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 2024-11-02.

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	5% 7% 3 7% 5% 4 4 4 5% 7% 51%	101384
	Night	6% 8% 3 8% 5% 5% 5% 4 6% 7% 44%	97749
Transparency	Day	32% 7% 10% 19% 18% 15%	101128
	Night	36% 8% 12% 18% 16% 9%	97594
Seeing	Day	8% 11% 24% 29% 20% 8%	14538
	Night	8% 6% 19% 41% 23% 3	23716

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% 15% 7% 16% 8% 7% 6% 4 5% 5% 19%	2539
	11th to 20th	Day	11% 19% 6% 13% 9% 7% 7% 5% 5% 6% 13%	2540
	21st to end	Day	15% 20% 9% 13% 8% 6% 4 3 3 5% 13%	2794
February	1st to 10th	Day	6% 12% 5% 10% 7% 5% 6% 5% 8% 8% 29%	1691
	11th to 20th	Day	5% 11% 3 12% 7% 6% 6% 5% 6% 9% 30%	1821
	21st to end	Day	4 7% 3 8% 8% 6% 8% 5% 7% 10% 32%	1570
March	1st to 10th	Day	4 12% 4 10% 6% 7% 7% 5% 8% 11% 26%	3138
	11th to 20th	Day	3 6% 2 6% 5% 4 5% 4 6% 10% 49%	3263
	21st to end	Day	5% 9% 4 10% 8% 7% 8% 6% 7% 9% 29%	4165
April	1st to 10th	Day	6% 9% 3 7% 6% 6% 5% 5% 6% 8% 38%	2280
	11th to 20th	Day	5% 8% 2 7% 6% 6% 5% 4 6% 8% 44%	2249
	21st to end	Day	5% 8% 3 7% 5% 5% 4 4 5% 7% 47%	2414
May	1st to 10th	Day	8% 7% 3 7% 4 4 5% 3 5% 6% 48%	4191
	11th to 20th	Day	5% 4 2 4 3 3 4 3 4 7% 62%	4377
	21st to end	Day	4 5% 3 6% 5% 5% 5% 5% 7% 7% 49%	4813
June	1st to 10th	Day	7% 6% 2 7% 6% 4 4 4 7% 8% 44%	2660
	11th to 20th	Day	5% 4 2 5% 4 5% 4 3 5% 7% 57%	2660
	21st to end	Day	2 3 1 4 3 3 3 2 4 5% 69%	2660
July	1st to 10th	Day	2 1 2 2 2 1 2 3 4 82%	4420
	11th to 20th	Day	2 2 1 2 2 2 2 2 3 4 79%	4420
	21st to end	Day	1 1 1 2 1 3 2 2 3 5% 78%	4790
August	1st to 10th	Day	4 3 1 3 3 3 4 3 5% 7% 65%	4400
	11th to 20th	Day	1 1 1 2 2 2 3 2 4 6% 77%	3850
	21st to end	Day	2 2 1 3 2 2 2 2 3 5% 76%	4180
September	1st to 10th	Day	1 2 1 3 2 3 2 2 3 6% 75%	2280
	11th to 20th	Day	4 3 1 4 4 3 4 3 4 6% 63%	2195
	21st to end	Day	5% 4 1 5% 3 3 3 2 4 5% 64%	2090
October	1st to 10th	Day	7% 5% 1 5% 4 4 3 3 4 5% 59%	1997
	11th to 20th	Day	5% 6% 2 5% 3 5% 4 4 5% 8% 54%	1886
	21st to end	Day	7% 7% 2 7% 4 4 5% 4 5% 7% 49%	1881
November	1st to 10th	Day	10% 10% 3 7% 5% 5% 6% 4 6% 8% 38%	1683
	11th to 20th	Day	7% 9% 3 10% 7% 6% 6% 5% 6% 8% 33%	1710
	21st to end	Day	6% 9% 3 9% 7% 5% 6% 4 7% 8% 36%	1535
December	1st to 10th	Day	8% 14% 4 10% 8% 6% 6% 5% 6% 6% 28%	1520
	11th to 20th	Day	10% 16% 6% 12% 10% 5% 6% 4 5% 5% 19%	1928
	21st to end	Day	7% 15% 9% 17% 8% 7% 6% 4 5% 6% 17%	2794
January	1st to 10th	Night	8% 15% 7% 16% 8% 6% 6% 5% 6% 7% 16%	4406
	11th to 20th	Night	15% 17% 5% 12% 7% 6% 7% 6% 6% 5% 15%	4420
	21st to end	Night	13% 21% 8% 16% 7% 5% 5% 3 4 5% 14%	4862
February	1st to 10th	Night	8% 12% 5% 10% 6% 6% 6% 5% 6% 7% 30%	2489
	11th to 20th	Night	7% 11% 4 9% 6% 6% 5% 4 7% 10% 32%	2247
	21st to end	Night	4 9% 5% 9% 8% 6% 6% 6% 7% 9% 31%	1884
March	1st to 10th	Night	4 13% 3 11% 10% 10% 7% 5% 7% 8% 22%	3736
	11th to 20th	Night	4 7% 2 5% 4 4 5% 5% 10% 9% 45%	3714
	21st to end	Night	4 9% 3 9% 6% 6% 7% 5% 8% 11% 32%	3488
April	1st to 10th	Night	7% 8% 3 7% 5% 5% 5% 4 6% 7% 43%	1900
	11th to 20th	Night	4 8% 3 7% 5% 4 4 5% 5% 6% 48%	1879
	21st to end	Night	6% 6% 2 5% 4 4 4 4 7% 9% 51%	1764
May	1st to 10th	Night	7% 9% 2 6% 4 4 4 4 6% 7% 48%	2774
	11th to 20th	Night	4 4 1 4 3 3 3 2 4 7% 65%	2516
	21st to end	Night	6% 6% 2 6% 5% 4 4 4 6% 6% 51%	2762
June	1st to 10th	Night	6% 6% 2 6% 4 5% 5% 5% 6% 8% 47%	1520
	11th to 20th	Night	5% 4 2 4 4 3 4 3 4 7% 58%	1520
	21st to end	Night	2 3 2 3 3 2 3 3 5% 7% 68%	1520
July	1st to 10th	Night	2 1 2 2 1 2 2 3 4 81%	2540
	11th to 20th	Night	1 1 2 2 2 2 3 4 5% 78%	2540
	21st to end	Night	3 2 1 3 3 3 2 2 4 4 73%	2761
August	1st to 10th	Night	2 3 1 5% 3 4 5% 3 6% 8% 60%	2529
	11th to 20th	Night	1 1 1 3 2 2 2 3 4 6% 75%	2991
	21st to end	Night	1 3 1 3 2 2 3 2 4 4 75%	3498
September	1st to 10th	Night	2 2 1 2 2 2 2 2 4 5% 78%	1900
	11th to 20th	Night	3 3 1 3 3 3 3 2 5% 6% 68%	1983
	21st to end	Night	4 3 1 4 3 3 3 3 4 6% 67%	2090
October	1st to 10th	Night	6% 4 1 4 3 3 4 3 5% 5% 62%	2180
	11th to 20th	Night	4 5% 2 3 3 4 4 3 5% 7% 60%	2292
	21st to end	Night	6% 5% 2 6% 4 5% 5% 4 7% 7% 50%	2717
November	1st to 10th	Night	9% 8% 3 7% 5% 4 5% 4 6% 8% 41%	2418
	11th to 20th	Night	7% 9% 3 8% 6% 6% 5% 5% 8% 8% 35%	2470
	21st to end	Night	6% 9% 3 8% 5% 5% 6% 6% 7% 8% 38%	2641
December	1st to 10th	Night	9% 13% 5% 10% 7% 5% 5% 4 7% 7% 29%	2660
	11th to 20th	Night	9% 14% 5% 14% 8% 7% 7% 4 6% 6% 20%	3276
	21st to end	Night	8% 14% 7% 15% 8% 8% 8% 5% 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	43% 14% 15% 17% 9% 1	3138
	11th to 20th	Day	28% 8% 15% 39% 10%	3263
	21st to end	Day	44% 14% 17% 18% 7%	4165
April	1st to 10th	Day	41% 9% 15% 21% 11% 2	2280
	11th to 20th	Day	36% 8% 15% 22% 17% 4	2252
	21st to end	Day	35% 8% 13% 25% 16% 3	2414
May	1st to 10th	Day	32% 8% 11% 26% 20% 4	4191
	11th to 20th	Day	21% 5% 8% 27% 29% 10%	4380
	21st to end	Day	29% 10% 13% 28% 18% 2	4814
June	1st to 10th	Day	35% 8% 13% 24% 19% 1	2660
	11th to 20th	Day	26% 5% 10% 24% 26% 9%	2660
	21st to end	Day	17% 4 8% 18% 34% 18%	2660
July	1st to 10th	Day	9% 2 4 9% 19% 58%	4351
	11th to 20th	Day	11% 1 4 8% 18% 58%	4345
	21st to end	Day	10% 2 3 9% 29% 47%	4639
August	1st to 10th	Day	19% 2 5% 11% 26% 36%	4384
	11th to 20th	Day	10% 2 5% 14% 37% 32%	3889
	21st to end	Day	13% 2 5% 21% 31% 28%	4179
September	1st to 10th	Day	13% 3 4 19% 29% 31%	2280
	11th to 20th	Day	21% 5% 9% 19% 28% 18%	2195
	21st to end	Day	24% 4 8% 24% 27% 13%	2090
October	1st to 10th	Day	28% 4 10% 21% 26% 10%	1997
	11th to 20th	Day	28% 6% 13% 27% 20% 6%	1886
	21st to end	Day	34% 8% 14% 25% 17% 2	1881
November	1st to 10th	Day	42% 8% 14% 23% 13%	1683
	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	45% 16% 14% 14% 8% 2	3736
	11th to 20th	Night	30% 7% 17% 33% 13% 1	3714
	21st to end	Night	38% 14% 20% 20% 7% 1	3488
April	1st to 10th	Night	39% 8% 16% 22% 13% 2	1900
	11th to 20th	Night	35% 7% 15% 26% 14% 3	1879
	21st to end	Night	28% 7% 17% 30% 17% 1	1764
May	1st to 10th	Night	31% 7% 11% 29% 20% 2	2774
	11th to 20th	Night	19% 5% 10% 25% 37% 4	2516
	21st to end	Night	28% 10% 15% 33% 14% 1	2762
June	1st to 10th	Night	34% 8% 17% 25% 15% 1	1520
	11th to 20th	Night	26% 6% 10% 28% 23% 8%	1520
	21st to end	Night	16% 5% 9% 23% 33% 14%	1520
July	1st to 10th	Night	9% 3 3 10% 20% 55%	2500
	11th to 20th	Night	10% 2 4 10% 21% 54%	2492
	21st to end	Night	16% 2 4 7% 31% 40%	2674
August	1st to 10th	Night	21% 2 7% 12% 26% 32%	2521
	11th to 20th	Night	12% 2 5% 13% 37% 31%	3018
	21st to end	Night	14% 3 4 19% 31% 29%	3498
September	1st to 10th	Night	11% 3 5% 18% 31% 32%	1900
	11th to 20th	Night	18% 4 8% 20% 28% 21%	1983
	21st to end	Night	19% 5% 7% 23% 30% 16%	2090
October	1st to 10th	Night	24% 6% 10% 21% 29% 10%	2180
	11th to 20th	Night	23% 5% 13% 27% 26% 6%	2292
	21st to end	Night	30% 8% 16% 22% 21% 3	2717
November	1st to 10th	Night	40% 7% 14% 21% 17% 1	2418
	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	460
	11th to 20th	Day	8% 16% 25% 29% 17% 5%	460
	21st to end	Day	12% 18% 29% 28% 12% 1	506
April	1st to 10th	Day	14% 18% 26% 25% 13% 4	460
	11th to 20th	Day	7% 22% 31% 24% 11% 5%	452
	21st to end	Day	9% 17% 29% 26% 16% 2	460
May	1st to 10th	Day	10% 16% 30% 25% 15% 5%	463
	11th to 20th	Day	15% 16% 23% 22% 18% 5%	488
	21st to end	Day	9% 8% 25% 29% 20% 10%	529
June	1st to 10th	Day	8% 13% 26% 25% 16% 12%	490
	11th to 20th	Day	8% 17% 26% 25% 19% 5%	490
	21st to end	Day	3 7% 27% 30% 22% 11%	490
July	1st to 10th	Day	4 5% 27% 35% 21% 8%	486
	11th to 20th	Day	2 6% 25% 35% 22% 9%	484
	21st to end	Day	2 6% 22% 34% 27% 10%	531
August	1st to 10th	Day	5% 6% 22% 32% 24% 11%	487
	11th to 20th	Day	3 6% 17% 31% 28% 16%	477
	21st to end	Day	3 7% 21% 31% 24% 14%	539
September	1st to 10th	Day	3 4 23% 28% 29% 13%	490
	11th to 20th	Day	6% 8% 21% 30% 24% 11%	490
	21st to end	Day	7% 9% 17% 32% 25% 10%	490
October	1st to 10th	Day	9% 12% 20% 25% 23% 11%	490
	11th to 20th	Day	9% 9% 22% 26% 26% 8%	476
	21st to end	Day	11% 12% 19% 32% 19% 7%	330
November	1st to 10th	Day	15% 12% 18% 30% 21% 3	273
	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% 42% 18% 2	760
	11th to 20th	Night	9% 7% 21% 41% 21% 2	760
	21st to end	Night	8% 10% 26% 41% 14% 1	836
April	1st to 10th	Night	10% 8% 24% 36% 19% 2	760
	11th to 20th	Night	6% 11% 26% 35% 18% 4	751
	21st to end	Night	8% 6% 25% 41% 18% 1	624
May	1st to 10th	Night	6% 9% 25% 39% 18% 2	523
	11th to 20th	Night	8% 5% 19% 36% 28% 4	374
	21st to end	Night	8% 6% 19% 38% 25% 4	411
June	1st to 10th	Night	7% 6% 19% 42% 25% 1	380
	11th to 20th	Night	7% 5% 25% 42% 19% 2	380
	21st to end	Night	4 4 16% 51% 25% 1	380
July	1st to 10th	Night	3 2 15% 52% 26% 1	370
	11th to 20th	Night	16% 61% 21% 1	368
	21st to end	Night	2 1 13% 59% 24% 1	416
August	1st to 10th	Night	3 2 9% 56% 29% 2	378
	11th to 20th	Night	1 2 9% 51% 33% 4	665
	21st to end	Night	3 3 13% 45% 33% 3	836
September	1st to 10th	Night	2 2 10% 45% 38% 4	760
	11th to 20th	Night	4 3 13% 37% 36% 8%	760
	21st to end	Night	5% 4 13% 38% 32% 8%	760
October	1st to 10th	Night	7% 3 14% 43% 28% 4	760
	11th to 20th	Night	7% 5% 18% 38% 27% 5%	760
	21st to end	Night	7% 6% 16% 45% 20% 5%	836
November	1st to 10th	Night	11% 6% 17% 41% 22% 1	744
	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

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