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 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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 35%	101818
	Night	14% 10% 4 8% 5% 4 5% 3 5% 6% 36%	98401
Transparency	Day	24% 48% 8% 13% 7%	105290
	Night	26% 47% 7% 12% 6% 1	103017
Seeing	Day	16% 10% 29% 30% 13% 3	16106
	Night	18% 8% 29% 30% 13% 1	26131

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	12% 13% 7% 12% 6% 5% 5% 4 5% 6% 25%	2527
	11th to 20th	Day	13% 13% 4 12% 7% 5% 6% 4 7% 7% 22%	2530
	21st to end	Day	13% 16% 9% 13% 7% 6% 4 3 5% 5% 20%	2783
February	1st to 10th	Day	10% 11% 4 12% 7% 6% 4 5% 5% 7% 29%	1577
	11th to 20th	Day	10% 13% 4 9% 7% 7% 5% 3 5% 6% 30%	1836
	21st to end	Day	13% 11% 5% 12% 7% 6% 4 4 5% 7% 26%	1570
March	1st to 10th	Day	12% 11% 4 8% 4 4 4 4 5% 7% 37%	3118
	11th to 20th	Day	8% 12% 5% 14% 7% 4 4 4 5% 6% 31%	3276
	21st to end	Day	18% 12% 5% 12% 6% 6% 4 3 5% 5% 23%	4123
April	1st to 10th	Day	17% 14% 5% 9% 5% 4 4 3 5% 7% 27%	2280
	11th to 20th	Day	19% 10% 4 8% 5% 5% 4 4 4 6% 31%	2296
	21st to end	Day	18% 9% 3 7% 5% 4 5% 4 5% 7% 33%	2470
May	1st to 10th	Day	14% 7% 3 7% 5% 4 4 3 5% 7% 40%	4187
	11th to 20th	Day	13% 6% 2 7% 5% 5% 4 3 5% 7% 42%	4399
	21st to end	Day	12% 7% 3 7% 5% 4 5% 4 6% 8% 40%	4837
June	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 4 6% 9% 41%	2660
	11th to 20th	Day	13% 6% 3 7% 5% 4 5% 4 6% 8% 40%	2660
	21st to end	Day	13% 7% 2 6% 5% 4 4 5% 7% 9% 38%	2660
July	1st to 10th	Day	15% 5% 2 7% 4 5% 4 4 7% 9% 38%	4440
	11th to 20th	Day	5% 4 1 4 5% 4 5% 4 7% 10% 50%	4440
	21st to end	Day	9% 4 2 6% 4 4 4 4 6% 7% 48%	4814
August	1st to 10th	Day	8% 6% 2 6% 6% 5% 6% 5% 6% 9% 40%	4423
	11th to 20th	Day	13% 6% 2 5% 4 3 4 4 5% 7% 49%	4057
	21st to end	Day	13% 6% 3 7% 4 4 4 3 5% 6% 44%	4212
September	1st to 10th	Day	13% 5% 2 6% 5% 4 4 3 6% 8% 43%	2280
	11th to 20th	Day	12% 5% 2 5% 3 4 5% 4 7% 9% 43%	2135
	21st to end	Day	13% 8% 2 8% 5% 4 4 4 6% 8% 38%	2090
October	1st to 10th	Day	17% 7% 3 6% 5% 4 4 3 7% 8% 37%	2057
	11th to 20th	Day	20% 11% 4 9% 5% 5% 5% 4 6% 6% 25%	1782
	21st to end	Day	20% 13% 4 8% 5% 5% 5% 4 6% 6% 24%	1881
November	1st to 10th	Day	14% 12% 4 7% 4 5% 4 4 6% 6% 34%	1762
	11th to 20th	Day	16% 12% 4 9% 6% 5% 5% 4 6% 6% 27%	1800
	21st to end	Day	16% 13% 4 8% 6% 5% 5% 4 6% 8% 24%	1607
December	1st to 10th	Day	14% 11% 4 10% 7% 6% 6% 4 7% 6% 24%	1513
	11th to 20th	Day	17% 16% 5% 11% 5% 5% 5% 4 4 5% 23%	1929
	21st to end	Day	24% 22% 6% 10% 4 3 4 3 3 4 16%	2807
January	1st to 10th	Night	15% 16% 6% 11% 4 4 4 3 5% 5% 29%	4428
	11th to 20th	Night	10% 15% 6% 13% 8% 6% 6% 4 4 6% 23%	4440
	21st to end	Night	14% 16% 7% 10% 6% 5% 5% 3 5% 6% 23%	4884
February	1st to 10th	Night	10% 13% 4 9% 6% 4 6% 5% 5% 8% 30%	2600
	11th to 20th	Night	10% 11% 3 10% 6% 6% 5% 4 6% 7% 32%	2229
	21st to end	Night	13% 14% 4 10% 5% 6% 5% 4 5% 6% 29%	1884
March	1st to 10th	Night	13% 10% 4 7% 4 3 3 3 5% 7% 42%	3722
	11th to 20th	Night	9% 11% 5% 8% 4 6% 5% 4 5% 7% 36%	3682
	21st to end	Night	17% 10% 4 8% 5% 5% 6% 4 5% 6% 29%	3535
April	1st to 10th	Night	18% 13% 3 8% 5% 4 4 4 5% 7% 29%	1900
	11th to 20th	Night	20% 9% 2 6% 5% 4 4 3 5% 5% 35%	1833
	21st to end	Night	17% 9% 3 6% 5% 4 5% 4 5% 7% 36%	1710
May	1st to 10th	Night	18% 7% 2 6% 4 3 5% 3 5% 6% 41%	2754
	11th to 20th	Night	14% 8% 3 9% 5% 5% 4 4 4 6% 39%	2506
	21st to end	Night	19% 6% 2 5% 4 4 5% 4 5% 6% 39%	2750
June	1st to 10th	Night	13% 5% 2 6% 4 4 5% 4 5% 7% 45%	1520
	11th to 20th	Night	15% 6% 3 6% 4 4 5% 4 6% 8% 39%	1520
	21st to end	Night	15% 6% 2 5% 3 3 4 3 7% 7% 44%	1520
July	1st to 10th	Night	13% 4 2 6% 4 5% 5% 4 6% 8% 42%	2530
	11th to 20th	Night	6% 3 2 4 3 3 3 4 5% 9% 58%	2530
	21st to end	Night	8% 5% 2 5% 4 4 4 3 5% 8% 54%	2750
August	1st to 10th	Night	11% 4 3 6% 4 4 5% 3 4 8% 46%	2517
	11th to 20th	Night	13% 5% 2 5% 3 4 4 3 5% 7% 52%	2772
	21st to end	Night	12% 6% 2 6% 4 4 4 3 5% 6% 49%	3440
September	1st to 10th	Night	9% 5% 2 6% 4 3 4 3 5% 6% 53%	1900
	11th to 20th	Night	12% 6% 2 5% 4 3 5% 3 5% 7% 49%	2025
	21st to end	Night	15% 7% 3 8% 4 4 3 3 5% 7% 41%	2090
October	1st to 10th	Night	16% 7% 3 7% 4 4 4 3 5% 7% 41%	2121
	11th to 20th	Night	16% 9% 3 6% 6% 4 5% 4 5% 6% 35%	2397
	21st to end	Night	21% 11% 3 6% 4 4 5% 4 5% 7% 30%	2717
November	1st to 10th	Night	14% 9% 3 8% 5% 4 5% 3 6% 7% 36%	2536
	11th to 20th	Night	16% 12% 3 8% 6% 5% 5% 4 5% 5% 30%	2600
	21st to end	Night	16% 12% 4 8% 5% 6% 5% 3 5% 7% 29%	2790
December	1st to 10th	Night	13% 13% 5% 9% 6% 5% 5% 4 6% 7% 28%	2868
	11th to 20th	Night	13% 15% 5% 12% 5% 5% 5% 4 5% 5% 27%	3468
	21st to end	Night	25% 19% 7% 10% 4 3 4 2 3 4 18%	4933

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	36% 39% 12% 9% 3	2528
	11th to 20th	Day	38% 44% 8% 7% 3	2530
	21st to end	Day	43% 42% 9% 4 2	2783
February	1st to 10th	Day	17% 66% 5% 7% 4	1577
	11th to 20th	Day	19% 66% 5% 5% 4	1846
	21st to end	Day	17% 66% 4 8% 5%	1570
March	1st to 10th	Day	23% 43% 9% 13% 11%	3120
	11th to 20th	Day	32% 41% 10% 11% 5% 1	3276
	21st to end	Day	35% 43% 7% 9% 5%	4123
April	1st to 10th	Day	20% 66% 3 7% 3	2280
	11th to 20th	Day	19% 65% 2 7% 5% 1	2296
	21st to end	Day	15% 66% 4 8% 6% 1	2470
May	1st to 10th	Day	23% 41% 7% 17% 11% 1	4199
	11th to 20th	Day	23% 42% 7% 20% 7%	4403
	21st to end	Day	25% 42% 8% 11% 11% 3	4837
June	1st to 10th	Day	12% 66% 5% 10% 5% 1	2660
	11th to 20th	Day	16% 66% 5% 7% 6% 1	2660
	21st to end	Day	13% 65% 7% 10% 4	2660
July	1st to 10th	Day	28% 38% 11% 14% 7% 1	4371
	11th to 20th	Day	15% 39% 10% 27% 9%	4365
	21st to end	Day	18% 37% 8% 24% 12%	4662
August	1st to 10th	Day	23% 40% 11% 18% 7%	4408
	11th to 20th	Day	23% 39% 10% 20% 7%	4096
	21st to end	Day	25% 40% 10% 18% 7%	4211
September	1st to 10th	Day	17% 62% 7% 10% 4	2280
	11th to 20th	Day	13% 62% 8% 11% 5%	2135
	21st to end	Day	15% 62% 7% 12% 3	2090
October	1st to 10th	Day	17% 38% 8% 21% 16%	3421
	11th to 20th	Day	30% 39% 6% 19% 7%	2933
	21st to end	Day	34% 39% 11% 12% 4	3081
November	1st to 10th	Day	22% 58% 6% 10% 4	1762
	11th to 20th	Day	24% 57% 7% 8% 4 1	1800
	21st to end	Day	26% 58% 6% 6% 3	1607
December	1st to 10th	Day	25% 59% 6% 6% 3	1513
	11th to 20th	Day	34% 48% 6% 7% 5%	1930
	21st to end	Day	48% 38% 3 6% 4	2807
January	1st to 10th	Night	36% 39% 9% 13% 3	4428
	11th to 20th	Night	40% 42% 8% 8% 3	4440
	21st to end	Night	40% 43% 10% 5% 2	4884
February	1st to 10th	Night	19% 65% 4 7% 5%	2600
	11th to 20th	Night	17% 64% 4 11% 4 1	2230
	21st to end	Night	17% 65% 4 7% 6% 1	1884
March	1st to 10th	Night	24% 41% 13% 16% 5%	3733
	11th to 20th	Night	29% 42% 6% 17% 5%	3683
	21st to end	Night	33% 43% 7% 10% 7% 1	3535
April	1st to 10th	Night	20% 65% 2 6% 5% 1	1900
	11th to 20th	Night	19% 66% 3 7% 4 2	1833
	21st to end	Night	17% 65% 3 8% 6% 1	1710
May	1st to 10th	Night	25% 41% 6% 18% 9% 1	2761
	11th to 20th	Night	25% 42% 7% 18% 7%	2507
	21st to end	Night	29% 42% 7% 11% 5% 6%	2751
June	1st to 10th	Night	13% 66% 4 10% 6%	1520
	11th to 20th	Night	17% 66% 4 7% 6% 1	1520
	21st to end	Night	14% 63% 3 12% 7% 1	1520
July	1st to 10th	Night	31% 38% 9% 12% 7% 3	2490
	11th to 20th	Night	14% 37% 13% 27% 8% 1	2482
	21st to end	Night	20% 37% 8% 15% 20% 1	2662
August	1st to 10th	Night	24% 39% 10% 15% 11% 1	2508
	11th to 20th	Night	24% 39% 9% 22% 7%	2799
	21st to end	Night	23% 39% 10% 17% 11% 1	3440
September	1st to 10th	Night	16% 61% 6% 12% 5%	1900
	11th to 20th	Night	15% 61% 5% 13% 5%	2025
	21st to end	Night	16% 61% 7% 10% 5%	2090
October	1st to 10th	Night	21% 38% 6% 25% 10%	3537
	11th to 20th	Night	24% 38% 9% 17% 11%	3985
	21st to end	Night	32% 37% 10% 15% 6%	4467
November	1st to 10th	Night	23% 56% 6% 11% 4	2536
	11th to 20th	Night	22% 58% 7% 9% 4	2600
	21st to end	Night	26% 58% 6% 7% 2 1	2790
December	1st to 10th	Night	24% 58% 6% 9% 2	2868
	11th to 20th	Night	31% 49% 7% 9% 4	3466
	21st to end	Night	48% 39% 4 6% 3	4933

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	15% 11% 40% 21% 12% 1	270
	11th to 20th	Day	19% 12% 36% 25% 8%	270
	21st to end	Day	23% 4 35% 30% 8%	297
February	1st to 10th	Day	12% 11% 43% 24% 9% 1	270
	11th to 20th	Day	11% 17% 42% 22% 7%	270
	21st to end	Day	17% 17% 41% 22% 2	225
March	1st to 10th	Day	14% 16% 37% 27% 6%	270
	11th to 20th	Day	14% 15% 34% 26% 9% 1	334
	21st to end	Day	20% 12% 28% 28% 10% 1	506
April	1st to 10th	Day	21% 12% 35% 25% 8% 1	460
	11th to 20th	Day	21% 14% 28% 26% 10% 2	452
	21st to end	Day	20% 12% 27% 28% 11% 2	460
May	1st to 10th	Day	20% 9% 34% 24% 11% 2	503
	11th to 20th	Day	18% 6% 31% 31% 12% 2	675
	21st to end	Day	13% 6% 29% 33% 16% 3	734
June	1st to 10th	Day	11% 7% 31% 36% 12% 2	680
	11th to 20th	Day	16% 7% 27% 34% 14% 2	680
	21st to end	Day	15% 4 26% 37% 16% 2	680
July	1st to 10th	Day	9% 4 23% 41% 20% 4	671
	11th to 20th	Day	8% 6% 21% 40% 21% 4	668
	21st to end	Day	9% 4 22% 36% 23% 6%	739
August	1st to 10th	Day	8% 4 20% 41% 22% 6%	676
	11th to 20th	Day	12% 5% 14% 35% 27% 8%	492
	21st to end	Day	13% 8% 23% 29% 21% 6%	539
September	1st to 10th	Day	16% 7% 24% 31% 15% 7%	490
	11th to 20th	Day	12% 4 24% 37% 18% 5%	490
	21st to end	Day	14% 12% 22% 29% 18% 4	490
October	1st to 10th	Day	18% 11% 30% 23% 14% 4	457
	11th to 20th	Day	21% 17% 32% 24% 5%	300
	21st to end	Day	26% 15% 37% 18% 3 1	330
November	1st to 10th	Day	15% 16% 37% 23% 9%	300
	11th to 20th	Day	20% 22% 33% 19% 6% 1	300
	21st to end	Day	22% 18% 37% 19% 4	300
December	1st to 10th	Day	22% 13% 36% 20% 7% 2	255
	11th to 20th	Day	22% 21% 35% 16% 5% 1	267
	21st to end	Day	28% 17% 33% 18% 4	306
January	1st to 10th	Night	18% 10% 35% 28% 8% 1	950
	11th to 20th	Night	20% 10% 36% 25% 9%	950
	21st to end	Night	19% 6% 34% 30% 10% 1	1045
February	1st to 10th	Night	16% 6% 38% 30% 9% 1	950
	11th to 20th	Night	17% 10% 36% 30% 7% 1	754
	21st to end	Night	19% 8% 36% 31% 5%	628
March	1st to 10th	Night	17% 6% 36% 32% 9% 1	760
	11th to 20th	Night	16% 6% 40% 29% 8% 1	760
	21st to end	Night	19% 4 30% 36% 10% 1	670
April	1st to 10th	Night	21% 9% 30% 31% 7% 1	570
	11th to 20th	Night	23% 7% 26% 32% 11% 1	563
	21st to end	Night	19% 4 28% 36% 11% 1	570
May	1st to 10th	Night	20% 6% 28% 33% 13% 1	570
	11th to 20th	Night	20% 2 25% 37% 13% 2	561
	21st to end	Night	15% 3 20% 38% 20% 4	617
June	1st to 10th	Night	14% 4 20% 43% 19% 1	570
	11th to 20th	Night	16% 4 22% 37% 18% 3	570
	21st to end	Night	17% 2 18% 41% 19% 2	570
July	1st to 10th	Night	8% 2 14% 43% 29% 3	555
	11th to 20th	Night	9% 2 20% 36% 29% 3	552
	21st to end	Night	10% 3 17% 38% 28% 4	624
August	1st to 10th	Night	8% 3 16% 40% 29% 4	567
	11th to 20th	Night	10% 2 16% 35% 30% 6%	564
	21st to end	Night	14% 3 22% 37% 24% 1	627
September	1st to 10th	Night	11% 5% 23% 33% 24% 5%	570
	11th to 20th	Night	14% 5% 24% 32% 21% 4	695
	21st to end	Night	16% 7% 24% 29% 21% 3	760
October	1st to 10th	Night	20% 9% 29% 26% 14% 2	760
	11th to 20th	Night	22% 11% 31% 26% 9%	760
	21st to end	Night	26% 13% 29% 24% 7%	836
November	1st to 10th	Night	21% 13% 33% 27% 6%	780
	11th to 20th	Night	23% 17% 32% 21% 7% 1	800
	21st to end	Night	22% 18% 31% 21% 7%	990
December	1st to 10th	Night	19% 17% 35% 21% 7% 1	1000
	11th to 20th	Night	22% 14% 34% 22% 7% 1	1000
	21st to end	Night	26% 11% 34% 23% 5%	1063

Page generated at 2024-12-21 04:13:49. Version ac07

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