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 2024-11-11.

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	4 4 1 4 3 3 3 2 4 5% 68%	104953
	Night	4 4 2 4 3 3 3 3 4 5% 66%	102979
Transparency	Day	19% 4 6% 16% 27% 28%	104707
	Night	20% 5% 7% 16% 25% 27%	102815
Seeing	Day	8% 9% 21% 33% 23% 7%	15472
	Night	7% 5% 12% 32% 34% 10%	24965

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	6% 7% 3 8% 4 5% 4 3 4 7% 48%	2632
	11th to 20th	Day	8% 6% 2 7% 6% 6% 6% 4 6% 8% 40%	2860
	21st to end	Day	12% 10% 3 8% 5% 4 5% 4 5% 8% 37%	3146
February	1st to 10th	Day	12% 7% 3 5% 3 3 3 3 6% 5% 49%	1743
	11th to 20th	Day	8% 6% 3 6% 5% 5% 4 3 4 6% 50%	1850
	21st to end	Day	9% 11% 3 7% 4 3 4 3 5% 6% 46%	1570
March	1st to 10th	Day	7% 9% 3 11% 7% 5% 6% 6% 6% 8% 32%	3225
	11th to 20th	Day	5% 6% 3 6% 3 4 4 3 4 7% 56%	3490
	21st to end	Day	7% 11% 3 9% 6% 5% 5% 4 5% 6% 40%	3997
April	1st to 10th	Day	7% 9% 3 6% 4 4 3 3 5% 6% 51%	2280
	11th to 20th	Day	6% 6% 2 4 4 4 3 3 5% 6% 56%	2249
	21st to end	Day	5% 4 1 3 3 3 3 3 5% 7% 64%	2280
May	1st to 10th	Day	3 3 1 3 2 2 2 2 3 5% 74%	3800
	11th to 20th	Day	2 2 1 2 2 2 2 2 3 4 79%	4076
	21st to end	Day	2 2 1 2 2 2 2 2 3 4 79%	4813
June	1st to 10th	Day	2 2 1 3 2 2 3 3 5% 6% 69%	2660
	11th to 20th	Day	1 1 1 1 1 2 1 2 4 86%	2660
	21st to end	Day	1 1 1 1 1 1 1 1 2 4 86%	2660
July	1st to 10th	Day	1 1 1 1 1 2 2 92%	4420
	11th to 20th	Day	2 2 1 2 2 1 2 2 2 3 82%	4238
	21st to end	Day	1 1 1 1 1 1 1 2 3 87%	4455
August	1st to 10th	Day	1 1 1 1 1 2 2 3 3 83%	3974
	11th to 20th	Day	1 1 1 1 1 1 2 92%	3724
	21st to end	Day	1 1 1 1 1 1 2 2 90%	4180
September	1st to 10th	Day	1 1 1 1 1 1 2 3 90%	2280
	11th to 20th	Day	1 1 1 2 2 1 2 2 3 5% 80%	2280
	21st to end	Day	2 2 1 1 1 1 3 2 3 4 80%	2079
October	1st to 10th	Day	2 2 2 2 2 3 3 4 4 76%	3180
	11th to 20th	Day	2 2 1 2 2 2 2 2 3 4 78%	3161
	21st to end	Day	2 3 2 4 3 3 3 4 4 6% 65%	3448
November	1st to 10th	Day	4 4 1 6% 4 3 3 4 5% 7% 59%	1850
	11th to 20th	Day	5% 4 2 5% 3 2 4 3 5% 6% 61%	1710
	21st to end	Day	6% 6% 2 5% 4 4 4 3 5% 7% 55%	1710
December	1st to 10th	Day	6% 7% 2 6% 5% 4 5% 4 7% 7% 48%	1551
	11th to 20th	Day	17% 14% 3 8% 4 3 3 3 5% 6% 34%	1928
	21st to end	Day	9% 10% 3 8% 6% 4 4 4 6% 8% 38%	2794
January	1st to 10th	Night	7% 6% 2 7% 4 4 4 3 5% 7% 50%	4313
	11th to 20th	Night	8% 10% 3 9% 6% 5% 5% 3 6% 8% 38%	4110
	21st to end	Night	11% 8% 2 6% 6% 6% 5% 4 7% 7% 39%	4521
February	1st to 10th	Night	8% 8% 3 5% 4 3 4 3 5% 6% 51%	2434
	11th to 20th	Night	5% 6% 2 5% 4 3 4 3 6% 8% 54%	2218
	21st to end	Night	5% 5% 2 7% 5% 4 3 3 5% 7% 53%	1884
March	1st to 10th	Night	6% 10% 4 10% 6% 5% 6% 4 6% 7% 37%	3646
	11th to 20th	Night	3 4 2 5% 4 4 4 3 5% 6% 61%	3490
	21st to end	Night	7% 7% 3 6% 6% 5% 5% 4 6% 8% 44%	3654
April	1st to 10th	Night	4 5% 1 5% 5% 3 5% 4 5% 7% 55%	1900
	11th to 20th	Night	4 3 1 5% 3 4 3 3 4 6% 64%	1879
	21st to end	Night	3 2 1 2 2 3 3 3 5% 7% 69%	1900
May	1st to 10th	Night	1 1 1 2 1 1 2 2 3 5% 81%	3180
	11th to 20th	Night	1 1 1 1 1 1 2 3 4 84%	2819
	21st to end	Night	1 1 1 1 1 1 1 2 2 87%	2762
June	1st to 10th	Night	2 2 1 3 2 2 2 2 3 5% 76%	1520
	11th to 20th	Night	1 1 1 1 2 2 3 88%	1520
	21st to end	Night	1 1 1 1 1 1 2 3 89%	1520
July	1st to 10th	Night	1 1 1 1 1 94%	2540
	11th to 20th	Night	1 1 1 1 1 1 1 2 2 88%	2722
	21st to end	Night	1 1 1 1 1 2 1 2 2 87%	3109
August	1st to 10th	Night	1 1 1 1 1 1 2 1 2 3 86%	2965
	11th to 20th	Night	1 1 1 1 1 1 1 92%	3126
	21st to end	Night	1 1 1 1 1 1 2 91%	3498
September	1st to 10th	Night	1 1 1 1 1 1 1 3 89%	1900
	11th to 20th	Night	1 1 1 2 1 1 1 2 2 3 86%	1900
	21st to end	Night	1 1 1 1 1 2 2 2 4 84%	2096
October	1st to 10th	Night	2 1 2 2 2 2 2 3 4 81%	3800
	11th to 20th	Night	1 2 1 2 2 2 3 2 3 4 79%	3777
	21st to end	Night	2 3 2 2 1 2 2 2 4 6% 73%	4121
November	1st to 10th	Night	3 3 2 4 4 3 3 3 5% 8% 64%	2445
	11th to 20th	Night	4 4 2 4 3 3 3 3 6% 8% 60%	2476
	21st to end	Night	4 5% 2 5% 4 4 5% 3 6% 7% 56%	2470
December	1st to 10th	Night	8% 6% 3 6% 3 3 4 4 5% 8% 50%	2626
	11th to 20th	Night	15% 11% 3 7% 4 4 4 4 6% 7% 35%	3276
	21st to end	Night	9% 8% 3 8% 5% 6% 6% 4 5% 8% 38%	4862

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	33% 6% 13% 29% 15% 4	2632
	11th to 20th	Day	40% 7% 11% 19% 14% 9%	2860
	21st to end	Day	45% 6% 9% 19% 15% 6%	3146
February	1st to 10th	Day	35% 5% 7% 20% 21% 13%	1743
	11th to 20th	Day	33% 5% 8% 18% 25% 9%	1860
	21st to end	Day	36% 7% 8% 18% 24% 6%	1570
March	1st to 10th	Day	40% 11% 15% 14% 15% 4	3225
	11th to 20th	Day	25% 6% 9% 32% 17% 12%	3490
	21st to end	Day	40% 9% 11% 21% 15% 4	3997
April	1st to 10th	Day	32% 5% 10% 23% 20% 10%	2280
	11th to 20th	Day	27% 5% 9% 26% 25% 8%	2252
	21st to end	Day	20% 5% 9% 29% 29% 7%	2280
May	1st to 10th	Day	15% 3 7% 22% 35% 19%	3800
	11th to 20th	Day	10% 2 5% 21% 45% 18%	4079
	21st to end	Day	11% 2 6% 26% 48% 8%	4814
June	1st to 10th	Day	15% 4 9% 19% 36% 19%	2660
	11th to 20th	Day	5% 1 5% 16% 40% 33%	2660
	21st to end	Day	6% 1 3 8% 32% 50%	2660
July	1st to 10th	Day	2 1 1 3 15% 78%	4351
	11th to 20th	Day	9% 1 2 5% 16% 68%	4164
	21st to end	Day	5% 1 2 8% 26% 58%	4315
August	1st to 10th	Day	8% 1 2 10% 31% 49%	3959
	11th to 20th	Day	3 1 1 5% 29% 61%	3760
	21st to end	Day	5% 1 2 10% 28% 55%	4179
September	1st to 10th	Day	4 1 3 9% 31% 53%	2280
	11th to 20th	Day	8% 2 4 15% 42% 29%	2280
	21st to end	Day	9% 2 3 16% 40% 31%	2079
October	1st to 10th	Day	11% 2 4 11% 21% 51%	3180
	11th to 20th	Day	12% 2 4 22% 34% 27%	3161
	21st to end	Day	19% 3 4 13% 39% 22%	3448
November	1st to 10th	Day	23% 5% 8% 19% 28% 18%	1850
	11th to 20th	Day	22% 4 10% 21% 28% 15%	1710
	21st to end	Day	28% 4 7% 16% 27% 18%	1710
December	1st to 10th	Day	33% 6% 8% 16% 21% 15%	1551
	11th to 20th	Day	51% 5% 8% 15% 13% 9%	1928
	21st to end	Day	41% 8% 11% 22% 13% 5%	2794
January	1st to 10th	Night	30% 8% 12% 27% 18% 4	4313
	11th to 20th	Night	40% 7% 11% 22% 12% 8%	4110
	21st to end	Night	41% 9% 10% 18% 14% 7%	4521
February	1st to 10th	Night	32% 6% 8% 18% 23% 13%	2434
	11th to 20th	Night	27% 6% 10% 18% 30% 10%	2219
	21st to end	Night	30% 7% 10% 24% 22% 8%	1884
March	1st to 10th	Night	41% 12% 11% 15% 16% 4	3646
	11th to 20th	Night	22% 7% 10% 26% 23% 12%	3490
	21st to end	Night	33% 13% 15% 20% 16% 4	3654
April	1st to 10th	Night	27% 7% 12% 22% 21% 10%	1900
	11th to 20th	Night	20% 5% 14% 25% 25% 11%	1879
	21st to end	Night	14% 6% 11% 29% 32% 9%	1900
May	1st to 10th	Night	8% 4 8% 27% 31% 22%	3180
	11th to 20th	Night	6% 1 6% 18% 43% 25%	2820
	21st to end	Night	6% 2 5% 24% 47% 16%	2762
June	1st to 10th	Night	12% 3 9% 18% 33% 24%	1520
	11th to 20th	Night	5% 2 4 15% 38% 36%	1520
	21st to end	Night	3 1 2 8% 31% 55%	1520
July	1st to 10th	Night	2 1 3 14% 79%	2500
	11th to 20th	Night	5% 1 2 4 16% 73%	2673
	21st to end	Night	5% 1 2 5% 25% 62%	3011
August	1st to 10th	Night	7% 1 1 8% 27% 57%	2956
	11th to 20th	Night	3 1 1 4 24% 67%	3156
	21st to end	Night	4 1 2 6% 28% 60%	3498
September	1st to 10th	Night	6% 1 3 6% 23% 61%	1900
	11th to 20th	Night	7% 2 2 13% 36% 40%	1900
	21st to end	Night	7% 2 3 13% 42% 34%	2096
October	1st to 10th	Night	10% 2 3 10% 20% 55%	3800
	11th to 20th	Night	11% 2 4 16% 38% 28%	3777
	21st to end	Night	14% 2 5% 13% 41% 25%	4121
November	1st to 10th	Night	19% 4 9% 18% 28% 22%	2445
	11th to 20th	Night	21% 4 12% 18% 28% 18%	2476
	21st to end	Night	26% 6% 9% 14% 26% 19%	2470
December	1st to 10th	Night	32% 5% 7% 17% 23% 16%	2626
	11th to 20th	Night	46% 7% 9% 14% 14% 9%	3276
	21st to end	Night	40% 9% 13% 18% 15% 6%	4862

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	26% 12% 27% 21% 12%	234
	11th to 20th	Day	15% 12% 25% 27% 18% 3	370
	21st to end	Day	16% 12% 25% 27% 16% 4	407
February	1st to 10th	Day	20% 15% 24% 21% 15% 5%	385
	11th to 20th	Day	17% 15% 25% 27% 13% 2	455
	21st to end	Day	15% 18% 26% 29% 11% 2	382
March	1st to 10th	Day	18% 15% 28% 28% 10% 1	460
	11th to 20th	Day	18% 16% 23% 26% 15% 2	460
	21st to end	Day	16% 18% 31% 26% 9% 1	506
April	1st to 10th	Day	14% 14% 27% 27% 15% 3	460
	11th to 20th	Day	12% 16% 24% 31% 13% 5%	452
	21st to end	Day	5% 15% 26% 32% 15% 7%	460
May	1st to 10th	Day	10% 10% 30% 30% 16% 3	463
	11th to 20th	Day	6% 9% 27% 30% 19% 8%	488
	21st to end	Day	5% 11% 20% 33% 22% 9%	529
June	1st to 10th	Day	3 6% 21% 37% 22% 11%	490
	11th to 20th	Day	2 7% 22% 37% 24% 8%	490
	21st to end	Day	1 3 19% 38% 25% 14%	490
July	1st to 10th	Day	1 12% 42% 31% 15%	486
	11th to 20th	Day	2 7% 40% 35% 15%	484
	21st to end	Day	1 2 8% 41% 33% 15%	531
August	1st to 10th	Day	3 1 16% 42% 26% 11%	487
	11th to 20th	Day	1 1 12% 40% 32% 14%	477
	21st to end	Day	1 1 8% 36% 38% 16%	539
September	1st to 10th	Day	1 4 13% 36% 35% 11%	490
	11th to 20th	Day	2 5% 19% 39% 29% 7%	490
	21st to end	Day	2 5% 16% 37% 33% 7%	490
October	1st to 10th	Day	3 7% 21% 40% 25% 4	490
	11th to 20th	Day	4 7% 19% 37% 25% 7%	490
	21st to end	Day	5% 7% 22% 32% 26% 7%	539
November	1st to 10th	Day	8% 10% 18% 26% 34% 4	386
	11th to 20th	Day	6% 9% 20% 34% 25% 6%	270
	21st to end	Day	9% 10% 24% 32% 19% 6%	270
December	1st to 10th	Day	16% 10% 26% 26% 18% 4	194
	11th to 20th	Day	12% 17% 22% 28% 17% 4	180
	21st to end	Day	18% 18% 25% 22% 12% 5%	198
January	1st to 10th	Night	16% 7% 16% 30% 22% 10%	760
	11th to 20th	Night	11% 6% 14% 35% 25% 9%	760
	21st to end	Night	14% 6% 15% 36% 22% 7%	836
February	1st to 10th	Night	15% 8% 13% 33% 24% 8%	760
	11th to 20th	Night	11% 10% 15% 33% 25% 7%	744
	21st to end	Night	10% 10% 18% 39% 19% 4	628
March	1st to 10th	Night	14% 8% 18% 33% 23% 4	760
	11th to 20th	Night	9% 9% 18% 31% 26% 8%	760
	21st to end	Night	12% 9% 19% 32% 24% 4	836
April	1st to 10th	Night	8% 10% 18% 36% 24% 5%	760
	11th to 20th	Night	7% 10% 18% 31% 27% 7%	751
	21st to end	Night	4 8% 20% 32% 27% 9%	760
May	1st to 10th	Night	3 7% 19% 36% 27% 8%	760
	11th to 20th	Night	3 4 15% 34% 36% 8%	560
	21st to end	Night	2 7% 12% 33% 40% 6%	411
June	1st to 10th	Night	2 3 12% 34% 43% 6%	380
	11th to 20th	Night	3 12% 37% 39% 9%	380
	21st to end	Night	1 6% 33% 51% 11%	380
July	1st to 10th	Night	1 1 27% 60% 11%	370
	11th to 20th	Night	1 1 19% 59% 20%	471
	21st to end	Night	1 1 17% 57% 23%	624
August	1st to 10th	Night	1 3 26% 53% 16%	632
	11th to 20th	Night	1 3 26% 55% 14%	752
	21st to end	Night	1 3 20% 58% 17%	836
September	1st to 10th	Night	1 1 4 26% 52% 16%	760
	11th to 20th	Night	3 1 6% 33% 43% 14%	760
	21st to end	Night	1 1 9% 28% 46% 14%	760
October	1st to 10th	Night	4 4 8% 34% 37% 13%	760
	11th to 20th	Night	5% 2 9% 36% 36% 12%	760
	21st to end	Night	4 3 12% 32% 32% 17%	836
November	1st to 10th	Night	4 8% 11% 32% 33% 12%	780
	11th to 20th	Night	7% 3 13% 35% 32% 10%	762
	21st to end	Night	7% 5% 16% 34% 29% 10%	760
December	1st to 10th	Night	14% 5% 13% 35% 25% 7%	760
	11th to 20th	Night	15% 8% 16% 33% 24% 5%	760
	21st to end	Night	14% 12% 18% 31% 20% 5%	836

Page generated at 2024-11-08 03:44:47. Version ac07

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