Outdoor Adventures Saginaw Bay Resort
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Outdoor Adventures Saginaw Bay Resort clear sky chart from 2005-11-06 to 2026-01-17.

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	12% 8% 3 8% 5% 5% 5% 4 6% 8% 35%	126598
	Night	13% 10% 4 8% 5% 5% 4 4 5% 7% 35%	125246
Transparency	Day	45% 6% 13% 22% 12% 1	130123
	Night	47% 5% 12% 22% 12% 1	129792
Seeing	Day	16% 9% 29% 28% 14% 5%	17062
	Night	17% 7% 29% 32% 13% 2	26795

By Month

Percentage Cloud Cover SE (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	10% 12% 6% 13% 8% 7% 7% 4 5% 6% 22%	3697
	11th to 20th	Day	11% 13% 5% 16% 10% 8% 7% 5% 5% 6% 14%	3668
	21st to end	Day	16% 15% 5% 12% 6% 6% 5% 4 5% 6% 20%	4096
February	1st to 10th	Day	12% 13% 4 11% 8% 6% 6% 5% 4 8% 24%	1800
	11th to 20th	Day	11% 13% 6% 12% 8% 7% 6% 3 4 5% 27%	1884
	21st to end	Day	12% 11% 4 10% 7% 7% 5% 4 6% 7% 26%	1650
March	1st to 10th	Day	12% 9% 3 7% 6% 6% 5% 4 6% 7% 36%	4516
	11th to 20th	Day	12% 9% 4 9% 5% 5% 5% 5% 6% 9% 31%	4980
	21st to end	Day	19% 10% 3 8% 6% 6% 5% 4 4 5% 29%	5465
April	1st to 10th	Day	15% 11% 4 8% 6% 5% 5% 4 6% 6% 30%	2380
	11th to 20th	Day	15% 8% 3 7% 5% 3 5% 4 5% 7% 38%	2532
	21st to end	Day	14% 8% 3 9% 5% 5% 5% 4 6% 6% 35%	2600
May	1st to 10th	Day	16% 8% 3 7% 5% 4 5% 4 6% 7% 36%	5862
	11th to 20th	Day	13% 7% 3 7% 5% 5% 4 4 6% 7% 39%	5861
	21st to end	Day	12% 7% 2 6% 4 4 4 3 5% 7% 44%	6753
June	1st to 10th	Day	11% 6% 2 6% 4 4 5% 4 7% 9% 43%	2995
	11th to 20th	Day	9% 6% 2 6% 4 5% 5% 4 7% 8% 43%	3000
	21st to end	Day	9% 5% 2 6% 4 6% 5% 5% 7% 9% 41%	2976
July	1st to 10th	Day	9% 6% 2 7% 5% 5% 5% 4 7% 10% 41%	6360
	11th to 20th	Day	6% 5% 2 6% 4 4 5% 4 6% 9% 48%	6360
	21st to end	Day	6% 4 2 5% 4 4 5% 4 7% 10% 48%	6817
August	1st to 10th	Day	9% 4 2 5% 4 5% 6% 5% 7% 9% 43%	4234
	11th to 20th	Day	11% 5% 2 5% 4 4 5% 4 7% 8% 46%	4174
	21st to end	Day	9% 6% 2 6% 4 4 5% 4 6% 9% 45%	4616
September	1st to 10th	Day	7% 5% 2 7% 5% 5% 5% 4 6% 9% 43%	2300
	11th to 20th	Day	10% 5% 2 6% 3 4 5% 4 5% 9% 49%	2200
	21st to end	Day	12% 7% 2 6% 5% 5% 6% 4 5% 9% 39%	2200
October	1st to 10th	Day	15% 6% 2 6% 4 4 4 4 5% 6% 43%	2155
	11th to 20th	Day	18% 9% 4 7% 5% 5% 5% 3 5% 7% 31%	1990
	21st to end	Day	17% 8% 3 9% 7% 6% 5% 4 7% 7% 27%	1980
November	1st to 10th	Day	12% 8% 4 9% 5% 6% 5% 5% 6% 7% 34%	1852
	11th to 20th	Day	13% 12% 4 9% 7% 5% 5% 5% 6% 7% 27%	1890
	21st to end	Day	16% 14% 4 10% 6% 6% 6% 4 4 7% 23%	1710
December	1st to 10th	Day	12% 14% 5% 13% 8% 7% 7% 5% 6% 7% 17%	2548
	11th to 20th	Day	16% 17% 6% 10% 7% 6% 4 4 5% 4 20%	2695
	21st to end	Day	26% 20% 7% 11% 6% 4 4 3 3 4 12%	3802
January	1st to 10th	Night	11% 11% 6% 12% 6% 5% 4 3 5% 7% 29%	6488
	11th to 20th	Night	12% 14% 5% 14% 9% 8% 6% 4 5% 6% 16%	6445
	21st to end	Night	12% 17% 6% 11% 6% 4 5% 4 6% 7% 21%	6876
February	1st to 10th	Night	12% 15% 4 10% 7% 5% 6% 4 6% 5% 25%	2600
	11th to 20th	Night	13% 13% 4 10% 6% 4 5% 4 6% 7% 28%	2397
	21st to end	Night	15% 12% 4 12% 6% 5% 5% 4 4 7% 26%	1980
March	1st to 10th	Night	14% 8% 2 8% 4 4 4 4 5% 7% 40%	5336
	11th to 20th	Night	10% 8% 3 7% 4 4 5% 4 7% 9% 39%	4980
	21st to end	Night	16% 9% 4 8% 6% 5% 5% 3 5% 6% 34%	5467
April	1st to 10th	Night	16% 10% 3 8% 5% 4 4 3 5% 7% 35%	2036
	11th to 20th	Night	18% 7% 3 6% 5% 4 3 3 5% 7% 38%	1817
	21st to end	Night	17% 9% 3 7% 4 5% 3 4 5% 6% 37%	1800
May	1st to 10th	Night	14% 8% 3 7% 5% 5% 5% 4 5% 8% 36%	4033
	11th to 20th	Night	16% 8% 3 6% 4 4 5% 4 6% 7% 37%	4032
	21st to end	Night	16% 5% 2 5% 3 4 3 2 5% 7% 47%	4099
June	1st to 10th	Night	12% 7% 3 5% 5% 4 5% 4 5% 7% 44%	1400
	11th to 20th	Night	11% 5% 2 6% 4 5% 4 3 7% 9% 44%	1400
	21st to end	Night	8% 6% 3 6% 4 6% 6% 4 6% 7% 45%	1417
July	1st to 10th	Night	8% 6% 2 7% 4 4 4 4 7% 8% 45%	3618
	11th to 20th	Night	6% 4 2 5% 4 4 5% 4 6% 7% 53%	3617
	21st to end	Night	8% 4 2 6% 5% 4 5% 4 5% 8% 49%	4050
August	1st to 10th	Night	8% 5% 2 5% 4 4 5% 4 6% 8% 49%	2915
	11th to 20th	Night	11% 5% 2 5% 3 3 4 3 6% 8% 49%	2875
	21st to end	Night	7% 4 2 6% 4 4 4 3 7% 9% 49%	3279
September	1st to 10th	Night	8% 4 3 5% 5% 5% 5% 3 6% 8% 49%	2080
	11th to 20th	Night	9% 4 2 4 3 4 3 4 5% 6% 56%	2200
	21st to end	Night	13% 7% 3 6% 4 4 4 3 6% 9% 42%	2200
October	1st to 10th	Night	15% 5% 2 5% 4 4 4 3 6% 8% 45%	2244
	11th to 20th	Night	18% 8% 3 6% 5% 5% 3 3 4 6% 37%	2407
	21st to end	Night	19% 10% 4 7% 4 4 5% 4 5% 7% 33%	2860
November	1st to 10th	Night	12% 8% 2 7% 5% 4 5% 3 5% 7% 40%	2666
	11th to 20th	Night	13% 11% 3 9% 6% 6% 5% 5% 6% 7% 29%	2730
	21st to end	Night	16% 14% 4 8% 6% 5% 5% 4 6% 6% 26%	2907
December	1st to 10th	Night	11% 14% 4 11% 6% 5% 6% 4 7% 7% 24%	4851
	11th to 20th	Night	13% 17% 5% 11% 6% 5% 4 4 5% 5% 24%	5732
	21st to end	Night	24% 20% 6% 10% 5% 4 3 3 3 4 17%	7412

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	58% 8% 12% 15% 5% 1	3698
	11th to 20th	Day	68% 6% 8% 10% 7%	3668
	21st to end	Day	62% 7% 13% 10% 7% 1	4096
February	1st to 10th	Day	59% 6% 11% 18% 6%	1800
	11th to 20th	Day	60% 4 10% 17% 8% 1	1894
	21st to end	Day	56% 5% 12% 18% 8% 1	1650
March	1st to 10th	Day	46% 5% 15% 20% 10% 4	4516
	11th to 20th	Day	48% 5% 17% 18% 10% 2	4980
	21st to end	Day	55% 7% 10% 16% 11% 1	5465
April	1st to 10th	Day	54% 5% 11% 18% 11% 1	2380
	11th to 20th	Day	45% 5% 11% 22% 15% 2	2532
	21st to end	Day	47% 5% 13% 19% 13% 2	2600
May	1st to 10th	Day	45% 7% 11% 18% 18% 2	5897
	11th to 20th	Day	42% 7% 11% 23% 15% 2	5865
	21st to end	Day	39% 5% 12% 22% 19% 4	6767
June	1st to 10th	Day	37% 6% 13% 28% 14% 2	2995
	11th to 20th	Day	37% 6% 14% 23% 18% 2	3000
	21st to end	Day	37% 8% 15% 25% 14% 1	2976
July	1st to 10th	Day	36% 6% 16% 26% 14% 2	6291
	11th to 20th	Day	30% 6% 14% 34% 15% 1	6285
	21st to end	Day	29% 8% 16% 28% 19% 1	6622
August	1st to 10th	Day	34% 7% 15% 27% 15% 1	4221
	11th to 20th	Day	34% 6% 16% 31% 13% 1	4213
	21st to end	Day	35% 6% 16% 29% 13% 1	4615
September	1st to 10th	Day	36% 7% 15% 29% 12% 2	2300
	11th to 20th	Day	32% 6% 15% 32% 14% 1	2200
	21st to end	Day	42% 6% 14% 25% 13%	2200
October	1st to 10th	Day	31% 5% 10% 34% 17% 3	3506
	11th to 20th	Day	41% 5% 13% 29% 12%	3218
	21st to end	Day	50% 6% 13% 21% 9% 1	3180
November	1st to 10th	Day	47% 6% 12% 24% 10%	1852
	11th to 20th	Day	54% 6% 15% 16% 8%	1890
	21st to end	Day	60% 5% 14% 15% 5% 1	1710
December	1st to 10th	Day	64% 7% 15% 13% 2	2548
	11th to 20th	Day	65% 5% 9% 14% 6%	2691
	21st to end	Day	76% 5% 6% 8% 5%	3802
January	1st to 10th	Night	52% 6% 11% 20% 8% 3	6488
	11th to 20th	Night	66% 6% 10% 11% 6% 1	6445
	21st to end	Night	59% 6% 12% 15% 8%	6876
February	1st to 10th	Night	58% 5% 10% 19% 8% 1	2600
	11th to 20th	Night	54% 6% 10% 19% 9% 1	2398
	21st to end	Night	58% 4 11% 18% 9%	1980
March	1st to 10th	Night	43% 4 17% 23% 12% 1	5336
	11th to 20th	Night	40% 5% 20% 22% 11% 1	4980
	21st to end	Night	50% 5% 12% 20% 12% 1	5467
April	1st to 10th	Night	49% 4 9% 22% 13% 2	2036
	11th to 20th	Night	45% 5% 9% 22% 17% 2	1817
	21st to end	Night	48% 4 10% 19% 16% 3	1800
May	1st to 10th	Night	46% 6% 9% 18% 18% 3	4060
	11th to 20th	Night	45% 6% 9% 25% 13% 2	4033
	21st to end	Night	38% 5% 9% 27% 17% 5%	4107
June	1st to 10th	Night	39% 5% 10% 25% 19% 2	1400
	11th to 20th	Night	36% 7% 14% 23% 19% 2	1400
	21st to end	Night	36% 7% 12% 26% 17% 2	1417
July	1st to 10th	Night	34% 6% 14% 25% 17% 4	3580
	11th to 20th	Night	28% 6% 12% 35% 18% 1	3572
	21st to end	Night	32% 6% 15% 28% 18% 1	3933
August	1st to 10th	Night	31% 7% 15% 31% 15% 1	2904
	11th to 20th	Night	31% 6% 17% 30% 15% 1	2902
	21st to end	Night	30% 6% 16% 32% 16% 1	3279
September	1st to 10th	Night	32% 5% 14% 30% 17% 1	2080
	11th to 20th	Night	29% 5% 13% 37% 16% 1	2200
	21st to end	Night	39% 6% 15% 29% 11% 1	2200
October	1st to 10th	Night	27% 5% 11% 34% 21% 1	3673
	11th to 20th	Night	42% 4 11% 26% 16% 1	3918
	21st to end	Night	45% 4 12% 28% 11%	4610
November	1st to 10th	Night	43% 5% 13% 26% 12% 1	2666
	11th to 20th	Night	52% 6% 13% 20% 8% 1	2730
	21st to end	Night	57% 6% 15% 16% 5%	2907
December	1st to 10th	Night	57% 6% 19% 15% 4	4851
	11th to 20th	Night	59% 6% 11% 13% 10% 1	5735
	21st to end	Night	70% 5% 8% 9% 8%	7412

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% 13% 36% 25% 6% 2	330
	11th to 20th	Day	21% 15% 37% 19% 8%	318
	21st to end	Day	21% 10% 33% 28% 7% 2	330
February	1st to 10th	Day	19% 17% 38% 22% 4 1	300
	11th to 20th	Day	16% 16% 42% 21% 4	300
	21st to end	Day	22% 15% 44% 16% 3	249
March	1st to 10th	Day	20% 16% 41% 19% 4	310
	11th to 20th	Day	18% 11% 31% 29% 10% 1	500
	21st to end	Day	24% 10% 31% 25% 8% 1	550
April	1st to 10th	Day	20% 12% 34% 24% 9% 1	500
	11th to 20th	Day	22% 15% 32% 19% 8% 4	492
	21st to end	Day	19% 9% 32% 26% 12% 1	500
May	1st to 10th	Day	19% 10% 33% 25% 10% 3	503
	11th to 20th	Day	17% 6% 28% 30% 14% 6%	527
	21st to end	Day	14% 6% 27% 28% 19% 6%	711
June	1st to 10th	Day	12% 7% 33% 31% 15% 4	730
	11th to 20th	Day	12% 7% 28% 33% 15% 5%	730
	21st to end	Day	13% 5% 28% 33% 16% 5%	730
July	1st to 10th	Day	7% 3 23% 35% 23% 10%	721
	11th to 20th	Day	9% 4 25% 35% 18% 8%	718
	21st to end	Day	8% 3 24% 37% 21% 6%	749
August	1st to 10th	Day	8% 2 20% 32% 25% 12%	526
	11th to 20th	Day	9% 3 15% 35% 26% 13%	519
	21st to end	Day	11% 5% 18% 34% 24% 8%	583
September	1st to 10th	Day	11% 3 26% 31% 19% 11%	530
	11th to 20th	Day	8% 4 17% 28% 27% 16%	530
	21st to end	Day	17% 7% 20% 26% 22% 8%	530
October	1st to 10th	Day	18% 8% 26% 25% 15% 7%	530
	11th to 20th	Day	20% 11% 29% 31% 8% 1	520
	21st to end	Day	19% 12% 36% 25% 7% 1	363
November	1st to 10th	Day	16% 16% 35% 22% 8% 2	330
	11th to 20th	Day	19% 18% 38% 19% 5% 1	330
	21st to end	Day	22% 13% 35% 23% 6%	235
December	1st to 10th	Day	22% 11% 36% 21% 8% 2	220
	11th to 20th	Day	23% 19% 35% 18% 4	220
	21st to end	Day	31% 13% 36% 17% 4	298
January	1st to 10th	Night	18% 9% 36% 29% 7% 1	1050
	11th to 20th	Night	21% 9% 36% 26% 7% 1	1031
	21st to end	Night	17% 7% 32% 34% 9%	1045
February	1st to 10th	Night	20% 7% 38% 29% 5%	800
	11th to 20th	Night	20% 10% 38% 26% 6%	783
	21st to end	Night	21% 9% 39% 27% 4	660
March	1st to 10th	Night	17% 8% 35% 32% 9%	800
	11th to 20th	Night	16% 9% 36% 30% 7% 1	800
	21st to end	Night	22% 7% 31% 32% 7% 1	880
April	1st to 10th	Night	20% 9% 33% 29% 8% 1	636
	11th to 20th	Night	22% 9% 26% 32% 10% 2	593
	21st to end	Night	22% 6% 27% 35% 11% 1	600
May	1st to 10th	Night	14% 5% 30% 38% 11% 2	600
	11th to 20th	Night	19% 3 23% 36% 17% 2	591
	21st to end	Night	14% 2 23% 36% 22% 2	650
June	1st to 10th	Night	15% 3 28% 38% 16% 1	400
	11th to 20th	Night	12% 3 24% 40% 20% 2	400
	21st to end	Night	8% 5% 21% 42% 21% 3	417
July	1st to 10th	Night	8% 2 14% 46% 26% 4	585
	11th to 20th	Night	9% 3 17% 40% 26% 5%	582
	21st to end	Night	10% 2 18% 45% 23% 2	657
August	1st to 10th	Night	8% 2 14% 44% 28% 4	597
	11th to 20th	Night	9% 1 17% 34% 33% 5%	594
	21st to end	Night	12% 2 16% 40% 27% 3	660
September	1st to 10th	Night	9% 3 24% 34% 24% 5%	680
	11th to 20th	Night	11% 3 17% 35% 28% 7%	800
	21st to end	Night	15% 5% 22% 33% 20% 5%	800
October	1st to 10th	Night	17% 5% 27% 31% 18% 2	800
	11th to 20th	Night	24% 8% 30% 29% 10% 1	800
	21st to end	Night	23% 8% 33% 30% 5% 1	880
November	1st to 10th	Night	16% 11% 33% 28% 11% 1	820
	11th to 20th	Night	18% 13% 36% 24% 9% 1	840
	21st to end	Night	23% 11% 40% 23% 5%	840
December	1st to 10th	Night	21% 10% 35% 28% 5% 1	919
	11th to 20th	Night	21% 10% 39% 24% 5%	1050
	21st to end	Night	29% 9% 33% 25% 4	1155

Page generated at 2026-01-14 01:14:24. Version ac07

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