Millinocket
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Millinocket clear sky chart from 2005-11-06 to 2024-12-24.

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% 9% 3 7% 5% 5% 5% 4 5% 7% 33%	101757
	Night	18% 9% 3 7% 5% 4 4 4 5% 6% 34%	98378
Transparency	Day	49% 7% 12% 20% 11% 1	105264
	Night	48% 7% 13% 20% 11% 1	102963
Seeing	Day	24% 16% 30% 20% 8% 2	15946
	Night	23% 13% 31% 25% 7%	24233

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	14% 13% 4 8% 5% 4 4 3 6% 6% 34%	2407
	11th to 20th	Day	14% 10% 4 11% 7% 5% 3 3 5% 5% 32%	2520
	21st to end	Day	12% 12% 5% 10% 6% 5% 6% 3 4 5% 31%	2772
February	1st to 10th	Day	14% 13% 5% 8% 8% 6% 5% 4 5% 6% 28%	1699
	11th to 20th	Day	13% 10% 5% 10% 8% 5% 5% 3 5% 6% 30%	1739
	21st to end	Day	13% 12% 3 9% 6% 5% 4 4 5% 6% 32%	1570
March	1st to 10th	Day	23% 14% 4 7% 4 4 4 3 4 5% 28%	3138
	11th to 20th	Day	18% 16% 4 8% 6% 4 5% 4 5% 5% 25%	3480
	21st to end	Day	25% 12% 4 6% 5% 4 3 3 4 6% 28%	3816
April	1st to 10th	Day	21% 11% 3 7% 5% 4 5% 3 5% 6% 29%	2266
	11th to 20th	Day	19% 9% 2 6% 4 5% 5% 3 5% 6% 35%	2435
	21st to end	Day	24% 10% 3 7% 4 4 3 3 4 6% 33%	2470
May	1st to 10th	Day	18% 9% 3 8% 5% 4 5% 4 5% 5% 33%	4106
	11th to 20th	Day	22% 7% 2 7% 5% 4 5% 5% 5% 7% 29%	4134
	21st to end	Day	15% 7% 3 7% 5% 5% 5% 5% 7% 8% 32%	5141
June	1st to 10th	Day	22% 8% 3 8% 5% 4 5% 3 6% 7% 29%	2850
	11th to 20th	Day	18% 8% 2 6% 5% 4 4 4 6% 8% 35%	2850
	21st to end	Day	24% 7% 3 6% 5% 6% 5% 4 6% 7% 27%	2850
July	1st to 10th	Day	13% 6% 2 6% 5% 5% 6% 5% 7% 9% 34%	4743
	11th to 20th	Day	14% 6% 3 7% 4 5% 6% 4 7% 8% 37%	4440
	21st to end	Day	15% 7% 2 6% 5% 5% 5% 4 6% 8% 37%	4814
August	1st to 10th	Day	16% 7% 2 7% 5% 5% 5% 5% 7% 9% 32%	4105
	11th to 20th	Day	15% 8% 3 7% 5% 5% 6% 5% 7% 8% 31%	4045
	21st to end	Day	14% 6% 2 7% 4 4 5% 4 6% 8% 40%	4532
September	1st to 10th	Day	12% 5% 2 6% 5% 4 4 3 6% 7% 46%	2210
	11th to 20th	Day	14% 5% 3 5% 4 3 4 3 4 6% 49%	2090
	21st to end	Day	17% 7% 3 6% 3 4 4 3 6% 7% 41%	2090
October	1st to 10th	Day	18% 6% 3 7% 4 4 5% 3 5% 7% 39%	2025
	11th to 20th	Day	20% 10% 3 7% 4 4 5% 4 5% 6% 33%	1869
	21st to end	Day	22% 12% 3 7% 4 4 4 3 4 6% 30%	1881
November	1st to 10th	Day	19% 9% 3 7% 5% 4 5% 4 4 6% 34%	1761
	11th to 20th	Day	19% 10% 3 7% 5% 5% 4 4 5% 6% 33%	1694
	21st to end	Day	21% 10% 3 7% 5% 4 3 4 5% 6% 32%	1600
December	1st to 10th	Day	22% 13% 4 8% 6% 5% 4 4 4 5% 26%	1425
	11th to 20th	Day	22% 11% 4 6% 5% 4 3 3 4 5% 32%	1738
	21st to end	Day	22% 11% 4 7% 3 4 4 3 5% 6% 30%	2452
January	1st to 10th	Night	13% 12% 4 10% 6% 6% 4 4 5% 6% 31%	4525
	11th to 20th	Night	13% 10% 3 10% 7% 6% 6% 4 6% 6% 27%	4440
	21st to end	Night	12% 11% 5% 10% 6% 6% 6% 4 6% 6% 28%	4884
February	1st to 10th	Night	12% 13% 4 9% 5% 5% 5% 4 6% 6% 30%	2480
	11th to 20th	Night	11% 11% 4 9% 7% 6% 5% 4 5% 7% 31%	2325
	21st to end	Night	15% 11% 4 8% 5% 4 4 3 5% 5% 35%	1884
March	1st to 10th	Night	25% 12% 3 7% 5% 4 4 3 4 4 29%	3702
	11th to 20th	Night	16% 13% 4 10% 5% 5% 5% 4 6% 6% 25%	3479
	21st to end	Night	26% 12% 2 6% 3 3 5% 4 6% 7% 26%	3816
April	1st to 10th	Night	22% 12% 3 6% 5% 4 3 3 4 4 32%	1911
	11th to 20th	Night	20% 9% 2 7% 4 4 3 3 5% 6% 38%	1693
	21st to end	Night	25% 9% 2 6% 5% 4 4 3 5% 7% 31%	1710
May	1st to 10th	Night	24% 6% 2 5% 4 4 4 3 5% 7% 34%	2834
	11th to 20th	Night	20% 9% 4 8% 6% 5% 5% 5% 7% 6% 25%	2789
	21st to end	Night	16% 6% 2 6% 4 4 4 4 5% 9% 40%	2444
June	1st to 10th	Night	22% 9% 3 7% 5% 4 5% 4 6% 7% 30%	1330
	11th to 20th	Night	15% 7% 2 8% 4 5% 5% 4 5% 9% 36%	1330
	21st to end	Night	25% 8% 3 6% 4 4 4 3 6% 7% 31%	1330
July	1st to 10th	Night	11% 7% 2 6% 5% 4 6% 4 7% 9% 39%	2210
	11th to 20th	Night	17% 7% 2 6% 3 4 4 4 6% 7% 40%	2519
	21st to end	Night	14% 6% 2 6% 4 4 5% 4 5% 8% 41%	2739
August	1st to 10th	Night	20% 6% 3 8% 5% 6% 5% 4 6% 7% 31%	2792
	11th to 20th	Night	13% 9% 3 7% 5% 5% 5% 4 7% 8% 34%	2782
	21st to end	Night	13% 7% 3 6% 4 3 3 3 4 6% 48%	3124
September	1st to 10th	Night	13% 5% 1 5% 3 3 4 4 5% 8% 48%	1966
	11th to 20th	Night	14% 6% 1 4 3 3 3 4 4 7% 49%	2090
	21st to end	Night	18% 7% 2 6% 4 3 4 3 5% 7% 42%	2090
October	1st to 10th	Night	19% 6% 3 5% 4 5% 3 3 5% 7% 40%	2154
	11th to 20th	Night	18% 7% 2 7% 5% 4 4 3 6% 6% 38%	2308
	21st to end	Night	23% 10% 3 6% 4 3 4 3 4 6% 34%	2717
November	1st to 10th	Night	18% 8% 2 7% 4 4 5% 4 5% 7% 35%	2537
	11th to 20th	Night	18% 8% 3 7% 5% 4 4 4 5% 6% 36%	2705
	21st to end	Night	19% 9% 3 7% 5% 4 4 4 6% 7% 31%	2800
December	1st to 10th	Night	21% 12% 4 8% 5% 4 4 4 5% 5% 27%	2970
	11th to 20th	Night	23% 9% 3 6% 5% 4 4 4 4 6% 32%	3681
	21st to end	Night	22% 11% 3 6% 4 3 3 3 4 5% 35%	5288

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	49% 7% 15% 22% 8% 1	2408
	11th to 20th	Day	51% 5% 9% 22% 11% 1	2520
	21st to end	Day	52% 9% 10% 15% 12% 1	2772
February	1st to 10th	Day	55% 5% 11% 16% 10% 3	1699
	11th to 20th	Day	54% 6% 10% 16% 13% 1	1747
	21st to end	Day	51% 6% 9% 19% 10% 5%	1570
March	1st to 10th	Day	58% 5% 9% 12% 13% 3	3141
	11th to 20th	Day	56% 8% 12% 11% 10% 2	3480
	21st to end	Day	57% 4 6% 16% 14% 3	3816
April	1st to 10th	Day	56% 4 11% 15% 11% 3	2266
	11th to 20th	Day	49% 6% 10% 20% 15% 1	2435
	21st to end	Day	52% 5% 8% 18% 12% 4	2470
May	1st to 10th	Day	50% 7% 11% 20% 10% 2	4120
	11th to 20th	Day	50% 8% 16% 17% 7% 1	4138
	21st to end	Day	45% 10% 13% 16% 15% 1	5141
June	1st to 10th	Day	53% 7% 13% 17% 9% 1	2850
	11th to 20th	Day	47% 6% 12% 21% 13% 2	2850
	21st to end	Day	55% 8% 11% 16% 9% 1	2850
July	1st to 10th	Day	43% 8% 15% 22% 11%	4668
	11th to 20th	Day	43% 7% 13% 28% 9%	4365
	21st to end	Day	45% 7% 12% 27% 9% 1	4661
August	1st to 10th	Day	47% 8% 15% 24% 6%	4092
	11th to 20th	Day	48% 8% 17% 20% 6%	4084
	21st to end	Day	40% 7% 14% 25% 14% 1	4532
September	1st to 10th	Day	36% 7% 14% 26% 16% 1	2210
	11th to 20th	Day	37% 5% 12% 29% 16% 2	2090
	21st to end	Day	42% 5% 11% 28% 14% 1	2090
October	1st to 10th	Day	52% 5% 12% 22% 8%	3363
	11th to 20th	Day	46% 6% 11% 29% 8%	3085
	21st to end	Day	41% 5% 16% 21% 17%	3081
November	1st to 10th	Day	50% 6% 13% 18% 12% 1	1761
	11th to 20th	Day	50% 6% 12% 18% 12% 2	1694
	21st to end	Day	52% 6% 15% 19% 7% 1	1600
December	1st to 10th	Day	59% 6% 11% 16% 8%	1425
	11th to 20th	Day	53% 6% 11% 16% 13% 2	1738
	21st to end	Day	54% 6% 12% 16% 8% 4	2452
January	1st to 10th	Night	52% 8% 14% 18% 8% 1	4525
	11th to 20th	Night	51% 9% 12% 20% 8% 1	4440
	21st to end	Night	52% 8% 11% 16% 11% 1	4884
February	1st to 10th	Night	53% 6% 11% 18% 11% 2	2480
	11th to 20th	Night	52% 6% 12% 17% 12% 2	2328
	21st to end	Night	50% 5% 9% 20% 13% 3	1884
March	1st to 10th	Night	58% 6% 9% 17% 8% 3	3712
	11th to 20th	Night	56% 8% 14% 13% 8% 2	3480
	21st to end	Night	55% 6% 8% 18% 11% 2	3816
April	1st to 10th	Night	55% 5% 7% 14% 16% 4	1911
	11th to 20th	Night	47% 5% 10% 20% 15% 3	1693
	21st to end	Night	53% 6% 10% 16% 13% 3	1710
May	1st to 10th	Night	46% 8% 14% 21% 10% 1	2840
	11th to 20th	Night	52% 11% 14% 16% 6% 1	2790
	21st to end	Night	38% 10% 18% 20% 13% 1	2445
June	1st to 10th	Night	52% 8% 12% 20% 8% 1	1330
	11th to 20th	Night	45% 6% 14% 21% 12% 2	1330
	21st to end	Night	53% 6% 13% 17% 9% 1	1330
July	1st to 10th	Night	39% 7% 20% 23% 11%	2175
	11th to 20th	Night	43% 6% 15% 28% 8%	2472
	21st to end	Night	41% 8% 15% 26% 10%	2651
August	1st to 10th	Night	52% 6% 14% 22% 5%	2782
	11th to 20th	Night	45% 9% 17% 20% 9%	2809
	21st to end	Night	38% 6% 15% 23% 17% 1	3124
September	1st to 10th	Night	33% 7% 16% 31% 13% 1	1966
	11th to 20th	Night	35% 6% 13% 29% 16% 1	2090
	21st to end	Night	41% 7% 10% 26% 15% 1	2090
October	1st to 10th	Night	48% 5% 11% 24% 12%	3596
	11th to 20th	Night	41% 5% 11% 30% 12%	3831
	21st to end	Night	41% 5% 17% 22% 14% 1	4467
November	1st to 10th	Night	46% 7% 14% 22% 10% 1	2537
	11th to 20th	Night	49% 6% 12% 19% 12% 2	2705
	21st to end	Night	51% 7% 15% 16% 10% 1	2800
December	1st to 10th	Night	57% 6% 11% 19% 7%	2970
	11th to 20th	Night	53% 5% 11% 16% 14% 1	3682
	21st to end	Night	53% 6% 11% 19% 10% 2	5288

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	30% 23% 27% 18% 2	180
	11th to 20th	Day	32% 22% 31% 13% 3 1	180
	21st to end	Day	19% 20% 38% 15% 8%	198
February	1st to 10th	Day	24% 20% 32% 20% 3 1	359
	11th to 20th	Day	26% 25% 32% 14% 3	402
	21st to end	Day	25% 22% 32% 18% 2	382
March	1st to 10th	Day	29% 21% 33% 14% 3	460
	11th to 20th	Day	24% 22% 31% 17% 6% 1	460
	21st to end	Day	30% 19% 28% 15% 6% 2	506
April	1st to 10th	Day	34% 18% 27% 13% 5% 1	460
	11th to 20th	Day	30% 21% 29% 12% 7% 1	452
	21st to end	Day	32% 19% 31% 12% 4 2	460
May	1st to 10th	Day	30% 17% 31% 17% 4 2	463
	11th to 20th	Day	26% 18% 31% 17% 7% 1	487
	21st to end	Day	20% 20% 33% 20% 6%	703
June	1st to 10th	Day	26% 16% 29% 18% 9% 1	680
	11th to 20th	Day	23% 13% 28% 22% 12% 1	680
	21st to end	Day	27% 11% 30% 21% 10% 1	680
July	1st to 10th	Day	18% 11% 33% 26% 10% 2	666
	11th to 20th	Day	17% 9% 40% 21% 11% 2	484
	21st to end	Day	16% 9% 35% 28% 9% 3	532
August	1st to 10th	Day	18% 9% 30% 29% 11% 2	486
	11th to 20th	Day	16% 11% 28% 28% 13% 3	479
	21st to end	Day	19% 12% 27% 24% 16% 3	539
September	1st to 10th	Day	15% 14% 29% 27% 13% 3	490
	11th to 20th	Day	19% 10% 29% 21% 16% 5%	490
	21st to end	Day	19% 15% 29% 21% 11% 6%	490
October	1st to 10th	Day	19% 16% 27% 21% 13% 5%	455
	11th to 20th	Day	27% 17% 30% 16% 8% 2	390
	21st to end	Day	31% 18% 26% 22% 4	429
November	1st to 10th	Day	30% 15% 27% 21% 7% 1	395
	11th to 20th	Day	28% 19% 31% 15% 6% 1	400
	21st to end	Day	29% 23% 27% 16% 5% 1	400
December	1st to 10th	Day	28% 15% 32% 20% 5%	225
	11th to 20th	Day	34% 24% 28% 12% 3 1	200
	21st to end	Day	32% 25% 23% 17% 4	204
January	1st to 10th	Night	23% 17% 35% 22% 4	787
	11th to 20th	Night	24% 19% 33% 20% 3	760
	21st to end	Night	16% 19% 37% 23% 5%	836
February	1st to 10th	Night	21% 18% 36% 22% 3	760
	11th to 20th	Night	22% 21% 38% 17% 3	743
	21st to end	Night	23% 17% 34% 24% 3	628
March	1st to 10th	Night	23% 16% 36% 22% 2	760
	11th to 20th	Night	22% 16% 34% 21% 7%	760
	21st to end	Night	23% 16% 33% 21% 6%	836
April	1st to 10th	Night	30% 14% 35% 18% 4	760
	11th to 20th	Night	23% 15% 34% 21% 6%	569
	21st to end	Night	32% 13% 29% 19% 6%	570
May	1st to 10th	Night	27% 9% 33% 26% 4 1	570
	11th to 20th	Night	24% 14% 30% 24% 7%	551
	21st to end	Night	22% 10% 35% 26% 7%	411
June	1st to 10th	Night	25% 7% 30% 29% 8% 1	380
	11th to 20th	Night	18% 8% 29% 35% 10%	380
	21st to end	Night	27% 7% 26% 33% 7%	380
July	1st to 10th	Night	18% 4 32% 36% 10% 1	370
	11th to 20th	Night	18% 5% 29% 36% 12%	368
	21st to end	Night	19% 6% 25% 38% 13%	416
August	1st to 10th	Night	18% 8% 24% 35% 15%	547
	11th to 20th	Night	17% 5% 25% 36% 16% 1	562
	21st to end	Night	15% 8% 26% 36% 15% 1	627
September	1st to 10th	Night	16% 8% 31% 30% 15% 1	740
	11th to 20th	Night	17% 9% 24% 32% 15% 2	760
	21st to end	Night	21% 8% 29% 27% 13% 1	760
October	1st to 10th	Night	22% 10% 27% 26% 12% 1	760
	11th to 20th	Night	23% 12% 30% 24% 11% 1	760
	21st to end	Night	29% 16% 28% 23% 5%	836
November	1st to 10th	Night	24% 14% 31% 23% 7%	780
	11th to 20th	Night	24% 16% 29% 21% 8% 1	853
	21st to end	Night	27% 17% 29% 23% 4	900
December	1st to 10th	Night	28% 12% 34% 21% 4 1	900
	11th to 20th	Night	26% 19% 30% 21% 3	900
	21st to end	Night	28% 15% 34% 19% 3	953

Page generated at 2024-12-21 04:13:51. Version ac07

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