8% 1	1520
	11th to 20th	Night	10% 66% 5% 9% 9% 1	1520
	21st to end	Night	9% 65% 7% 12% 6% 1	1520
July	1st to 10th	Night	23% 38% 9% 22% 7% 1	2490
	11th to 20th	Night	15% 36% 6% 30% 11% 1	2482
	21st to end	Night	36% 39% 7% 12% 5%	2802
August	1st to 10th	Night	13% 38% 9% 27% 14%	3132
	11th to 20th	Night	17% 39% 12% 21% 10% 1	3130
	21st to end	Night	10% 38% 6% 27% 19% 1	3476
September	1st to 10th	Night	9% 61% 4 15% 10% 2	1900
	11th to 20th	Night	10% 60% 4 13% 11% 1	2029
	21st to end	Night	13% 60% 4 13% 9% 1	2090
October	1st to 10th	Night	9% 37% 2 8% 35% 8%	3480
	11th to 20th	Night	9% 36% 2 13% 31% 9%	3732
	21st to end	Night	15% 36% 4 17% 20% 8%	4335
November	1st to 10th	Night	18% 57% 2 11% 10% 2	2452
	11th to 20th	Night	13% 59% 3 10% 12% 3	2470
	21st to end	Night	18% 60% 3 12% 8%	2470
December	1st to 10th	Night	22% 59% 3 8% 5% 2	2470
	11th to 20th	Night	19% 49% 4 14% 13% 1	3214
	21st to end	Night	36% 39% 6% 10% 6% 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% 37% 13% 3	299
	21st to end	Day	26% 16% 34% 17% 6% 1	506
April	1st to 10th	Day	21% 14% 32% 24% 8% 1	460
	11th to 20th	Day	24% 16% 26% 24% 8% 2	452
	21st to end	Day	22% 12% 32% 23% 8% 3	460
May	1st to 10th	Day	19% 14% 27% 27% 9% 3	463
	11th to 20th	Day	18% 7% 22% 30% 16% 6%	487
	21st to end	Day	9% 5% 23% 32% 20% 11%	561
June	1st to 10th	Day	11% 4 22% 28% 23% 13%	680
	11th to 20th	Day	4 3 18% 35% 29% 11%	680
	21st to end	Day	6% 3 22% 35% 22% 11%	680
July	1st to 10th	Day	10% 3 12% 28% 29% 19%	671
	11th to 20th	Day	9% 3 13% 27% 35% 14%	668
	21st to end	Day	8% 2 15% 30% 31% 15%	662
August	1st to 10th	Day	10% 2 11% 32% 31% 14%	486
	11th to 20th	Day	12% 3 14% 33% 30% 8%	479
	21st to end	Day	10% 1 9% 26% 34% 21%	539
September	1st to 10th	Day	11% 2 14% 26% 31% 16%	490
	11th to 20th	Day	11% 3 10% 28% 31% 17%	490
	21st to end	Day	17% 8% 18% 25% 22% 11%	490
October	1st to 10th	Day	11% 3 20% 33% 25% 8%	490
	11th to 20th	Day	13% 12% 31% 26% 14% 5%	332
	21st to end	Day	26% 12% 29% 22% 10% 1	330
November	1st to 10th	Day	15% 6% 37% 27% 13% 1	279
	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	22% 12% 30% 29% 6% 1	627
April	1st to 10th	Night	15% 11% 35% 31% 8%	570
	11th to 20th	Night	20% 9% 30% 29% 12% 1	563
	21st to end	Night	19% 8% 32% 29% 10% 1	570
May	1st to 10th	Night	20% 7% 31% 26% 15% 1	570
	11th to 20th	Night	13% 6% 20% 40% 19% 2	561
	21st to end	Night	8% 3 15% 42% 28% 4	617
June	1st to 10th	Night	13% 3 15% 35% 29% 4	570
	11th to 20th	Night	7% 1 12% 44% 34% 3	570
	21st to end	Night	4 1 14% 41% 35% 5%	570
July	1st to 10th	Night	7% 1 11% 30% 41% 10%	555
	11th to 20th	Night	7% 2 11% 29% 45% 6%	552
	21st to end	Night	8% 2 10% 35% 37% 8%	624
August	1st to 10th	Night	7% 1 8% 34% 41% 10%	567
	11th to 20th	Night	8% 3 10% 38% 36% 5%	564
	21st to end	Night	9% 1 8% 29% 45% 8%	627
September	1st to 10th	Night	12% 1 12% 31% 38% 5%	570
	11th to 20th	Night	13% 2 10% 31% 37% 7%	699
	21st to end	Night	13% 4 18% 32% 29% 5%	760
October	1st to 10th	Night	11% 5% 17% 33% 29% 5%	760
	11th to 20th	Night	18% 6% 23% 32% 18% 2	760
	21st to end	Night	22% 7% 28% 28% 13% 1	836
November	1st to 10th	Night	15% 7% 28% 35% 14% 2	755
	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 2024-11-01 21:47:51. Version ac07

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