Beggars Canyon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Beggars Canyon clear sky chart from 2005-11-06 to 2024-11-25.

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	9% 8% 3 7% 4 4 4 3 5% 6% 47%	105535
	Night	11% 9% 3 7% 4 4 4 3 5% 6% 43%	102610
Transparency	Day	36% 5% 13% 23% 16% 7%	105278
	Night	41% 6% 14% 22% 12% 5%	102456
Seeing	Day	15% 17% 28% 23% 14% 3	14570
	Night	15% 11% 23% 32% 17% 2	23582

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	23% 22% 9% 13% 7% 5% 4 2 3 3 9%	2539
	11th to 20th	Day	23% 20% 5% 11% 6% 5% 4 3 4 5% 15%	2540
	21st to end	Day	31% 17% 5% 14% 7% 5% 4 3 3 4 9%	2894
February	1st to 10th	Day	18% 14% 4 8% 5% 5% 5% 5% 6% 7% 22%	1710
	11th to 20th	Day	16% 11% 4 9% 5% 5% 5% 4 8% 8% 26%	1665
	21st to end	Day	11% 13% 4 11% 6% 6% 5% 5% 6% 7% 26%	1551
March	1st to 10th	Day	9% 11% 4 8% 7% 6% 7% 5% 8% 10% 27%	3138
	11th to 20th	Day	9% 8% 3 7% 5% 4 4 3 5% 6% 45%	3490
	21st to end	Day	10% 11% 4 10% 7% 7% 6% 5% 7% 8% 26%	4006
April	1st to 10th	Day	10% 9% 3 9% 5% 6% 6% 5% 7% 8% 31%	2280
	11th to 20th	Day	9% 9% 3 8% 6% 5% 5% 5% 6% 7% 37%	2249
	21st to end	Day	6% 6% 2 6% 5% 6% 5% 5% 8% 9% 42%	2426
May	1st to 10th	Day	10% 6% 2 6% 4 4 5% 4 5% 7% 48%	4420
	11th to 20th	Day	5% 4 2 4 3 3 3 3 5% 7% 63%	4377
	21st to end	Day	7% 7% 2 7% 5% 6% 6% 5% 7% 7% 41%	4813
June	1st to 10th	Day	8% 7% 2 6% 4 5% 4 4 6% 7% 46%	2660
	11th to 20th	Day	4 4 2 6% 4 5% 4 3 6% 9% 52%	2660
	21st to end	Day	3 3 1 4 3 3 3 3 4 6% 66%	2660
July	1st to 10th	Day	1 1 1 1 1 1 2 3 4 84%	4420
	11th to 20th	Day	2 1 1 1 2 1 2 2 2 3 84%	4420
	21st to end	Day	1 1 1 2 1 2 2 2 3 4 82%	4790
August	1st to 10th	Day	2 3 1 3 2 2 2 2 4 4 75%	4316
	11th to 20th	Day	1 2 1 3 3 3 3 3 5% 7% 70%	4026
	21st to end	Day	4 4 1 5% 3 3 3 2 4 5% 67%	4195
September	1st to 10th	Day	3 2 1 2 2 2 2 2 5% 6% 73%	2280
	11th to 20th	Day	4 3 1 5% 4 4 4 4 5% 7% 59%	2280
	21st to end	Day	7% 5% 2 5% 3 4 4 3 4 6% 57%	2033
October	1st to 10th	Day	5% 5% 1 4 3 3 4 3 6% 7% 57%	3180
	11th to 20th	Day	6% 5% 3 8% 5% 5% 6% 5% 7% 8% 41%	3161
	21st to end	Day	11% 7% 4 8% 5% 5% 6% 5% 7% 10% 32%	3233
November	1st to 10th	Day	16% 12% 4 9% 5% 5% 5% 4 6% 8% 26%	1729
	11th to 20th	Day	17% 15% 5% 10% 7% 6% 5% 4 6% 7% 18%	1600
	21st to end	Day	17% 14% 3 9% 7% 6% 5% 3 6% 7% 23%	1552
December	1st to 10th	Day	16% 17% 6% 11% 7% 5% 4 2 4 5% 24%	1520
	11th to 20th	Day	22% 21% 9% 16% 6% 4 3 3 4 5% 10%	1928
	21st to end	Day	22% 20% 8% 15% 6% 5% 4 2 3 5% 11%	2794
January	1st to 10th	Night	22% 21% 6% 13% 6% 5% 4 3 5% 4 11%	4406
	11th to 20th	Night	26% 17% 6% 11% 4 4 3 2 4 5% 18%	4420
	21st to end	Night	29% 16% 5% 13% 6% 4 3 3 3 4 13%	4764
February	1st to 10th	Night	16% 15% 4 9% 5% 4 5% 3 5% 8% 27%	2470
	11th to 20th	Night	14% 11% 3 8% 6% 5% 4 3 5% 6% 34%	2402
	21st to end	Night	12% 14% 5% 9% 6% 4 4 4 6% 8% 28%	1902
March	1st to 10th	Night	10% 10% 3 10% 5% 6% 7% 5% 7% 9% 29%	3720
	11th to 20th	Night	8% 7% 2 6% 4 4 4 3 5% 7% 51%	3490
	21st to end	Night	10% 9% 4 10% 7% 6% 6% 5% 7% 8% 28%	3646
April	1st to 10th	Night	11% 9% 3 8% 5% 4 5% 5% 6% 10% 34%	1900
	11th to 20th	Night	9% 7% 2 6% 4 5% 5% 4 6% 7% 45%	1879
	21st to end	Night	7% 6% 2 7% 4 4 4 5% 10% 9% 44%	1750
May	1st to 10th	Night	10% 9% 3 6% 3 3 3 3 4 5% 51%	2540
	11th to 20th	Night	4 3 1 3 3 2 3 3 5% 7% 65%	2516
	21st to end	Night	3 6% 2 5% 3 4 5% 4 7% 11% 50%	2762
June	1st to 10th	Night	9% 6% 3 5% 5% 5% 5% 4 5% 8% 46%	1520
	11th to 20th	Night	5% 4 3 4 4 2 4 3 5% 8% 58%	1520
	21st to end	Night	3 3 1 3 3 3 4 3 4 5% 67%	1520
July	1st to 10th	Night	1 1 1 1 1 2 1 2 3 87%	2540
	11th to 20th	Night	1 2 2 2 1 1 2 3 4 83%	2540
	21st to end	Night	1 1 1 1 1 1 1 3 4 86%	2761
August	1st to 10th	Night	2 2 1 2 2 2 3 2 4 5% 75%	2614
	11th to 20th	Night	2 1 1 3 2 3 3 3 4 6% 72%	2812
	21st to end	Night	2 2 1 3 3 3 3 3 4 5% 73%	3482
September	1st to 10th	Night	2 1 1 3 1 2 3 2 3 6% 76%	1900
	11th to 20th	Night	4 4 2 4 3 4 4 4 4 5% 63%	1900
	21st to end	Night	6% 3 1 5% 3 3 4 3 5% 6% 60%	2145
October	1st to 10th	Night	5% 4 1 4 2 2 3 4 6% 8% 62%	3800
	11th to 20th	Night	7% 5% 2 6% 4 5% 6% 4 7% 8% 46%	3777
	21st to end	Night	11% 7% 3 8% 5% 6% 5% 5% 7% 8% 37%	4327
November	1st to 10th	Night	18% 8% 4 8% 5% 4 5% 4 6% 6% 32%	2565
	11th to 20th	Night	19% 12% 4 9% 6% 5% 5% 4 5% 6% 26%	2800
	21st to end	Night	14% 11% 4 9% 6% 5% 6% 4 5% 7% 29%	2722
December	1st to 10th	Night	18% 16% 4 10% 6% 4 4 3 4 5% 25%	2660
	11th to 20th	Night	23% 17% 6% 14% 7% 6% 4 3 4 5% 12%	3276
	21st to end	Night	20% 19% 7% 11% 5% 5% 4 3 4 5% 18%	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	73% 6% 10% 11%	2539
	11th to 20th	Day	72% 4 16% 7% 1	2540
	21st to end	Day	80% 5% 7% 6% 2	2894
February	1st to 10th	Day	61% 9% 17% 11% 2	1710
	11th to 20th	Day	52% 9% 18% 17% 4	1674
	21st to end	Day	51% 10% 17% 14% 8%	1551
March	1st to 10th	Day	50% 10% 12% 21% 7%	3138
	11th to 20th	Day	37% 6% 18% 33% 7%	3490
	21st to end	Day	51% 7% 16% 21% 5%	4006
April	1st to 10th	Day	44% 9% 18% 20% 8%	2280
	11th to 20th	Day	41% 7% 19% 19% 11% 3	2252
	21st to end	Day	33% 8% 20% 25% 12% 2	2426
May	1st to 10th	Day	33% 5% 12% 28% 20% 2	4420
	11th to 20th	Day	20% 3 12% 39% 22% 4	4380
	21st to end	Day	35% 7% 24% 26% 7%	4814
June	1st to 10th	Day	34% 6% 15% 30% 13% 3	2660
	11th to 20th	Day	26% 4 16% 37% 13% 3	2660
	21st to end	Day	18% 3 15% 35% 21% 8%	2660
July	1st to 10th	Day	6% 2 7% 18% 29% 38%	4351
	11th to 20th	Day	8% 2 5% 13% 27% 45%	4345
	21st to end	Day	9% 2 7% 23% 38% 22%	4639
August	1st to 10th	Day	15% 2 6% 20% 34% 23%	4300
	11th to 20th	Day	15% 2 11% 39% 24% 8%	4065
	21st to end	Day	22% 2 11% 26% 31% 7%	4194
September	1st to 10th	Day	12% 2 9% 34% 28% 14%	2280
	11th to 20th	Day	24% 4 16% 26% 22% 7%	2280
	21st to end	Day	29% 4 15% 29% 18% 5%	2033
October	1st to 10th	Day	26% 5% 12% 32% 23% 3	3180
	11th to 20th	Day	39% 5% 18% 23% 13% 1	3161
	21st to end	Day	47% 6% 12% 26% 8% 1	3233
November	1st to 10th	Day	56% 8% 14% 18% 4	1729
	11th to 20th	Day	63% 9% 13% 12% 3	1600
	21st to end	Day	60% 8% 15% 12% 5% 1	1552
December	1st to 10th	Day	64% 6% 12% 15% 4	1520
	11th to 20th	Day	78% 5% 9% 6% 1	1928
	21st to end	Day	79% 4 7% 8% 1	2794
January	1st to 10th	Night	73% 7% 9% 9% 1	4406
	11th to 20th	Night	68% 5% 16% 9% 2	4420
	21st to end	Night	77% 6% 8% 8% 1	4764
February	1st to 10th	Night	55% 10% 19% 14% 2	2470
	11th to 20th	Night	48% 9% 18% 19% 5%	2404
	21st to end	Night	49% 10% 17% 19% 5% 1	1902
March	1st to 10th	Night	47% 10% 14% 24% 5%	3720
	11th to 20th	Night	33% 5% 20% 34% 8%	3490
	21st to end	Night	48% 8% 20% 21% 3	3646
April	1st to 10th	Night	41% 9% 21% 21% 7% 1	1900
	11th to 20th	Night	36% 6% 21% 23% 11% 3	1879
	21st to end	Night	31% 9% 20% 27% 11% 2	1750
May	1st to 10th	Night	33% 4 13% 32% 18% 1	2540
	11th to 20th	Night	17% 4 15% 41% 20% 3	2516
	21st to end	Night	25% 6% 36% 27% 5%	2762
June	1st to 10th	Night	35% 6% 14% 33% 9% 2	1520
	11th to 20th	Night	23% 4 21% 38% 14% 1	1520
	21st to end	Night	18% 3 13% 38% 22% 6%	1520
July	1st to 10th	Night	6% 2 8% 17% 32% 35%	2500
	11th to 20th	Night	9% 2 6% 16% 28% 39%	2492
	21st to end	Night	6% 1 8% 22% 40% 23%	2674
August	1st to 10th	Night	14% 2 5% 22% 35% 22%	2606
	11th to 20th	Night	15% 2 13% 41% 23% 6%	2839
	21st to end	Night	16% 3 14% 29% 31% 8%	3482
September	1st to 10th	Night	11% 3 13% 31% 28% 14%	1900
	11th to 20th	Night	22% 5% 14% 30% 18% 11%	1900
	21st to end	Night	23% 4 15% 30% 22% 6%	2145
October	1st to 10th	Night	22% 3 12% 37% 25% 1	3800
	11th to 20th	Night	35% 5% 20% 26% 13% 1	3777
	21st to end	Night	44% 7% 12% 26% 11% 1	4327
November	1st to 10th	Night	50% 8% 15% 20% 7%	2565
	11th to 20th	Night	58% 9% 14% 16% 4	2800
	21st to end	Night	53% 9% 15% 16% 5% 1	2722
December	1st to 10th	Night	63% 7% 12% 14% 3	2660
	11th to 20th	Night	74% 8% 10% 6% 1	3276
	21st to end	Night	71% 6% 9% 12% 2	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	32% 21% 16% 21% 11% 1	180
	11th to 20th	Day	32% 13% 20% 24% 8% 3	180
	21st to end	Day	27% 10% 26% 25% 12% 1	259
February	1st to 10th	Day	27% 17% 24% 22% 9% 1	370
	11th to 20th	Day	27% 18% 27% 20% 6% 1	365
	21st to end	Day	20% 23% 26% 21% 9% 1	373
March	1st to 10th	Day	21% 22% 29% 20% 8% 1	460
	11th to 20th	Day	20% 19% 26% 24% 10% 2	460
	21st to end	Day	23% 23% 27% 20% 7% 1	506
April	1st to 10th	Day	24% 24% 27% 15% 8% 2	460
	11th to 20th	Day	19% 29% 27% 15% 7% 3	452
	21st to end	Day	17% 25% 31% 18% 7% 2	460
May	1st to 10th	Day	16% 22% 29% 21% 10% 3	463
	11th to 20th	Day	18% 16% 31% 17% 14% 3	488
	21st to end	Day	14% 16% 31% 24% 12% 3	529
June	1st to 10th	Day	15% 20% 28% 21% 14% 3	490
	11th to 20th	Day	15% 26% 32% 16% 10% 1	490
	21st to end	Day	7% 16% 32% 27% 15% 3	490
July	1st to 10th	Day	5% 11% 40% 28% 13% 3	486
	11th to 20th	Day	4 16% 32% 28% 17% 3	484
	21st to end	Day	3 12% 34% 27% 20% 5%	531
August	1st to 10th	Day	5% 8% 31% 26% 21% 8%	487
	11th to 20th	Day	3 9% 29% 28% 24% 8%	477
	21st to end	Day	8% 14% 27% 26% 19% 7%	539
September	1st to 10th	Day	4 11% 29% 27% 23% 6%	490
	11th to 20th	Day	9% 13% 28% 24% 23% 2	490
	21st to end	Day	12% 14% 25% 28% 17% 4	490
October	1st to 10th	Day	12% 16% 27% 22% 19% 5%	490
	11th to 20th	Day	17% 14% 21% 24% 17% 5%	490
	21st to end	Day	19% 19% 23% 22% 13% 4	412
November	1st to 10th	Day	24% 15% 20% 27% 12% 2	283
	11th to 20th	Day	28% 18% 20% 21% 10% 3	200
	21st to end	Day	23% 11% 21% 28% 15% 2	188
December	1st to 10th	Day	26% 12% 20% 21% 16% 6%	180
	11th to 20th	Day	32% 13% 22% 25% 7% 1	180
	21st to end	Day	25% 15% 22% 24% 14% 1	198
January	1st to 10th	Night	28% 12% 21% 27% 11% 1	760
	11th to 20th	Night	28% 8% 19% 30% 14% 2	760
	21st to end	Night	24% 9% 17% 32% 17% 2	836
February	1st to 10th	Night	25% 11% 21% 29% 13% 1	760
	11th to 20th	Night	20% 13% 23% 28% 15% 1	744
	21st to end	Night	21% 16% 22% 30% 11%	628
March	1st to 10th	Night	19% 13% 22% 31% 15% 1	760
	11th to 20th	Night	15% 13% 22% 34% 14%	760
	21st to end	Night	17% 15% 29% 28% 10% 2	836
April	1st to 10th	Night	17% 15% 25% 29% 13% 1	760
	11th to 20th	Night	15% 18% 26% 24% 14% 3	751
	21st to end	Night	10% 17% 28% 31% 14% 1	610
May	1st to 10th	Night	10% 14% 27% 33% 15% 1	380
	11th to 20th	Night	8% 9% 24% 36% 21% 2	374
	21st to end	Night	7% 8% 29% 37% 16% 3	411
June	1st to 10th	Night	12% 11% 29% 31% 16% 1	380
	11th to 20th	Night	10% 14% 33% 31% 12% 1	380
	21st to end	Night	4 13% 26% 35% 21% 1	380
July	1st to 10th	Night	3 8% 24% 42% 22% 1	370
	11th to 20th	Night	1 5% 33% 43% 16% 1	368
	21st to end	Night	3 6% 23% 41% 26% 1	416
August	1st to 10th	Night	2 5% 17% 47% 25% 3	424
	11th to 20th	Night	3 4 15% 34% 36% 8%	564
	21st to end	Night	3 11% 25% 35% 23% 4	820
September	1st to 10th	Night	3 6% 23% 34% 30% 4	760
	11th to 20th	Night	6% 6% 23% 30% 30% 6%	760
	21st to end	Night	8% 8% 19% 34% 29% 3	760
October	1st to 10th	Night	11% 7% 20% 38% 21% 3	760
	11th to 20th	Night	14% 9% 19% 33% 23% 3	760
	21st to end	Night	17% 10% 21% 31% 17% 3	836
November	1st to 10th	Night	19% 11% 21% 35% 13% 1	780
	11th to 20th	Night	26% 10% 22% 28% 13% 1	800
	21st to end	Night	17% 8% 24% 33% 15% 3	778
December	1st to 10th	Night	23% 9% 20% 31% 16% 2	760
	11th to 20th	Night	28% 8% 19% 32% 13% 1	760
	21st to end	Night	28% 14% 20% 28% 9% 1	836

Page generated at 2024-11-22 05:02:25. Version ac07

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