Bucksport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bucksport clear sky chart from 2005-11-06 to 2024-10-24.

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	18% 8% 3 6% 4 4 4 3 5% 7% 36%	101082
	Night	19% 9% 3 7% 4 4 4 3 5% 6% 36%	97698
Transparency	Day	47% 6% 12% 21% 13% 2	100842
	Night	48% 5% 12% 21% 12% 2	97559
Seeing	Day	26% 17% 31% 18% 6% 2	15708
	Night	25% 15% 29% 24% 7% 1	24010

By Month

Percentage Cloud Cover NE (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% 10% 2 6% 4 5% 4 3 4 5% 40%	2517
	11th to 20th	Day	17% 8% 3 6% 4 4 3 3 4 5% 43%	2520
	21st to end	Day	16% 11% 4 9% 4 4 3 3 5% 6% 36%	2813
February	1st to 10th	Day	17% 11% 3 7% 4 4 4 4 5% 6% 35%	1710
	11th to 20th	Day	14% 10% 3 7% 5% 5% 5% 4 5% 5% 36%	1766
	21st to end	Day	13% 11% 3 8% 6% 4 5% 4 5% 5% 35%	1570
March	1st to 10th	Day	25% 12% 4 7% 4 4 4 3 4 5% 30%	3139
	11th to 20th	Day	17% 11% 4 8% 4 5% 5% 3 4 7% 33%	3480
	21st to end	Day	27% 10% 3 7% 3 4 3 3 5% 6% 29%	3816
April	1st to 10th	Day	21% 11% 3 8% 5% 3 3 3 4 5% 32%	2260
	11th to 20th	Day	19% 9% 2 6% 4 4 4 3 5% 7% 38%	2418
	21st to end	Day	21% 10% 3 7% 4 4 4 2 5% 5% 35%	2470
May	1st to 10th	Day	21% 9% 3 7% 4 4 4 4 6% 7% 31%	4106
	11th to 20th	Day	18% 9% 3 7% 4 4 5% 4 6% 7% 32%	4081
	21st to end	Day	16% 7% 2 6% 5% 5% 5% 4 6% 8% 35%	4946
June	1st to 10th	Day	22% 8% 3 8% 5% 4 4 3 5% 7% 30%	2850
	11th to 20th	Day	18% 7% 3 6% 4 4 4 4 6% 7% 36%	2850
	21st to end	Day	24% 8% 2 6% 6% 5% 4 4 5% 7% 29%	2850
July	1st to 10th	Day	15% 6% 3 7% 5% 5% 5% 4 6% 9% 35%	4570
	11th to 20th	Day	15% 7% 2 5% 4 4 4 4 7% 11% 37%	4440
	21st to end	Day	19% 7% 3 6% 4 4 4 4 6% 7% 36%	4739
August	1st to 10th	Day	18% 8% 2 6% 5% 5% 5% 4 6% 8% 33%	4105
	11th to 20th	Day	17% 9% 3 7% 5% 4 5% 4 6% 7% 33%	4045
	21st to end	Day	10% 5% 2 6% 4 5% 4 3 6% 8% 46%	4510
September	1st to 10th	Day	12% 5% 2 5% 4 3 4 3 5% 8% 50%	2185
	11th to 20th	Day	14% 4 2 4 4 4 3 3 4 5% 52%	2090
	21st to end	Day	17% 6% 2 5% 3 4 4 3 5% 7% 43%	2090
October	1st to 10th	Day	18% 6% 2 7% 4 4 5% 3 5% 7% 40%	2038
	11th to 20th	Day	19% 6% 2 6% 4 5% 4 3 5% 6% 41%	1886
	21st to end	Day	22% 10% 3 6% 4 3 3 3 4 6% 36%	1809
November	1st to 10th	Day	18% 7% 2 5% 5% 5% 4 3 6% 5% 40%	1671
	11th to 20th	Day	21% 7% 2 4 3 3 4 4 5% 6% 41%	1677
	21st to end	Day	21% 9% 2 5% 3 3 4 3 3 6% 41%	1520
December	1st to 10th	Day	22% 11% 3 7% 4 4 4 3 4 6% 33%	1411
	11th to 20th	Day	23% 10% 2 6% 4 3 4 2 4 5% 37%	1668
	21st to end	Day	25% 10% 3 5% 4 3 5% 3 4 5% 33%	2466
January	1st to 10th	Night	14% 10% 3 7% 5% 4 4 3 5% 5% 40%	4429
	11th to 20th	Night	14% 9% 3 9% 6% 4 4 3 5% 6% 37%	4440
	21st to end	Night	16% 12% 3 9% 4 4 4 4 5% 6% 33%	4842
February	1st to 10th	Night	16% 10% 4 7% 6% 5% 5% 4 4 6% 33%	2470
	11th to 20th	Night	13% 9% 3 9% 5% 5% 5% 4 4 5% 38%	2296
	21st to end	Night	15% 12% 3 7% 5% 4 4 3 5% 5% 37%	1884
March	1st to 10th	Night	28% 13% 3 6% 3 3 3 3 3 4 30%	3700
	11th to 20th	Night	16% 10% 3 10% 5% 5% 5% 5% 6% 6% 28%	3479
	21st to end	Night	27% 9% 2 6% 5% 5% 5% 3 6% 5% 27%	3816
April	1st to 10th	Night	21% 13% 3 7% 4 4 3 3 4 4 34%	1918
	11th to 20th	Night	19% 8% 2 8% 4 5% 4 4 5% 7% 34%	1711
	21st to end	Night	24% 8% 2 7% 4 3 3 3 5% 6% 34%	1710
May	1st to 10th	Night	24% 8% 3 5% 3 4 4 3 5% 8% 33%	2834
	11th to 20th	Night	18% 7% 3 8% 5% 5% 6% 4 6% 9% 29%	2813
	21st to end	Night	14% 7% 3 7% 5% 5% 5% 4 6% 7% 37%	2659
June	1st to 10th	Night	22% 9% 2 8% 4 4 4 3 6% 7% 30%	1330
	11th to 20th	Night	17% 8% 4 7% 3 4 5% 4 6% 7% 37%	1330
	21st to end	Night	24% 11% 2 7% 4 4 4 5% 5% 5% 29%	1330
July	1st to 10th	Night	15% 7% 3 6% 6% 6% 7% 4 7% 9% 30%	2389
	11th to 20th	Night	17% 7% 2 7% 5% 5% 5% 4 5% 8% 35%	2520
	21st to end	Night	16% 7% 2 6% 3 4 4 4 6% 8% 38%	2770
August	1st to 10th	Night	21% 8% 3 7% 5% 5% 5% 4 5% 7% 29%	2825
	11th to 20th	Night	18% 10% 3 7% 5% 4 5% 4 6% 8% 30%	2782
	21st to end	Night	10% 7% 3 7% 5% 4 5% 3 6% 8% 43%	3142
September	1st to 10th	Night	14% 6% 2 5% 3 3 4 5% 5% 7% 49%	1994
	11th to 20th	Night	16% 6% 2 4 2 2 3 3 5% 7% 50%	2090
	21st to end	Night	18% 7% 2 4 4 3 4 3 5% 7% 43%	2090
October	1st to 10th	Night	18% 6% 2 7% 4 4 5% 3 5% 5% 41%	2142
	11th to 20th	Night	18% 6% 2 6% 4 4 4 3 4 6% 42%	2292
	21st to end	Night	24% 10% 2 5% 4 3 4 3 4 5% 37%	2614
November	1st to 10th	Night	19% 7% 2 6% 5% 4 3 3 4 5% 42%	2407
	11th to 20th	Night	18% 6% 2 6% 5% 5% 4 4 5% 6% 40%	2500
	21st to end	Night	18% 9% 2 5% 3 4 4 3 5% 6% 39%	2660
December	1st to 10th	Night	23% 9% 4 6% 4 4 4 3 5% 6% 33%	2764
	11th to 20th	Night	23% 9% 2 5% 4 3 3 2 4 5% 38%	3531
	21st to end	Night	25% 9% 3 6% 3 3 3 3 4 5% 36%	5195

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 14% 25% 10% 1	2518
	11th to 20th	Day	43% 4 13% 26% 12% 2	2520
	21st to end	Day	48% 5% 14% 19% 13% 1	2813
February	1st to 10th	Day	49% 5% 12% 19% 14% 3	1710
	11th to 20th	Day	48% 5% 11% 21% 14% 1	1774
	21st to end	Day	49% 5% 11% 20% 10% 5%	1570
March	1st to 10th	Day	58% 4 8% 13% 14% 3	3142
	11th to 20th	Day	50% 6% 11% 18% 13% 3	3480
	21st to end	Day	55% 5% 6% 15% 15% 4	3816
April	1st to 10th	Day	53% 4 8% 16% 14% 4	2260
	11th to 20th	Day	47% 4 10% 23% 15% 2	2418
	21st to end	Day	52% 3 8% 18% 15% 4	2470
May	1st to 10th	Day	50% 7% 13% 19% 10% 2	4120
	11th to 20th	Day	48% 8% 14% 20% 9% 1	4085
	21st to end	Day	42% 11% 15% 18% 14% 1	4946
June	1st to 10th	Day	52% 7% 12% 19% 9% 1	2850
	11th to 20th	Day	46% 6% 11% 19% 15% 2	2850
	21st to end	Day	53% 7% 12% 18% 9% 2	2850
July	1st to 10th	Day	45% 6% 12% 25% 11%	4500
	11th to 20th	Day	40% 7% 16% 25% 11%	4365
	21st to end	Day	46% 7% 11% 22% 13% 1	4588
August	1st to 10th	Day	48% 7% 14% 25% 5%	4092
	11th to 20th	Day	49% 6% 16% 21% 8%	4084
	21st to end	Day	34% 5% 14% 26% 20% 1	4510
September	1st to 10th	Day	33% 6% 15% 27% 18% 1	2185
	11th to 20th	Day	34% 5% 9% 28% 20% 3	2090
	21st to end	Day	40% 6% 10% 27% 17% 1	2090
October	1st to 10th	Day	44% 6% 11% 23% 15% 1	2038
	11th to 20th	Day	44% 4 13% 28% 11% 1	1886
	21st to end	Day	50% 3 12% 21% 12% 1	1809
November	1st to 10th	Day	44% 5% 13% 22% 14% 1	1671
	11th to 20th	Day	43% 5% 10% 22% 18% 3	1677
	21st to end	Day	46% 5% 15% 23% 10% 1	1520
December	1st to 10th	Day	52% 5% 10% 21% 11% 1	1411
	11th to 20th	Day	51% 3 10% 19% 14% 2	1668
	21st to end	Day	54% 5% 11% 19% 8% 3	2466
January	1st to 10th	Night	45% 5% 13% 26% 10% 2	4429
	11th to 20th	Night	48% 5% 14% 20% 11% 3	4440
	21st to end	Night	52% 5% 10% 21% 11% 1	4842
February	1st to 10th	Night	52% 4 11% 18% 12% 2	2470
	11th to 20th	Night	47% 5% 9% 20% 16% 2	2299
	21st to end	Night	47% 4 9% 19% 15% 4	1884
March	1st to 10th	Night	59% 3 8% 16% 11% 3	3710
	11th to 20th	Night	52% 8% 13% 16% 10% 2	3480
	21st to end	Night	57% 5% 5% 15% 15% 2	3816
April	1st to 10th	Night	54% 4 7% 15% 17% 3	1918
	11th to 20th	Night	48% 5% 9% 22% 14% 2	1711
	21st to end	Night	52% 3 11% 17% 14% 3	1710
May	1st to 10th	Night	49% 6% 17% 20% 8% 1	2840
	11th to 20th	Night	49% 10% 16% 18% 7% 1	2814
	21st to end	Night	43% 10% 14% 21% 11% 1	2660
June	1st to 10th	Night	53% 5% 11% 21% 9% 1	1330
	11th to 20th	Night	44% 8% 14% 21% 11% 2	1330
	21st to end	Night	56% 6% 9% 18% 8% 2	1330
July	1st to 10th	Night	49% 8% 12% 19% 12%	2349
	11th to 20th	Night	46% 8% 13% 25% 9%	2472
	21st to end	Night	44% 6% 13% 25% 11% 1	2681
August	1st to 10th	Night	55% 7% 13% 19% 7%	2813
	11th to 20th	Night	51% 7% 14% 19% 10%	2809
	21st to end	Night	37% 7% 13% 24% 18% 1	3142
September	1st to 10th	Night	34% 5% 13% 30% 17% 1	1994
	11th to 20th	Night	35% 5% 11% 29% 19% 2	2090
	21st to end	Night	40% 5% 9% 28% 16% 1	2090
October	1st to 10th	Night	44% 5% 11% 24% 14% 2	2142
	11th to 20th	Night	42% 5% 11% 27% 13% 1	2292
	21st to end	Night	50% 4 11% 21% 13% 1	2614
November	1st to 10th	Night	45% 5% 11% 24% 15% 1	2407
	11th to 20th	Night	44% 5% 9% 23% 17% 2	2500
	21st to end	Night	44% 5% 14% 21% 15% 2	2660
December	1st to 10th	Night	53% 4 10% 20% 12% 1	2764
	11th to 20th	Night	48% 3 10% 21% 16% 1	3532
	21st to end	Night	51% 4 14% 17% 12% 2	5195

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	33% 22% 25% 16% 4	180
	11th to 20th	Day	38% 18% 29% 12% 3 1	180
	21st to end	Day	27% 21% 32% 17% 2	226
February	1st to 10th	Day	29% 20% 31% 16% 4	370
	11th to 20th	Day	30% 28% 30% 10% 2	415
	21st to end	Day	27% 23% 32% 13% 4	382
March	1st to 10th	Day	31% 23% 30% 14% 2	460
	11th to 20th	Day	28% 24% 30% 15% 2 1	460
	21st to end	Day	34% 20% 27% 12% 4 2	506
April	1st to 10th	Day	37% 22% 26% 9% 4 2	460
	11th to 20th	Day	34% 24% 26% 12% 5% 1	452
	21st to end	Day	30% 23% 30% 13% 3 1	460
May	1st to 10th	Day	31% 20% 32% 13% 3 1	463
	11th to 20th	Day	25% 18% 35% 17% 4 1	487
	21st to end	Day	24% 19% 33% 19% 5% 1	612
June	1st to 10th	Day	26% 15% 30% 19% 9% 1	680
	11th to 20th	Day	23% 15% 30% 21% 10% 1	680
	21st to end	Day	28% 14% 27% 23% 8% 1	680
July	1st to 10th	Day	23% 13% 33% 20% 10% 1	563
	11th to 20th	Day	18% 11% 39% 23% 8% 1	484
	21st to end	Day	18% 11% 40% 21% 8% 2	532
August	1st to 10th	Day	18% 11% 33% 27% 9% 2	486
	11th to 20th	Day	20% 12% 28% 26% 11% 3	479
	21st to end	Day	18% 11% 32% 26% 10% 3	539
September	1st to 10th	Day	16% 12% 38% 23% 8% 3	490
	11th to 20th	Day	22% 10% 30% 19% 12% 7%	490
	21st to end	Day	19% 15% 32% 19% 10% 5%	490
October	1st to 10th	Day	21% 16% 27% 21% 12% 2	463
	11th to 20th	Day	27% 14% 30% 18% 7% 3	390
	21st to end	Day	35% 14% 29% 17% 5% 1	405
November	1st to 10th	Day	27% 16% 28% 20% 7% 2	365
	11th to 20th	Day	31% 15% 33% 15% 4 1	370
	21st to end	Day	33% 20% 25% 17% 5%	370
December	1st to 10th	Day	30% 19% 32% 15% 3	261
	11th to 20th	Day	39% 24% 27% 9% 1	180
	21st to end	Day	40% 19% 23% 14% 4	198
January	1st to 10th	Night	27% 21% 30% 18% 4	760
	11th to 20th	Night	31% 20% 30% 16% 3	760
	21st to end	Night	22% 22% 33% 18% 4	836
February	1st to 10th	Night	25% 22% 29% 21% 3	760
	11th to 20th	Night	24% 21% 36% 16% 3	743
	21st to end	Night	25% 19% 32% 21% 3	628
March	1st to 10th	Night	27% 19% 34% 19% 2	760
	11th to 20th	Night	24% 20% 31% 19% 6%	760
	21st to end	Night	26% 19% 29% 20% 5% 1	836
April	1st to 10th	Night	32% 16% 32% 17% 3 1	760
	11th to 20th	Night	24% 16% 33% 22% 5%	587
	21st to end	Night	30% 13% 30% 22% 5%	570
May	1st to 10th	Night	28% 9% 34% 23% 6%	570
	11th to 20th	Night	26% 12% 33% 24% 5% 1	562
	21st to end	Night	22% 10% 32% 27% 8%	451
June	1st to 10th	Night	26% 11% 25% 31% 8% 1	380
	11th to 20th	Night	21% 9% 26% 34% 11%	380
	21st to end	Night	29% 8% 21% 35% 7%	380
July	1st to 10th	Night	21% 6% 26% 36% 11%	370
	11th to 20th	Night	21% 4 21% 41% 13% 1	368
	21st to end	Night	21% 6% 20% 38% 13% 1	435
August	1st to 10th	Night	19% 5% 25% 39% 11% 1	568
	11th to 20th	Night	20% 7% 24% 35% 13% 1	562
	21st to end	Night	17% 7% 25% 35% 15% 1	632
September	1st to 10th	Night	17% 6% 32% 30% 14% 1	760
	11th to 20th	Night	20% 9% 24% 27% 16% 4	760
	21st to end	Night	20% 11% 26% 27% 14% 2	760
October	1st to 10th	Night	23% 9% 23% 28% 15% 1	760
	11th to 20th	Night	21% 14% 28% 25% 10% 2	760
	21st to end	Night	31% 16% 26% 21% 5%	805
November	1st to 10th	Night	25% 14% 28% 24% 7% 1	740
	11th to 20th	Night	27% 16% 29% 19% 8% 1	775
	21st to end	Night	28% 20% 27% 20% 5%	850
December	1st to 10th	Night	30% 16% 34% 16% 4	850
	11th to 20th	Night	29% 23% 28% 17% 3	850
	21st to end	Night	30% 22% 27% 18% 3	922

Page generated at 2024-10-21 02:20:03. Version ac07

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