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 2026-08-15.

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	12% 8% 4 9% 6% 5% 5% 4 6% 8% 33%	143561
	Night	12% 9% 4 9% 6% 5% 5% 4 6% 7% 35%	138341
Transparency	Day	45% 7% 11% 22% 13% 2	147206
	Night	44% 6% 11% 22% 13% 2	142768
Seeing	Day	22% 13% 23% 21% 14% 6%	17520
	Night	19% 12% 21% 29% 16% 2	27563

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	13% 12% 6% 13% 7% 4 3 3 4 6% 28%	5258
	11th to 20th	Day	9% 12% 7% 16% 7% 5% 3 2 3 3 32%	5280
	21st to end	Day	13% 12% 5% 10% 7% 3 3 3 4 5% 35%	5780
February	1st to 10th	Day	13% 10% 4 12% 5% 5% 5% 4 5% 6% 31%	1890
	11th to 20th	Day	16% 11% 4 11% 6% 5% 4 3 6% 6% 29%	1967
	21st to end	Day	16% 11% 5% 11% 5% 4 4 4 4 6% 31%	1740
March	1st to 10th	Day	17% 11% 6% 8% 6% 4 4 3 4 6% 30%	5045
	11th to 20th	Day	10% 9% 3 7% 4 4 4 4 6% 7% 44%	5090
	21st to end	Day	13% 9% 3 7% 6% 5% 5% 4 6% 6% 36%	5586
April	1st to 10th	Day	12% 11% 4 6% 5% 4 5% 3 6% 8% 37%	2326
	11th to 20th	Day	12% 9% 3 6% 5% 4 4 3 6% 6% 40%	2535
	21st to end	Day	16% 8% 3 6% 5% 4 5% 4 5% 6% 37%	2730
May	1st to 10th	Day	12% 9% 3 9% 6% 5% 6% 5% 7% 8% 29%	7616
	11th to 20th	Day	15% 7% 3 8% 5% 6% 5% 5% 7% 8% 31%	7626
	21st to end	Day	16% 8% 3 8% 6% 6% 6% 5% 7% 9% 26%	8391
June	1st to 10th	Day	11% 5% 3 8% 6% 6% 6% 5% 6% 9% 36%	2730
	11th to 20th	Day	9% 5% 2 7% 5% 6% 7% 6% 8% 10% 35%	2730
	21st to end	Day	9% 6% 2 7% 5% 6% 6% 6% 7% 9% 37%	2730
July	1st to 10th	Day	6% 5% 2 8% 6% 6% 7% 6% 8% 10% 36%	7680
	11th to 20th	Day	10% 6% 3 8% 6% 6% 6% 5% 8% 11% 31%	7680
	21st to end	Day	11% 8% 3 10% 7% 7% 7% 5% 7% 9% 26%	8340
August	1st to 10th	Day	10% 7% 3 9% 7% 7% 7% 6% 8% 11% 26%	4364
	11th to 20th	Day	9% 6% 3 8% 6% 7% 7% 6% 9% 11% 28%	4226
	21st to end	Day	5% 4 2 6% 4 5% 6% 5% 6% 11% 47%	4459
September	1st to 10th	Day	10% 6% 3 7% 5% 5% 5% 4 5% 6% 43%	2260
	11th to 20th	Day	12% 8% 3 7% 5% 6% 5% 4 6% 8% 37%	2200
	21st to end	Day	19% 8% 3 7% 5% 4 5% 3 5% 7% 32%	2200
October	1st to 10th	Day	14% 7% 2 7% 4 3 4 3 6% 6% 45%	2070
	11th to 20th	Day	14% 8% 3 7% 3 3 4 4 4 6% 44%	2000
	21st to end	Day	15% 11% 3 7% 4 4 4 3 3 6% 41%	2200
November	1st to 10th	Day	9% 7% 3 7% 3 4 4 4 6% 7% 46%	2004
	11th to 20th	Day	11% 9% 4 8% 5% 4 5% 3 5% 8% 39%	1890
	21st to end	Day	12% 11% 4 7% 5% 4 5% 4 5% 6% 38%	1890
December	1st to 10th	Day	12% 11% 5% 11% 5% 4 4 3 5% 6% 33%	3020
	11th to 20th	Day	18% 14% 6% 9% 5% 4 4 4 5% 6% 26%	3463
	21st to end	Day	14% 11% 6% 11% 6% 6% 6% 5% 6% 6% 23%	4565
January	1st to 10th	Night	10% 13% 7% 16% 9% 5% 4 3 5% 5% 24%	7635
	11th to 20th	Night	11% 10% 5% 14% 7% 5% 4 3 4 5% 32%	7680
	21st to end	Night	13% 10% 3 10% 7% 6% 4 4 5% 5% 32%	8401
February	1st to 10th	Night	13% 11% 5% 10% 5% 5% 4 5% 5% 7% 31%	2730
	11th to 20th	Night	17% 11% 4 12% 7% 5% 4 4 4 5% 28%	2534
	21st to end	Night	13% 11% 5% 13% 6% 5% 4 4 5% 5% 29%	2065
March	1st to 10th	Night	16% 11% 3 6% 4 4 4 3 4 7% 37%	5028
	11th to 20th	Night	11% 7% 3 6% 4 4 4 3 5% 7% 47%	5090
	21st to end	Night	11% 8% 3 7% 5% 5% 5% 4 6% 7% 38%	5588
April	1st to 10th	Night	10% 11% 3 7% 5% 4 5% 4 5% 8% 37%	2294
	11th to 20th	Night	10% 9% 2 6% 5% 4 4 4 7% 8% 41%	2051
	21st to end	Night	12% 7% 3 8% 6% 6% 5% 3 6% 7% 38%	1890
May	1st to 10th	Night	14% 9% 3 8% 6% 5% 5% 4 7% 8% 32%	5237
	11th to 20th	Night	14% 8% 3 7% 6% 5% 5% 4 7% 9% 33%	5234
	21st to end	Night	20% 9% 3 9% 6% 5% 5% 4 5% 7% 27%	5761
June	1st to 10th	Night	10% 5% 2 6% 5% 5% 5% 4 7% 9% 41%	1890
	11th to 20th	Night	8% 6% 2 7% 6% 5% 5% 4 8% 10% 41%	1890
	21st to end	Night	8% 6% 2 5% 5% 5% 5% 4 8% 11% 41%	1890
July	1st to 10th	Night	5% 5% 2 8% 6% 6% 6% 5% 8% 10% 39%	5278
	11th to 20th	Night	8% 7% 3 9% 6% 5% 6% 5% 7% 9% 36%	5277
	21st to end	Night	10% 9% 4 10% 7% 6% 7% 5% 7% 8% 27%	5736
August	1st to 10th	Night	11% 7% 3 9% 5% 6% 5% 5% 7% 8% 33%	3005
	11th to 20th	Night	8% 7% 3 8% 5% 6% 6% 5% 7% 8% 38%	2911
	21st to end	Night	5% 4 1 5% 4 4 4 3 6% 10% 54%	3406
September	1st to 10th	Night	9% 7% 2 7% 5% 4 4 4 5% 6% 48%	2135
	11th to 20th	Night	12% 7% 3 6% 3 4 5% 3 5% 7% 46%	2200
	21st to end	Night	14% 10% 3 7% 4 4 4 4 6% 7% 39%	2200
October	1st to 10th	Night	13% 6% 2 4 5% 3 4 4 4 6% 50%	2330
	11th to 20th	Night	11% 9% 3 6% 5% 5% 4 3 4 6% 46%	2400
	21st to end	Night	12% 10% 3 7% 4 3 4 3 4 5% 45%	2640
November	1st to 10th	Night	10% 9% 3 6% 4 5% 4 3 4 5% 47%	2510
	11th to 20th	Night	11% 10% 3 7% 5% 4 5% 3 5% 6% 40%	2730
	21st to end	Night	11% 10% 3 9% 5% 4 4 3 5% 6% 39%	2730
December	1st to 10th	Night	11% 8% 4 10% 7% 5% 5% 4 6% 7% 33%	4380
	11th to 20th	Night	16% 11% 7% 13% 5% 5% 4 3 5% 6% 26%	4952
	21st to end	Night	14% 10% 6% 12% 7% 6% 6% 5% 5% 7% 22%	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	55% 4 10% 17% 13% 1	5259
	11th to 20th	Day	55% 4 5% 16% 17% 4	5280
	21st to end	Day	51% 3 8% 26% 12% 1	5780
February	1st to 10th	Day	52% 4 8% 21% 13% 1	1890
	11th to 20th	Day	55% 4 8% 19% 12% 2	1976
	21st to end	Day	53% 4 8% 18% 13% 4	1740
March	1st to 10th	Day	51% 6% 7% 17% 13% 5%	5045
	11th to 20th	Day	38% 4 8% 22% 23% 5%	5090
	21st to end	Day	45% 5% 9% 23% 15% 2	5586
April	1st to 10th	Day	44% 4 11% 24% 13% 3	2326
	11th to 20th	Day	42% 4 11% 24% 16% 3	2535
	21st to end	Day	46% 5% 12% 24% 12% 2	2730
May	1st to 10th	Day	48% 7% 11% 22% 12% 1	7651
	11th to 20th	Day	47% 8% 13% 24% 8%	7630
	21st to end	Day	49% 8% 12% 17% 10% 3	8405
June	1st to 10th	Day	42% 7% 14% 22% 14%	2730
	11th to 20th	Day	39% 9% 16% 21% 14% 1	2730
	21st to end	Day	39% 9% 15% 22% 13% 1	2730
July	1st to 10th	Day	38% 12% 16% 22% 10% 2	7615
	11th to 20th	Day	43% 11% 15% 24% 6%	7611
	21st to end	Day	49% 10% 12% 19% 10%	8156
August	1st to 10th	Day	45% 11% 18% 20% 6%	4351
	11th to 20th	Day	41% 10% 15% 24% 10%	4265
	21st to end	Day	29% 8% 18% 31% 13% 1	4459
September	1st to 10th	Day	39% 7% 12% 22% 17% 4	2260
	11th to 20th	Day	45% 5% 9% 23% 16% 2	2200
	21st to end	Day	50% 6% 10% 19% 14% 2	2200
October	1st to 10th	Day	30% 6% 9% 20% 29% 6%	3369
	11th to 20th	Day	31% 3 9% 25% 18% 14%	3240
	21st to end	Day	32% 3 8% 30% 15% 13%	3538
November	1st to 10th	Day	35% 4 10% 24% 23% 3	2004
	11th to 20th	Day	43% 4 8% 23% 19% 3	1890
	21st to end	Day	45% 3 10% 24% 15% 2	1890
December	1st to 10th	Day	50% 5% 8% 21% 15% 1	3020
	11th to 20th	Day	57% 4 9% 16% 13% 1	3460
	21st to end	Day	57% 5% 10% 21% 7% 1	4565
January	1st to 10th	Night	57% 6% 10% 18% 8% 1	7636
	11th to 20th	Night	50% 4 6% 18% 19% 3	7680
	21st to end	Night	50% 4 9% 23% 13% 1	8401
February	1st to 10th	Night	50% 3 14% 19% 13% 1	2730
	11th to 20th	Night	58% 3 8% 18% 10% 3	2536
	21st to end	Night	55% 4 9% 18% 10% 4	2065
March	1st to 10th	Night	46% 5% 6% 24% 15% 4	5028
	11th to 20th	Night	37% 4 7% 25% 23% 4	5090
	21st to end	Night	42% 6% 12% 23% 15% 2	5588
April	1st to 10th	Night	44% 5% 13% 22% 14% 2	2294
	11th to 20th	Night	39% 4 12% 24% 17% 4	2051
	21st to end	Night	42% 6% 14% 25% 12% 1	1890
May	1st to 10th	Night	47% 7% 14% 20% 11% 1	5264
	11th to 20th	Night	45% 8% 15% 24% 8%	5235
	21st to end	Night	54% 8% 12% 18% 6% 2	5771
June	1st to 10th	Night	36% 10% 17% 22% 15% 1	1890
	11th to 20th	Night	35% 9% 20% 23% 12% 1	1890
	21st to end	Night	34% 8% 17% 25% 14% 2	1890
July	1st to 10th	Night	36% 13% 17% 23% 10% 1	5235
	11th to 20th	Night	40% 10% 17% 26% 6% 1	5226
	21st to end	Night	47% 12% 13% 18% 10%	5606
August	1st to 10th	Night	44% 9% 19% 22% 6%	2994
	11th to 20th	Night	38% 9% 15% 28% 10%	2938
	21st to end	Night	26% 6% 14% 37% 16% 1	3406
September	1st to 10th	Night	36% 7% 14% 22% 16% 5%	2135
	11th to 20th	Night	38% 6% 10% 25% 20% 1	2200
	21st to end	Night	45% 6% 11% 24% 14% 1	2200
October	1st to 10th	Night	30% 5% 8% 24% 29% 4	3811
	11th to 20th	Night	30% 5% 9% 23% 20% 13%	3899
	21st to end	Night	25% 3 9% 31% 21% 12%	4252
November	1st to 10th	Night	37% 4 9% 23% 23% 4	2510
	11th to 20th	Night	42% 4 9% 21% 19% 4	2730
	21st to end	Night	45% 2 10% 23% 17% 3	2730
December	1st to 10th	Night	45% 7% 11% 25% 11% 1	4380
	11th to 20th	Night	58% 5% 9% 18% 9% 1	4954
	21st to end	Night	56% 6% 11% 18% 9%	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	42% 26% 21% 8% 3 1	330
	11th to 20th	Day	42% 22% 27% 8% 1	330
	21st to end	Day	39% 24% 24% 10% 2	363
February	1st to 10th	Day	31% 25% 28% 14% 2	330
	11th to 20th	Day	49% 21% 20% 8% 1	330
	21st to end	Day	38% 25% 28% 7% 1	283
March	1st to 10th	Day	30% 21% 24% 18% 6% 1	540
	11th to 20th	Day	31% 23% 24% 16% 4 1	540
	21st to end	Day	29% 21% 28% 16% 6%	594
April	1st to 10th	Day	28% 21% 24% 18% 9% 1	540
	11th to 20th	Day	23% 17% 30% 18% 9% 2	532
	21st to end	Day	26% 14% 28% 19% 11% 2	540
May	1st to 10th	Day	26% 17% 28% 17% 8% 4	543
	11th to 20th	Day	21% 11% 29% 20% 13% 5%	567
	21st to end	Day	20% 9% 22% 23% 15% 11%	617
June	1st to 10th	Day	12% 8% 28% 25% 19% 9%	570
	11th to 20th	Day	9% 10% 26% 28% 17% 10%	570
	21st to end	Day	11% 9% 24% 28% 17% 11%	570
July	1st to 10th	Day	12% 4 18% 27% 23% 17%	565
	11th to 20th	Day	9% 3 19% 32% 23% 14%	564
	21st to end	Day	13% 6% 19% 25% 24% 13%	620
August	1st to 10th	Day	12% 6% 21% 25% 23% 14%	566
	11th to 20th	Day	11% 4 21% 25% 24% 16%	535
	21st to end	Day	9% 4 18% 27% 24% 18%	583
September	1st to 10th	Day	10% 6% 17% 28% 25% 13%	530
	11th to 20th	Day	14% 5% 12% 28% 28% 13%	530
	21st to end	Day	25% 9% 17% 29% 15% 4	530
October	1st to 10th	Day	18% 6% 19% 26% 24% 6%	530
	11th to 20th	Day	16% 17% 22% 23% 18% 3	530
	21st to end	Day	25% 13% 26% 20% 14% 3	583
November	1st to 10th	Day	18% 14% 29% 24% 11% 3	482
	11th to 20th	Day	29% 17% 24% 23% 5% 2	330
	21st to end	Day	29% 21% 28% 18% 4 1	330
December	1st to 10th	Day	35% 22% 27% 12% 4	330
	11th to 20th	Day	33% 20% 28% 12% 6% 1	330
	21st to end	Day	29% 21% 26% 17% 5% 2	363
January	1st to 10th	Night	27% 24% 26% 20% 3	840
	11th to 20th	Night	32% 19% 27% 20% 2	840
	21st to end	Night	26% 22% 31% 19% 2	924
February	1st to 10th	Night	27% 19% 28% 25% 2	840
	11th to 20th	Night	31% 24% 28% 16% 1	823
	21st to end	Night	26% 22% 33% 18% 1	692
March	1st to 10th	Night	25% 16% 32% 25% 3	840
	11th to 20th	Night	27% 18% 26% 22% 6%	840
	21st to end	Night	20% 18% 31% 24% 6%	924
April	1st to 10th	Night	20% 18% 28% 28% 6%	840
	11th to 20th	Night	19% 14% 27% 30% 10% 1	807
	21st to end	Night	16% 13% 25% 34% 10%	630
May	1st to 10th	Night	16% 10% 27% 32% 14% 1	630
	11th to 20th	Night	16% 7% 21% 35% 20% 1	621
	21st to end	Night	17% 4 14% 32% 28% 4	683
June	1st to 10th	Night	10% 3 16% 40% 27% 4	630
	11th to 20th	Night	9% 3 16% 35% 32% 4	630
	21st to end	Night	8% 3 13% 40% 31% 3	630
July	1st to 10th	Night	8% 2 11% 35% 40% 4	615
	11th to 20th	Night	7% 2 9% 34% 43% 6%	612
	21st to end	Night	8% 3 10% 38% 37% 5%	690
August	1st to 10th	Night	12% 3 8% 36% 37% 4	627
	11th to 20th	Night	12% 2 10% 34% 38% 3	606
	21st to end	Night	10% 3 8% 34% 38% 7%	765
September	1st to 10th	Night	11% 4 9% 34% 36% 6%	800
	11th to 20th	Night	15% 3 10% 33% 34% 5%	800
	21st to end	Night	18% 6% 14% 36% 25% 1	800
October	1st to 10th	Night	16% 7% 17% 30% 27% 4	800
	11th to 20th	Night	16% 12% 23% 33% 16% 1	800
	21st to end	Night	20% 12% 20% 35% 12% 2	880
November	1st to 10th	Night	17% 9% 24% 33% 15% 1	820
	11th to 20th	Night	21% 14% 23% 30% 11%	840
	21st to end	Night	20% 15% 24% 31% 9% 1	840
December	1st to 10th	Night	26% 18% 28% 22% 5%	840
	11th to 20th	Night	23% 20% 27% 26% 5%	840
	21st to end	Night	26% 16% 25% 29% 4	924

Page generated at 2026-08-12 03:37:13. Version ac07

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