Jonesport
Clear Sky Chart
History

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

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	20% 9% 3 6% 4 4 4 3 5% 7% 34%	101384
	Night	21% 10% 3 7% 4 4 4 3 5% 6% 34%	97795
Transparency	Day	27% 46% 7% 12% 7% 1	104932
	Night	27% 46% 6% 12% 7% 1	102337
Seeing	Day	24% 7% 25% 27% 14% 2	16113
	Night	25% 9% 26% 26% 12% 2	24223

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	20% 9% 3 7% 3 3 4 4 5% 7% 36%	2399
	11th to 20th	Day	19% 8% 2 6% 3 3 3 3 4 5% 43%	2520
	21st to end	Day	17% 10% 4 8% 5% 5% 4 3 6% 8% 31%	2973
February	1st to 10th	Day	20% 12% 3 5% 6% 4 4 5% 5% 8% 28%	1710
	11th to 20th	Day	15% 12% 3 7% 5% 4 4 4 6% 8% 33%	1705
	21st to end	Day	14% 11% 2 7% 5% 5% 4 5% 5% 5% 36%	1570
March	1st to 10th	Day	26% 10% 3 7% 4 4 3 3 5% 6% 29%	3229
	11th to 20th	Day	19% 9% 3 6% 4 4 5% 4 6% 6% 33%	3480
	21st to end	Day	28% 10% 3 6% 4 4 4 3 4 5% 29%	3816
April	1st to 10th	Day	21% 10% 3 6% 4 3 4 4 5% 6% 34%	2212
	11th to 20th	Day	21% 8% 2 5% 3 3 3 3 4 7% 39%	2442
	21st to end	Day	21% 7% 3 6% 5% 3 5% 3 5% 6% 37%	2470
May	1st to 10th	Day	19% 9% 3 7% 5% 4 4 4 5% 8% 31%	4106
	11th to 20th	Day	18% 7% 3 6% 4 4 5% 4 6% 7% 36%	4081
	21st to end	Day	19% 10% 3 6% 4 4 5% 4 6% 8% 32%	4954
June	1st to 10th	Day	24% 9% 3 7% 5% 4 4 4 5% 6% 30%	2850
	11th to 20th	Day	20% 9% 2 6% 5% 4 4 4 4 6% 36%	2850
	21st to end	Day	28% 11% 3 6% 4 4 3 3 4 6% 27%	2850
July	1st to 10th	Day	21% 12% 4 10% 5% 4 4 3 5% 7% 26%	4760
	11th to 20th	Day	19% 9% 3 8% 5% 4 4 4 5% 8% 32%	4446
	21st to end	Day	21% 10% 3 7% 5% 5% 5% 4 6% 6% 30%	4600
August	1st to 10th	Day	22% 11% 3 8% 4 5% 4 3 4 6% 29%	4105
	11th to 20th	Day	17% 11% 4 8% 5% 4 4 3 5% 7% 32%	4045
	21st to end	Day	11% 7% 3 6% 4 4 4 3 4 6% 47%	4532
September	1st to 10th	Day	15% 6% 2 5% 3 3 4 3 5% 8% 47%	2205
	11th to 20th	Day	16% 7% 2 4 3 3 3 3 5% 6% 48%	2090
	21st to end	Day	18% 9% 3 5% 3 3 3 3 4 6% 42%	2090
October	1st to 10th	Day	16% 8% 2 6% 3 3 4 4 5% 7% 41%	1988
	11th to 20th	Day	18% 5% 2 5% 4 4 4 4 5% 7% 42%	1900
	21st to end	Day	21% 8% 3 6% 3 4 3 3 6% 6% 39%	1938
November	1st to 10th	Day	18% 8% 2 6% 4 4 4 3 5% 6% 40%	1752
	11th to 20th	Day	21% 5% 2 5% 3 3 3 4 6% 6% 42%	1586
	21st to end	Day	21% 10% 2 5% 4 3 3 3 5% 6% 38%	1520
December	1st to 10th	Day	24% 9% 3 6% 4 3 4 4 5% 6% 32%	1511
	11th to 20th	Day	25% 10% 3 7% 4 4 4 3 4 6% 29%	1668
	21st to end	Day	26% 8% 2 6% 4 4 3 3 4 6% 34%	2431
January	1st to 10th	Night	16% 11% 3 8% 5% 3 4 3 5% 6% 38%	4547
	11th to 20th	Night	15% 11% 5% 9% 5% 5% 4 4 5% 6% 33%	4440
	21st to end	Night	19% 11% 4 8% 4 4 4 4 6% 6% 30%	4681
February	1st to 10th	Night	19% 10% 3 7% 5% 4 4 5% 7% 8% 27%	2470
	11th to 20th	Night	16% 11% 3 7% 4 4 5% 3 5% 6% 35%	2361
	21st to end	Night	16% 11% 4 7% 5% 4 4 4 4 7% 36%	1884
March	1st to 10th	Night	26% 12% 3 7% 3 3 3 2 4 4 31%	3611
	11th to 20th	Night	15% 11% 3 9% 5% 5% 5% 5% 6% 7% 27%	3479
	21st to end	Night	30% 8% 2 7% 4 4 4 4 5% 4 27%	3816
April	1st to 10th	Night	24% 11% 2 5% 4 3 4 3 5% 6% 33%	1964
	11th to 20th	Night	22% 10% 3 6% 4 3 4 4 5% 6% 35%	1688
	21st to end	Night	26% 9% 3 6% 4 3 4 3 5% 5% 32%	1710
May	1st to 10th	Night	23% 8% 3 8% 3 3 3 3 4 7% 35%	2834
	11th to 20th	Night	19% 7% 3 8% 5% 4 5% 5% 7% 7% 30%	2813
	21st to end	Night	17% 13% 4 7% 5% 3 4 3 6% 6% 32%	2642
June	1st to 10th	Night	28% 10% 3 6% 4 4 4 3 5% 8% 25%	1330
	11th to 20th	Night	23% 10% 1 7% 4 3 4 3 4 7% 34%	1330
	21st to end	Night	30% 10% 3 6% 4 4 3 3 4 5% 27%	1330
July	1st to 10th	Night	23% 13% 4 8% 5% 4 4 4 6% 6% 23%	2210
	11th to 20th	Night	23% 9% 3 7% 4 3 4 3 6% 8% 30%	2510
	21st to end	Night	19% 11% 3 8% 5% 3 4 4 6% 7% 31%	2919
August	1st to 10th	Night	24% 13% 4 8% 4 3 4 3 5% 6% 25%	2825
	11th to 20th	Night	20% 11% 3 7% 5% 4 5% 4 5% 7% 28%	2782
	21st to end	Night	12% 7% 4 7% 3 3 4 3 5% 6% 45%	3124
September	1st to 10th	Night	16% 7% 2 5% 3 3 4 3 4 7% 46%	1972
	11th to 20th	Night	17% 8% 2 4 3 2 2 4 5% 6% 46%	2090
	21st to end	Night	19% 7% 2 6% 3 2 4 3 4 6% 44%	2090
October	1st to 10th	Night	19% 6% 2 5% 4 4 4 3 5% 7% 41%	2190
	11th to 20th	Night	19% 5% 2 5% 4 4 3 3 5% 7% 43%	2280
	21st to end	Night	23% 9% 3 5% 4 3 3 3 4 6% 39%	2658
November	1st to 10th	Night	19% 7% 2 5% 4 3 4 3 5% 6% 41%	2531
	11th to 20th	Night	19% 8% 2 6% 5% 4 4 4 5% 6% 38%	2593
	21st to end	Night	19% 7% 3 6% 4 3 4 4 7% 7% 36%	2660
December	1st to 10th	Night	27% 10% 3 7% 4 3 4 3 6% 7% 27%	2664
	11th to 20th	Night	25% 9% 2 5% 4 4 4 4 5% 6% 33%	3531
	21st to end	Night	25% 10% 3 6% 4 3 4 3 5% 6% 33%	5236

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	31% 37% 10% 16% 5% 1	2400
	11th to 20th	Day	25% 36% 7% 19% 10% 2	2520
	21st to end	Day	33% 41% 8% 10% 7%	2973
February	1st to 10th	Day	19% 64% 4 6% 5% 1	1710
	11th to 20th	Day	19% 63% 2 8% 7%	1713
	21st to end	Day	16% 64% 4 7% 6% 3	1570
March	1st to 10th	Day	39% 40% 4 8% 6% 3	3233
	11th to 20th	Day	30% 43% 9% 9% 7% 1	3480
	21st to end	Day	41% 39% 2 6% 9% 2	3816
April	1st to 10th	Day	19% 64% 3 7% 5% 2	2212
	11th to 20th	Day	15% 65% 4 10% 4 1	2442
	21st to end	Day	19% 64% 2 7% 6% 1	2470
May	1st to 10th	Day	29% 43% 11% 14% 3	4120
	11th to 20th	Day	28% 42% 11% 15% 3	4085
	21st to end	Day	31% 41% 9% 10% 9%	4954
June	1st to 10th	Day	17% 65% 3 10% 5%	2850
	11th to 20th	Day	16% 64% 4 9% 6% 1	2850
	21st to end	Day	18% 62% 3 9% 7% 1	2850
July	1st to 10th	Day	41% 36% 4 12% 7%	4685
	11th to 20th	Day	33% 37% 9% 15% 6%	4370
	21st to end	Day	34% 37% 8% 13% 7% 1	4453
August	1st to 10th	Day	38% 38% 6% 14% 4	4092
	11th to 20th	Day	35% 38% 12% 11% 4	4084
	21st to end	Day	22% 38% 7% 17% 16%	4532
September	1st to 10th	Day	14% 59% 5% 13% 9% 1	2205
	11th to 20th	Day	18% 59% 4 11% 7% 1	2090
	21st to end	Day	14% 59% 4 13% 8% 1	2090
October	1st to 10th	Day	29% 38% 9% 16% 7%	3300
	11th to 20th	Day	14% 37% 5% 27% 17%	3140
	21st to end	Day	19% 37% 13% 16% 12% 3	3175
November	1st to 10th	Day	22% 55% 6% 11% 5% 1	1752
	11th to 20th	Day	18% 59% 4 9% 9% 2	1586
	21st to end	Day	19% 59% 6% 9% 7%	1520
December	1st to 10th	Day	22% 59% 5% 10% 5%	1511
	11th to 20th	Day	33% 48% 3 9% 7%	1668
	21st to end	Day	33% 39% 7% 10% 8% 2	2431
January	1st to 10th	Night	28% 37% 7% 20% 6% 2	4547
	11th to 20th	Night	32% 37% 8% 13% 8% 1	4440
	21st to end	Night	36% 39% 6% 12% 5%	4681
February	1st to 10th	Night	19% 64% 4 6% 6% 1	2470
	11th to 20th	Night	18% 63% 1 9% 8% 1	2364
	21st to end	Night	17% 64% 2 6% 7% 3	1884
March	1st to 10th	Night	38% 40% 5% 8% 7% 3	3620
	11th to 20th	Night	30% 45% 9% 8% 8% 1	3480
	21st to end	Night	42% 40% 2 7% 8% 1	3816
April	1st to 10th	Night	19% 64% 2 5% 8% 3	1964
	11th to 20th	Night	19% 66% 2 8% 4 1	1688
	21st to end	Night	19% 64% 4 5% 6% 1	1710
May	1st to 10th	Night	30% 41% 13% 13% 3	2840
	11th to 20th	Night	29% 43% 13% 12% 3	2814
	21st to end	Night	31% 42% 10% 13% 4	2643
June	1st to 10th	Night	19% 65% 2 9% 3 1	1330
	11th to 20th	Night	17% 64% 4 10% 5% 1	1330
	21st to end	Night	19% 63% 2 11% 5% 1	1330
July	1st to 10th	Night	41% 37% 6% 10% 6%	2175
	11th to 20th	Night	34% 38% 8% 14% 6%	2463
	21st to end	Night	32% 37% 7% 13% 10% 1	2826
August	1st to 10th	Night	42% 37% 5% 12% 4	2813
	11th to 20th	Night	34% 39% 9% 13% 4	2809
	21st to end	Night	23% 39% 5% 18% 14% 1	3124
September	1st to 10th	Night	14% 59% 4 15% 8% 1	1972
	11th to 20th	Night	19% 59% 4 11% 6% 1	2090
	21st to end	Night	16% 59% 3 13% 8% 1	2090
October	1st to 10th	Night	26% 38% 10% 16% 10% 1	3658
	11th to 20th	Night	17% 36% 6% 20% 19%	3779
	21st to end	Night	23% 36% 5% 22% 11% 2	4371
November	1st to 10th	Night	20% 56% 7% 10% 7% 1	2531
	11th to 20th	Night	18% 59% 3 10% 9% 1	2593
	21st to end	Night	19% 59% 5% 7% 8% 1	2660
December	1st to 10th	Night	24% 59% 3 8% 6%	2664
	11th to 20th	Night	27% 49% 4 10% 9% 1	3532
	21st to end	Night	33% 38% 8% 12% 7% 3	5236

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	24% 16% 38% 13% 8% 1	180
	11th to 20th	Day	27% 16% 32% 20% 5% 1	180
	21st to end	Day	21% 11% 38% 21% 7% 1	321
February	1st to 10th	Day	26% 14% 34% 20% 6%	370
	11th to 20th	Day	22% 16% 43% 16% 3	386
	21st to end	Day	19% 16% 34% 24% 7%	382
March	1st to 10th	Day	25% 12% 34% 25% 5%	460
	11th to 20th	Day	20% 16% 32% 23% 9% 1	460
	21st to end	Day	25% 11% 31% 24% 7% 2	506
April	1st to 10th	Day	27% 10% 33% 22% 5% 2	460
	11th to 20th	Day	25% 8% 32% 26% 7% 2	452
	21st to end	Day	23% 7% 32% 27% 10% 1	460
May	1st to 10th	Day	25% 8% 29% 28% 9% 1	463
	11th to 20th	Day	21% 4 25% 35% 14% 2	487
	21st to end	Day	29% 3 24% 28% 14% 2	716
June	1st to 10th	Day	26% 4 22% 31% 15% 2	680
	11th to 20th	Day	25% 3 18% 32% 18% 5%	680
	21st to end	Day	34% 3 14% 31% 16% 2	680
July	1st to 10th	Day	26% 4 13% 33% 20% 3	670
	11th to 20th	Day	25% 3 10% 36% 22% 4	489
	21st to end	Day	23% 3 15% 32% 23% 4	532
August	1st to 10th	Day	18% 2 17% 33% 26% 4	486
	11th to 20th	Day	22% 3 14% 32% 23% 5%	479
	21st to end	Day	21% 2 15% 33% 24% 6%	539
September	1st to 10th	Day	17% 3 18% 35% 24% 3	490
	11th to 20th	Day	21% 4 21% 27% 20% 6%	490
	21st to end	Day	20% 3 23% 30% 20% 5%	490
October	1st to 10th	Day	19% 6% 22% 30% 19% 4	435
	11th to 20th	Day	18% 7% 27% 27% 17% 3	390
	21st to end	Day	26% 7% 29% 27% 10% 1	429
November	1st to 10th	Day	21% 12% 31% 25% 10% 2	392
	11th to 20th	Day	23% 12% 35% 23% 6% 1	370
	21st to end	Day	26% 14% 33% 20% 6% 1	370
December	1st to 10th	Day	26% 9% 39% 21% 4 1	361
	11th to 20th	Day	31% 17% 33% 15% 4 1	180
	21st to end	Day	30% 16% 30% 17% 6% 1	198
January	1st to 10th	Night	25% 17% 34% 19% 5%	792
	11th to 20th	Night	27% 17% 33% 18% 4	760
	21st to end	Night	20% 17% 37% 20% 4	836
February	1st to 10th	Night	25% 16% 37% 18% 4	760
	11th to 20th	Night	21% 21% 35% 19% 3 1	743
	21st to end	Night	21% 14% 38% 21% 5%	628
March	1st to 10th	Night	23% 13% 38% 23% 2	760
	11th to 20th	Night	23% 12% 31% 25% 8% 1	760
	21st to end	Night	25% 9% 33% 24% 8% 1	836
April	1st to 10th	Night	30% 8% 32% 23% 6%	732
	11th to 20th	Night	28% 5% 29% 29% 9%	564
	21st to end	Night	29% 4 26% 25% 13% 3	570
May	1st to 10th	Night	28% 2 24% 32% 12% 3	570
	11th to 20th	Night	29% 3 17% 35% 14% 1	562
	21st to end	Night	28% 2 20% 33% 14% 3	548
June	1st to 10th	Night	31% 2 16% 31% 17% 2	380
	11th to 20th	Night	28% 2 12% 36% 20% 3	380
	21st to end	Night	35% 2 9% 36% 16% 2	380
July	1st to 10th	Night	28% 4 10% 34% 23% 1	370
	11th to 20th	Night	29% 3 8% 32% 25% 3	368
	21st to end	Night	28% 2 8% 31% 28% 3	520
August	1st to 10th	Night	23% 3 9% 37% 24% 3	568
	11th to 20th	Night	26% 3 8% 33% 27% 4	562
	21st to end	Night	19% 2 9% 36% 28% 6%	627
September	1st to 10th	Night	17% 3 14% 38% 25% 3	689
	11th to 20th	Night	23% 2 19% 28% 23% 6%	760
	21st to end	Night	22% 3 21% 31% 18% 5%	760
October	1st to 10th	Night	23% 4 23% 29% 19% 3	760
	11th to 20th	Night	22% 7% 28% 26% 14% 3	760
	21st to end	Night	28% 10% 29% 25% 8%	836
November	1st to 10th	Night	24% 8% 30% 25% 11% 1	779
	11th to 20th	Night	22% 15% 32% 22% 9% 1	818
	21st to end	Night	23% 17% 32% 20% 8% 1	850
December	1st to 10th	Night	33% 10% 35% 18% 5%	850
	11th to 20th	Night	26% 21% 33% 16% 3	850
	21st to end	Night	29% 17% 33% 17% 4	935

Page generated at 2024-11-07 06:55:44. Version ac07

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