Oscoda
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oscoda clear sky chart from 2005-11-06 to 2024-11-04.

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% 8% 35%	101274
	Night	14% 10% 4 8% 5% 5% 5% 4 6% 7% 34%	97803
Transparency	Day	44% 9% 14% 20% 11% 1	104812
	Night	47% 8% 14% 21% 10% 1	102342
Seeing	Day	15% 8% 28% 30% 15% 4	15449
	Night	18% 8% 29% 30% 13% 2	24902

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	16% 13% 7% 11% 7% 4 5% 3 5% 6% 23%	2527
	11th to 20th	Day	13% 16% 5% 13% 8% 7% 6% 5% 6% 7% 13%	2530
	21st to end	Day	18% 17% 6% 12% 5% 4 5% 3 5% 6% 17%	2903
February	1st to 10th	Day	12% 15% 4 11% 7% 8% 6% 5% 5% 6% 22%	1710
	11th to 20th	Day	11% 12% 4 10% 8% 7% 6% 4 5% 6% 26%	1748
	21st to end	Day	13% 10% 3 9% 8% 6% 6% 5% 6% 6% 27%	1570
March	1st to 10th	Day	14% 12% 3 9% 5% 5% 5% 4 5% 7% 32%	3176
	11th to 20th	Day	11% 10% 5% 10% 6% 6% 6% 5% 6% 7% 28%	3480
	21st to end	Day	15% 10% 3 10% 7% 6% 6% 4 6% 7% 27%	3815
April	1st to 10th	Day	16% 12% 3 9% 5% 4 5% 4 5% 7% 30%	2228
	11th to 20th	Day	17% 9% 2 6% 4 4 5% 3 5% 8% 36%	2437
	21st to end	Day	15% 9% 3 7% 5% 4 5% 3 5% 7% 37%	2470
May	1st to 10th	Day	13% 9% 3 8% 6% 4 4 4 5% 7% 36%	4108
	11th to 20th	Day	14% 6% 3 7% 5% 5% 5% 4 5% 8% 39%	4081
	21st to end	Day	10% 6% 2 6% 4 5% 4 4 6% 7% 47%	4900
June	1st to 10th	Day	11% 6% 3 6% 5% 4 5% 4 8% 8% 41%	2850
	11th to 20th	Day	10% 5% 2 6% 4 5% 5% 4 7% 9% 43%	2850
	21st to end	Day	11% 6% 2 6% 4 4 5% 4 6% 9% 42%	2850
July	1st to 10th	Day	10% 5% 3 7% 5% 6% 6% 5% 7% 9% 37%	4614
	11th to 20th	Day	7% 5% 2 6% 4 5% 4 4 7% 10% 46%	4440
	21st to end	Day	7% 4 2 5% 4 5% 5% 5% 7% 10% 46%	4702
August	1st to 10th	Day	9% 4 2 5% 4 6% 6% 4 7% 9% 43%	4104
	11th to 20th	Day	10% 5% 2 6% 4 5% 4 4 7% 9% 43%	4044
	21st to end	Day	10% 5% 2 5% 5% 5% 5% 4 7% 10% 42%	4532
September	1st to 10th	Day	10% 6% 2 6% 5% 5% 5% 4 7% 10% 41%	2182
	11th to 20th	Day	11% 5% 2 5% 3 4 4 4 6% 10% 47%	2090
	21st to end	Day	14% 7% 2 7% 5% 4 5% 5% 6% 8% 36%	2090
October	1st to 10th	Day	14% 7% 2 7% 6% 3 6% 4 4 7% 39%	2019
	11th to 20th	Day	19% 11% 3 7% 5% 5% 5% 4 5% 7% 29%	1900
	21st to end	Day	20% 10% 3 9% 6% 6% 5% 4 7% 7% 23%	1895
November	1st to 10th	Day	13% 12% 2 8% 6% 6% 6% 3 6% 8% 29%	1699
	11th to 20th	Day	13% 12% 4 9% 7% 7% 6% 4 6% 7% 25%	1649
	21st to end	Day	18% 13% 5% 9% 6% 6% 5% 4 5% 6% 22%	1520
December	1st to 10th	Day	12% 14% 5% 11% 6% 7% 6% 4 7% 7% 20%	1459
	11th to 20th	Day	15% 16% 4 9% 5% 6% 5% 4 6% 7% 23%	1671
	21st to end	Day	25% 23% 7% 11% 6% 4 4 3 3 4 10%	2431
January	1st to 10th	Night	16% 13% 5% 11% 6% 5% 5% 4 5% 6% 24%	4428
	11th to 20th	Night	13% 15% 7% 13% 9% 6% 6% 4 5% 5% 16%	4440
	21st to end	Night	16% 17% 7% 11% 7% 6% 5% 4 5% 5% 17%	4757
February	1st to 10th	Night	11% 15% 5% 10% 7% 6% 5% 5% 7% 6% 23%	2470
	11th to 20th	Night	12% 14% 4 9% 6% 5% 4 4 5% 7% 29%	2316
	21st to end	Night	14% 14% 5% 11% 6% 5% 5% 4 5% 5% 26%	1884
March	1st to 10th	Night	12% 9% 3 8% 4 4 4 3 5% 6% 41%	3664
	11th to 20th	Night	9% 9% 4 8% 5% 4 4 4 6% 8% 39%	3479
	21st to end	Night	14% 10% 3 8% 5% 5% 4 4 5% 6% 35%	3817
April	1st to 10th	Night	17% 11% 3 7% 5% 3 4 4 4 7% 35%	1967
	11th to 20th	Night	17% 9% 3 7% 3 4 3 3 5% 8% 38%	1692
	21st to end	Night	17% 10% 2 9% 5% 4 4 3 5% 6% 35%	1710
May	1st to 10th	Night	12% 8% 3 9% 6% 5% 5% 3 6% 8% 36%	2833
	11th to 20th	Night	13% 7% 3 8% 5% 4 5% 3 5% 9% 39%	2812
	21st to end	Night	12% 6% 1 6% 4 4 4 4 6% 6% 47%	2675
June	1st to 10th	Night	12% 6% 2 6% 4 4 4 4 6% 7% 44%	1330
	11th to 20th	Night	9% 5% 2 7% 4 4 4 4 8% 9% 44%	1330
	21st to end	Night	9% 5% 3 6% 5% 4 5% 4 6% 7% 44%	1330
July	1st to 10th	Night	9% 6% 3 7% 5% 4 4 4 6% 8% 45%	2337
	11th to 20th	Night	7% 3 1 4 4 4 4 5% 7% 8% 51%	2530
	21st to end	Night	7% 4 2 5% 4 5% 5% 4 7% 8% 48%	2857
August	1st to 10th	Night	8% 6% 2 5% 4 4 4 4 7% 10% 47%	2825
	11th to 20th	Night	12% 5% 1 4 3 3 4 4 6% 10% 49%	2785
	21st to end	Night	8% 5% 2 6% 4 5% 5% 5% 6% 8% 48%	3124
September	1st to 10th	Night	8% 6% 2 6% 4 4 5% 4 6% 8% 47%	1975
	11th to 20th	Night	9% 5% 1 4 3 5% 4 3 6% 7% 52%	2090
	21st to end	Night	16% 6% 3 6% 4 4 4 3 6% 7% 40%	2090
October	1st to 10th	Night	15% 7% 2 5% 4 4 4 3 6% 7% 41%	2161
	11th to 20th	Night	19% 10% 3 8% 4 4 4 4 5% 6% 33%	2280
	21st to end	Night	21% 10% 4 8% 5% 4 4 3 5% 7% 30%	2698
November	1st to 10th	Night	12% 10% 3 8% 5% 4 4 4 5% 8% 37%	2452
	11th to 20th	Night	13% 13% 3 9% 7% 7% 5% 4 6% 7% 26%	2529
	21st to end	Night	18% 15% 3 9% 5% 4 5% 4 6% 7% 25%	2660
December	1st to 10th	Night	17% 13% 4 10% 6% 6% 5% 3 6% 6% 24%	2717
	11th to 20th	Night	14% 14% 5% 9% 6% 6% 6% 5% 6% 8% 20%	3526
	21st to end	Night	25% 23% 7% 11% 5% 4 3 2 4 4 11%	5233

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	61% 9% 17% 10% 3	2528
	11th to 20th	Day	68% 12% 12% 6% 2	2530
	21st to end	Day	66% 9% 15% 7% 3	2903
February	1st to 10th	Day	59% 9% 11% 16% 5%	1710
	11th to 20th	Day	57% 9% 12% 15% 7% 1	1757
	21st to end	Day	54% 9% 13% 16% 6% 1	1570
March	1st to 10th	Day	51% 8% 13% 20% 7% 1	3179
	11th to 20th	Day	47% 11% 14% 19% 7% 2	3480
	21st to end	Day	52% 11% 12% 14% 11% 1	3815
April	1st to 10th	Day	53% 7% 11% 18% 10% 1	2228
	11th to 20th	Day	45% 7% 13% 19% 15% 1	2437
	21st to end	Day	45% 8% 15% 16% 13% 3	2470
May	1st to 10th	Day	43% 8% 13% 18% 17% 2	4120
	11th to 20th	Day	38% 9% 15% 25% 11% 2	4085
	21st to end	Day	32% 9% 13% 20% 22% 5%	4900
June	1st to 10th	Day	36% 9% 14% 25% 14% 2	2850
	11th to 20th	Day	34% 9% 13% 24% 17% 2	2850
	21st to end	Day	36% 10% 13% 25% 14% 1	2850
July	1st to 10th	Day	40% 9% 14% 20% 15% 2	4544
	11th to 20th	Day	30% 9% 15% 31% 13% 1	4365
	21st to end	Day	31% 9% 18% 22% 19% 1	4553
August	1st to 10th	Day	33% 10% 15% 28% 13% 1	4091
	11th to 20th	Day	35% 9% 17% 26% 12% 1	4083
	21st to end	Day	35% 10% 16% 27% 11% 1	4531
September	1st to 10th	Day	37% 9% 14% 27% 12% 1	2182
	11th to 20th	Day	32% 10% 16% 29% 12% 1	2090
	21st to end	Day	42% 9% 17% 21% 10%	2090
October	1st to 10th	Day	33% 6% 10% 34% 15% 2	3357
	11th to 20th	Day	46% 5% 15% 23% 12%	3140
	21st to end	Day	51% 8% 14% 18% 8%	3095
November	1st to 10th	Day	51% 8% 13% 19% 9%	1699
	11th to 20th	Day	55% 9% 17% 13% 7%	1649
	21st to end	Day	61% 8% 17% 12% 2 1	1520
December	1st to 10th	Day	60% 10% 17% 10% 2	1459
	11th to 20th	Day	60% 9% 15% 12% 3	1671
	21st to end	Day	79% 7% 7% 5% 2	2431
January	1st to 10th	Night	57% 9% 15% 14% 4	4428
	11th to 20th	Night	67% 10% 11% 9% 2	4440
	21st to end	Night	68% 8% 10% 10% 3	4757
February	1st to 10th	Night	57% 7% 12% 15% 7% 1	2470
	11th to 20th	Night	53% 7% 14% 18% 7% 1	2318
	21st to end	Night	57% 6% 12% 15% 8%	1884
March	1st to 10th	Night	43% 7% 16% 25% 8% 1	3674
	11th to 20th	Night	39% 8% 18% 23% 10% 1	3480
	21st to end	Night	46% 9% 13% 22% 10% 1	3817
April	1st to 10th	Night	48% 6% 10% 20% 14% 2	1967
	11th to 20th	Night	45% 6% 9% 22% 16% 3	1692
	21st to end	Night	49% 5% 9% 18% 15% 4	1710
May	1st to 10th	Night	42% 9% 12% 18% 17% 3	2840
	11th to 20th	Night	39% 9% 11% 26% 13% 2	2813
	21st to end	Night	34% 8% 11% 23% 19% 5%	2676
June	1st to 10th	Night	38% 6% 11% 26% 17% 2	1330
	11th to 20th	Night	33% 8% 14% 23% 20% 2	1330
	21st to end	Night	37% 8% 11% 22% 18% 3	1330
July	1st to 10th	Night	37% 5% 14% 21% 16% 5%	2299
	11th to 20th	Night	28% 7% 13% 37% 14% 1	2482
	21st to end	Night	30% 8% 17% 23% 20% 1	2766
August	1st to 10th	Night	32% 6% 15% 30% 15% 1	2814
	11th to 20th	Night	30% 6% 18% 31% 12% 3	2812
	21st to end	Night	31% 8% 15% 33% 12% 1	3124
September	1st to 10th	Night	32% 8% 13% 29% 16% 1	1975
	11th to 20th	Night	30% 8% 15% 33% 14%	2090
	21st to end	Night	41% 8% 16% 25% 11%	2090
October	1st to 10th	Night	29% 6% 12% 32% 20% 1	3603
	11th to 20th	Night	43% 6% 12% 24% 14%	3779
	21st to end	Night	46% 5% 16% 25% 8%	4436
November	1st to 10th	Night	44% 7% 16% 24% 9% 1	2452
	11th to 20th	Night	55% 7% 16% 15% 5%	2529
	21st to end	Night	57% 9% 18% 13% 3	2660
December	1st to 10th	Night	59% 9% 14% 13% 4	2717
	11th to 20th	Night	57% 10% 16% 12% 4	3525
	21st to end	Night	75% 8% 9% 6% 2	5233

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	18% 14% 37% 23% 8%	270
	11th to 20th	Day	20% 14% 36% 21% 8%	270
	21st to end	Day	24% 7% 32% 29% 6% 1	297
February	1st to 10th	Day	19% 19% 37% 20% 4	270
	11th to 20th	Day	16% 18% 42% 20% 3	270
	21st to end	Day	19% 19% 44% 17% 2	225
March	1st to 10th	Day	18% 17% 38% 19% 7%	303
	11th to 20th	Day	18% 14% 33% 26% 9% 1	460
	21st to end	Day	22% 10% 33% 28% 7% 1	506
April	1st to 10th	Day	22% 10% 33% 26% 8%	460
	11th to 20th	Day	23% 12% 28% 23% 12% 3	452
	21st to end	Day	20% 10% 33% 25% 11% 2	460
May	1st to 10th	Day	18% 9% 31% 28% 10% 3	463
	11th to 20th	Day	17% 5% 25% 32% 17% 4	487
	21st to end	Day	12% 4 24% 33% 22% 4	644
June	1st to 10th	Day	11% 4 29% 38% 17% 3	680
	11th to 20th	Day	12% 4 29% 34% 18% 3	680
	21st to end	Day	12% 5% 25% 36% 18% 3	680
July	1st to 10th	Day	7% 3 21% 39% 24% 5%	671
	11th to 20th	Day	9% 4 22% 39% 19% 6%	668
	21st to end	Day	9% 4 21% 40% 22% 5%	677
August	1st to 10th	Day	10% 3 21% 33% 26% 8%	486
	11th to 20th	Day	7% 3 16% 36% 28% 10%	479
	21st to end	Day	11% 5% 20% 35% 23% 6%	539
September	1st to 10th	Day	12% 6% 25% 30% 19% 8%	490
	11th to 20th	Day	11% 5% 18% 30% 24% 11%	490
	21st to end	Day	16% 6% 26% 25% 21% 6%	490
October	1st to 10th	Day	19% 10% 26% 25% 15% 4	490
	11th to 20th	Day	22% 14% 29% 27% 7% 1	490
	21st to end	Day	23% 16% 33% 23% 5%	344
November	1st to 10th	Day	14% 12% 39% 25% 8% 1	279
	11th to 20th	Day	16% 21% 34% 22% 5% 1	241
	21st to end	Day	21% 13% 46% 18% 2	180
December	1st to 10th	Day	22% 13% 36% 20% 8% 1	180
	11th to 20th	Day	27% 18% 38% 15% 2	180
	21st to end	Day	26% 17% 38% 16% 3 1	198
January	1st to 10th	Night	20% 12% 35% 26% 6% 1	950
	11th to 20th	Night	22% 13% 34% 24% 7%	950
	21st to end	Night	18% 9% 35% 30% 8% 1	970
February	1st to 10th	Night	18% 8% 40% 31% 4	760
	11th to 20th	Night	21% 11% 35% 27% 6%	743
	21st to end	Night	20% 12% 38% 26% 4	628
March	1st to 10th	Night	16% 9% 38% 28% 9% 1	760
	11th to 20th	Night	15% 11% 37% 27% 9% 1	760
	21st to end	Night	21% 10% 29% 31% 8% 1	836
April	1st to 10th	Night	22% 8% 35% 27% 8% 1	637
	11th to 20th	Night	22% 7% 28% 28% 13% 2	563
	21st to end	Night	21% 5% 25% 35% 13% 1	570
May	1st to 10th	Night	14% 4 25% 42% 13% 2	570
	11th to 20th	Night	17% 4 20% 37% 20% 1	561
	21st to end	Night	14% 2 19% 38% 25% 2	499
June	1st to 10th	Night	13% 3 23% 39% 20% 1	380
	11th to 20th	Night	9% 3 24% 37% 25% 2	380
	21st to end	Night	9% 4 18% 40% 27% 3	380
July	1st to 10th	Night	7% 2 14% 47% 26% 3	442
	11th to 20th	Night	7% 2 16% 40% 29% 6%	552
	21st to end	Night	9% 3 15% 42% 30% 2	624
August	1st to 10th	Night	10% 2 14% 39% 32% 4	567
	11th to 20th	Night	9% 2 17% 31% 35% 6%	564
	21st to end	Night	12% 3 20% 34% 28% 3	627
September	1st to 10th	Night	11% 6% 21% 35% 22% 6%	666
	11th to 20th	Night	11% 3 19% 33% 27% 7%	760
	21st to end	Night	18% 5% 23% 28% 20% 7%	760
October	1st to 10th	Night	19% 7% 27% 29% 17% 2	760
	11th to 20th	Night	23% 9% 32% 27% 8%	760
	21st to end	Night	24% 11% 31% 27% 5% 1	836
November	1st to 10th	Night	18% 10% 32% 28% 10% 1	755
	11th to 20th	Night	18% 14% 36% 23% 9%	760
	21st to end	Night	24% 13% 37% 22% 5%	760
December	1st to 10th	Night	23% 14% 36% 21% 5%	817
	11th to 20th	Night	22% 13% 40% 20% 4 1	950
	21st to end	Night	29% 12% 34% 21% 4	1045

Page generated at 2024-11-01 22:47:52. Version ac07

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