Buckhorn Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Buckhorn Recreation Area clear sky chart from 2005-11-06 to 2026-03-18.

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	7% 3 1 3 2 2 2 2 4 5% 68%	140219
	Night	9% 4 1 3 2 2 3 2 4 6% 62%	138715
Transparency	Day	21% 2 7% 19% 25% 25%	135100
	Night	26% 3 8% 20% 23% 21%	134824
Seeing	Day	9% 7% 17% 27% 26% 14%	16846
	Night	10% 6% 18% 37% 26% 3	26168

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	17% 7% 3 7% 4 4 4 3 6% 7% 39%	4722
	11th to 20th	Day	12% 5% 1 4 2 2 3 2 3 4 61%	5336
	21st to end	Day	14% 6% 2 5% 4 3 4 3 5% 7% 48%	5843
February	1st to 10th	Day	14% 5% 2 5% 2 3 4 3 6% 7% 50%	1890
	11th to 20th	Day	13% 7% 2 4 3 4 4 3 4 8% 48%	1877
	21st to end	Day	12% 6% 1 4 3 4 4 4 7% 7% 49%	1730
March	1st to 10th	Day	13% 8% 3 7% 4 4 4 3 4 6% 44%	4947
	11th to 20th	Day	12% 8% 2 5% 4 3 3 3 4 7% 50%	5078
	21st to end	Day	12% 6% 2 5% 4 4 4 4 6% 8% 45%	5568
April	1st to 10th	Day	9% 5% 2 6% 4 4 3 3 5% 9% 50%	2400
	11th to 20th	Day	8% 5% 2 3 3 3 3 3 5% 7% 60%	2369
	21st to end	Day	3 3 1 3 3 3 4 3 6% 8% 64%	2400
May	1st to 10th	Day	3 2 1 2 1 2 2 2 3 6% 76%	5851
	11th to 20th	Day	2 2 1 2 1 2 2 2 4 5% 79%	6184
	21st to end	Day	2 1 1 1 1 2 2 3 5% 81%	6902
June	1st to 10th	Day	4 3 1 3 3 2 2 3 4 8% 67%	2800
	11th to 20th	Day	1 1 1 2 1 2 2 2 3 6% 80%	2800
	21st to end	Day	2 1 1 1 1 1 1 2 3 2 85%	2800
July	1st to 10th	Day	1 1 1 1 1 3 91%	6319
	11th to 20th	Day	1 1 1 1 1 1 1 2 2 90%	6215
	21st to end	Day	1 1 1 1 1 2 2 4 5% 83%	6402
August	1st to 10th	Day	1 1 1 1 1 1 2 4 4 83%	5777
	11th to 20th	Day	1 1 1 2 2 93%	5667
	21st to end	Day	1 1 1 1 1 1 1 3 4 86%	5984
September	1st to 10th	Day	1 1 1 1 1 2 2 2 4 87%	2400
	11th to 20th	Day	3 2 1 2 2 2 3 2 3 5% 76%	2400
	21st to end	Day	3 1 2 1 1 2 1 3 4 82%	2113
October	1st to 10th	Day	3 1 1 1 2 2 2 2 3 4 80%	3280
	11th to 20th	Day	5% 2 1 2 2 2 2 2 4 5% 74%	3261
	21st to end	Day	6% 4 1 4 3 3 4 3 5% 7% 61%	3558
November	1st to 10th	Day	9% 3 1 3 3 2 4 4 6% 8% 56%	1952
	11th to 20th	Day	14% 4 2 4 3 3 4 4 6% 7% 50%	1814
	21st to end	Day	9% 4 1 4 3 4 3 3 4 6% 58%	1680
December	1st to 10th	Day	9% 3 1 3 2 3 3 3 6% 7% 60%	2700
	11th to 20th	Day	27% 9% 3 6% 4 4 5% 4 5% 7% 27%	3108
	21st to end	Day	27% 10% 2 4 3 4 4 3 4 6% 34%	4092
January	1st to 10th	Night	16% 8% 2 6% 4 4 4 4 5% 7% 39%	8172
	11th to 20th	Night	12% 5% 1 3 2 2 3 2 4 5% 60%	7650
	21st to end	Night	15% 8% 2 7% 4 3 3 2 4 6% 46%	8371
February	1st to 10th	Night	15% 6% 2 4 3 3 3 3 4 7% 52%	2730
	11th to 20th	Night	12% 5% 2 5% 4 3 3 4 5% 8% 49%	2629
	21st to end	Night	10% 5% 2 4 4 4 4 4 5% 6% 52%	2076
March	1st to 10th	Night	9% 7% 2 7% 5% 4 4 3 5% 7% 48%	5153
	11th to 20th	Night	11% 7% 2 5% 3 3 3 2 5% 6% 53%	5077
	21st to end	Night	10% 7% 2 6% 4 4 4 4 6% 9% 45%	5406
April	1st to 10th	Night	7% 4 1 4 3 4 5% 4 6% 8% 54%	2000
	11th to 20th	Night	7% 3 2 3 3 3 4 3 4 7% 61%	1979
	21st to end	Night	4 3 1 3 2 3 3 3 5% 7% 67%	2000
May	1st to 10th	Night	2 3 1 3 2 2 2 2 4 5% 74%	4113
	11th to 20th	Night	2 2 1 2 2 2 3 2 4 5% 74%	3711
	21st to end	Night	2 2 1 1 1 2 2 2 3 4 81%	3972
June	1st to 10th	Night	4 2 1 2 4 3 4 4 6% 8% 64%	1600
	11th to 20th	Night	2 1 1 1 2 1 2 2 3 4 80%	1600
	21st to end	Night	1 1 1 2 1 2 2 1 4 3 84%	1600
July	1st to 10th	Night	1 1 1 1 1 1 2 92%	3640
	11th to 20th	Night	1 1 1 1 1 1 1 1 2 91%	3746
	21st to end	Night	1 1 1 2 1 3 4 86%	4472
August	1st to 10th	Night	2 1 1 1 1 2 2 2 3 84%	4035
	11th to 20th	Night	1 1 1 1 1 1 1 1 2 91%	4185
	21st to end	Night	2 1 2 1 1 2 1 2 3 85%	5015
September	1st to 10th	Night	1 1 1 1 1 1 1 2 4 88%	2000
	11th to 20th	Night	3 2 1 3 1 2 2 2 4 4 78%	2000
	21st to end	Night	2 1 1 2 1 1 2 1 3 5% 81%	2282
October	1st to 10th	Night	3 2 1 1 1 2 2 2 3 3 81%	3920
	11th to 20th	Night	3 2 1 2 2 2 2 2 3 5% 76%	3897
	21st to end	Night	5% 2 1 3 2 3 3 4 6% 7% 64%	4253
November	1st to 10th	Night	9% 4 2 3 3 3 3 3 6% 8% 56%	2565
	11th to 20th	Night	11% 5% 1 4 3 3 3 4 6% 8% 51%	2804
	21st to end	Night	10% 5% 2 4 3 3 3 3 5% 7% 57%	2940
December	1st to 10th	Night	10% 3 1 3 2 2 3 3 5% 7% 61%	4700
	11th to 20th	Night	25% 11% 2 5% 4 3 3 4 6% 8% 29%	5316
	21st to end	Night	30% 8% 2 5% 3 3 3 2 4 5% 34%	7106

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	46% 4 11% 24% 11% 3	4723
	11th to 20th	Day	31% 2 5% 16% 21% 25%	5336
	21st to end	Day	38% 2 11% 19% 12% 18%	5843
February	1st to 10th	Day	34% 4 12% 21% 20% 10%	1890
	11th to 20th	Day	37% 4 10% 20% 22% 8%	1886
	21st to end	Day	33% 5% 10% 25% 19% 8%	1730
March	1st to 10th	Day	42% 4 7% 22% 21% 4	4947
	11th to 20th	Day	36% 4 9% 23% 18% 9%	5078
	21st to end	Day	37% 4 13% 25% 18% 3	5568
April	1st to 10th	Day	32% 4 13% 22% 21% 7%	2400
	11th to 20th	Day	25% 4 11% 25% 22% 13%	2372
	21st to end	Day	19% 3 13% 27% 27% 11%	2400
May	1st to 10th	Day	12% 2 6% 23% 30% 27%	5851
	11th to 20th	Day	11% 2 4 23% 36% 24%	6187
	21st to end	Day	8% 2 9% 28% 37% 16%	6904
June	1st to 10th	Day	17% 3 10% 26% 28% 15%	2800
	11th to 20th	Day	9% 2 8% 20% 33% 28%	2800
	21st to end	Day	8% 1 3 15% 33% 41%	2800
July	1st to 10th	Day	3 1 2 10% 22% 63%	6251
	11th to 20th	Day	5% 1 1 5% 17% 70%	6140
	21st to end	Day	6% 1 4 17% 30% 42%	6217
August	1st to 10th	Day	9% 2 2 10% 28% 50%	4206
	11th to 20th	Day	3 1 1 14% 41% 41%	4102
	21st to end	Day	6% 1 2 16% 36% 38%	4311
September	1st to 10th	Day	5% 1 2 11% 28% 52%	2400
	11th to 20th	Day	14% 2 5% 21% 38% 20%	2400
	21st to end	Day	10% 1 5% 19% 31% 34%	2113
October	1st to 10th	Day	11% 2 3 13% 24% 47%	3280
	11th to 20th	Day	15% 2 6% 26% 31% 19%	3261
	21st to end	Day	24% 3 6% 24% 29% 14%	3558
November	1st to 10th	Day	25% 5% 11% 28% 19% 12%	1952
	11th to 20th	Day	33% 4 13% 23% 18% 9%	1814
	21st to end	Day	28% 4 9% 22% 24% 13%	1680
December	1st to 10th	Day	25% 2 7% 21% 31% 13%	2700
	11th to 20th	Day	57% 3 11% 16% 10% 3	3108
	21st to end	Day	54% 3 11% 19% 11% 3	4092
January	1st to 10th	Night	46% 4 14% 21% 13% 2	8172
	11th to 20th	Night	29% 2 6% 15% 25% 22%	7650
	21st to end	Night	43% 2 8% 13% 17% 17%	8371
February	1st to 10th	Night	34% 3 9% 22% 22% 10%	2730
	11th to 20th	Night	34% 4 11% 21% 23% 8%	2631
	21st to end	Night	33% 4 11% 22% 22% 9%	2076
March	1st to 10th	Night	37% 3 10% 27% 19% 5%	5153
	11th to 20th	Night	32% 3 12% 23% 21% 9%	5077
	21st to end	Night	37% 4 12% 31% 13% 3	5406
April	1st to 10th	Night	27% 5% 14% 26% 20% 9%	2000
	11th to 20th	Night	23% 4 13% 27% 20% 13%	1979
	21st to end	Night	18% 5% 12% 30% 28% 8%	2000
May	1st to 10th	Night	15% 2 6% 22% 33% 22%	4110
	11th to 20th	Night	13% 2 6% 27% 30% 22%	3711
	21st to end	Night	10% 2 9% 29% 37% 14%	3972
June	1st to 10th	Night	18% 3 11% 27% 29% 11%	1600
	11th to 20th	Night	10% 2 8% 20% 33% 28%	1600
	21st to end	Night	7% 1 4 14% 33% 40%	1600
July	1st to 10th	Night	3 1 1 8% 22% 65%	3600
	11th to 20th	Night	5% 1 1 5% 18% 70%	3698
	21st to end	Night	5% 1 5% 19% 30% 39%	4345
August	1st to 10th	Night	11% 2 1 10% 28% 47%	2929
	11th to 20th	Night	3 1 1 12% 40% 43%	3023
	21st to end	Night	7% 1 1 14% 37% 39%	3608
September	1st to 10th	Night	5% 1 2 9% 27% 55%	2000
	11th to 20th	Night	13% 2 5% 20% 34% 26%	2000
	21st to end	Night	9% 2 5% 18% 29% 37%	2282
October	1st to 10th	Night	11% 2 4 11% 21% 51%	3920
	11th to 20th	Night	14% 2 6% 27% 32% 19%	3897
	21st to end	Night	20% 3 5% 26% 29% 18%	4253
November	1st to 10th	Night	26% 4 12% 27% 18% 13%	2565
	11th to 20th	Night	31% 5% 13% 23% 19% 9%	2804
	21st to end	Night	28% 3 9% 23% 23% 13%	2940
December	1st to 10th	Night	25% 3 6% 25% 26% 15%	4700
	11th to 20th	Night	55% 3 8% 17% 14% 3	5316
	21st to end	Night	55% 3 12% 16% 12% 3	7106

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	28% 13% 22% 23% 12% 2	220
	11th to 20th	Day	19% 10% 23% 28% 15% 5%	426
	21st to end	Day	20% 8% 19% 26% 17% 10%	473
February	1st to 10th	Day	18% 10% 22% 27% 16% 7%	430
	11th to 20th	Day	16% 15% 24% 25% 16% 4	442
	21st to end	Day	16% 10% 25% 30% 15% 4	446
March	1st to 10th	Day	21% 12% 30% 21% 12% 4	540
	11th to 20th	Day	19% 12% 19% 25% 18% 6%	529
	21st to end	Day	16% 15% 23% 29% 14% 3	550
April	1st to 10th	Day	13% 14% 25% 26% 16% 6%	500
	11th to 20th	Day	11% 11% 23% 28% 18% 8%	492
	21st to end	Day	5% 8% 26% 30% 22% 9%	500
May	1st to 10th	Day	5% 12% 29% 25% 20% 9%	503
	11th to 20th	Day	7% 8% 19% 28% 23% 15%	528
	21st to end	Day	5% 5% 18% 27% 30% 15%	573
June	1st to 10th	Day	4 5% 13% 29% 32% 16%	530
	11th to 20th	Day	3 7% 18% 30% 30% 12%	530
	21st to end	Day	2 2 13% 30% 34% 18%	530
July	1st to 10th	Day	2 1 9% 31% 38% 19%	526
	11th to 20th	Day	1 1 5% 23% 43% 27%	524
	21st to end	Day	1 1 4 24% 45% 25%	575
August	1st to 10th	Day	1 1 6% 24% 41% 27%	527
	11th to 20th	Day	2 1 7% 23% 37% 29%	517
	21st to end	Day	1 1 8% 19% 42% 29%	583
September	1st to 10th	Day	1 1 9% 29% 39% 21%	530
	11th to 20th	Day	4 2 10% 29% 33% 22%	530
	21st to end	Day	3 4 15% 34% 28% 17%	530
October	1st to 10th	Day	5% 7% 15% 28% 27% 18%	530
	11th to 20th	Day	7% 6% 17% 27% 25% 18%	530
	21st to end	Day	12% 7% 19% 25% 28% 9%	583
November	1st to 10th	Day	14% 7% 21% 23% 27% 9%	428
	11th to 20th	Day	15% 6% 21% 28% 20% 10%	289
	21st to end	Day	13% 5% 16% 36% 23% 6%	220
December	1st to 10th	Day	21% 10% 18% 25% 17% 9%	220
	11th to 20th	Day	25% 4 20% 25% 20% 7%	220
	21st to end	Day	26% 10% 22% 24% 15% 3	242
January	1st to 10th	Night	22% 7% 20% 30% 18% 3	840
	11th to 20th	Night	18% 7% 22% 34% 17% 2	840
	21st to end	Night	16% 7% 18% 37% 18% 3	924
February	1st to 10th	Night	17% 8% 21% 37% 15% 2	840
	11th to 20th	Night	15% 10% 25% 31% 16% 3	824
	21st to end	Night	12% 9% 27% 39% 11% 1	692
March	1st to 10th	Night	14% 9% 23% 37% 14% 2	840
	11th to 20th	Night	12% 9% 21% 34% 22% 2	828
	21st to end	Night	13% 11% 23% 37% 15% 1	880
April	1st to 10th	Night	10% 7% 27% 38% 17% 2	800
	11th to 20th	Night	9% 7% 24% 38% 20% 2	791
	21st to end	Night	5% 6% 23% 41% 22% 2	800
May	1st to 10th	Night	5% 10% 30% 33% 20% 2	613
	11th to 20th	Night	5% 6% 19% 35% 33% 2	437
	21st to end	Night	6% 8% 20% 38% 27% 1	433
June	1st to 10th	Night	5% 4 19% 42% 30% 2	400
	11th to 20th	Night	3 8% 20% 46% 22% 1	400
	21st to end	Night	2 2 16% 45% 35% 2	400
July	1st to 10th	Night	1 1 12% 46% 40% 1	390
	11th to 20th	Night	1 1 8% 46% 41% 3	429
	21st to end	Night	1 5% 38% 49% 6%	657
August	1st to 10th	Night	2 1 6% 35% 50% 6%	597
	11th to 20th	Night	1 1 8% 39% 45% 6%	649
	21st to end	Night	1 1 5% 35% 53% 6%	880
September	1st to 10th	Night	2 1 8% 40% 45% 4	800
	11th to 20th	Night	3 2 10% 36% 41% 8%	800
	21st to end	Night	3 3 16% 37% 34% 7%	800
October	1st to 10th	Night	6% 7% 16% 36% 31% 6%	800
	11th to 20th	Night	4 4 18% 36% 33% 5%	800
	21st to end	Night	9% 5% 20% 34% 26% 7%	880
November	1st to 10th	Night	10% 6% 17% 34% 29% 4	820
	11th to 20th	Night	13% 6% 18% 40% 20% 2	840
	21st to end	Night	12% 7% 20% 39% 20% 3	840
December	1st to 10th	Night	18% 6% 21% 33% 18% 4	840
	11th to 20th	Night	24% 6% 18% 30% 18% 3	840
	21st to end	Night	22% 9% 23% 30% 15% 1	924

Page generated at 2026-03-14 23:23:53. Version ac07

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