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 2024-12-06.

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% 67%	105507
	Night	9% 4 1 3 2 2 3 2 4 6% 62%	102951
Transparency	Day	21% 3 7% 19% 24% 26%	105262
	Night	25% 3 8% 19% 23% 21%	102785
Seeing	Day	9% 7% 17% 27% 27% 14%	15248
	Night	10% 6% 18% 36% 27% 3	24478

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% 9% 3 7% 4 4 3 2 4 7% 39%	2539
	11th to 20th	Day	23% 10% 3 7% 4 3 4 2 3 5% 37%	2856
	21st to end	Day	22% 10% 3 7% 4 3 4 3 4 6% 34%	3146
February	1st to 10th	Day	13% 5% 2 5% 3 3 4 3 5% 7% 50%	1710
	11th to 20th	Day	12% 7% 2 4 3 4 4 3 4 8% 50%	1693
	21st to end	Day	12% 6% 1 3 2 4 4 4 7% 7% 51%	1570
March	1st to 10th	Day	16% 9% 3 7% 4 5% 5% 4 5% 6% 37%	3369
	11th to 20th	Day	9% 5% 1 4 3 3 3 2 4 8% 58%	3490
	21st to end	Day	13% 7% 3 7% 4 4 4 4 5% 7% 42%	3881
April	1st to 10th	Day	10% 5% 2 6% 4 4 3 3 5% 9% 50%	2280
	11th to 20th	Day	8% 5% 2 3 3 3 3 3 5% 7% 58%	2249
	21st to end	Day	3 3 1 3 3 3 3 3 6% 8% 64%	2280
May	1st to 10th	Day	4 2 1 3 2 2 2 2 3 5% 74%	4094
	11th to 20th	Day	2 2 1 2 1 2 2 1 3 5% 79%	4310
	21st to end	Day	3 1 1 2 1 2 2 2 4 6% 77%	4813
June	1st to 10th	Day	4 3 1 3 3 2 2 3 4 8% 66%	2660
	11th to 20th	Day	1 1 1 2 1 2 2 2 3 6% 80%	2660
	21st to end	Day	2 1 1 1 1 1 1 2 3 3 84%	2660
July	1st to 10th	Day	1 1 1 1 2 93%	4420
	11th to 20th	Day	1 1 2 1 1 1 1 2 3 86%	4341
	21st to end	Day	1 1 1 1 1 1 1 2 2 91%	4455
August	1st to 10th	Day	2 1 1 1 1 2 2 2 4 5% 79%	4091
	11th to 20th	Day	1 1 1 1 1 2 2 92%	3936
	21st to end	Day	1 1 1 1 1 1 1 2 3 88%	4180
September	1st to 10th	Day	1 1 1 1 1 1 2 3 89%	2280
	11th to 20th	Day	2 2 1 2 2 2 3 2 3 5% 76%	2280
	21st to end	Day	2 1 2 1 1 1 1 3 4 83%	2008
October	1st to 10th	Day	3 1 1 1 2 2 2 2 3 4 80%	3180
	11th to 20th	Day	4 2 1 2 2 2 2 2 4 5% 74%	3161
	21st to end	Day	6% 4 1 4 3 3 4 3 6% 7% 61%	3448
November	1st to 10th	Day	9% 3 1 3 3 2 4 4 6% 8% 56%	1857
	11th to 20th	Day	13% 4 2 4 3 3 4 3 6% 8% 51%	1728
	21st to end	Day	10% 4 1 5% 3 4 3 3 4 7% 56%	1600
December	1st to 10th	Day	16% 5% 2 4 2 3 3 3 4 6% 52%	1560
	11th to 20th	Day	27% 8% 3 6% 4 3 4 3 4 6% 32%	1928
	21st to end	Day	24% 7% 2 4 3 4 4 3 4 7% 37%	2794
January	1st to 10th	Night	14% 8% 3 6% 4 3 4 3 6% 8% 41%	4406
	11th to 20th	Night	21% 10% 2 5% 3 3 3 3 5% 6% 37%	4110
	21st to end	Night	23% 10% 3 9% 4 4 4 3 4 6% 31%	4521
February	1st to 10th	Night	14% 6% 1 5% 3 3 4 3 4 7% 52%	2470
	11th to 20th	Night	11% 5% 2 5% 4 3 4 4 5% 8% 50%	2373
	21st to end	Night	9% 5% 2 4 4 4 4 4 5% 6% 54%	1884
March	1st to 10th	Night	11% 8% 2 6% 4 3 4 3 5% 7% 46%	3504
	11th to 20th	Night	11% 6% 1 4 2 2 3 2 4 6% 59%	3490
	21st to end	Night	11% 6% 2 6% 4 4 4 4 6% 9% 45%	3771
April	1st to 10th	Night	7% 4 1 4 3 4 5% 4 6% 8% 54%	1900
	11th to 20th	Night	7% 3 2 3 3 3 4 3 4 7% 61%	1879
	21st to end	Night	3 3 1 3 2 3 3 3 5% 7% 68%	1900
May	1st to 10th	Night	3 3 1 3 3 2 3 2 4 5% 71%	2873
	11th to 20th	Night	2 1 1 2 2 2 2 4 5% 78%	2583
	21st to end	Night	2 3 1 2 1 2 2 2 3 4 76%	2762
June	1st to 10th	Night	4 2 1 2 4 3 4 4 6% 8% 63%	1520
	11th to 20th	Night	2 1 1 1 2 1 2 2 3 4 79%	1520
	21st to end	Night	1 1 1 2 1 2 2 1 4 3 84%	1520
July	1st to 10th	Night	1 1 1 1 1 2 93%	2540
	11th to 20th	Night	1 1 1 1 1 1 1 1 1 3 87%	2618
	21st to end	Night	1 1 1 2 3 90%	3109
August	1st to 10th	Night	3 2 1 2 1 1 3 2 3 3 80%	2848
	11th to 20th	Night	1 1 1 1 2 2 93%	2903
	21st to end	Night	2 1 1 1 1 1 1 1 2 88%	3498
September	1st to 10th	Night	1 1 1 1 1 1 1 4 89%	1900
	11th to 20th	Night	3 1 1 3 1 1 2 1 4 4 78%	1900
	21st to end	Night	2 1 1 2 1 1 2 1 3 5% 81%	2167
October	1st to 10th	Night	2 2 1 1 1 2 2 2 3 3 82%	3800
	11th to 20th	Night	3 2 1 2 2 2 2 2 3 5% 76%	3777
	21st to end	Night	5% 2 1 2 2 3 3 4 6% 8% 64%	4121
November	1st to 10th	Night	9% 4 2 3 3 3 3 3 6% 8% 56%	2440
	11th to 20th	Night	10% 5% 1 4 3 3 3 4 6% 8% 52%	2670
	21st to end	Night	11% 5% 2 4 3 3 3 3 4 7% 56%	2800
December	1st to 10th	Night	17% 5% 2 3 3 3 3 3 5% 8% 50%	2736
	11th to 20th	Night	27% 9% 2 4 3 3 2 3 5% 8% 35%	3276
	21st to end	Night	23% 7% 2 5% 4 4 4 3 5% 6% 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	47% 3 12% 28% 7% 3	2539
	11th to 20th	Day	54% 3 9% 16% 10% 8%	2856
	21st to end	Day	53% 3 12% 15% 12% 5%	3146
February	1st to 10th	Day	34% 4 12% 21% 20% 9%	1710
	11th to 20th	Day	34% 5% 9% 20% 23% 9%	1702
	21st to end	Day	31% 5% 10% 27% 19% 8%	1570
March	1st to 10th	Day	47% 5% 10% 17% 17% 5%	3369
	11th to 20th	Day	28% 3 9% 24% 23% 12%	3490
	21st to end	Day	41% 4 13% 22% 15% 4	3881
April	1st to 10th	Day	33% 4 13% 22% 21% 7%	2280
	11th to 20th	Day	26% 4 11% 25% 22% 12%	2252
	21st to end	Day	18% 3 14% 27% 27% 11%	2280
May	1st to 10th	Day	14% 3 9% 23% 27% 24%	4094
	11th to 20th	Day	10% 2 6% 21% 32% 28%	4313
	21st to end	Day	11% 3 12% 30% 28% 16%	4814
June	1st to 10th	Day	18% 3 11% 26% 28% 14%	2660
	11th to 20th	Day	9% 2 8% 20% 33% 28%	2660
	21st to end	Day	8% 1 3 15% 32% 41%	2660
July	1st to 10th	Day	3 1 2 7% 17% 70%	4351
	11th to 20th	Day	7% 2 2 7% 18% 64%	4266
	21st to end	Day	4 1 1 7% 28% 59%	4315
August	1st to 10th	Day	9% 2 2 10% 27% 51%	4076
	11th to 20th	Day	3 1 1 14% 41% 41%	3975
	21st to end	Day	6% 1 3 16% 36% 38%	4179
September	1st to 10th	Day	4 1 2 10% 28% 55%	2280
	11th to 20th	Day	13% 2 5% 21% 39% 19%	2280
	21st to end	Day	9% 1 5% 19% 31% 34%	2008
October	1st to 10th	Day	11% 2 3 13% 24% 47%	3180
	11th to 20th	Day	15% 2 6% 26% 32% 19%	3161
	21st to end	Day	23% 3 6% 23% 29% 15%	3448
November	1st to 10th	Day	25% 5% 11% 27% 20% 13%	1857
	11th to 20th	Day	31% 4 13% 23% 19% 10%	1728
	21st to end	Day	29% 5% 9% 21% 23% 14%	1600
December	1st to 10th	Day	35% 3 9% 21% 21% 11%	1560
	11th to 20th	Day	55% 3 9% 14% 15% 4	1928
	21st to end	Day	49% 3 14% 19% 12% 4	2794
January	1st to 10th	Night	43% 3 18% 24% 9% 3	4406
	11th to 20th	Night	51% 4 12% 13% 13% 8%	4110
	21st to end	Night	57% 3 10% 11% 13% 6%	4521
February	1st to 10th	Night	34% 3 9% 23% 21% 10%	2470
	11th to 20th	Night	32% 4 10% 21% 24% 9%	2375
	21st to end	Night	31% 4 11% 23% 22% 8%	1884
March	1st to 10th	Night	38% 4 13% 25% 18% 4	3504
	11th to 20th	Night	28% 3 8% 24% 24% 12%	3490
	21st to end	Night	36% 5% 13% 29% 14% 3	3771
April	1st to 10th	Night	28% 5% 14% 25% 20% 9%	1900
	11th to 20th	Night	24% 4 13% 27% 20% 12%	1879
	21st to end	Night	16% 5% 12% 30% 28% 8%	1900
May	1st to 10th	Night	17% 3 9% 21% 33% 18%	2873
	11th to 20th	Night	10% 2 8% 22% 31% 27%	2583
	21st to end	Night	13% 3 12% 33% 23% 16%	2762
June	1st to 10th	Night	19% 3 12% 27% 28% 11%	1520
	11th to 20th	Night	10% 2 8% 19% 33% 28%	1520
	21st to end	Night	8% 1 4 14% 32% 41%	1520
July	1st to 10th	Night	3 1 1 8% 17% 71%	2500
	11th to 20th	Night	7% 1 2 7% 17% 66%	2570
	21st to end	Night	3 2 2 8% 30% 56%	3011
August	1st to 10th	Night	11% 2 1 9% 28% 48%	2839
	11th to 20th	Night	3 1 1 12% 40% 43%	2930
	21st to end	Night	7% 1 1 15% 37% 39%	3498
September	1st to 10th	Night	5% 1 2 7% 27% 57%	1900
	11th to 20th	Night	12% 2 5% 20% 34% 27%	1900
	21st to end	Night	8% 2 5% 18% 30% 37%	2167
October	1st to 10th	Night	11% 2 4 11% 21% 52%	3800
	11th to 20th	Night	14% 2 7% 27% 32% 19%	3777
	21st to end	Night	19% 3 5% 26% 29% 18%	4121
November	1st to 10th	Night	26% 4 12% 26% 19% 13%	2440
	11th to 20th	Night	29% 5% 14% 23% 20% 10%	2670
	21st to end	Night	29% 3 8% 22% 23% 13%	2800
December	1st to 10th	Night	35% 4 9% 20% 21% 11%	2736
	11th to 20th	Night	50% 4 9% 16% 19% 4	3276
	21st to end	Night	49% 3 12% 18% 14% 4	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	29% 13% 19% 22% 13% 3	180
	11th to 20th	Day	22% 10% 22% 27% 14% 5%	366
	21st to end	Day	20% 8% 20% 25% 16% 10%	407
February	1st to 10th	Day	16% 11% 21% 28% 16% 8%	370
	11th to 20th	Day	15% 15% 22% 25% 17% 4	378
	21st to end	Day	15% 10% 25% 30% 16% 4	382
March	1st to 10th	Day	23% 13% 29% 20% 11% 4	460
	11th to 20th	Day	19% 12% 20% 24% 18% 7%	460
	21st to end	Day	15% 15% 24% 29% 13% 3	506
April	1st to 10th	Day	14% 13% 24% 27% 16% 6%	460
	11th to 20th	Day	12% 12% 22% 27% 18% 9%	452
	21st to end	Day	5% 8% 25% 30% 22% 10%	460
May	1st to 10th	Day	6% 12% 29% 25% 20% 8%	463
	11th to 20th	Day	7% 7% 18% 27% 24% 17%	488
	21st to end	Day	6% 6% 18% 26% 29% 15%	529
June	1st to 10th	Day	4 5% 14% 30% 30% 17%	490
	11th to 20th	Day	3 7% 18% 29% 30% 12%	490
	21st to end	Day	2 2 12% 31% 34% 18%	490
July	1st to 10th	Day	2 1 8% 30% 40% 20%	486
	11th to 20th	Day	1 1 5% 24% 43% 27%	484
	21st to end	Day	1 1 3 24% 46% 25%	531
August	1st to 10th	Day	1 1 7% 23% 41% 27%	487
	11th to 20th	Day	2 1 7% 24% 36% 29%	477
	21st to end	Day	1 1 8% 19% 41% 29%	539
September	1st to 10th	Day	1 1 8% 29% 40% 21%	490
	11th to 20th	Day	3 2 11% 30% 33% 21%	490
	21st to end	Day	2 4 15% 34% 28% 18%	490
October	1st to 10th	Day	5% 7% 14% 28% 27% 19%	490
	11th to 20th	Day	7% 6% 17% 27% 26% 19%	490
	21st to end	Day	12% 7% 19% 26% 28% 9%	539
November	1st to 10th	Day	13% 8% 21% 23% 26% 10%	393
	11th to 20th	Day	14% 5% 21% 28% 21% 11%	263
	21st to end	Day	14% 6% 17% 37% 23% 5%	200
December	1st to 10th	Day	24% 10% 18% 24% 15% 8%	190
	11th to 20th	Day	23% 4 23% 23% 21% 6%	180
	21st to end	Day	22% 8% 23% 27% 17% 4	198
January	1st to 10th	Night	21% 7% 19% 30% 19% 3	760
	11th to 20th	Night	18% 8% 23% 34% 15% 2	760
	21st to end	Night	17% 6% 19% 36% 18% 4	836
February	1st to 10th	Night	16% 9% 21% 37% 15% 2	760
	11th to 20th	Night	14% 10% 25% 31% 18% 3	744
	21st to end	Night	12% 10% 27% 38% 12% 1	628
March	1st to 10th	Night	16% 9% 23% 36% 14% 3	760
	11th to 20th	Night	12% 9% 21% 33% 23% 2	760
	21st to end	Night	13% 11% 24% 37% 15% 1	836
April	1st to 10th	Night	10% 7% 27% 38% 17% 2	760
	11th to 20th	Night	9% 7% 24% 38% 20% 2	751
	21st to end	Night	4 6% 23% 41% 22% 3	760
May	1st to 10th	Night	5% 10% 31% 33% 20% 2	583
	11th to 20th	Night	4 6% 19% 35% 34% 2	415
	21st to end	Night	6% 8% 20% 37% 27% 1	411
June	1st to 10th	Night	5% 4 19% 41% 30% 2	380
	11th to 20th	Night	3 8% 20% 46% 22% 1	380
	21st to end	Night	1 1 16% 45% 35% 2	380
July	1st to 10th	Night	1 1 11% 46% 41% 1	370
	11th to 20th	Night	1 1 8% 45% 41% 3	407
	21st to end	Night	1 4 38% 50% 6%	624
August	1st to 10th	Night	2 1 6% 35% 49% 7%	567
	11th to 20th	Night	1 1 8% 39% 45% 6%	616
	21st to end	Night	1 1 5% 34% 54% 6%	836
September	1st to 10th	Night	2 1 7% 40% 46% 4	760
	11th to 20th	Night	3 2 10% 35% 42% 8%	760
	21st to end	Night	3 3 16% 36% 35% 7%	760
October	1st to 10th	Night	5% 7% 15% 36% 31% 6%	760
	11th to 20th	Night	4 4 17% 37% 33% 5%	760
	21st to end	Night	8% 5% 20% 33% 26% 7%	836
November	1st to 10th	Night	10% 6% 17% 34% 29% 4	780
	11th to 20th	Night	12% 6% 18% 41% 21% 2	800
	21st to end	Night	12% 7% 21% 38% 19% 3	800
December	1st to 10th	Night	18% 7% 20% 34% 18% 4	782
	11th to 20th	Night	23% 6% 20% 31% 17% 3	760
	21st to end	Night	19% 9% 23% 32% 16% 1	836

Page generated at 2024-12-03 03:45:12. Version ac07

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