Condon Peak Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Condon Peak Campground clear sky chart from 2005-11-06 to 2025-12-18.

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	3 4 1 4 3 2 3 2 4 5% 69%	135355
	Night	4 4 1 4 3 3 3 3 4 5% 67%	133170
Transparency	Day	18% 3 6% 17% 28% 27%	130362
	Night	20% 4 7% 16% 26% 27%	129142
Seeing	Day	8% 9% 21% 33% 22% 7%	16894
	Night	7% 5% 13% 32% 33% 10%	26427

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	5% 5% 2 5% 3 4 3 3 4 7% 58%	3774
	11th to 20th	Day	5% 4 1 5% 4 4 4 3 4 6% 58%	4100
	21st to end	Day	9% 8% 3 7% 4 4 5% 4 4 6% 46%	4510
February	1st to 10th	Day	12% 8% 3 6% 3 3 3 3 6% 5% 48%	1835
	11th to 20th	Day	8% 6% 3 6% 5% 5% 4 3 4 6% 50%	1950
	21st to end	Day	9% 10% 3 7% 4 3 4 3 5% 6% 46%	1650
March	1st to 10th	Day	8% 9% 3 10% 6% 5% 6% 5% 5% 7% 37%	4644
	11th to 20th	Day	5% 7% 4 8% 4 4 4 3 5% 7% 50%	5000
	21st to end	Day	5% 9% 4 9% 5% 5% 5% 4 5% 7% 43%	5736
April	1st to 10th	Day	7% 8% 3 6% 4 4 3 4 5% 6% 52%	2400
	11th to 20th	Day	6% 6% 2 5% 4 4 3 3 5% 6% 56%	2369
	21st to end	Day	5% 5% 1 4 3 3 3 3 5% 7% 62%	2400
May	1st to 10th	Day	2 3 1 3 2 2 2 2 3 4 75%	5440
	11th to 20th	Day	1 1 2 2 2 2 2 4 5% 79%	5859
	21st to end	Day	2 1 2 2 1 2 2 3 5% 81%	6902
June	1st to 10th	Day	2 2 1 3 2 2 3 3 5% 6% 70%	2800
	11th to 20th	Day	1 1 1 1 1 2 1 2 4 86%	2800
	21st to end	Day	1 1 1 1 1 1 1 1 2 4 86%	2800
July	1st to 10th	Day	1 1 1 1 2 94%	6319
	11th to 20th	Day	1 1 1 1 1 1 1 2 2 88%	6060
	21st to end	Day	1 1 1 1 1 2 3 5% 85%	6402
August	1st to 10th	Day	1 1 1 1 1 1 1 2 2 88%	5612
	11th to 20th	Day	1 1 3 93%	5364
	21st to end	Day	1 1 1 1 1 2 3 88%	5984
September	1st to 10th	Day	1 1 1 1 1 1 2 3 90%	2400
	11th to 20th	Day	1 1 1 2 2 2 2 2 3 5% 79%	2400
	21st to end	Day	2 2 1 1 2 1 3 2 3 4 79%	2188
October	1st to 10th	Day	2 2 2 2 2 3 3 4 4 77%	3280
	11th to 20th	Day	2 2 1 2 2 2 2 2 3 4 78%	3261
	21st to end	Day	2 3 2 4 3 3 3 3 4 6% 66%	3558
November	1st to 10th	Day	4 4 1 6% 4 3 3 4 5% 8% 59%	1944
	11th to 20th	Day	6% 4 2 5% 3 3 4 4 5% 6% 59%	1890
	21st to end	Day	6% 6% 2 5% 4 3 4 4 5% 7% 55%	1890
December	1st to 10th	Day	4 5% 2 6% 4 4 4 4 6% 6% 55%	2746
	11th to 20th	Day	11% 9% 2 7% 4 3 4 4 5% 7% 44%	3084
	21st to end	Day	7% 8% 3 8% 6% 4 5% 4 8% 10% 37%	4004
January	1st to 10th	Night	5% 6% 2 5% 3 3 3 3 5% 9% 56%	6174
	11th to 20th	Night	5% 7% 2 6% 4 3 3 2 5% 6% 56%	5880
	21st to end	Night	8% 6% 2 5% 5% 5% 4 3 5% 7% 48%	6468
February	1st to 10th	Night	8% 8% 3 6% 5% 3 4 3 6% 6% 49%	2562
	11th to 20th	Night	6% 7% 2 4 4 3 4 3 6% 8% 53%	2338
	21st to end	Night	5% 5% 2 7% 5% 4 3 3 5% 7% 54%	1980
March	1st to 10th	Night	6% 9% 3 10% 6% 5% 6% 5% 6% 7% 38%	5247
	11th to 20th	Night	4 5% 2 7% 5% 5% 5% 4 5% 6% 54%	5000
	21st to end	Night	7% 7% 3 6% 5% 4 4 3 5% 8% 47%	5237
April	1st to 10th	Night	4 5% 1 5% 5% 3 5% 4 5% 7% 56%	2000
	11th to 20th	Night	4 3 2 5% 3 4 3 3 4 6% 63%	1979
	21st to end	Night	3 2 1 2 2 3 3 3 5% 7% 68%	2000
May	1st to 10th	Night	1 1 2 1 1 2 2 3 5% 82%	4560
	11th to 20th	Night	1 1 1 1 1 1 2 3 5% 84%	4045
	21st to end	Night	1 1 1 1 1 1 1 2 2 90%	3972
June	1st to 10th	Night	2 2 1 3 2 2 2 2 3 5% 77%	1600
	11th to 20th	Night	1 1 1 1 1 2 2 3 88%	1600
	21st to end	Night	1 1 1 1 1 1 2 3 90%	1600
July	1st to 10th	Night	1 1 96%	3640
	11th to 20th	Night	1 1 1 1 1 1 1 1 1 92%	3906
	21st to end	Night	1 1 1 1 1 1 2 3 88%	4472
August	1st to 10th	Night	1 1 1 1 1 1 1 2 90%	4204
	11th to 20th	Night	1 1 1 1 1 1 94%	4506
	21st to end	Night	1 1 1 1 1 2 2 90%	5015
September	1st to 10th	Night	1 1 1 1 1 1 1 3 89%	2000
	11th to 20th	Night	2 1 1 2 1 1 1 2 2 3 85%	2000
	21st to end	Night	1 1 2 1 1 2 2 3 4 83%	2207
October	1st to 10th	Night	2 1 2 2 2 2 2 3 4 81%	3920
	11th to 20th	Night	1 2 1 2 2 2 3 2 3 4 78%	3897
	21st to end	Night	2 3 2 2 1 2 2 2 4 6% 73%	4253
November	1st to 10th	Night	2 2 1 4 4 3 3 3 5% 8% 65%	2571
	11th to 20th	Night	4 5% 2 5% 3 3 3 3 6% 8% 58%	2730
	21st to end	Night	4 5% 2 5% 4 4 5% 3 6% 7% 55%	2730
December	1st to 10th	Night	4 4 2 4 4 4 4 4 5% 8% 58%	4651
	11th to 20th	Night	10% 9% 3 6% 4 4 4 4 8% 8% 39%	5274
	21st to end	Night	7% 8% 3 9% 6% 6% 6% 5% 6% 9% 35%	6952

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	25% 5% 14% 28% 19% 9%	3774
	11th to 20th	Day	28% 5% 8% 13% 20% 26%	4100
	21st to end	Day	38% 5% 7% 14% 21% 16%	4510
February	1st to 10th	Day	35% 5% 7% 20% 21% 13%	1835
	11th to 20th	Day	34% 5% 9% 19% 24% 9%	1960
	21st to end	Day	36% 7% 8% 19% 23% 7%	1650
March	1st to 10th	Day	39% 8% 12% 14% 22% 4	4644
	11th to 20th	Day	31% 5% 10% 29% 16% 8%	5000
	21st to end	Day	37% 8% 10% 23% 19% 3	5736
April	1st to 10th	Day	31% 6% 10% 23% 21% 9%	2400
	11th to 20th	Day	27% 5% 9% 26% 25% 8%	2372
	21st to end	Day	21% 5% 9% 30% 28% 7%	2400
May	1st to 10th	Day	14% 3 6% 25% 38% 15%	5440
	11th to 20th	Day	8% 2 5% 25% 44% 15%	5862
	21st to end	Day	9% 2 4 26% 48% 11%	6904
June	1st to 10th	Day	14% 4 8% 20% 36% 18%	2800
	11th to 20th	Day	5% 1 4 15% 39% 34%	2800
	21st to end	Day	6% 1 2 7% 32% 51%	2800
July	1st to 10th	Day	2 1 2 22% 73%	6251
	11th to 20th	Day	6% 1 2 3 20% 68%	5986
	21st to end	Day	4 1 2 12% 34% 47%	6217
August	1st to 10th	Day	7% 1 2 9% 31% 49%	4085
	11th to 20th	Day	3 1 1 6% 29% 61%	3880
	21st to end	Day	5% 1 2 10% 29% 54%	4311
September	1st to 10th	Day	4 1 3 9% 33% 50%	2400
	11th to 20th	Day	9% 2 4 15% 42% 28%	2400
	21st to end	Day	10% 2 3 16% 39% 30%	2188
October	1st to 10th	Day	11% 2 4 11% 21% 50%	3280
	11th to 20th	Day	12% 2 4 21% 34% 27%	3261
	21st to end	Day	19% 3 4 14% 39% 22%	3558
November	1st to 10th	Day	22% 5% 8% 19% 28% 18%	1944
	11th to 20th	Day	24% 4 9% 21% 28% 13%	1890
	21st to end	Day	28% 4 7% 17% 26% 17%	1890
December	1st to 10th	Day	28% 4 6% 15% 28% 19%	2746
	11th to 20th	Day	39% 5% 9% 17% 19% 11%	3084
	21st to end	Day	38% 8% 15% 21% 11% 6%	4004
January	1st to 10th	Night	24% 6% 11% 26% 22% 10%	6174
	11th to 20th	Night	28% 5% 8% 15% 21% 23%	5880
	21st to end	Night	35% 6% 7% 14% 17% 21%	6468
February	1st to 10th	Night	33% 6% 8% 17% 22% 14%	2562
	11th to 20th	Night	28% 5% 10% 18% 29% 10%	2339
	21st to end	Night	29% 6% 9% 24% 22% 9%	1980
March	1st to 10th	Night	40% 9% 11% 15% 18% 7%	5247
	11th to 20th	Night	28% 7% 12% 26% 18% 9%	5000
	21st to end	Night	32% 10% 14% 22% 19% 4	5237
April	1st to 10th	Night	27% 7% 12% 23% 21% 10%	2000
	11th to 20th	Night	21% 5% 13% 25% 25% 11%	1979
	21st to end	Night	15% 6% 11% 29% 31% 9%	2000
May	1st to 10th	Night	8% 3 7% 30% 35% 17%	4557
	11th to 20th	Night	5% 1 6% 20% 45% 23%	4046
	21st to end	Night	4 1 4 21% 45% 25%	3972
June	1st to 10th	Night	12% 3 9% 18% 34% 24%	1600
	11th to 20th	Night	5% 2 4 14% 37% 38%	1600
	21st to end	Night	3 1 2 8% 31% 56%	1600
July	1st to 10th	Night	2 1 2 15% 80%	3600
	11th to 20th	Night	4 2 2 17% 75%	3857
	21st to end	Night	4 1 2 10% 30% 53%	4345
August	1st to 10th	Night	7% 1 1 7% 27% 57%	3050
	11th to 20th	Night	3 1 1 4 24% 67%	3256
	21st to end	Night	4 1 2 5% 28% 60%	3608
September	1st to 10th	Night	5% 1 3 7% 25% 59%	2000
	11th to 20th	Night	8% 2 2 13% 36% 38%	2000
	21st to end	Night	7% 2 4 14% 41% 33%	2207
October	1st to 10th	Night	10% 2 3 11% 20% 54%	3920
	11th to 20th	Night	12% 2 4 15% 38% 28%	3897
	21st to end	Night	14% 2 5% 13% 41% 26%	4253
November	1st to 10th	Night	18% 4 9% 19% 28% 22%	2571
	11th to 20th	Night	23% 4 11% 18% 27% 16%	2730
	21st to end	Night	27% 5% 9% 14% 26% 19%	2730
December	1st to 10th	Night	25% 3 5% 16% 27% 23%	4651
	11th to 20th	Night	38% 7% 10% 13% 19% 12%	5274
	21st to end	Night	42% 8% 12% 20% 13% 5%	6952

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% 13% 29% 20% 12%	257
	11th to 20th	Day	15% 13% 26% 27% 17% 3	400
	21st to end	Day	15% 12% 25% 28% 16% 4	440
February	1st to 10th	Day	20% 17% 24% 21% 14% 5%	417
	11th to 20th	Day	17% 16% 26% 27% 12% 2	495
	21st to end	Day	14% 18% 27% 29% 11% 1	414
March	1st to 10th	Day	20% 15% 28% 27% 10% 1	500
	11th to 20th	Day	20% 16% 23% 25% 14% 2	500
	21st to end	Day	16% 18% 30% 26% 9% 1	550
April	1st to 10th	Day	13% 15% 27% 27% 15% 3	500
	11th to 20th	Day	11% 16% 25% 30% 13% 5%	492
	21st to end	Day	6% 15% 26% 31% 15% 7%	500
May	1st to 10th	Day	9% 10% 31% 30% 16% 4	503
	11th to 20th	Day	6% 11% 27% 30% 18% 7%	528
	21st to end	Day	5% 11% 21% 33% 22% 9%	573
June	1st to 10th	Day	3 5% 21% 37% 22% 11%	530
	11th to 20th	Day	2 7% 22% 38% 23% 7%	530
	21st to end	Day	1 4 19% 38% 24% 14%	530
July	1st to 10th	Day	1 1 13% 41% 30% 14%	526
	11th to 20th	Day	2 7% 41% 35% 15%	524
	21st to end	Day	1 1 8% 42% 33% 15%	575
August	1st to 10th	Day	3 2 16% 43% 26% 11%	527
	11th to 20th	Day	1 1 12% 41% 31% 14%	517
	21st to end	Day	1 1 8% 38% 37% 16%	583
September	1st to 10th	Day	1 4 14% 36% 34% 11%	530
	11th to 20th	Day	3 4 18% 38% 29% 7%	530
	21st to end	Day	2 6% 17% 37% 32% 6%	530
October	1st to 10th	Day	3 8% 21% 39% 25% 4	530
	11th to 20th	Day	5% 8% 20% 36% 25% 6%	530
	21st to end	Day	5% 7% 22% 33% 26% 7%	583
November	1st to 10th	Day	7% 9% 17% 28% 34% 4	420
	11th to 20th	Day	11% 11% 22% 31% 21% 5%	330
	21st to end	Day	9% 10% 25% 32% 19% 5%	330
December	1st to 10th	Day	14% 8% 25% 29% 19% 5%	236
	11th to 20th	Day	11% 15% 24% 27% 17% 5%	214
	21st to end	Day	19% 17% 26% 22% 11% 4	220
January	1st to 10th	Night	16% 7% 17% 30% 21% 9%	800
	11th to 20th	Night	11% 6% 16% 36% 24% 9%	800
	21st to end	Night	14% 6% 15% 36% 23% 7%	880
February	1st to 10th	Night	16% 8% 14% 32% 23% 7%	800
	11th to 20th	Night	12% 10% 16% 32% 24% 7%	784
	21st to end	Night	10% 10% 19% 40% 18% 4	660
March	1st to 10th	Night	14% 9% 19% 32% 22% 4	800
	11th to 20th	Night	10% 9% 18% 30% 25% 8%	800
	21st to end	Night	12% 9% 20% 32% 24% 4	880
April	1st to 10th	Night	8% 10% 18% 37% 23% 4	800
	11th to 20th	Night	7% 10% 18% 31% 26% 7%	791
	21st to end	Night	4 8% 21% 32% 27% 9%	800
May	1st to 10th	Night	3 6% 20% 36% 27% 8%	800
	11th to 20th	Night	3 4 17% 34% 34% 8%	589
	21st to end	Night	2 6% 12% 33% 41% 6%	433
June	1st to 10th	Night	2 3 12% 35% 43% 6%	400
	11th to 20th	Night	3 12% 38% 38% 9%	400
	21st to end	Night	1 1 6% 32% 50% 10%	400
July	1st to 10th	Night	1 1 2 28% 58% 11%	390
	11th to 20th	Night	1 1 19% 61% 19%	497
	21st to end	Night	1 1 18% 57% 23%	657
August	1st to 10th	Night	1 4 26% 53% 16%	666
	11th to 20th	Night	1 4 28% 54% 13%	792
	21st to end	Night	1 3 22% 58% 16%	880
September	1st to 10th	Night	1 1 5% 28% 51% 15%	800
	11th to 20th	Night	3 1 7% 33% 43% 14%	800
	21st to end	Night	2 1 10% 29% 44% 14%	800
October	1st to 10th	Night	4 4 9% 35% 37% 12%	800
	11th to 20th	Night	5% 2 11% 35% 35% 12%	800
	21st to end	Night	4 3 12% 33% 33% 16%	880
November	1st to 10th	Night	4 8% 11% 32% 34% 11%	820
	11th to 20th	Night	8% 4 16% 34% 29% 9%	840
	21st to end	Night	7% 5% 17% 35% 28% 9%	840
December	1st to 10th	Night	13% 5% 14% 37% 26% 6%	840
	11th to 20th	Night	14% 7% 16% 34% 24% 5%	828
	21st to end	Night	14% 12% 19% 32% 19% 4	880

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