Escanaba
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Escanaba clear sky chart from 2005-11-06 to 2026-04-02.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 36%	131162
	Night	14% 10% 4 9% 5% 4 5% 3 5% 7% 36%	130894
Transparency	Day	29% 39% 9% 15% 8% 1	134617
	Night	32% 37% 9% 14% 8% 1	135526
Seeing	Day	16% 10% 29% 30% 13% 3	17805
	Night	18% 8% 29% 30% 13% 1	27930

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	9% 13% 6% 13% 6% 4 4 4 5% 8% 28%	4691
	11th to 20th	Day	11% 14% 4 12% 6% 5% 6% 5% 6% 7% 24%	4679
	21st to end	Day	9% 11% 6% 13% 7% 5% 4 4 5% 6% 28%	5156
February	1st to 10th	Day	10% 11% 5% 12% 7% 5% 4 4 5% 6% 30%	1743
	11th to 20th	Day	11% 12% 4 10% 7% 6% 5% 3 5% 6% 30%	2036
	21st to end	Day	13% 12% 5% 12% 8% 6% 4 4 5% 7% 25%	1730
March	1st to 10th	Day	13% 9% 4 7% 5% 4 4 4 5% 7% 39%	4578
	11th to 20th	Day	11% 12% 4 12% 6% 5% 5% 4 5% 7% 29%	4795
	21st to end	Day	21% 13% 5% 11% 5% 5% 4 3 4 5% 24%	6044
April	1st to 10th	Day	16% 14% 5% 9% 5% 4 4 3 5% 7% 26%	2412
	11th to 20th	Day	18% 11% 4 8% 5% 5% 4 4 4 6% 31%	2418
	21st to end	Day	18% 9% 3 7% 5% 5% 5% 4 6% 7% 33%	2600
May	1st to 10th	Day	14% 7% 3 6% 4 4 4 3 4 6% 46%	5995
	11th to 20th	Day	13% 9% 3 7% 4 4 4 3 5% 7% 42%	6319
	21st to end	Day	12% 9% 3 7% 5% 4 5% 3 5% 7% 40%	6949
June	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 4 6% 9% 41%	2800
	11th to 20th	Day	14% 6% 3 7% 5% 4 5% 4 6% 8% 39%	2800
	21st to end	Day	14% 7% 2 6% 5% 4 4 5% 7% 9% 37%	2800
July	1st to 10th	Day	12% 5% 2 6% 4 5% 4 4 7% 9% 44%	6359
	11th to 20th	Day	8% 5% 2 4 4 4 4 4 6% 9% 50%	6360
	21st to end	Day	9% 4 2 6% 4 4 4 4 6% 8% 48%	6926
August	1st to 10th	Day	8% 6% 2 6% 6% 5% 6% 5% 6% 9% 40%	4563
	11th to 20th	Day	13% 6% 2 5% 4 3 4 4 5% 7% 48%	4187
	21st to end	Day	13% 6% 3 7% 4 4 4 4 5% 7% 44%	4345
September	1st to 10th	Day	13% 5% 2 6% 5% 4 4 4 6% 8% 42%	2400
	11th to 20th	Day	12% 5% 2 6% 3 4 5% 4 7% 9% 43%	2247
	21st to end	Day	12% 8% 2 8% 5% 4 4 4 6% 8% 38%	2200
October	1st to 10th	Day	16% 7% 2 6% 4 5% 4 3 7% 8% 37%	2165
	11th to 20th	Day	19% 11% 4 9% 5% 5% 5% 4 6% 6% 25%	1876
	21st to end	Day	19% 13% 4 8% 5% 5% 5% 5% 6% 6% 26%	1980
November	1st to 10th	Day	13% 12% 4 7% 4 5% 5% 4 6% 6% 34%	1852
	11th to 20th	Day	16% 12% 4 9% 6% 5% 5% 4 6% 6% 27%	1890
	21st to end	Day	16% 14% 4 9% 6% 5% 5% 4 6% 8% 24%	1687
December	1st to 10th	Day	11% 14% 5% 12% 7% 7% 7% 5% 7% 6% 20%	2533
	11th to 20th	Day	14% 17% 5% 13% 5% 6% 5% 4 4 5% 22%	2977
	21st to end	Day	24% 21% 6% 12% 5% 3 4 3 3 4 16%	4070
January	1st to 10th	Night	12% 13% 5% 12% 5% 5% 4 3 5% 6% 29%	8233
	11th to 20th	Night	8% 15% 6% 17% 8% 6% 6% 4 4 5% 20%	8236
	21st to end	Night	8% 11% 5% 11% 6% 5% 5% 4 6% 7% 33%	9058
February	1st to 10th	Night	11% 13% 4 9% 6% 4 6% 5% 5% 8% 30%	2873
	11th to 20th	Night	11% 11% 3 10% 6% 6% 5% 4 6% 6% 32%	2469
	21st to end	Night	13% 14% 4 10% 5% 6% 5% 4 5% 7% 29%	2076
March	1st to 10th	Night	14% 8% 3 8% 4 4 4 3 5% 7% 41%	5482
	11th to 20th	Night	12% 11% 4 7% 4 5% 5% 4 6% 8% 32%	5383
	21st to end	Night	21% 10% 4 7% 5% 4 5% 4 5% 6% 29%	5171
April	1st to 10th	Night	18% 13% 3 8% 5% 4 4 4 5% 6% 30%	2010
	11th to 20th	Night	21% 9% 2 6% 5% 4 4 4 5% 5% 35%	1931
	21st to end	Night	17% 9% 3 6% 5% 4 5% 4 5% 7% 37%	1800
May	1st to 10th	Night	16% 7% 2 6% 3 3 4 2 5% 6% 46%	3948
	11th to 20th	Night	14% 10% 3 8% 4 5% 4 3 4 5% 40%	3596
	21st to end	Night	18% 7% 2 5% 4 4 4 4 5% 6% 42%	3949
June	1st to 10th	Night	13% 5% 2 6% 4 4 5% 4 5% 7% 45%	1600
	11th to 20th	Night	15% 6% 3 6% 4 4 5% 4 6% 8% 38%	1600
	21st to end	Night	16% 6% 2 5% 4 3 4 3 6% 7% 44%	1600
July	1st to 10th	Night	12% 5% 2 5% 4 4 4 4 6% 8% 47%	3620
	11th to 20th	Night	8% 3 2 5% 3 3 3 3 5% 8% 57%	3620
	21st to end	Night	7% 4 2 5% 4 4 4 3 5% 8% 54%	3948
August	1st to 10th	Night	11% 4 2 6% 4 4 5% 3 4 8% 46%	2597
	11th to 20th	Night	13% 5% 2 5% 3 4 4 3 5% 7% 51%	2861
	21st to end	Night	12% 6% 2 6% 4 4 4 3 5% 6% 50%	3549
September	1st to 10th	Night	10% 6% 2 6% 4 4 4 3 5% 6% 52%	2000
	11th to 20th	Night	12% 6% 2 5% 4 3 5% 3 5% 7% 49%	2132
	21st to end	Night	15% 7% 3 8% 4 4 3 3 5% 7% 42%	2200
October	1st to 10th	Night	15% 7% 3 7% 4 4 4 3 5% 7% 41%	2233
	11th to 20th	Night	17% 9% 3 6% 6% 4 5% 4 5% 6% 35%	2523
	21st to end	Night	20% 11% 3 6% 4 4 5% 4 5% 7% 32%	2860
November	1st to 10th	Night	15% 10% 3 8% 4 4 5% 3 6% 7% 35%	2666
	11th to 20th	Night	16% 12% 3 8% 6% 5% 5% 4 5% 5% 31%	2730
	21st to end	Night	16% 12% 4 8% 5% 5% 5% 3 5% 7% 29%	2930
December	1st to 10th	Night	14% 11% 4 9% 5% 5% 5% 4 6% 8% 30%	4844
	11th to 20th	Night	13% 14% 5% 13% 6% 5% 5% 4 4 5% 26%	5416
	21st to end	Night	25% 16% 6% 11% 4 3 4 2 4 5% 21%	7150

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	42% 24% 15% 14% 5%	4692
	11th to 20th	Day	46% 26% 8% 14% 5%	4710
	21st to end	Day	40% 25% 9% 13% 12%	5156
February	1st to 10th	Day	19% 61% 6% 9% 4	1743
	11th to 20th	Day	23% 59% 5% 8% 5%	2046
	21st to end	Day	21% 60% 4 9% 6%	1730
March	1st to 10th	Day	29% 30% 14% 12% 13% 3	4580
	11th to 20th	Day	40% 30% 11% 12% 6% 1	4795
	21st to end	Day	44% 31% 7% 10% 7%	6044
April	1st to 10th	Day	22% 63% 3 8% 4	2412
	11th to 20th	Day	20% 62% 3 8% 5% 1	2418
	21st to end	Day	17% 63% 4 8% 7% 1	2600
May	1st to 10th	Day	25% 30% 8% 21% 15% 1	6004
	11th to 20th	Day	30% 32% 8% 20% 10% 1	6323
	21st to end	Day	30% 30% 8% 15% 13% 3	6949
June	1st to 10th	Day	14% 63% 5% 11% 6% 1	2800
	11th to 20th	Day	19% 63% 6% 7% 5% 1	2800
	21st to end	Day	15% 62% 7% 10% 5%	2800
July	1st to 10th	Day	27% 29% 12% 23% 9%	6291
	11th to 20th	Day	21% 29% 12% 29% 8%	6285
	21st to end	Day	23% 28% 11% 26% 12%	6728
August	1st to 10th	Day	23% 39% 12% 18% 7%	4548
	11th to 20th	Day	24% 38% 11% 20% 7%	4226
	21st to end	Day	25% 39% 10% 19% 7%	4344
September	1st to 10th	Day	19% 59% 8% 10% 4	2400
	11th to 20th	Day	15% 60% 8% 12% 5%	2247
	21st to end	Day	16% 59% 8% 13% 5%	2200
October	1st to 10th	Day	17% 37% 9% 21% 16%	3529
	11th to 20th	Day	31% 37% 6% 19% 7%	3027
	21st to end	Day	34% 38% 11% 13% 4	3180
November	1st to 10th	Day	23% 55% 6% 10% 4 1	1852
	11th to 20th	Day	25% 55% 7% 9% 4 1	1890
	21st to end	Day	28% 56% 6% 7% 3	1687
December	1st to 10th	Day	42% 39% 10% 8% 3	2533
	11th to 20th	Day	44% 33% 9% 8% 6%	2978
	21st to end	Day	56% 28% 3 8% 4	4070
January	1st to 10th	Night	45% 23% 9% 15% 7%	8233
	11th to 20th	Night	54% 24% 7% 8% 7%	8280
	21st to end	Night	38% 25% 10% 16% 11%	9058
February	1st to 10th	Night	23% 59% 5% 9% 5%	2873
	11th to 20th	Night	20% 58% 5% 11% 5% 1	2470
	21st to end	Night	20% 60% 5% 10% 5%	2076
March	1st to 10th	Night	30% 29% 15% 16% 10%	5493
	11th to 20th	Night	37% 30% 13% 13% 6%	5384
	21st to end	Night	40% 30% 9% 13% 7%	5171
April	1st to 10th	Night	23% 62% 2 7% 5% 1	2010
	11th to 20th	Night	21% 63% 3 8% 4 2	1931
	21st to end	Night	19% 62% 4 8% 6% 1	1800
May	1st to 10th	Night	26% 30% 8% 22% 13% 2	3955
	11th to 20th	Night	31% 32% 6% 18% 11% 1	3597
	21st to end	Night	32% 30% 7% 19% 7% 5%	3950
June	1st to 10th	Night	14% 63% 4 12% 7%	1600
	11th to 20th	Night	20% 63% 4 7% 5% 1	1600
	21st to end	Night	16% 60% 3 13% 7% 1	1600
July	1st to 10th	Night	29% 28% 12% 21% 9% 2	3580
	11th to 20th	Night	19% 27% 15% 29% 9% 1	3572
	21st to end	Night	21% 27% 12% 21% 19% 1	3832
August	1st to 10th	Night	24% 38% 11% 16% 11% 1	2588
	11th to 20th	Night	24% 38% 10% 21% 6%	2888
	21st to end	Night	23% 38% 10% 17% 11% 1	3549
September	1st to 10th	Night	17% 58% 7% 12% 5%	2000
	11th to 20th	Night	16% 59% 6% 13% 6%	2132
	21st to end	Night	17% 58% 8% 11% 6%	2200
October	1st to 10th	Night	22% 37% 6% 25% 10%	3649
	11th to 20th	Night	25% 37% 9% 18% 12%	4111
	21st to end	Night	32% 36% 10% 16% 6%	4610
November	1st to 10th	Night	25% 54% 6% 12% 4	2666
	11th to 20th	Night	22% 56% 7% 10% 5% 1	2730
	21st to end	Night	27% 55% 6% 8% 3 1	2930
December	1st to 10th	Night	35% 37% 14% 11% 3	4844
	11th to 20th	Night	42% 33% 8% 10% 8%	5414
	21st to end	Night	51% 29% 6% 8% 6%	7150

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	14% 11% 39% 24% 11% 1	330
	11th to 20th	Day	18% 12% 36% 26% 7% 1	330
	21st to end	Day	20% 5% 37% 31% 7% 1	363
February	1st to 10th	Day	12% 13% 43% 23% 8% 1	330
	11th to 20th	Day	14% 16% 42% 22% 6%	330
	21st to end	Day	18% 21% 37% 22% 3	273
March	1st to 10th	Day	16% 16% 37% 26% 5%	330
	11th to 20th	Day	17% 16% 33% 25% 7% 1	401
	21st to end	Day	23% 13% 28% 26% 9% 1	594
April	1st to 10th	Day	20% 13% 34% 25% 8% 1	504
	11th to 20th	Day	20% 15% 29% 26% 9% 2	492
	21st to end	Day	20% 12% 28% 28% 11% 1	500
May	1st to 10th	Day	19% 9% 34% 25% 11% 1	545
	11th to 20th	Day	17% 7% 32% 31% 12% 2	725
	21st to end	Day	14% 7% 28% 32% 15% 3	789
June	1st to 10th	Day	11% 7% 31% 36% 12% 2	730
	11th to 20th	Day	17% 7% 27% 35% 13% 2	730
	21st to end	Day	15% 5% 26% 37% 15% 2	730
July	1st to 10th	Day	9% 4 22% 41% 21% 3	721
	11th to 20th	Day	8% 5% 21% 41% 20% 4	718
	21st to end	Day	9% 4 23% 37% 23% 6%	794
August	1st to 10th	Day	8% 4 19% 41% 23% 6%	726
	11th to 20th	Day	12% 5% 15% 34% 26% 8%	532
	21st to end	Day	13% 8% 23% 29% 21% 7%	583
September	1st to 10th	Day	15% 7% 25% 30% 15% 8%	530
	11th to 20th	Day	11% 5% 23% 36% 19% 6%	530
	21st to end	Day	13% 11% 22% 29% 20% 4	530
October	1st to 10th	Day	18% 10% 30% 23% 14% 4	495
	11th to 20th	Day	20% 17% 32% 26% 5%	330
	21st to end	Day	24% 14% 36% 19% 6% 1	363
November	1st to 10th	Day	14% 17% 37% 23% 8%	330
	11th to 20th	Day	20% 22% 31% 18% 6% 2	330
	21st to end	Day	22% 18% 38% 19% 4	330
December	1st to 10th	Day	20% 15% 37% 19% 8% 1	280
	11th to 20th	Day	21% 23% 35% 16% 5% 1	294
	21st to end	Day	30% 15% 32% 18% 4 1	363
January	1st to 10th	Night	18% 10% 36% 29% 7% 1	1050
	11th to 20th	Night	19% 10% 37% 25% 9%	1050
	21st to end	Night	17% 6% 35% 31% 10% 1	1155
February	1st to 10th	Night	16% 7% 37% 30% 8% 1	1050
	11th to 20th	Night	17% 10% 36% 30% 7% 1	834
	21st to end	Night	19% 8% 36% 32% 6%	692
March	1st to 10th	Night	17% 6% 36% 31% 8% 1	840
	11th to 20th	Night	18% 7% 39% 28% 7% 1	840
	21st to end	Night	19% 5% 32% 34% 9% 1	740
April	1st to 10th	Night	22% 9% 31% 30% 7% 1	603
	11th to 20th	Night	23% 7% 26% 32% 11% 1	593
	21st to end	Night	19% 5% 28% 36% 11% 1	600
May	1st to 10th	Night	19% 6% 27% 33% 13% 1	600
	11th to 20th	Night	20% 3 25% 37% 13% 2	591
	21st to end	Night	15% 4 21% 38% 20% 3	650
June	1st to 10th	Night	14% 4 20% 43% 19% 1	600
	11th to 20th	Night	17% 4 22% 37% 18% 3	600
	21st to end	Night	17% 3 19% 40% 18% 2	600
July	1st to 10th	Night	8% 2 14% 44% 29% 3	585
	11th to 20th	Night	10% 2 20% 37% 28% 3	582
	21st to end	Night	10% 3 18% 40% 27% 4	657
August	1st to 10th	Night	8% 3 15% 40% 31% 4	597
	11th to 20th	Night	10% 2 16% 36% 30% 5%	594
	21st to end	Night	13% 3 21% 37% 25% 1	660
September	1st to 10th	Night	11% 6% 23% 32% 24% 5%	600
	11th to 20th	Night	14% 4 23% 32% 21% 5%	732
	21st to end	Night	15% 7% 23% 30% 22% 3	800
October	1st to 10th	Night	19% 9% 29% 27% 15% 2	800
	11th to 20th	Night	23% 11% 31% 26% 9%	800
	21st to end	Night	25% 13% 28% 26% 8%	880
November	1st to 10th	Night	21% 13% 33% 27% 6%	820
	11th to 20th	Night	22% 17% 32% 21% 6% 1	840
	21st to end	Night	23% 18% 32% 21% 6%	1040
December	1st to 10th	Night	20% 17% 35% 21% 7% 1	1050
	11th to 20th	Night	22% 15% 34% 22% 7% 1	1050
	21st to end	Night	27% 11% 34% 23% 5%	1155

Page generated at 2026-03-30 02:18:40. Version ac07

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