Camp Crooked Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Crooked Creek clear sky chart from 2005-11-06 to 2024-01-13.

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 6% 5% 3 5% 5% 6% 7% 39%	75057
	Night	14% 8% 3 6% 5% 3 4 4 5% 7% 41%	74665
Transparency	Day	43% 6% 11% 22% 15% 2	74770
	Night	43% 5% 10% 22% 16% 3	74472
Seeing	Day	17% 11% 25% 23% 17% 7%	14145
	Night	18% 9% 25% 29% 17% 2	23975

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	18% 9% 3 8% 6% 2 4 4 5% 6% 34%	1517
	11th to 20th	Day	22% 11% 6% 8% 6% 3 3 3 5% 5% 27%	1528
	21st to end	Day	15% 10% 4 7% 6% 3 4 5% 5% 6% 34%	1814
February	1st to 10th	Day	20% 11% 5% 8% 4 3 4 3 3 6% 33%	1800
	11th to 20th	Day	19% 9% 4 6% 6% 4 3 4 5% 7% 33%	1748
	21st to end	Day	18% 11% 5% 7% 5% 2 5% 4 6% 5% 30%	1480
March	1st to 10th	Day	19% 9% 3 5% 4 3 4 4 5% 6% 39%	1800
	11th to 20th	Day	19% 9% 3 6% 5% 3 4 5% 5% 7% 32%	1939
	21st to end	Day	18% 9% 4 8% 6% 3 5% 4 5% 6% 31%	2219
April	1st to 10th	Day	12% 7% 3 5% 6% 3 5% 5% 6% 8% 42%	2160
	11th to 20th	Day	16% 9% 3 6% 5% 3 4 4 5% 6% 40%	2134
	21st to end	Day	18% 7% 2 5% 6% 3 4 4 5% 6% 38%	2302
May	1st to 10th	Day	17% 7% 3 6% 5% 3 5% 4 6% 7% 35%	2340
	11th to 20th	Day	17% 7% 3 6% 5% 4 5% 5% 5% 7% 36%	2301
	21st to end	Day	8% 6% 3 7% 6% 4 6% 6% 8% 10% 36%	2531
June	1st to 10th	Day	11% 5% 3 5% 5% 3 6% 6% 5% 7% 44%	2366
	11th to 20th	Day	6% 4 2 5% 6% 4 7% 6% 7% 9% 45%	2520
	21st to end	Day	7% 5% 2 5% 5% 4 5% 6% 6% 10% 44%	2520
July	1st to 10th	Day	12% 6% 3 6% 5% 4 6% 7% 7% 10% 36%	2520
	11th to 20th	Day	8% 4 3 5% 5% 4 6% 7% 8% 9% 41%	2474
	21st to end	Day	9% 5% 2 5% 4 3 6% 6% 7% 11% 41%	2547
August	1st to 10th	Day	7% 5% 2 5% 6% 4 6% 6% 8% 10% 41%	2327
	11th to 20th	Day	9% 5% 2 6% 6% 4 5% 6% 7% 10% 40%	2181
	21st to end	Day	7% 5% 2 5% 6% 3 5% 5% 6% 9% 47%	2376
September	1st to 10th	Day	14% 5% 3 5% 5% 4 5% 4 5% 7% 43%	2094
	11th to 20th	Day	12% 5% 3 4 4 3 4 5% 6% 9% 46%	1980
	21st to end	Day	13% 5% 3 4 4 2 3 4 5% 7% 50%	1980
October	1st to 10th	Day	11% 4 2 4 4 2 3 3 5% 7% 53%	1980
	11th to 20th	Day	14% 5% 2 5% 4 2 4 4 5% 6% 49%	1905
	21st to end	Day	19% 6% 2 5% 4 2 3 4 5% 5% 43%	1790
November	1st to 10th	Day	11% 5% 3 4 4 2 4 3 4 6% 54%	1672
	11th to 20th	Day	16% 8% 3 6% 4 2 3 4 5% 6% 44%	1710
	21st to end	Day	18% 8% 3 5% 4 2 4 4 4 5% 42%	1710
December	1st to 10th	Day	22% 11% 3 6% 6% 2 4 4 4 5% 33%	1710
	11th to 20th	Day	15% 12% 5% 8% 7% 3 4 4 3 6% 33%	2153
	21st to end	Day	20% 16% 5% 6% 5% 3 5% 5% 4 7% 25%	2929
January	1st to 10th	Night	16% 11% 5% 9% 7% 3 4 4 4 5% 32%	2648
	11th to 20th	Night	20% 13% 6% 7% 5% 3 4 4 4 4 29%	2471
	21st to end	Night	18% 11% 4 7% 5% 3 4 3 4 5% 35%	2539
February	1st to 10th	Night	23% 12% 4 8% 5% 3 4 4 5% 6% 27%	2160
	11th to 20th	Night	20% 9% 4 7% 6% 2 4 4 4 5% 35%	2098
	21st to end	Night	24% 10% 4 7% 5% 2 5% 4 4 5% 31%	1776
March	1st to 10th	Night	17% 9% 3 5% 5% 2 4 4 4 5% 41%	2160
	11th to 20th	Night	20% 9% 3 6% 5% 3 5% 5% 4 5% 35%	2020
	21st to end	Night	18% 10% 4 6% 6% 3 4 4 4 6% 34%	2152
April	1st to 10th	Night	12% 5% 2 5% 6% 3 5% 6% 5% 7% 45%	1800
	11th to 20th	Night	16% 8% 3 5% 5% 2 4 4 4 7% 42%	1775
	21st to end	Night	17% 8% 3 5% 6% 3 4 4 5% 6% 39%	1656
May	1st to 10th	Night	16% 7% 3 6% 6% 3 5% 5% 5% 8% 37%	1620
	11th to 20th	Night	12% 6% 3 5% 6% 3 6% 6% 5% 7% 40%	1592
	21st to end	Night	6% 4 3 5% 6% 4 6% 6% 10% 11% 40%	1744
June	1st to 10th	Night	9% 4 3 4 5% 2 4 5% 6% 9% 49%	1588
	11th to 20th	Night	6% 3 2 4 5% 3 5% 6% 7% 9% 50%	1440
	21st to end	Night	5% 3 2 4 5% 3 6% 6% 6% 13% 48%	1440
July	1st to 10th	Night	9% 5% 2 6% 5% 4 6% 5% 6% 9% 43%	1440
	11th to 20th	Night	6% 4 2 4 4 3 5% 5% 7% 11% 48%	1484
	21st to end	Night	8% 4 2 5% 4 3 4 6% 7% 9% 47%	1771
August	1st to 10th	Night	7% 4 2 4 5% 3 4 5% 6% 10% 50%	1611
	11th to 20th	Night	6% 4 2 5% 5% 3 5% 7% 7% 11% 44%	1715
	21st to end	Night	6% 4 2 3 4 2 4 5% 6% 10% 54%	1980
September	1st to 10th	Night	11% 4 2 4 4 3 4 5% 6% 7% 49%	1846
	11th to 20th	Night	9% 5% 2 5% 4 3 4 5% 5% 7% 50%	1980
	21st to end	Night	10% 4 2 4 4 3 4 4 4 6% 54%	1980
October	1st to 10th	Night	9% 4 2 4 4 2 3 3 4 7% 58%	1980
	11th to 20th	Night	15% 5% 2 4 5% 3 3 4 4 7% 48%	2053
	21st to end	Night	17% 7% 2 5% 4 2 4 3 4 6% 45%	2564
November	1st to 10th	Night	12% 6% 3 4 4 2 3 4 5% 5% 52%	2406
	11th to 20th	Night	14% 7% 3 6% 4 3 4 4 4 7% 45%	2470
	21st to end	Night	18% 8% 4 5% 4 2 4 4 4 6% 41%	2470
December	1st to 10th	Night	21% 10% 4 6% 5% 3 5% 4 5% 6% 33%	2470
	11th to 20th	Night	19% 11% 5% 7% 5% 2 4 4 4 5% 35%	3042
	21st to end	Night	19% 15% 5% 8% 7% 4 6% 4 4 5% 22%	4724

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	51% 4 9% 23% 11% 2	1518
	11th to 20th	Day	60% 4 10% 17% 9% 1	1528
	21st to end	Day	50% 4 10% 26% 9% 2	1814
February	1st to 10th	Day	55% 3 8% 23% 9% 2	1800
	11th to 20th	Day	53% 4 8% 22% 10% 2	1758
	21st to end	Day	55% 4 9% 18% 11% 4	1480
March	1st to 10th	Day	46% 4 10% 22% 17% 1	1800
	11th to 20th	Day	52% 5% 10% 19% 12% 2	1939
	21st to end	Day	53% 5% 10% 21% 9% 2	2219
April	1st to 10th	Day	40% 6% 12% 24% 16% 2	2160
	11th to 20th	Day	45% 5% 9% 20% 18% 3	2134
	21st to end	Day	47% 5% 10% 24% 11% 3	2302
May	1st to 10th	Day	48% 6% 12% 23% 11% 1	2340
	11th to 20th	Day	47% 7% 13% 19% 13% 1	2305
	21st to end	Day	40% 10% 15% 20% 13% 1	2531
June	1st to 10th	Day	39% 7% 9% 24% 18% 3	2366
	11th to 20th	Day	32% 9% 15% 25% 18% 2	2520
	21st to end	Day	33% 10% 13% 21% 17% 5%	2520
July	1st to 10th	Day	41% 10% 13% 20% 13% 3	2451
	11th to 20th	Day	36% 11% 14% 22% 13% 4	2399
	21st to end	Day	34% 10% 14% 26% 13% 2	2405
August	1st to 10th	Day	35% 10% 16% 23% 15% 1	2314
	11th to 20th	Day	37% 9% 12% 25% 14% 2	2181
	21st to end	Day	33% 8% 12% 25% 17% 5%	2376
September	1st to 10th	Day	40% 7% 11% 21% 18% 4	2094
	11th to 20th	Day	34% 7% 11% 23% 22% 3	1980
	21st to end	Day	35% 4 9% 25% 23% 3	1980
October	1st to 10th	Day	31% 5% 8% 25% 26% 4	1980
	11th to 20th	Day	36% 4 8% 25% 23% 4	1905
	21st to end	Day	43% 5% 8% 25% 16% 3	1790
November	1st to 10th	Day	32% 5% 8% 29% 22% 5%	1672
	11th to 20th	Day	42% 3 8% 24% 19% 5%	1710
	21st to end	Day	45% 3 8% 23% 19% 1	1710
December	1st to 10th	Day	55% 3 11% 21% 10% 1	1710
	11th to 20th	Day	53% 4 8% 19% 13% 1	2150
	21st to end	Day	59% 5% 11% 17% 7%	2929
January	1st to 10th	Night	54% 4 8% 19% 13% 2	2648
	11th to 20th	Night	59% 4 10% 18% 9% 1	2471
	21st to end	Night	52% 3 10% 23% 10% 2	2539
February	1st to 10th	Night	58% 5% 11% 18% 7% 1	2160
	11th to 20th	Night	53% 3 7% 22% 13% 2	2099
	21st to end	Night	57% 4 10% 14% 12% 3	1776
March	1st to 10th	Night	46% 4 8% 21% 19% 3	2160
	11th to 20th	Night	51% 5% 10% 19% 12% 2	2020
	21st to end	Night	51% 4 10% 23% 10% 2	2152
April	1st to 10th	Night	38% 6% 11% 23% 19% 3	1800
	11th to 20th	Night	44% 3 8% 19% 20% 6%	1775
	21st to end	Night	46% 6% 9% 23% 13% 3	1656
May	1st to 10th	Night	46% 6% 9% 25% 10% 3	1620
	11th to 20th	Night	43% 8% 11% 21% 15% 1	1593
	21st to end	Night	34% 10% 16% 21% 16% 3	1745
June	1st to 10th	Night	31% 6% 13% 27% 19% 4	1588
	11th to 20th	Night	29% 7% 15% 24% 21% 5%	1440
	21st to end	Night	28% 8% 18% 23% 18% 6%	1440
July	1st to 10th	Night	36% 9% 13% 24% 14% 3	1400
	11th to 20th	Night	27% 9% 17% 24% 18% 5%	1436
	21st to end	Night	30% 9% 15% 28% 16% 2	1672
August	1st to 10th	Night	28% 8% 18% 27% 17% 2	1600
	11th to 20th	Night	30% 10% 15% 26% 17% 3	1715
	21st to end	Night	25% 7% 17% 26% 21% 4	1980
September	1st to 10th	Night	32% 7% 11% 24% 20% 6%	1846
	11th to 20th	Night	32% 6% 10% 25% 24% 4	1980
	21st to end	Night	31% 4 8% 26% 26% 5%	1980
October	1st to 10th	Night	27% 5% 10% 24% 29% 6%	1980
	11th to 20th	Night	36% 5% 8% 23% 24% 4	2053
	21st to end	Night	41% 3 7% 23% 21% 4	2564
November	1st to 10th	Night	35% 4 8% 25% 24% 5%	2406
	11th to 20th	Night	40% 4 7% 21% 21% 6%	2470
	21st to end	Night	45% 4 8% 24% 17% 2	2470
December	1st to 10th	Night	53% 5% 9% 20% 12% 1	2470
	11th to 20th	Night	52% 4 8% 20% 14% 2	3044
	21st to end	Night	63% 5% 9% 14% 8% 1	4724

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	25% 17% 31% 20% 6% 1	270
	11th to 20th	Day	32% 22% 28% 15% 3	246
	21st to end	Day	23% 28% 33% 13% 3	264
February	1st to 10th	Day	29% 21% 38% 9% 2 1	240
	11th to 20th	Day	30% 26% 33% 9% 2	240
	21st to end	Day	32% 17% 37% 11% 2	198
March	1st to 10th	Day	26% 21% 36% 15% 2	240
	11th to 20th	Day	26% 16% 37% 13% 6% 2	379
	21st to end	Day	28% 19% 30% 17% 5% 1	462
April	1st to 10th	Day	19% 18% 27% 25% 10% 1	420
	11th to 20th	Day	21% 18% 25% 21% 12% 3	412
	21st to end	Day	23% 14% 33% 19% 8% 3	420
May	1st to 10th	Day	19% 16% 30% 23% 7% 5%	423
	11th to 20th	Day	19% 9% 29% 25% 14% 5%	447
	21st to end	Day	13% 6% 22% 28% 20% 12%	485
June	1st to 10th	Day	11% 4 23% 26% 26% 10%	476
	11th to 20th	Day	5% 6% 21% 35% 23% 10%	630
	21st to end	Day	9% 6% 26% 26% 22% 11%	630
July	1st to 10th	Day	12% 3 16% 23% 25% 20%	621
	11th to 20th	Day	10% 4 17% 31% 23% 15%	572
	21st to end	Day	11% 3 13% 31% 30% 13%	488
August	1st to 10th	Day	10% 2 15% 27% 29% 17%	446
	11th to 20th	Day	12% 4 14% 29% 31% 11%	439
	21st to end	Day	9% 3 11% 28% 31% 18%	495
September	1st to 10th	Day	12% 4 15% 26% 32% 11%	450
	11th to 20th	Day	12% 3 15% 23% 30% 16%	450
	21st to end	Day	14% 8% 19% 24% 24% 11%	450
October	1st to 10th	Day	13% 4 21% 33% 22% 7%	450
	11th to 20th	Day	16% 12% 30% 26% 12% 3	450
	21st to end	Day	25% 15% 34% 16% 10%	305
November	1st to 10th	Day	16% 10% 33% 28% 10% 4	270
	11th to 20th	Day	23% 17% 31% 24% 4 2	270
	21st to end	Day	25% 11% 35% 20% 8% 1	270
December	1st to 10th	Day	25% 18% 30% 20% 7% 1	270
	11th to 20th	Day	23% 17% 38% 14% 8% 1	270
	21st to end	Day	30% 23% 27% 16% 3	297
January	1st to 10th	Night	21% 18% 31% 26% 4	950
	11th to 20th	Night	28% 14% 34% 20% 4	833
	21st to end	Night	24% 15% 37% 23% 2	792
February	1st to 10th	Night	29% 13% 32% 23% 3	720
	11th to 20th	Night	27% 16% 36% 20% 1	703
	21st to end	Night	28% 16% 36% 19% 2	592
March	1st to 10th	Night	22% 16% 33% 24% 5%	720
	11th to 20th	Night	25% 12% 34% 23% 7%	720
	21st to end	Night	25% 11% 27% 30% 7%	766
April	1st to 10th	Night	15% 12% 31% 32% 9%	540
	11th to 20th	Night	21% 10% 27% 29% 12% 1	533
	21st to end	Night	18% 10% 33% 28% 9% 1	540
May	1st to 10th	Night	21% 6% 28% 27% 16% 1	540
	11th to 20th	Night	16% 6% 18% 39% 17% 4	531
	21st to end	Night	8% 3 17% 37% 28% 6%	584
June	1st to 10th	Night	10% 2 19% 36% 29% 3	540
	11th to 20th	Night	8% 2 16% 41% 30% 3	540
	21st to end	Night	5% 2 17% 43% 29% 3	540
July	1st to 10th	Night	12% 1 10% 26% 41% 9%	525
	11th to 20th	Night	7% 2 11% 32% 42% 6%	522
	21st to end	Night	10% 3 11% 34% 36% 7%	591
August	1st to 10th	Night	7% 2 9% 32% 44% 5%	537
	11th to 20th	Night	7% 2 9% 40% 36% 7%	534
	21st to end	Night	7% 1 6% 35% 46% 4	594
September	1st to 10th	Night	13% 1 10% 33% 37% 6%	586
	11th to 20th	Night	11% 3 13% 30% 39% 5%	720
	21st to end	Night	11% 5% 20% 33% 29% 3	720
October	1st to 10th	Night	11% 4 18% 34% 28% 4	720
	11th to 20th	Night	16% 7% 27% 32% 17% 1	720
	21st to end	Night	20% 8% 33% 27% 12% 1	792
November	1st to 10th	Night	14% 8% 27% 32% 17% 1	740
	11th to 20th	Night	17% 12% 32% 28% 11%	760
	21st to end	Night	24% 11% 25% 28% 12% 1	760
December	1st to 10th	Night	27% 11% 29% 28% 5%	760
	11th to 20th	Night	25% 9% 32% 25% 8%	760
	21st to end	Night	29% 13% 30% 23% 4	950

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