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 2024-12-09.

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	7% 4 1 4 3 3 3 3 4 6% 62%	105262
	Night	6% 4 1 3 3 3 3 3 5% 7% 63%	103179
Transparency	Day	23% 4 8% 21% 28% 16%	105029
	Night	21% 4 8% 21% 27% 19%	103003
Seeing	Day	8% 5% 23% 32% 25% 7%	15210
	Night	8% 6% 30% 39% 17% 1	25211

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	9% 6% 2 4 3 2 3 2 4 5% 59%	2847
	11th to 20th	Day	4 4 1 4 2 2 3 2 4 5% 69%	2955
	21st to end	Day	8% 7% 2 6% 4 4 3 3 4 7% 53%	3487
February	1st to 10th	Day	7% 5% 1 5% 3 3 3 2 4 6% 61%	1900
	11th to 20th	Day	8% 5% 2 4 2 3 3 3 6% 6% 58%	1849
	21st to end	Day	9% 8% 2 3 3 3 2 2 3 5% 61%	1570
March	1st to 10th	Day	8% 5% 2 4 2 3 3 3 4 7% 60%	3130
	11th to 20th	Day	13% 5% 1 5% 3 3 3 3 5% 7% 52%	3378
	21st to end	Day	4 4 2 5% 4 4 4 4 5% 6% 56%	3905
April	1st to 10th	Day	5% 3 2 4 3 2 3 3 4 7% 63%	2280
	11th to 20th	Day	9% 4 2 4 3 3 3 4 4 4 60%	2251
	21st to end	Day	5% 4 1 4 3 3 3 3 5% 6% 65%	2280
May	1st to 10th	Day	11% 5% 1 3 2 2 3 2 4 5% 61%	4083
	11th to 20th	Day	11% 4 2 4 3 2 3 2 4 6% 58%	4082
	21st to end	Day	9% 4 2 4 3 3 4 3 5% 6% 58%	4489
June	1st to 10th	Day	4 3 1 4 3 3 4 3 6% 8% 60%	2470
	11th to 20th	Day	5% 3 1 3 3 3 3 2 4 7% 65%	2470
	21st to end	Day	4 3 1 3 3 3 3 4 5% 7% 66%	2470
July	1st to 10th	Day	9% 3 1 3 4 4 4 4 6% 8% 54%	4120
	11th to 20th	Day	3 2 1 3 3 3 3 3 5% 9% 64%	4120
	21st to end	Day	3 3 1 4 3 3 3 3 5% 10% 62%	4388
August	1st to 10th	Day	1 1 1 2 3 2 3 2 4 7% 73%	3784
	11th to 20th	Day	4 2 1 3 2 3 4 3 5% 8% 64%	3726
	21st to end	Day	4 3 1 4 3 4 4 3 5% 7% 61%	4180
September	1st to 10th	Day	11% 4 1 4 4 4 4 3 5% 7% 54%	2228
	11th to 20th	Day	10% 4 2 5% 4 4 4 4 5% 8% 51%	2090
	21st to end	Day	10% 3 1 4 3 3 3 2 4 4 63%	2090
October	1st to 10th	Day	3 2 1 2 2 2 2 2 3 4 77%	3480
	11th to 20th	Day	13% 3 1 2 2 2 2 2 3 4 66%	3458
	21st to end	Day	5% 2 1 2 2 1 2 1 3 4 76%	3261
November	1st to 10th	Day	8% 3 1 3 2 2 2 3 4 5% 66%	1763
	11th to 20th	Day	4 3 1 3 2 3 3 3 5% 6% 67%	1800
	21st to end	Day	10% 5% 1 4 2 3 2 2 4 6% 60%	1800
December	1st to 10th	Day	8% 4 2 4 3 3 3 3 5% 7% 59%	1782
	11th to 20th	Day	7% 3 2 4 3 4 4 3 4 6% 60%	2161
	21st to end	Day	8% 5% 2 4 2 2 2 2 3 4 66%	3135
January	1st to 10th	Night	5% 6% 2 5% 3 2 3 3 5% 6% 62%	4108
	11th to 20th	Night	4 3 1 3 2 2 3 2 5% 6% 68%	4042
	21st to end	Night	7% 7% 2 4 3 3 3 3 5% 7% 56%	4180
February	1st to 10th	Night	8% 5% 2 5% 3 3 2 2 5% 5% 60%	2280
	11th to 20th	Night	7% 6% 2 4 3 3 3 2 5% 7% 58%	2218
	21st to end	Night	7% 5% 2 3 3 4 4 3 4 5% 60%	1884
March	1st to 10th	Night	5% 7% 2 4 3 3 3 2 4 5% 62%	3734
	11th to 20th	Night	10% 5% 1 3 3 3 3 3 5% 7% 57%	3583
	21st to end	Night	4 5% 2 4 3 3 4 4 6% 7% 58%	3712
April	1st to 10th	Night	5% 4 1 3 3 2 3 3 4 7% 65%	1900
	11th to 20th	Night	8% 3 1 3 3 2 3 3 5% 7% 62%	1877
	21st to end	Night	5% 3 1 3 3 3 3 3 5% 5% 67%	1900
May	1st to 10th	Night	11% 4 2 3 2 2 3 2 3 5% 63%	2883
	11th to 20th	Night	8% 4 1 4 3 3 3 3 5% 6% 61%	2823
	21st to end	Night	7% 4 1 3 2 2 3 3 5% 6% 63%	3098
June	1st to 10th	Night	5% 3 1 4 2 2 3 3 6% 10% 62%	1710
	11th to 20th	Night	1 2 1 3 3 4 4 4 7% 11% 61%	1710
	21st to end	Night	4 2 1 3 2 3 3 3 6% 8% 63%	1710
July	1st to 10th	Night	4 3 2 5% 4 4 4 4 7% 11% 52%	2850
	11th to 20th	Night	2 2 1 3 2 3 4 3 7% 12% 60%	2850
	21st to end	Night	4 2 1 3 3 3 3 3 6% 9% 64%	3158
August	1st to 10th	Night	2 2 1 2 2 2 2 2 5% 9% 70%	3155
	11th to 20th	Night	3 2 1 3 3 3 4 3 6% 9% 61%	3113
	21st to end	Night	4 2 1 3 2 3 3 3 5% 9% 65%	3487
September	1st to 10th	Night	9% 4 1 4 4 3 4 3 6% 7% 55%	1951
	11th to 20th	Night	9% 4 2 4 3 3 4 4 6% 8% 53%	2090
	21st to end	Night	8% 3 2 4 2 2 4 2 4 6% 64%	2090
October	1st to 10th	Night	3 1 1 2 1 2 2 1 3 4 79%	3480
	11th to 20th	Night	13% 3 1 2 2 2 2 1 3 4 68%	3460
	21st to end	Night	4 2 1 1 1 2 1 2 2 4 79%	4259
November	1st to 10th	Night	7% 3 1 2 2 2 3 2 4 5% 69%	2535
	11th to 20th	Night	3 2 1 3 2 3 2 3 4 7% 69%	2600
	21st to end	Night	8% 5% 1 3 3 2 3 3 4 7% 61%	2600
December	1st to 10th	Night	8% 4 2 4 3 3 3 3 5% 5% 60%	2581
	11th to 20th	Night	6% 5% 2 4 3 3 3 3 4 6% 60%	3036
	21st to end	Night	5% 4 2 4 4 3 3 3 3 5% 64%	4532

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% 3 5% 19% 28% 18%	2848
	11th to 20th	Day	18% 4 8% 19% 37% 15%	2955
	21st to end	Day	32% 3 6% 18% 30% 10%	3487
February	1st to 10th	Day	26% 2 6% 19% 27% 20%	1900
	11th to 20th	Day	27% 3 6% 21% 25% 18%	1859
	21st to end	Day	29% 2 4 11% 31% 22%	1570
March	1st to 10th	Day	24% 2 5% 11% 28% 29%	3130
	11th to 20th	Day	33% 5% 8% 17% 26% 11%	3378
	21st to end	Day	26% 4 8% 17% 27% 17%	3905
April	1st to 10th	Day	20% 4 7% 17% 26% 26%	2280
	11th to 20th	Day	27% 3 7% 14% 25% 24%	2254
	21st to end	Day	20% 4 6% 20% 29% 20%	2280
May	1st to 10th	Day	27% 4 6% 15% 21% 28%	4083
	11th to 20th	Day	28% 5% 8% 18% 21% 20%	4086
	21st to end	Day	26% 5% 8% 17% 19% 25%	4489
June	1st to 10th	Day	21% 5% 14% 30% 20% 10%	2470
	11th to 20th	Day	19% 4 9% 24% 28% 16%	2470
	21st to end	Day	19% 5% 11% 26% 27% 13%	2470
July	1st to 10th	Day	27% 5% 13% 27% 20% 8%	4056
	11th to 20th	Day	18% 4 12% 32% 30% 5%	4051
	21st to end	Day	18% 4 11% 29% 29% 7%	4249
August	1st to 10th	Day	12% 3 10% 27% 39% 9%	3772
	11th to 20th	Day	19% 5% 9% 28% 31% 9%	3762
	21st to end	Day	22% 5% 13% 27% 26% 7%	4179
September	1st to 10th	Day	31% 4 10% 20% 24% 11%	2228
	11th to 20th	Day	32% 5% 10% 23% 23% 6%	2090
	21st to end	Day	25% 3 6% 19% 33% 14%	2090
October	1st to 10th	Day	14% 3 6% 13% 30% 34%	3480
	11th to 20th	Day	25% 2 5% 18% 24% 26%	3458
	21st to end	Day	14% 2 3 24% 40% 17%	3261
November	1st to 10th	Day	22% 2 7% 19% 28% 22%	1763
	11th to 20th	Day	18% 3 7% 20% 34% 19%	1800
	21st to end	Day	27% 2 5% 16% 31% 20%	1800
December	1st to 10th	Day	27% 3 6% 23% 28% 13%	1782
	11th to 20th	Day	26% 3 9% 20% 24% 17%	2159
	21st to end	Day	24% 2 5% 18% 33% 18%	3135
January	1st to 10th	Night	24% 3 6% 22% 31% 15%	4108
	11th to 20th	Night	16% 4 12% 19% 32% 17%	4042
	21st to end	Night	27% 5% 6% 19% 29% 14%	4180
February	1st to 10th	Night	26% 2 7% 15% 26% 23%	2280
	11th to 20th	Night	28% 2 6% 19% 23% 22%	2218
	21st to end	Night	27% 3 5% 12% 25% 29%	1884
March	1st to 10th	Night	24% 3 6% 11% 22% 35%	3734
	11th to 20th	Night	27% 4 11% 20% 20% 19%	3583
	21st to end	Night	23% 4 8% 24% 25% 16%	3712
April	1st to 10th	Night	21% 4 7% 18% 24% 26%	1900
	11th to 20th	Night	22% 3 9% 19% 23% 24%	1877
	21st to end	Night	18% 4 9% 22% 27% 19%	1900
May	1st to 10th	Night	25% 4 7% 21% 15% 28%	2883
	11th to 20th	Night	24% 6% 11% 19% 19% 21%	2824
	21st to end	Night	20% 6% 11% 16% 16% 31%	3099
June	1st to 10th	Night	19% 5% 15% 31% 20% 10%	1710
	11th to 20th	Night	16% 6% 12% 24% 28% 14%	1710
	21st to end	Night	18% 4 12% 27% 24% 15%	1710
July	1st to 10th	Night	25% 5% 13% 35% 18% 3	2805
	11th to 20th	Night	17% 4 12% 30% 30% 7%	2796
	21st to end	Night	17% 4 10% 26% 35% 8%	3059
August	1st to 10th	Night	13% 3 7% 26% 39% 13%	3144
	11th to 20th	Night	18% 4 11% 25% 33% 9%	3143
	21st to end	Night	17% 5% 16% 26% 28% 7%	3487
September	1st to 10th	Night	27% 5% 10% 21% 25% 13%	1951
	11th to 20th	Night	27% 6% 12% 20% 24% 10%	2090
	21st to end	Night	22% 4 7% 21% 27% 20%	2090
October	1st to 10th	Night	11% 3 7% 13% 24% 42%	3480
	11th to 20th	Night	23% 2 4 19% 23% 29%	3460
	21st to end	Night	12% 2 3 25% 37% 20%	4259
November	1st to 10th	Night	18% 2 6% 22% 29% 22%	2535
	11th to 20th	Night	16% 3 7% 17% 36% 21%	2600
	21st to end	Night	25% 2 6% 16% 31% 21%	2600
December	1st to 10th	Night	26% 2 6% 20% 28% 17%	2581
	11th to 20th	Night	27% 3 5% 19% 28% 18%	3037
	21st to end	Night	25% 2 5% 19% 32% 18%	4532

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% 9% 41% 29% 11% 1	270
	11th to 20th	Day	9% 12% 33% 33% 11% 3	270
	21st to end	Day	10% 11% 32% 34% 12% 1	297
February	1st to 10th	Day	10% 6% 36% 37% 10% 1	270
	11th to 20th	Day	10% 9% 42% 28% 10% 1	270
	21st to end	Day	18% 11% 42% 24% 4 1	225
March	1st to 10th	Day	11% 4 42% 34% 9%	270
	11th to 20th	Day	14% 9% 36% 29% 11% 2	270
	21st to end	Day	8% 12% 40% 29% 11% 1	350
April	1st to 10th	Day	8% 11% 45% 27% 8%	460
	11th to 20th	Day	12% 14% 41% 27% 5% 1	452
	21st to end	Day	7% 11% 41% 30% 10% 1	460
May	1st to 10th	Day	9% 10% 36% 33% 11% 1	629
	11th to 20th	Day	11% 4 31% 33% 16% 4	675
	21st to end	Day	10% 5% 31% 35% 17% 2	734
June	1st to 10th	Day	5% 3 16% 47% 25% 5%	680
	11th to 20th	Day	5% 1 20% 44% 26% 4	680
	21st to end	Day	3 2 10% 39% 38% 7%	680
July	1st to 10th	Day	6% 2 6% 32% 39% 16%	671
	11th to 20th	Day	2 2 4 35% 44% 13%	668
	21st to end	Day	2 1 3 25% 49% 21%	697
August	1st to 10th	Day	2 1 3 29% 49% 16%	487
	11th to 20th	Day	5% 1 5% 29% 44% 16%	477
	21st to end	Day	4 2 4 28% 44% 19%	539
September	1st to 10th	Day	9% 1 4 30% 39% 17%	438
	11th to 20th	Day	4 1 9% 33% 36% 17%	300
	21st to end	Day	14% 3 8% 22% 37% 17%	300
October	1st to 10th	Day	4 4 16% 30% 38% 9%	300
	11th to 20th	Day	9% 2 31% 29% 25% 4	300
	21st to end	Day	13% 7% 23% 33% 19% 5%	330
November	1st to 10th	Day	15% 6% 28% 27% 19% 4	300
	11th to 20th	Day	10% 9% 24% 32% 22% 4	300
	21st to end	Day	14% 12% 33% 21% 16% 4	300
December	1st to 10th	Day	12% 7% 30% 35% 15% 1	294
	11th to 20th	Day	6% 10% 31% 40% 11% 1	270
	21st to end	Day	12% 12% 39% 28% 9% 1	297
January	1st to 10th	Night	8% 7% 36% 38% 10%	950
	11th to 20th	Night	9% 8% 34% 40% 8% 1	898
	21st to end	Night	8% 7% 37% 39% 9%	836
February	1st to 10th	Night	10% 8% 39% 34% 8% 1	760
	11th to 20th	Night	9% 11% 41% 31% 7%	744
	21st to end	Night	10% 14% 42% 30% 5%	628
March	1st to 10th	Night	10% 10% 41% 35% 4	760
	11th to 20th	Night	12% 11% 40% 30% 7%	634
	21st to end	Night	7% 13% 43% 32% 5%	627
April	1st to 10th	Night	6% 10% 48% 31% 4	570
	11th to 20th	Night	9% 10% 47% 32% 2	563
	21st to end	Night	7% 10% 47% 30% 6%	570
May	1st to 10th	Night	9% 7% 41% 39% 5%	570
	11th to 20th	Night	9% 6% 35% 38% 12% 1	561
	21st to end	Night	6% 3 41% 37% 12% 1	617
June	1st to 10th	Night	6% 2 27% 47% 18%	570
	11th to 20th	Night	2 2 34% 50% 11%	570
	21st to end	Night	4 2 21% 48% 25%	570
July	1st to 10th	Night	4 2 9% 47% 35% 3	555
	11th to 20th	Night	3 1 9% 51% 35% 2	552
	21st to end	Night	1 1 4 41% 51% 2	624
August	1st to 10th	Night	2 1 6% 44% 46% 1	567
	11th to 20th	Night	5% 2 5% 43% 42% 2	564
	21st to end	Night	5% 1 4 42% 45% 3	627
September	1st to 10th	Night	10% 1 6% 42% 38% 3	570
	11th to 20th	Night	11% 1 10% 44% 34% 2	570
	21st to end	Night	9% 2 13% 46% 29% 2	570
October	1st to 10th	Night	5% 3 23% 45% 23% 1	570
	11th to 20th	Night	10% 5% 28% 43% 13% 1	570
	21st to end	Night	9% 7% 27% 35% 19% 2	911
November	1st to 10th	Night	8% 4 29% 41% 17% 1	975
	11th to 20th	Night	4 6% 31% 44% 14% 1	1000
	21st to end	Night	11% 7% 32% 37% 13% 1	1000
December	1st to 10th	Night	11% 6% 33% 39% 11%	993
	11th to 20th	Night	10% 7% 37% 38% 8%	950
	21st to end	Night	10% 9% 36% 35% 10% 1	1045

Page generated at 2024-12-06 02:54:52. Version ac07

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