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 2024-11-10.

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% 8% 3 7% 4 4 4 4 6% 7% 39%	101227
	Night	14% 9% 3 6% 4 4 4 3 5% 7% 40%	97904
Transparency	Day	42% 6% 10% 24% 16% 2	104924
	Night	42% 5% 10% 23% 17% 3	102346
Seeing	Day	17% 11% 25% 24% 16% 7%	15312
	Night	18% 9% 25% 29% 17% 2	25027

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	15% 14% 6% 8% 4 4 5% 4 6% 6% 29%	2527
	11th to 20th	Day	18% 11% 4 14% 5% 5% 4 2 4 4 28%	2654
	21st to end	Day	27% 16% 6% 6% 4 3 2 3 4 5% 24%	3170
February	1st to 10th	Day	19% 12% 4 9% 4 4 3 3 3 6% 34%	1900
	11th to 20th	Day	18% 10% 3 7% 5% 4 4 3 5% 6% 35%	1848
	21st to end	Day	19% 11% 4 8% 5% 3 4 4 6% 5% 31%	1570
March	1st to 10th	Day	26% 14% 3 6% 3 3 3 2 4 5% 32%	3120
	11th to 20th	Day	14% 7% 2 6% 4 3 3 4 5% 7% 45%	3411
	21st to end	Day	14% 8% 3 8% 5% 4 5% 4 6% 7% 38%	3896
April	1st to 10th	Day	13% 7% 2 6% 5% 4 5% 3 6% 8% 40%	2280
	11th to 20th	Day	15% 10% 2 6% 4 4 4 3 5% 6% 40%	2254
	21st to end	Day	17% 8% 2 6% 6% 5% 4 4 6% 6% 38%	2430
May	1st to 10th	Day	19% 9% 2 7% 5% 5% 5% 4 7% 7% 30%	4082
	11th to 20th	Day	19% 7% 3 7% 4 4 4 4 5% 7% 38%	4081
	21st to end	Day	11% 6% 3 7% 5% 5% 4 4 7% 9% 37%	4476
June	1st to 10th	Day	10% 5% 2 6% 5% 5% 6% 5% 6% 7% 43%	2498
	11th to 20th	Day	6% 4 2 5% 5% 6% 6% 4 7% 10% 45%	2660
	21st to end	Day	6% 6% 2 5% 5% 5% 6% 5% 6% 10% 44%	2660
July	1st to 10th	Day	11% 6% 3 7% 5% 5% 5% 5% 6% 9% 39%	4440
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 5% 8% 10% 44%	4352
	21st to end	Day	12% 10% 4 10% 6% 6% 6% 4 7% 8% 26%	4466
August	1st to 10th	Day	6% 5% 2 5% 4 4 5% 4 7% 11% 48%	4104
	11th to 20th	Day	8% 5% 2 6% 5% 5% 6% 5% 8% 11% 39%	3824
	21st to end	Day	5% 3 2 5% 4 4 4 3 6% 8% 56%	4180
September	1st to 10th	Day	13% 6% 3 6% 4 5% 4 3 5% 7% 43%	2210
	11th to 20th	Day	11% 6% 2 5% 3 4 4 4 6% 9% 46%	2090
	21st to end	Day	14% 6% 2 5% 4 4 4 3 5% 7% 47%	2090
October	1st to 10th	Day	10% 4 2 4 4 3 3 3 5% 7% 55%	2090
	11th to 20th	Day	13% 5% 2 5% 4 3 4 3 5% 6% 50%	2010
	21st to end	Day	18% 7% 2 6% 4 3 3 3 5% 5% 44%	1889
November	1st to 10th	Day	12% 5% 2 4 3 4 4 2 4 7% 53%	1753
	11th to 20th	Day	15% 9% 3 6% 4 3 3 3 5% 6% 44%	1710
	21st to end	Day	18% 9% 3 6% 3 3 4 3 5% 5% 41%	1710
December	1st to 10th	Day	22% 12% 2 7% 5% 3 4 3 4 5% 32%	1710
	11th to 20th	Day	15% 12% 4 10% 6% 4 4 3 4 6% 33%	2153
	21st to end	Day	20% 17% 5% 7% 4 4 4 4 4 7% 24%	2929
January	1st to 10th	Night	17% 16% 5% 9% 5% 4 3 3 5% 5% 29%	4428
	11th to 20th	Night	18% 15% 6% 10% 6% 4 3 3 3 3 28%	4306
	21st to end	Night	25% 15% 4 6% 4 3 3 2 4 5% 28%	4469
February	1st to 10th	Night	22% 13% 4 8% 4 3 4 3 5% 6% 29%	2280
	11th to 20th	Night	19% 10% 4 8% 5% 3 4 3 4 5% 36%	2218
	21st to end	Night	23% 10% 4 8% 4 4 4 3 4 5% 31%	1884
March	1st to 10th	Night	24% 13% 3 6% 4 4 3 2 4 5% 32%	3733
	11th to 20th	Night	14% 7% 2 5% 4 3 4 3 4 5% 48%	3548
	21st to end	Night	14% 8% 3 7% 5% 4 4 4 4 5% 41%	3764
April	1st to 10th	Night	12% 6% 2 7% 5% 4 5% 4 5% 6% 44%	1900
	11th to 20th	Night	16% 9% 3 6% 4 3 3 3 4 6% 42%	1875
	21st to end	Night	17% 8% 2 6% 5% 4 5% 3 5% 6% 39%	1748
May	1st to 10th	Night	18% 9% 3 8% 5% 4 5% 4 5% 7% 30%	2813
	11th to 20th	Night	16% 6% 2 5% 4 4 4 4 5% 7% 42%	2812
	21st to end	Night	8% 6% 2 6% 5% 5% 5% 5% 8% 9% 41%	3079
June	1st to 10th	Night	9% 5% 2 4 4 3 4 4 6% 9% 48%	1676
	11th to 20th	Night	6% 4 2 4 4 4 5% 5% 7% 9% 50%	1520
	21st to end	Night	5% 4 2 4 4 5% 5% 4 7% 12% 48%	1520
July	1st to 10th	Night	8% 5% 2 6% 4 5% 5% 4 5% 9% 46%	2530
	11th to 20th	Night	5% 4 2 4 3 4 4 4 7% 10% 52%	2613
	21st to end	Night	10% 9% 4 10% 7% 6% 6% 5% 7% 8% 30%	3087
August	1st to 10th	Night	5% 4 2 4 4 4 4 4 6% 9% 53%	2825
	11th to 20th	Night	6% 4 2 6% 4 5% 5% 5% 7% 10% 46%	3000
	21st to end	Night	3 3 1 3 3 3 3 3 6% 9% 63%	3476
September	1st to 10th	Night	10% 5% 2 5% 4 4 4 3 7% 7% 50%	1949
	11th to 20th	Night	8% 6% 2 5% 4 4 4 4 5% 7% 51%	2090
	21st to end	Night	11% 5% 2 5% 4 4 3 3 4 6% 52%	2090
October	1st to 10th	Night	9% 4 2 5% 3 3 3 3 4 7% 59%	2090
	11th to 20th	Night	14% 5% 2 4 4 4 3 3 4 7% 50%	2168
	21st to end	Night	16% 7% 2 6% 3 3 3 3 4 5% 47%	2707
November	1st to 10th	Night	13% 6% 2 5% 3 3 3 4 5% 5% 51%	2530
	11th to 20th	Night	14% 8% 3 7% 4 4 4 3 4 7% 45%	2470
	21st to end	Night	18% 9% 4 5% 4 3 3 4 4 5% 41%	2470
December	1st to 10th	Night	21% 11% 3 7% 4 4 4 3 5% 6% 33%	2470
	11th to 20th	Night	19% 12% 4 7% 4 3 3 3 4 5% 34%	3042
	21st to end	Night	19% 16% 5% 9% 6% 6% 5% 3 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	55% 5% 10% 20% 9% 1	2528
	11th to 20th	Day	61% 3 8% 18% 8% 1	2654
	21st to end	Day	63% 3 7% 21% 5% 1	3170
February	1st to 10th	Day	54% 3 8% 23% 11% 2	1900
	11th to 20th	Day	51% 4 8% 22% 11% 3	1858
	21st to end	Day	54% 4 9% 18% 11% 3	1570
March	1st to 10th	Day	56% 3 7% 18% 12% 4	3120
	11th to 20th	Day	38% 5% 10% 27% 18% 2	3411
	21st to end	Day	44% 6% 12% 24% 13% 1	3896
April	1st to 10th	Day	41% 6% 12% 23% 16% 2	2280
	11th to 20th	Day	44% 5% 9% 21% 18% 3	2254
	21st to end	Day	46% 5% 10% 25% 11% 3	2430
May	1st to 10th	Day	51% 8% 13% 18% 10%	4120
	11th to 20th	Day	46% 6% 11% 21% 14% 1	4085
	21st to end	Day	40% 8% 12% 18% 20% 2	4489
June	1st to 10th	Day	39% 7% 9% 24% 18% 3	2498
	11th to 20th	Day	32% 9% 14% 25% 18% 2	2660
	21st to end	Day	33% 10% 13% 21% 18% 5%	2660
July	1st to 10th	Day	40% 7% 13% 23% 16% 2	4371
	11th to 20th	Day	31% 8% 13% 33% 13% 2	4277
	21st to end	Day	54% 8% 11% 17% 8% 1	4324
August	1st to 10th	Day	28% 8% 15% 34% 15% 1	4091
	11th to 20th	Day	36% 8% 12% 28% 15% 1	3863
	21st to end	Day	25% 6% 10% 38% 17% 3	4179
September	1st to 10th	Day	39% 6% 11% 20% 20% 4	2210
	11th to 20th	Day	34% 7% 11% 24% 21% 3	2090
	21st to end	Day	38% 5% 8% 24% 22% 3	2090
October	1st to 10th	Day	20% 4 6% 27% 41% 3	3480
	11th to 20th	Day	25% 3 10% 27% 32% 3	3315
	21st to end	Day	31% 4 7% 30% 21% 7%	3089
November	1st to 10th	Day	33% 5% 8% 28% 22% 4	1753
	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	56% 4 9% 19% 11% 1	4428
	11th to 20th	Night	60% 4 7% 19% 8% 2	4306
	21st to end	Night	59% 4 8% 19% 10% 1	4469
February	1st to 10th	Night	56% 5% 11% 18% 9% 1	2280
	11th to 20th	Night	52% 3 7% 22% 14% 2	2219
	21st to end	Night	56% 4 10% 14% 12% 3	1884
March	1st to 10th	Night	55% 4 7% 20% 12% 2	3733
	11th to 20th	Night	38% 6% 10% 26% 17% 4	3548
	21st to end	Night	45% 4 10% 25% 15% 1	3764
April	1st to 10th	Night	39% 6% 11% 23% 18% 3	1900
	11th to 20th	Night	44% 3 8% 19% 20% 6%	1875
	21st to end	Night	45% 6% 9% 24% 14% 3	1748
May	1st to 10th	Night	52% 8% 10% 22% 7% 2	2840
	11th to 20th	Night	41% 8% 12% 26% 12% 1	2813
	21st to end	Night	33% 10% 14% 22% 18% 3	3087
June	1st to 10th	Night	31% 6% 13% 27% 18% 4	1676
	11th to 20th	Night	28% 7% 15% 24% 22% 5%	1520
	21st to end	Night	28% 8% 18% 22% 18% 6%	1520
July	1st to 10th	Night	34% 8% 13% 28% 16% 2	2490
	11th to 20th	Night	26% 8% 13% 35% 16% 3	2565
	21st to end	Night	49% 9% 12% 19% 10% 1	2988
August	1st to 10th	Night	25% 8% 14% 36% 15% 1	2814
	11th to 20th	Night	30% 9% 14% 29% 17% 2	3027
	21st to end	Night	18% 6% 14% 34% 24% 4	3476
September	1st to 10th	Night	32% 7% 11% 23% 22% 6%	1949
	11th to 20th	Night	31% 6% 10% 24% 24% 4	2090
	21st to end	Night	33% 4 8% 25% 24% 5%	2090
October	1st to 10th	Night	20% 3 6% 19% 48% 4	3480
	11th to 20th	Night	24% 3 6% 25% 36% 6%	3602
	21st to end	Night	30% 3 7% 21% 31% 7%	4457
November	1st to 10th	Night	35% 4 8% 25% 23% 5%	2530
	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% 18% 31% 20% 6% 1	270
	11th to 20th	Day	31% 25% 28% 14% 3	270
	21st to end	Day	26% 26% 32% 13% 3	297
February	1st to 10th	Day	27% 20% 39% 11% 1 1	270
	11th to 20th	Day	27% 27% 34% 9% 3 1	270
	21st to end	Day	33% 19% 36% 10% 2	225
March	1st to 10th	Day	29% 20% 33% 16% 3	270
	11th to 20th	Day	24% 18% 38% 13% 6% 1	417
	21st to end	Day	27% 19% 31% 17% 5% 1	506
April	1st to 10th	Day	22% 18% 27% 24% 9% 1	460
	11th to 20th	Day	21% 19% 26% 21% 11% 3	452
	21st to end	Day	22% 14% 34% 19% 8% 3	460
May	1st to 10th	Day	19% 17% 29% 24% 7% 4	463
	11th to 20th	Day	18% 9% 28% 25% 15% 5%	487
	21st to end	Day	13% 7% 24% 27% 19% 11%	529
June	1st to 10th	Day	11% 5% 25% 26% 24% 10%	518
	11th to 20th	Day	5% 5% 21% 36% 23% 10%	680
	21st to end	Day	9% 6% 27% 26% 21% 11%	680
July	1st to 10th	Day	12% 4 17% 24% 24% 19%	671
	11th to 20th	Day	9% 4 18% 33% 22% 14%	619
	21st to end	Day	12% 3 14% 31% 28% 12%	532
August	1st to 10th	Day	10% 2 15% 27% 29% 16%	486
	11th to 20th	Day	12% 5% 16% 29% 29% 10%	479
	21st to end	Day	9% 3 10% 29% 32% 18%	539
September	1st to 10th	Day	12% 4 16% 26% 31% 11%	490
	11th to 20th	Day	12% 3 14% 24% 31% 15%	490
	21st to end	Day	16% 8% 19% 23% 23% 11%	490
October	1st to 10th	Day	12% 4 20% 32% 24% 8%	490
	11th to 20th	Day	15% 12% 30% 25% 14% 4	490
	21st to end	Day	23% 14% 36% 17% 9% 1	338
November	1st to 10th	Day	16% 10% 34% 27% 9% 3	297
	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% 15% 33% 19% 4	868
	21st to end	Night	25% 14% 36% 23% 2	836
February	1st to 10th	Night	28% 13% 33% 23% 3	760
	11th to 20th	Night	27% 15% 36% 20% 2	743
	21st to end	Night	28% 16% 36% 18% 2	628
March	1st to 10th	Night	23% 16% 31% 24% 5%	760
	11th to 20th	Night	24% 12% 34% 23% 6%	760
	21st to end	Night	25% 11% 29% 28% 7%	808
April	1st to 10th	Night	15% 13% 32% 31% 9%	570
	11th to 20th	Night	21% 11% 28% 28% 11% 1	563
	21st to end	Night	18% 10% 34% 28% 8% 1	570
May	1st to 10th	Night	21% 7% 27% 28% 15% 1	570
	11th to 20th	Night	16% 6% 18% 39% 18% 4	561
	21st to end	Night	8% 4 18% 38% 27% 6%	617
June	1st to 10th	Night	11% 3 19% 37% 28% 3	570
	11th to 20th	Night	7% 2 15% 42% 30% 3	570
	21st to end	Night	5% 2 17% 44% 28% 4	570
July	1st to 10th	Night	13% 1 11% 27% 39% 9%	555
	11th to 20th	Night	7% 2 11% 34% 40% 6%	552
	21st to end	Night	10% 3 11% 34% 36% 6%	624
August	1st to 10th	Night	7% 2 10% 32% 44% 5%	567
	11th to 20th	Night	6% 2 9% 41% 34% 6%	564
	21st to end	Night	7% 1 6% 34% 47% 4	627
September	1st to 10th	Night	13% 1 10% 34% 37% 5%	619
	11th to 20th	Night	11% 3 13% 31% 38% 4	760
	21st to end	Night	13% 4 19% 33% 28% 3	760
October	1st to 10th	Night	11% 4 18% 35% 29% 4	760
	11th to 20th	Night	16% 7% 27% 31% 17% 1	760
	21st to end	Night	19% 7% 33% 27% 13% 1	836
November	1st to 10th	Night	15% 8% 27% 32% 17% 1	779
	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

Page generated at 2024-11-07 06:55:50. Version ac07

Copyright © 2024 Attilla Danko.