Blue Bucket Inn
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Blue Bucket Inn clear sky chart from 2005-11-06 to 2024-03-08.

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	6% 7% 3 6% 6% 3 5% 5% 5% 7% 46%	78469
	Night	7% 8% 4 7% 6% 4 5% 5% 6% 7% 41%	81112
Transparency	Day	36% 7% 11% 18% 17% 10%	78173
	Night	40% 8% 13% 19% 15% 7%	80929
Seeing	Day	9% 11% 24% 30% 20% 7%	13596
	Night	8% 6% 19% 41% 23% 3	22971

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	7% 14% 7% 15% 10% 6% 7% 6% 5% 5% 19%	2539
	11th to 20th	Day	11% 19% 6% 11% 10% 5% 7% 6% 6% 6% 13%	2540
	21st to end	Day	15% 19% 10% 11% 10% 5% 4 4 3 6% 13%	2794
February	1st to 10th	Day	7% 12% 4 9% 7% 4 6% 7% 7% 8% 29%	1691
	11th to 20th	Day	5% 10% 4 10% 8% 5% 6% 6% 5% 9% 31%	1821
	21st to end	Day	4 6% 4 7% 9% 4 8% 7% 7% 11% 33%	1570
March	1st to 10th	Day	6% 10% 4 8% 8% 5% 6% 6% 7% 9% 31%	1871
	11th to 20th	Day	5% 9% 4 8% 8% 5% 6% 7% 7% 9% 33%	1844
	21st to end	Day	7% 10% 4 8% 8% 5% 7% 7% 6% 7% 31%	2376
April	1st to 10th	Day	7% 8% 4 6% 7% 4 6% 6% 7% 8% 37%	2160
	11th to 20th	Day	5% 7% 3 7% 6% 4 6% 5% 6% 7% 44%	2129
	21st to end	Day	5% 7% 3 6% 6% 3 5% 4 5% 6% 48%	2286
May	1st to 10th	Day	5% 5% 2 5% 5% 3 4 5% 6% 7% 53%	2382
	11th to 20th	Day	9% 6% 3 6% 5% 3 5% 5% 6% 9% 43%	2477
	21st to end	Day	7% 6% 4 8% 7% 4 7% 6% 7% 7% 38%	2723
June	1st to 10th	Day	7% 5% 3 6% 7% 3 5% 5% 7% 8% 44%	2520
	11th to 20th	Day	5% 4 2 4 4 3 4 4 5% 7% 57%	2520
	21st to end	Day	2 3 1 3 3 2 3 3 4 5% 69%	2520
July	1st to 10th	Day	3 2 1 2 3 2 2 3 4 6% 73%	2520
	11th to 20th	Day	1 1 1 2 2 1 2 2 3 4 81%	2520
	21st to end	Day	1 2 1 2 2 2 3 3 3 4 77%	2741
August	1st to 10th	Day	3 3 1 2 3 2 3 4 4 7% 67%	2507
	11th to 20th	Day	2 2 1 2 2 2 2 3 4 6% 76%	2200
	21st to end	Day	2 2 1 2 2 2 2 3 3 5% 75%	2376
September	1st to 10th	Day	2 2 1 3 3 2 3 2 3 6% 75%	2160
	11th to 20th	Day	4 3 1 3 4 2 4 4 4 6% 64%	2080
	21st to end	Day	5% 4 1 4 4 2 4 3 4 5% 62%	1980
October	1st to 10th	Day	8% 6% 2 4 4 3 4 3 3 5% 58%	1892
	11th to 20th	Day	5% 5% 2 4 3 3 5% 5% 5% 9% 54%	1787
	21st to end	Day	7% 7% 2 6% 5% 2 5% 5% 5% 7% 49%	1782
November	1st to 10th	Day	10% 9% 3 6% 5% 3 6% 6% 6% 8% 38%	1674
	11th to 20th	Day	7% 8% 4 8% 8% 4 6% 6% 6% 9% 33%	1710
	21st to end	Day	6% 8% 3 8% 8% 4 7% 6% 7% 8% 37%	1535
December	1st to 10th	Day	8% 12% 5% 9% 9% 4 6% 6% 6% 6% 28%	1520
	11th to 20th	Day	10% 16% 7% 11% 12% 4 6% 6% 5% 5% 19%	1928
	21st to end	Day	7% 14% 9% 15% 9% 6% 6% 5% 5% 6% 17%	2794
January	1st to 10th	Night	9% 14% 8% 14% 9% 5% 6% 6% 6% 7% 16%	4406
	11th to 20th	Night	15% 16% 5% 10% 8% 5% 7% 7% 6% 5% 15%	4420
	21st to end	Night	13% 20% 8% 14% 8% 4 5% 4 4 5% 14%	4862
February	1st to 10th	Night	8% 11% 5% 9% 6% 5% 6% 7% 6% 7% 30%	2489
	11th to 20th	Night	7% 10% 4 7% 7% 5% 5% 5% 7% 10% 32%	2247
	21st to end	Night	4 8% 5% 8% 8% 5% 6% 7% 7% 9% 31%	1884
March	1st to 10th	Night	6% 8% 4 8% 7% 5% 7% 5% 7% 9% 33%	2249
	11th to 20th	Night	6% 7% 3 5% 6% 4 8% 7% 8% 9% 36%	2113
	21st to end	Night	4 9% 3 8% 5% 4 6% 7% 6% 10% 38%	1980
April	1st to 10th	Night	7% 7% 3 6% 6% 4 6% 6% 5% 8% 42%	1800
	11th to 20th	Night	4 7% 3 7% 6% 3 5% 6% 5% 7% 47%	1779
	21st to end	Night	6% 6% 2 4 5% 2 4 5% 6% 9% 51%	1672
May	1st to 10th	Night	4 6% 2 5% 4 2 5% 5% 7% 8% 52%	1576
	11th to 20th	Night	7% 6% 3 5% 4 3 5% 4 6% 9% 48%	1416
	21st to end	Night	6% 5% 2 6% 6% 4 5% 6% 6% 8% 45%	1552
June	1st to 10th	Night	6% 5% 2 5% 5% 4 5% 6% 6% 8% 47%	1440
	11th to 20th	Night	6% 4 2 4 5% 2 4 4 4 7% 58%	1440
	21st to end	Night	2 3 2 3 3 2 3 4 5% 7% 68%	1440
July	1st to 10th	Night	3 2 1 3 3 2 3 4 5% 7% 68%	1440
	11th to 20th	Night	1 1 1 2 1 2 2 3 5% 82%	1440
	21st to end	Night	2 1 1 2 3 2 3 3 4 4 76%	1576
August	1st to 10th	Night	2 2 1 4 4 2 3 4 5% 9% 63%	1432
	11th to 20th	Night	1 1 1 2 2 2 2 3 4 5% 77%	1697
	21st to end	Night	2 3 1 2 2 1 3 2 4 5% 75%	1980
September	1st to 10th	Night	2 2 1 2 2 1 2 3 4 4 78%	1800
	11th to 20th	Night	3 2 1 2 3 3 3 3 4 6% 70%	1878
	21st to end	Night	4 3 1 3 3 2 3 3 4 6% 66%	1980
October	1st to 10th	Night	6% 4 1 3 4 2 4 4 5% 6% 61%	2065
	11th to 20th	Night	4 5% 2 3 3 3 4 4 5% 7% 60%	2171
	21st to end	Night	6% 5% 2 5% 5% 3 4 6% 6% 6% 51%	2574
November	1st to 10th	Night	9% 8% 3 6% 6% 4 5% 4 6% 8% 42%	2405
	11th to 20th	Night	8% 9% 3 6% 7% 5% 6% 6% 8% 8% 35%	2470
	21st to end	Night	6% 8% 4 7% 7% 4 6% 6% 7% 8% 38%	2641
December	1st to 10th	Night	9% 12% 5% 8% 8% 4 6% 5% 6% 7% 29%	2660
	11th to 20th	Night	9% 14% 5% 12% 10% 5% 8% 5% 6% 6% 20%	3276
	21st to end	Night	8% 13% 8% 14% 10% 6% 8% 6% 6% 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	64% 10% 13% 10% 2	2539
	11th to 20th	Day	67% 10% 12% 8% 3	2540
	21st to end	Day	72% 8% 10% 7% 2 1	2794
February	1st to 10th	Day	48% 12% 19% 15% 5%	1691
	11th to 20th	Day	47% 10% 15% 20% 7% 1	1831
	21st to end	Day	41% 12% 18% 19% 9% 1	1570
March	1st to 10th	Day	46% 11% 15% 19% 7% 2	1871
	11th to 20th	Day	45% 10% 14% 21% 10%	1844
	21st to end	Day	49% 11% 15% 17% 7% 1	2376
April	1st to 10th	Day	42% 10% 14% 21% 12% 2	2160
	11th to 20th	Day	37% 7% 14% 21% 16% 4	2132
	21st to end	Day	36% 8% 13% 25% 16% 3	2286
May	1st to 10th	Day	29% 7% 12% 29% 19% 4	2382
	11th to 20th	Day	37% 7% 11% 26% 15% 4	2480
	21st to end	Day	41% 11% 11% 21% 14% 2	2724
June	1st to 10th	Day	35% 8% 13% 24% 19% 1	2520
	11th to 20th	Day	26% 6% 10% 25% 25% 8%	2520
	21st to end	Day	18% 4 8% 19% 33% 18%	2520
July	1st to 10th	Day	14% 3 6% 17% 27% 33%	2451
	11th to 20th	Day	9% 2 5% 12% 27% 45%	2445
	21st to end	Day	12% 2 4 9% 28% 45%	2589
August	1st to 10th	Day	18% 4 6% 17% 29% 26%	2490
	11th to 20th	Day	10% 3 6% 18% 33% 30%	2200
	21st to end	Day	12% 3 6% 17% 36% 27%	2376
September	1st to 10th	Day	13% 3 4 20% 29% 31%	2160
	11th to 20th	Day	20% 5% 9% 18% 29% 19%	2080
	21st to end	Day	25% 4 8% 23% 26% 13%	1980
October	1st to 10th	Day	30% 5% 11% 21% 25% 9%	1892
	11th to 20th	Day	27% 6% 12% 28% 20% 6%	1787
	21st to end	Day	33% 8% 14% 25% 17% 2	1782
November	1st to 10th	Day	42% 8% 14% 23% 13%	1674
	11th to 20th	Day	45% 9% 19% 20% 6% 1	1710
	21st to end	Day	43% 7% 19% 19% 10% 2	1535
December	1st to 10th	Day	53% 11% 16% 16% 4 1	1520
	11th to 20th	Day	63% 10% 10% 15% 3	1928
	21st to end	Day	66% 10% 8% 11% 5%	2794
January	1st to 10th	Night	62% 12% 14% 10% 3	4406
	11th to 20th	Night	63% 12% 10% 10% 4	4420
	21st to end	Night	68% 7% 11% 10% 3	4862
February	1st to 10th	Night	49% 10% 16% 18% 6% 1	2489
	11th to 20th	Night	44% 10% 18% 18% 9% 1	2248
	21st to end	Night	43% 12% 17% 18% 9% 2	1884
March	1st to 10th	Night	44% 9% 15% 19% 10% 3	2249
	11th to 20th	Night	40% 10% 16% 27% 8% 1	2113
	21st to end	Night	39% 10% 19% 24% 7%	1980
April	1st to 10th	Night	39% 8% 16% 22% 13% 2	1800
	11th to 20th	Night	36% 7% 15% 25% 14% 3	1779
	21st to end	Night	29% 7% 17% 29% 17% 2	1672
May	1st to 10th	Night	28% 7% 12% 31% 21% 1	1576
	11th to 20th	Night	33% 7% 14% 27% 16% 3	1416
	21st to end	Night	34% 10% 18% 27% 11% 1	1552
June	1st to 10th	Night	35% 8% 17% 25% 15% 1	1440
	11th to 20th	Night	27% 6% 11% 28% 21% 7%	1440
	21st to end	Night	16% 5% 10% 24% 33% 13%	1440
July	1st to 10th	Night	16% 5% 6% 18% 29% 28%	1400
	11th to 20th	Night	8% 2 5% 17% 30% 39%	1392
	21st to end	Night	12% 3 5% 8% 31% 41%	1488
August	1st to 10th	Night	18% 4 9% 19% 25% 25%	1424
	11th to 20th	Night	10% 3 6% 18% 31% 32%	1697
	21st to end	Night	13% 3 5% 17% 34% 28%	1980
September	1st to 10th	Night	11% 3 5% 19% 30% 32%	1800
	11th to 20th	Night	17% 4 8% 19% 29% 22%	1878
	21st to end	Night	20% 5% 8% 23% 29% 15%	1980
October	1st to 10th	Night	25% 6% 11% 22% 27% 9%	2065
	11th to 20th	Night	23% 6% 12% 27% 26% 6%	2171
	21st to end	Night	29% 8% 17% 22% 21% 3	2574
November	1st to 10th	Night	39% 8% 14% 21% 17% 1	2405
	11th to 20th	Night	43% 9% 17% 22% 8%	2470
	21st to end	Night	40% 7% 18% 20% 12% 2	2641
December	1st to 10th	Night	51% 9% 15% 17% 8% 1	2660
	11th to 20th	Night	60% 9% 12% 15% 4	3276
	21st to end	Night	61% 10% 10% 10% 8%	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	17% 13% 19% 27% 18% 6%	180
	11th to 20th	Day	16% 12% 13% 31% 23% 6%	180
	21st to end	Day	11% 4 18% 39% 24% 5%	198
February	1st to 10th	Day	12% 8% 26% 32% 16% 5%	351
	11th to 20th	Day	12% 12% 29% 29% 15% 3	441
	21st to end	Day	7% 14% 28% 32% 18% 2	382
March	1st to 10th	Day	12% 12% 31% 31% 14% 1	449
	11th to 20th	Day	8% 17% 25% 30% 16% 3	420
	21st to end	Day	13% 19% 29% 27% 12% 1	462
April	1st to 10th	Day	15% 18% 24% 25% 13% 4	420
	11th to 20th	Day	8% 23% 30% 23% 11% 5%	412
	21st to end	Day	10% 18% 28% 25% 16% 3	420
May	1st to 10th	Day	9% 13% 31% 25% 16% 5%	423
	11th to 20th	Day	16% 17% 22% 22% 18% 5%	448
	21st to end	Day	8% 8% 25% 29% 20% 10%	485
June	1st to 10th	Day	8% 13% 25% 25% 17% 12%	450
	11th to 20th	Day	9% 16% 26% 25% 19% 5%	450
	21st to end	Day	3 8% 25% 31% 22% 11%	450
July	1st to 10th	Day	5% 5% 27% 37% 20% 7%	446
	11th to 20th	Day	2 7% 25% 36% 23% 8%	444
	21st to end	Day	2 5% 22% 35% 26% 10%	487
August	1st to 10th	Day	5% 5% 23% 33% 23% 11%	447
	11th to 20th	Day	3 5% 15% 31% 28% 17%	437
	21st to end	Day	3 7% 21% 32% 24% 13%	495
September	1st to 10th	Day	3 5% 23% 28% 30% 12%	450
	11th to 20th	Day	6% 9% 20% 30% 25% 11%	450
	21st to end	Day	7% 9% 18% 32% 25% 8%	450
October	1st to 10th	Day	10% 13% 21% 25% 22% 11%	450
	11th to 20th	Day	10% 9% 22% 26% 24% 8%	437
	21st to end	Day	11% 12% 20% 30% 19% 7%	297
November	1st to 10th	Day	16% 13% 19% 30% 21% 3	270
	11th to 20th	Day	11% 4 26% 31% 21% 6%	270
	21st to end	Day	12% 5% 22% 37% 20% 3	187
December	1st to 10th	Day	16% 10% 14% 33% 14% 14%	180
	11th to 20th	Day	19% 6% 20% 39% 12% 4	180
	21st to end	Day	10% 10% 19% 35% 22% 5%	198
January	1st to 10th	Night	13% 8% 21% 35% 20% 3	760
	11th to 20th	Night	14% 8% 17% 36% 21% 4	760
	21st to end	Night	12% 5% 17% 40% 22% 4	836
February	1st to 10th	Night	13% 4 26% 37% 18% 2	760
	11th to 20th	Night	10% 6% 24% 39% 19% 2	744
	21st to end	Night	9% 9% 21% 41% 19% 1	628
March	1st to 10th	Night	9% 7% 23% 41% 17% 2	750
	11th to 20th	Night	9% 7% 20% 42% 20% 2	720
	21st to end	Night	9% 10% 25% 40% 15% 1	792
April	1st to 10th	Night	10% 8% 24% 36% 19% 2	720
	11th to 20th	Night	6% 11% 26% 34% 19% 4	711
	21st to end	Night	9% 6% 25% 41% 19% 1	592
May	1st to 10th	Night	5% 9% 25% 39% 19% 2	496
	11th to 20th	Night	9% 5% 18% 36% 28% 4	354
	21st to end	Night	8% 6% 19% 38% 26% 4	389
June	1st to 10th	Night	7% 6% 19% 42% 26% 1	360
	11th to 20th	Night	7% 6% 24% 42% 19% 2	360
	21st to end	Night	3 3 15% 51% 26% 1	360
July	1st to 10th	Night	3 3 15% 51% 27% 1	350
	11th to 20th	Night	16% 60% 22% 1	348
	21st to end	Night	2 1 14% 58% 25% 1	394
August	1st to 10th	Night	3 1 9% 54% 30% 2	358
	11th to 20th	Night	1 1 8% 50% 35% 5%	629
	21st to end	Night	3 2 13% 45% 34% 3	792
September	1st to 10th	Night	2 2 10% 45% 37% 4	720
	11th to 20th	Night	3 3 13% 37% 36% 8%	720
	21st to end	Night	5% 4 13% 38% 32% 8%	720
October	1st to 10th	Night	7% 3 15% 43% 28% 5%	720
	11th to 20th	Night	7% 5% 19% 37% 27% 5%	720
	21st to end	Night	7% 6% 16% 45% 20% 5%	792
November	1st to 10th	Night	11% 6% 18% 41% 22% 1	740
	11th to 20th	Night	12% 9% 18% 40% 19% 2	760
	21st to end	Night	9% 6% 21% 38% 21% 5%	760
December	1st to 10th	Night	14% 5% 19% 38% 20% 4	760
	11th to 20th	Night	15% 6% 18% 41% 18% 2	760
	21st to end	Night	14% 8% 24% 41% 12% 1	836

Page generated at 2024-03-05 04:23:59. Version ac07

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