Camp Post
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Post clear sky chart from 2005-11-06 to 2026-04-02.

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	6% 4 1 4 3 3 3 3 5% 6% 62%	140383
	Night	5% 4 1 3 3 3 3 3 5% 7% 63%	138875
Transparency	Day	23% 3 8% 21% 28% 17%	135475
	Night	21% 3 8% 21% 28% 20%	134793
Seeing	Day	8% 6% 24% 32% 24% 6%	16904
	Night	8% 6% 30% 39% 16% 1	27007

By Month

Percentage Cloud Cover SW (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	7% 5% 3 4 3 3 3 3 5% 5% 60%	5287
	11th to 20th	Day	2 2 1 3 2 2 3 2 4 5% 74%	5527
	21st to end	Day	10% 5% 2 4 4 4 4 4 5% 6% 53%	6468
February	1st to 10th	Day	8% 5% 1 5% 3 3 3 2 4 6% 62%	2100
	11th to 20th	Day	7% 6% 2 4 3 4 3 3 6% 6% 57%	2049
	21st to end	Day	8% 7% 2 3 3 2 2 2 2 5% 63%	1730
March	1st to 10th	Day	6% 5% 1 4 2 2 3 3 4 6% 63%	4600
	11th to 20th	Day	9% 4 1 4 3 3 3 3 5% 8% 57%	4946
	21st to end	Day	3 3 2 4 4 4 4 4 5% 6% 61%	5721
April	1st to 10th	Day	6% 3 2 4 3 2 3 3 4 7% 63%	2413
	11th to 20th	Day	9% 4 2 4 3 3 3 4 4 4 61%	2371
	21st to end	Day	5% 3 1 4 3 3 3 3 5% 6% 65%	2400
May	1st to 10th	Day	12% 5% 2 3 2 2 3 3 4 6% 57%	5849
	11th to 20th	Day	8% 4 1 4 3 2 3 2 4 6% 61%	5862
	21st to end	Day	10% 4 2 4 3 3 4 3 5% 6% 54%	6446
June	1st to 10th	Day	4 3 1 4 3 3 4 4 6% 8% 60%	2600
	11th to 20th	Day	5% 3 1 3 3 3 3 2 5% 7% 65%	2600
	21st to end	Day	4 3 1 4 3 3 3 4 5% 7% 64%	2600
July	1st to 10th	Day	11% 4 2 5% 4 4 4 4 6% 7% 50%	5899
	11th to 20th	Day	3 3 1 4 3 3 3 3 5% 8% 63%	5900
	21st to end	Day	2 2 1 3 3 3 3 3 5% 9% 66%	6318
August	1st to 10th	Day	2 1 1 3 2 2 3 2 5% 8% 72%	5348
	11th to 20th	Day	3 2 1 4 3 4 4 4 7% 10% 57%	5366
	21st to end	Day	4 3 1 4 3 4 4 3 5% 8% 61%	5984
September	1st to 10th	Day	11% 4 1 4 4 4 3 3 5% 7% 54%	2345
	11th to 20th	Day	9% 4 2 5% 4 4 4 4 5% 7% 51%	2200
	21st to end	Day	10% 3 1 4 3 3 3 2 4 5% 63%	2200
October	1st to 10th	Day	3 2 1 3 2 2 2 2 3 4 76%	3590
	11th to 20th	Day	13% 3 1 2 2 2 2 2 3 4 65%	3568
	21st to end	Day	5% 2 1 2 1 1 2 2 3 4 76%	3365
November	1st to 10th	Day	8% 3 1 3 2 2 2 2 4 5% 68%	1853
	11th to 20th	Day	4 3 1 3 2 2 3 3 4 7% 67%	1890
	21st to end	Day	10% 5% 1 4 2 3 2 2 4 6% 60%	1890
December	1st to 10th	Day	7% 5% 2 6% 3 3 3 3 4 6% 57%	3030
	11th to 20th	Day	5% 2 1 4 3 3 3 2 3 5% 68%	3481
	21st to end	Day	6% 5% 2 4 2 2 2 2 3 4 70%	4587
January	1st to 10th	Night	4 5% 2 5% 3 3 3 3 5% 5% 61%	7634
	11th to 20th	Night	2 3 1 2 2 1 2 2 4 6% 75%	7518
	21st to end	Night	9% 7% 2 5% 3 3 3 2 5% 7% 54%	7746
February	1st to 10th	Night	7% 5% 2 4 2 3 2 2 4 5% 63%	2520
	11th to 20th	Night	7% 6% 2 4 3 3 3 3 4 7% 58%	2458
	21st to end	Night	6% 5% 2 3 3 4 4 3 4 5% 61%	2076
March	1st to 10th	Night	4 5% 2 3 3 3 3 3 4 6% 64%	5494
	11th to 20th	Night	7% 3 1 3 2 3 3 3 4 7% 65%	5238
	21st to end	Night	3 4 2 3 3 3 4 3 6% 7% 63%	5441
April	1st to 10th	Night	6% 4 1 3 2 2 3 3 4 6% 64%	2010
	11th to 20th	Night	8% 3 1 3 3 2 3 3 4 7% 63%	1977
	21st to end	Night	6% 3 1 3 3 3 3 3 5% 5% 66%	2000
May	1st to 10th	Night	12% 3 2 3 2 2 3 2 3 5% 62%	4127
	11th to 20th	Night	6% 3 1 3 3 3 3 3 5% 7% 64%	4053
	21st to end	Night	9% 4 1 3 3 3 4 3 5% 6% 59%	4451
June	1st to 10th	Night	5% 3 1 4 2 3 3 3 6% 10% 61%	1800
	11th to 20th	Night	2 2 1 3 3 4 4 3 7% 11% 61%	1800
	21st to end	Night	4 2 1 3 3 4 3 4 6% 9% 61%	1800
July	1st to 10th	Night	7% 5% 2 6% 4 4 4 4 7% 11% 45%	4080
	11th to 20th	Night	2 2 1 3 2 3 3 3 6% 11% 64%	4080
	21st to end	Night	3 2 1 3 3 3 4 3 6% 10% 64%	4538
August	1st to 10th	Night	2 2 1 3 2 2 3 3 5% 9% 70%	4464
	11th to 20th	Night	3 2 1 4 4 4 5% 4 8% 12% 55%	4483
	21st to end	Night	5% 3 1 4 3 3 3 4 6% 9% 60%	4993
September	1st to 10th	Night	9% 4 1 4 3 3 4 3 6% 7% 55%	2054
	11th to 20th	Night	9% 4 2 4 3 3 4 4 6% 8% 53%	2200
	21st to end	Night	8% 3 2 4 3 2 4 3 5% 5% 64%	2200
October	1st to 10th	Night	3 1 1 2 2 2 2 2 3 4 79%	3590
	11th to 20th	Night	12% 3 1 2 2 2 2 1 3 4 68%	3570
	21st to end	Night	4 2 1 2 1 2 1 2 2 4 79%	4396
November	1st to 10th	Night	7% 3 1 2 2 2 3 2 4 5% 70%	2665
	11th to 20th	Night	3 2 1 3 2 3 2 3 4 7% 69%	2730
	21st to end	Night	8% 5% 1 3 3 2 3 3 4 7% 62%	2730
December	1st to 10th	Night	7% 5% 2 5% 3 3 3 3 4 5% 59%	4380
	11th to 20th	Night	4 4 2 3 2 3 3 3 4 6% 67%	4946
	21st to end	Night	4 5% 2 4 3 3 3 2 3 5% 67%	6633

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	26% 2 5% 20% 31% 16%	5290
	11th to 20th	Day	13% 3 5% 20% 37% 22%	5527
	21st to end	Day	32% 3 5% 15% 30% 15%	6468
February	1st to 10th	Day	25% 2 5% 18% 29% 21%	2100
	11th to 20th	Day	28% 3 6% 22% 25% 17%	2059
	21st to end	Day	27% 2 4 12% 33% 23%	1730
March	1st to 10th	Day	23% 2 4 10% 27% 34%	4600
	11th to 20th	Day	27% 4 6% 12% 24% 28%	4946
	21st to end	Day	22% 3 8% 18% 29% 20%	5721
April	1st to 10th	Day	21% 4 7% 17% 27% 25%	2413
	11th to 20th	Day	27% 3 6% 15% 25% 24%	2374
	21st to end	Day	21% 4 7% 21% 29% 19%	2400
May	1st to 10th	Day	29% 4 5% 18% 24% 20%	5849
	11th to 20th	Day	25% 4 6% 14% 21% 30%	5866
	21st to end	Day	30% 4 9% 21% 16% 20%	6447
June	1st to 10th	Day	21% 5% 14% 30% 20% 10%	2600
	11th to 20th	Day	18% 4 10% 24% 29% 15%	2600
	21st to end	Day	20% 5% 11% 26% 26% 12%	2600
July	1st to 10th	Day	33% 5% 12% 24% 21% 6%	5836
	11th to 20th	Day	19% 4 14% 33% 27% 4	5831
	21st to end	Day	15% 4 17% 33% 26% 5%	6136
August	1st to 10th	Day	12% 3 10% 27% 39% 9%	3892
	11th to 20th	Day	19% 5% 9% 28% 31% 9%	3882
	21st to end	Day	22% 5% 13% 28% 25% 7%	4311
September	1st to 10th	Day	31% 4 10% 21% 24% 11%	2345
	11th to 20th	Day	32% 5% 10% 24% 23% 6%	2200
	21st to end	Day	25% 3 6% 19% 33% 14%	2200
October	1st to 10th	Day	14% 3 6% 13% 30% 33%	3590
	11th to 20th	Day	25% 2 5% 18% 24% 26%	3568
	21st to end	Day	14% 2 3 24% 40% 17%	3365
November	1st to 10th	Day	21% 2 7% 18% 29% 23%	1853
	11th to 20th	Day	18% 3 6% 20% 34% 19%	1890
	21st to end	Day	27% 2 5% 16% 31% 19%	1890
December	1st to 10th	Day	29% 3 4 23% 27% 13%	3030
	11th to 20th	Day	21% 2 6% 18% 31% 21%	3479
	21st to end	Day	21% 2 4 21% 35% 18%	4587
January	1st to 10th	Night	25% 2 4 23% 33% 12%	7635
	11th to 20th	Night	12% 2 7% 19% 38% 21%	7518
	21st to end	Night	31% 3 4 17% 29% 16%	7746
February	1st to 10th	Night	25% 2 6% 15% 28% 24%	2520
	11th to 20th	Night	28% 2 6% 20% 23% 20%	2458
	21st to end	Night	25% 3 4 12% 26% 29%	2076
March	1st to 10th	Night	21% 3 4 11% 23% 38%	5494
	11th to 20th	Night	21% 3 7% 14% 16% 39%	5238
	21st to end	Night	19% 3 9% 20% 27% 22%	5441
April	1st to 10th	Night	21% 4 6% 18% 24% 26%	2010
	11th to 20th	Night	22% 3 9% 18% 24% 24%	1977
	21st to end	Night	20% 4 9% 22% 27% 18%	2000
May	1st to 10th	Night	25% 3 9% 25% 17% 21%	4126
	11th to 20th	Night	21% 5% 8% 14% 21% 32%	4054
	21st to end	Night	25% 5% 12% 17% 14% 26%	4452
June	1st to 10th	Night	19% 6% 15% 31% 20% 9%	1800
	11th to 20th	Night	16% 6% 12% 24% 28% 13%	1800
	21st to end	Night	19% 4 12% 27% 24% 14%	1800
July	1st to 10th	Night	32% 5% 13% 31% 17% 2	4035
	11th to 20th	Night	16% 3 14% 34% 28% 6%	4026
	21st to end	Night	16% 4 15% 28% 29% 8%	4408
August	1st to 10th	Night	13% 3 6% 26% 39% 13%	3244
	11th to 20th	Night	19% 4 11% 25% 33% 8%	3243
	21st to end	Night	17% 5% 17% 26% 28% 7%	3597
September	1st to 10th	Night	27% 5% 10% 22% 25% 12%	2054
	11th to 20th	Night	27% 6% 12% 21% 24% 10%	2200
	21st to end	Night	22% 4 7% 21% 27% 19%	2200
October	1st to 10th	Night	11% 3 7% 13% 24% 41%	3590
	11th to 20th	Night	23% 2 4 20% 23% 29%	3570
	21st to end	Night	12% 2 3 25% 37% 21%	4396
November	1st to 10th	Night	18% 2 6% 21% 30% 23%	2665
	11th to 20th	Night	16% 3 6% 17% 37% 21%	2730
	21st to end	Night	25% 2 6% 17% 31% 20%	2730
December	1st to 10th	Night	28% 3 4 20% 30% 15%	4380
	11th to 20th	Night	20% 2 4 17% 35% 21%	4947
	21st to end	Night	23% 2 3 24% 31% 17%	6633

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	9% 10% 41% 28% 11% 1	330
	11th to 20th	Day	8% 14% 33% 33% 10% 2	330
	21st to end	Day	11% 11% 33% 33% 10% 1	363
February	1st to 10th	Day	10% 6% 38% 34% 10% 1	330
	11th to 20th	Day	10% 10% 43% 27% 9% 1	330
	21st to end	Day	15% 10% 41% 27% 6% 1	273
March	1st to 10th	Day	12% 6% 42% 32% 7%	330
	11th to 20th	Day	14% 9% 38% 27% 10% 2	330
	21st to end	Day	7% 11% 39% 31% 11% 1	422
April	1st to 10th	Day	10% 11% 43% 28% 8%	505
	11th to 20th	Day	11% 14% 43% 26% 5% 1	492
	21st to end	Day	8% 11% 42% 29% 9% 1	500
May	1st to 10th	Day	10% 9% 37% 32% 11% 1	678
	11th to 20th	Day	11% 6% 31% 32% 15% 4	725
	21st to end	Day	10% 5% 32% 35% 16% 2	789
June	1st to 10th	Day	5% 3 17% 47% 24% 4	730
	11th to 20th	Day	5% 1 21% 43% 26% 4	730
	21st to end	Day	4 2 12% 39% 36% 7%	730
July	1st to 10th	Day	7% 2 5% 32% 38% 15%	721
	11th to 20th	Day	2 2 4 35% 44% 13%	718
	21st to end	Day	2 1 3 26% 48% 20%	750
August	1st to 10th	Day	2 1 3 30% 49% 14%	527
	11th to 20th	Day	5% 2 5% 31% 43% 15%	517
	21st to end	Day	4 2 4 29% 44% 18%	583
September	1st to 10th	Day	9% 1 4 32% 37% 16%	475
	11th to 20th	Day	4 1 11% 34% 35% 15%	330
	21st to end	Day	13% 3 8% 25% 35% 15%	330
October	1st to 10th	Day	3 4 17% 30% 37% 9%	330
	11th to 20th	Day	9% 3 31% 28% 25% 3	330
	21st to end	Day	13% 7% 23% 33% 19% 5%	363
November	1st to 10th	Day	14% 7% 28% 28% 20% 4	330
	11th to 20th	Day	10% 8% 23% 33% 22% 3	330
	21st to end	Day	15% 12% 34% 20% 15% 4	330
December	1st to 10th	Day	10% 7% 35% 32% 14% 1	330
	11th to 20th	Day	5% 9% 33% 40% 12% 2	330
	21st to end	Day	12% 12% 36% 28% 10% 1	363
January	1st to 10th	Night	8% 8% 36% 38% 10%	1050
	11th to 20th	Night	8% 8% 35% 40% 8% 1	992
	21st to end	Night	9% 8% 39% 36% 8%	924
February	1st to 10th	Night	9% 8% 40% 34% 8% 1	840
	11th to 20th	Night	10% 11% 42% 30% 7%	824
	21st to end	Night	9% 13% 42% 31% 5%	692
March	1st to 10th	Night	10% 10% 42% 34% 4	840
	11th to 20th	Night	12% 11% 41% 29% 6%	700
	21st to end	Night	7% 12% 44% 32% 5%	693
April	1st to 10th	Night	8% 10% 47% 32% 3	603
	11th to 20th	Night	9% 11% 47% 31% 2	593
	21st to end	Night	7% 10% 47% 30% 6%	600
May	1st to 10th	Night	9% 7% 40% 39% 5%	600
	11th to 20th	Night	8% 7% 36% 38% 11% 1	591
	21st to end	Night	6% 4 40% 38% 12% 1	650
June	1st to 10th	Night	6% 2 27% 48% 17%	600
	11th to 20th	Night	2 2 34% 51% 11%	600
	21st to end	Night	5% 2 22% 47% 25%	600
July	1st to 10th	Night	6% 2 8% 46% 35% 2	585
	11th to 20th	Night	3 1 9% 52% 34% 2	582
	21st to end	Night	1 1 5% 41% 50% 2	657
August	1st to 10th	Night	2 1 6% 45% 45% 1	597
	11th to 20th	Night	5% 2 6% 43% 42% 2	594
	21st to end	Night	5% 1 5% 43% 44% 3	660
September	1st to 10th	Night	11% 1 7% 43% 36% 3	600
	11th to 20th	Night	10% 1 10% 46% 33% 2	600
	21st to end	Night	9% 2 14% 46% 28% 2	600
October	1st to 10th	Night	5% 3 23% 46% 23% 1	600
	11th to 20th	Night	10% 5% 28% 44% 13% 1	600
	21st to end	Night	9% 8% 28% 35% 19% 2	960
November	1st to 10th	Night	8% 4 29% 42% 16% 1	1025
	11th to 20th	Night	4 6% 30% 45% 13% 1	1050
	21st to end	Night	11% 7% 32% 37% 12% 1	1050
December	1st to 10th	Night	10% 6% 34% 38% 10%	1050
	11th to 20th	Night	9% 8% 37% 37% 8%	1050
	21st to end	Night	10% 8% 37% 35% 10% 1	1155

Page generated at 2026-03-30 01:18:45. Version ac07

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