Camp Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Creek clear sky chart from 2005-11-06 to 2024-10-20.

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% 9% 3 8% 5% 5% 5% 4 6% 7% 33%	101065
	Night	12% 9% 4 8% 5% 5% 5% 4 5% 7% 36%	97580
Transparency	Day	47% 6% 12% 22% 12% 2	100877
	Night	45% 5% 12% 23% 13% 2	97438
Seeing	Day	21% 13% 23% 22% 14% 7%	15089
	Night	19% 12% 21% 30% 17% 2	25156

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% 13% 6% 16% 6% 3 3 3 4 6% 26%	2836
	11th to 20th	Day	14% 12% 7% 17% 7% 7% 4 3 3 4 23%	2840
	21st to end	Day	15% 18% 7% 9% 4 3 3 3 4 5% 27%	3124
February	1st to 10th	Day	13% 10% 4 12% 5% 5% 5% 4 5% 6% 30%	1710
	11th to 20th	Day	16% 11% 4 11% 5% 6% 4 4 6% 6% 28%	1775
	21st to end	Day	17% 11% 5% 11% 5% 4 3 3 4 6% 30%	1579
March	1st to 10th	Day	21% 12% 4 7% 5% 4 4 3 5% 6% 29%	3435
	11th to 20th	Day	12% 9% 3 7% 4 4 4 4 5% 6% 42%	3480
	21st to end	Day	15% 10% 3 7% 6% 4 5% 4 6% 6% 35%	3815
April	1st to 10th	Day	12% 11% 4 6% 5% 5% 5% 4 6% 7% 36%	2104
	11th to 20th	Day	13% 9% 3 7% 5% 5% 4 3 5% 6% 40%	2291
	21st to end	Day	17% 8% 3 6% 5% 4 5% 4 5% 6% 36%	2470
May	1st to 10th	Day	17% 10% 3 10% 6% 5% 6% 5% 7% 6% 25%	4082
	11th to 20th	Day	19% 9% 3 8% 6% 6% 5% 5% 7% 6% 27%	4081
	21st to end	Day	10% 6% 2 7% 5% 6% 7% 6% 7% 10% 34%	4476
June	1st to 10th	Day	12% 5% 3 8% 6% 6% 5% 5% 6% 9% 35%	2470
	11th to 20th	Day	9% 5% 2 7% 5% 6% 7% 6% 7% 10% 35%	2470
	21st to end	Day	9% 6% 2 7% 5% 6% 6% 6% 7% 8% 37%	2470
July	1st to 10th	Day	7% 5% 2 7% 6% 6% 7% 5% 8% 9% 38%	4120
	11th to 20th	Day	9% 6% 3 7% 5% 5% 6% 5% 7% 11% 36%	4120
	21st to end	Day	14% 9% 4 11% 8% 7% 6% 5% 6% 8% 23%	4466
August	1st to 10th	Day	10% 7% 3 8% 7% 7% 7% 6% 8% 11% 27%	4104
	11th to 20th	Day	9% 6% 3 8% 6% 7% 7% 6% 9% 10% 28%	4044
	21st to end	Day	5% 4 2 6% 4 5% 6% 5% 6% 11% 47%	4322
September	1st to 10th	Day	11% 6% 3 7% 5% 5% 5% 4 5% 6% 43%	2147
	11th to 20th	Day	13% 8% 3 7% 5% 6% 5% 3 5% 8% 36%	2090
	21st to end	Day	19% 8% 3 7% 4 4 5% 4 5% 7% 33%	2090
October	1st to 10th	Day	14% 7% 2 7% 4 3 4 3 6% 7% 43%	1967
	11th to 20th	Day	14% 8% 3 7% 3 3 4 4 4 6% 43%	1890
	21st to end	Day	15% 11% 3 7% 4 4 4 3 3 6% 41%	1980
November	1st to 10th	Day	10% 7% 3 6% 3 4 4 4 6% 7% 47%	1810
	11th to 20th	Day	12% 10% 4 8% 4 4 4 3 5% 7% 39%	1710
	21st to end	Day	13% 11% 4 6% 5% 4 5% 4 5% 6% 39%	1710
December	1st to 10th	Day	18% 15% 5% 11% 4 3 4 3 5% 5% 26%	1710
	11th to 20th	Day	15% 13% 5% 9% 5% 4 4 4 5% 7% 31%	2153
	21st to end	Day	15% 14% 7% 10% 6% 6% 5% 5% 6% 6% 21%	3124
January	1st to 10th	Night	11% 16% 9% 15% 6% 5% 4 3 5% 5% 23%	4109
	11th to 20th	Night	16% 10% 4 11% 7% 6% 4 3 4 5% 29%	4120
	21st to end	Night	16% 15% 4 9% 7% 7% 5% 4 5% 6% 24%	4532
February	1st to 10th	Night	13% 11% 5% 10% 5% 5% 4 5% 5% 7% 30%	2470
	11th to 20th	Night	17% 10% 4 11% 7% 5% 5% 4 4 5% 28%	2287
	21st to end	Night	14% 12% 5% 12% 6% 5% 4 4 5% 5% 29%	1875
March	1st to 10th	Night	20% 14% 3 6% 5% 5% 4 3 3 6% 32%	3418
	11th to 20th	Night	12% 9% 3 7% 5% 4 4 4 5% 6% 41%	3480
	21st to end	Night	13% 8% 2 6% 4 4 5% 4 6% 7% 41%	3817
April	1st to 10th	Night	10% 11% 3 7% 5% 5% 5% 4 5% 8% 36%	2076
	11th to 20th	Night	11% 9% 2 6% 5% 4 4 4 7% 7% 42%	1853
	21st to end	Night	13% 7% 3 7% 6% 5% 5% 3 6% 7% 38%	1710
May	1st to 10th	Night	17% 12% 4 8% 5% 4 5% 4 6% 6% 28%	2813
	11th to 20th	Night	19% 11% 3 8% 5% 4 4 3 4 7% 33%	2812
	21st to end	Night	10% 7% 3 8% 5% 4 6% 4 6% 9% 38%	3079
June	1st to 10th	Night	10% 5% 2 6% 5% 5% 5% 4 7% 9% 41%	1710
	11th to 20th	Night	8% 5% 2 7% 5% 5% 4 4 8% 10% 42%	1710
	21st to end	Night	8% 6% 2 5% 5% 5% 5% 4 8% 11% 41%	1710
July	1st to 10th	Night	5% 5% 2 7% 5% 6% 6% 5% 8% 11% 40%	2840
	11th to 20th	Night	7% 4 2 7% 4 3 5% 4 7% 10% 46%	2840
	21st to end	Night	9% 10% 3 10% 6% 6% 6% 6% 7% 9% 28%	3087
August	1st to 10th	Night	11% 7% 3 9% 5% 6% 5% 5% 7% 8% 34%	2825
	11th to 20th	Night	8% 7% 3 8% 5% 6% 6% 5% 7% 7% 38%	2785
	21st to end	Night	5% 3 1 4 4 4 4 3 7% 10% 54%	3302
September	1st to 10th	Night	9% 7% 2 7% 5% 4 5% 4 5% 6% 47%	2028
	11th to 20th	Night	13% 7% 3 6% 3 3 5% 3 4 7% 46%	2090
	21st to end	Night	13% 9% 3 6% 4 3 4 4 5% 7% 41%	2090
October	1st to 10th	Night	13% 6% 2 5% 5% 3 4 4 4 6% 48%	2213
	11th to 20th	Night	11% 9% 3 6% 5% 5% 4 3 4 6% 45%	2275
	21st to end	Night	12% 10% 3 7% 4 4 4 3 5% 5% 43%	2376
November	1st to 10th	Night	10% 8% 3 6% 4 4 4 3 4 5% 48%	2264
	11th to 20th	Night	11% 10% 3 7% 5% 4 5% 4 6% 6% 41%	2470
	21st to end	Night	11% 10% 3 8% 5% 4 4 4 5% 6% 40%	2470
December	1st to 10th	Night	16% 12% 5% 12% 6% 5% 4 4 5% 5% 26%	2470
	11th to 20th	Night	13% 10% 6% 13% 5% 5% 4 4 5% 6% 29%	3042
	21st to end	Night	15% 11% 8% 11% 6% 5% 6% 4 5% 7% 22%	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	59% 3 6% 20% 10% 1	2837
	11th to 20th	Day	65% 2 7% 16% 10% 1	2840
	21st to end	Day	58% 3 8% 18% 12% 1	3124
February	1st to 10th	Day	52% 5% 8% 21% 13% 1	1710
	11th to 20th	Day	54% 4 8% 19% 12% 2	1784
	21st to end	Day	55% 4 8% 16% 14% 3	1579
March	1st to 10th	Day	52% 6% 8% 20% 12% 2	3435
	11th to 20th	Day	41% 3 9% 24% 19% 3	3480
	21st to end	Day	47% 5% 10% 24% 12% 2	3815
April	1st to 10th	Day	45% 4 11% 23% 14% 3	2104
	11th to 20th	Day	43% 4 10% 24% 16% 3	2291
	21st to end	Day	47% 5% 12% 23% 12% 2	2470
May	1st to 10th	Day	55% 6% 11% 18% 9% 1	4120
	11th to 20th	Day	53% 7% 11% 22% 7% 1	4085
	21st to end	Day	40% 8% 16% 21% 11% 3	4489
June	1st to 10th	Day	43% 7% 14% 22% 13%	2470
	11th to 20th	Day	39% 9% 16% 20% 14% 1	2470
	21st to end	Day	40% 8% 15% 21% 14% 2	2470
July	1st to 10th	Day	38% 10% 20% 20% 9% 3	4055
	11th to 20th	Day	38% 8% 17% 27% 8% 1	4051
	21st to end	Day	56% 7% 11% 17% 7%	4324
August	1st to 10th	Day	44% 11% 18% 20% 6%	4091
	11th to 20th	Day	41% 10% 15% 24% 10%	4083
	21st to end	Day	29% 8% 18% 31% 13% 1	4322
September	1st to 10th	Day	39% 7% 13% 21% 16% 4	2147
	11th to 20th	Day	46% 5% 9% 22% 17% 2	2090
	21st to end	Day	49% 6% 10% 19% 14% 2	2090
October	1st to 10th	Day	40% 4 11% 23% 18% 4	1967
	11th to 20th	Day	42% 3 10% 23% 18% 3	1890
	21st to end	Day	45% 3 8% 25% 15% 4	1980
November	1st to 10th	Day	35% 4 9% 24% 24% 3	1810
	11th to 20th	Day	44% 3 8% 23% 18% 4	1710
	21st to end	Day	44% 3 11% 24% 16% 3	1710
December	1st to 10th	Day	59% 3 9% 17% 10% 1	1710
	11th to 20th	Day	50% 3 10% 18% 18% 1	2150
	21st to end	Day	60% 4 9% 21% 6% 1	3124
January	1st to 10th	Night	62% 3 7% 15% 11% 1	4109
	11th to 20th	Night	54% 3 7% 19% 15% 1	4120
	21st to end	Night	59% 3 9% 19% 10% 1	4532
February	1st to 10th	Night	50% 3 14% 19% 13% 1	2470
	11th to 20th	Night	58% 3 8% 17% 11% 3	2289
	21st to end	Night	56% 4 10% 18% 9% 4	1875
March	1st to 10th	Night	54% 5% 7% 22% 11% 1	3418
	11th to 20th	Night	42% 4 8% 29% 16% 2	3480
	21st to end	Night	40% 5% 13% 24% 17% 2	3817
April	1st to 10th	Night	44% 5% 12% 22% 14% 3	2076
	11th to 20th	Night	39% 4 12% 23% 17% 4	1853
	21st to end	Night	43% 5% 14% 25% 12% 1	1710
May	1st to 10th	Night	52% 5% 15% 19% 8% 1	2840
	11th to 20th	Night	50% 7% 13% 25% 5% 1	2813
	21st to end	Night	39% 8% 17% 25% 8% 3	3087
June	1st to 10th	Night	35% 10% 18% 23% 14% 1	1710
	11th to 20th	Night	35% 8% 20% 22% 13% 2	1710
	21st to end	Night	34% 8% 16% 25% 14% 2	1710
July	1st to 10th	Night	33% 12% 22% 19% 11% 2	2795
	11th to 20th	Night	29% 8% 21% 33% 8% 2	2786
	21st to end	Night	46% 12% 14% 21% 7%	2988
August	1st to 10th	Night	44% 9% 19% 22% 6%	2814
	11th to 20th	Night	38% 9% 15% 28% 10%	2812
	21st to end	Night	25% 7% 15% 37% 15% 1	3302
September	1st to 10th	Night	37% 7% 14% 21% 15% 5%	2028
	11th to 20th	Night	38% 6% 10% 25% 19% 1	2090
	21st to end	Night	43% 5% 11% 25% 15% 1	2090
October	1st to 10th	Night	36% 5% 10% 26% 19% 4	2213
	11th to 20th	Night	40% 4 10% 25% 18% 4	2275
	21st to end	Night	41% 3 8% 26% 16% 5%	2376
November	1st to 10th	Night	37% 4 9% 23% 23% 4	2264
	11th to 20th	Night	41% 4 9% 21% 20% 5%	2470
	21st to end	Night	43% 3 10% 24% 17% 4	2470
December	1st to 10th	Night	57% 4 10% 18% 9% 2	2470
	11th to 20th	Night	55% 3 8% 20% 13% 1	3044
	21st to end	Night	59% 4 9% 17% 9%	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	37% 27% 22% 9% 4 1	270
	11th to 20th	Day	39% 21% 30% 9% 1	270
	21st to end	Day	37% 23% 25% 12% 3	297
February	1st to 10th	Day	30% 25% 28% 16% 2	270
	11th to 20th	Day	46% 22% 22% 9% 1	270
	21st to end	Day	40% 24% 29% 7% 1	234
March	1st to 10th	Day	31% 20% 23% 18% 7% 1	460
	11th to 20th	Day	31% 24% 23% 17% 4 1	460
	21st to end	Day	30% 20% 27% 16% 7%	506
April	1st to 10th	Day	28% 21% 24% 17% 9% 1	460
	11th to 20th	Day	22% 17% 29% 19% 10% 2	452
	21st to end	Day	28% 14% 28% 16% 11% 2	460
May	1st to 10th	Day	27% 15% 27% 18% 9% 5%	463
	11th to 20th	Day	22% 9% 29% 20% 14% 6%	487
	21st to end	Day	16% 8% 21% 25% 17% 12%	529
June	1st to 10th	Day	13% 7% 27% 25% 19% 10%	490
	11th to 20th	Day	9% 9% 25% 28% 18% 11%	490
	21st to end	Day	11% 10% 24% 28% 16% 10%	490
July	1st to 10th	Day	13% 5% 19% 26% 22% 16%	485
	11th to 20th	Day	7% 3 19% 33% 22% 14%	484
	21st to end	Day	13% 5% 19% 25% 25% 13%	532
August	1st to 10th	Day	11% 6% 21% 24% 23% 15%	486
	11th to 20th	Day	11% 4 20% 24% 24% 16%	479
	21st to end	Day	9% 3 16% 27% 25% 19%	539
September	1st to 10th	Day	11% 5% 17% 28% 26% 13%	490
	11th to 20th	Day	15% 5% 12% 28% 28% 12%	490
	21st to end	Day	24% 9% 17% 29% 16% 4	490
October	1st to 10th	Day	20% 5% 20% 26% 23% 6%	490
	11th to 20th	Day	17% 17% 21% 23% 19% 3	486
	21st to end	Day	24% 13% 26% 20% 14% 3	495
November	1st to 10th	Day	19% 12% 27% 25% 13% 4	408
	11th to 20th	Day	29% 16% 22% 26% 6% 2	270
	21st to end	Day	25% 19% 30% 21% 4 1	270
December	1st to 10th	Day	37% 19% 25% 14% 4	270
	11th to 20th	Day	30% 21% 27% 13% 7% 1	270
	21st to end	Day	28% 21% 27% 16% 6% 2	297
January	1st to 10th	Night	26% 24% 26% 20% 3	760
	11th to 20th	Night	32% 18% 26% 22% 3	760
	21st to end	Night	26% 23% 29% 20% 2	836
February	1st to 10th	Night	27% 18% 28% 25% 2	760
	11th to 20th	Night	31% 24% 27% 16% 1	743
	21st to end	Night	26% 21% 33% 18% 1	628
March	1st to 10th	Night	24% 16% 31% 25% 3	760
	11th to 20th	Night	27% 18% 26% 21% 7%	760
	21st to end	Night	21% 16% 31% 25% 7%	836
April	1st to 10th	Night	21% 18% 27% 28% 6%	760
	11th to 20th	Night	19% 14% 27% 29% 11% 1	729
	21st to end	Night	17% 13% 25% 36% 9% 1	570
May	1st to 10th	Night	17% 10% 24% 33% 14% 1	570
	11th to 20th	Night	17% 7% 20% 35% 21% 1	561
	21st to end	Night	13% 4 14% 34% 31% 5%	617
June	1st to 10th	Night	10% 3 16% 40% 27% 4	570
	11th to 20th	Night	9% 3 15% 35% 34% 5%	570
	21st to end	Night	8% 4 14% 41% 30% 3	570
July	1st to 10th	Night	8% 2 12% 35% 39% 4	555
	11th to 20th	Night	7% 2 8% 35% 43% 5%	552
	21st to end	Night	7% 2 9% 39% 38% 5%	624
August	1st to 10th	Night	11% 1 8% 37% 38% 5%	567
	11th to 20th	Night	12% 2 10% 34% 38% 4	564
	21st to end	Night	10% 2 7% 34% 40% 7%	727
September	1st to 10th	Night	11% 4 9% 33% 37% 6%	760
	11th to 20th	Night	15% 3 10% 33% 34% 4	760
	21st to end	Night	18% 6% 14% 35% 26% 1	760
October	1st to 10th	Night	16% 7% 18% 30% 25% 4	760
	11th to 20th	Night	16% 12% 23% 31% 16% 1	759
	21st to end	Night	20% 12% 21% 34% 11% 2	792
November	1st to 10th	Night	17% 9% 23% 33% 16% 2	740
	11th to 20th	Night	20% 14% 23% 30% 12% 1	760
	21st to end	Night	19% 14% 24% 33% 9% 1	760
December	1st to 10th	Night	27% 19% 26% 23% 6%	760
	11th to 20th	Night	21% 21% 27% 26% 5%	760
	21st to end	Night	26% 15% 26% 29% 4	836

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