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 2024-11-28.

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% 9% 3 8% 5% 5% 5% 4 6% 7% 35%	101235
	Night	13% 10% 4 8% 5% 5% 4 4 5% 7% 35%	98310
Transparency	Day	45% 6% 13% 22% 12% 1	104807
	Night	47% 6% 12% 22% 12% 1	102878
Seeing	Day	15% 8% 29% 28% 14% 5%	15590
	Night	18% 6% 29% 32% 13% 2	25227

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	14% 14% 6% 11% 7% 7% 6% 3 5% 6% 21%	2527
	11th to 20th	Day	13% 15% 6% 15% 10% 8% 7% 5% 5% 6% 11%	2530
	21st to end	Day	21% 17% 5% 12% 6% 5% 5% 3 5% 5% 16%	2858
February	1st to 10th	Day	11% 13% 4 11% 8% 6% 6% 5% 4 8% 24%	1710
	11th to 20th	Day	10% 12% 5% 12% 7% 6% 6% 3 4 4 28%	1787
	21st to end	Day	13% 11% 4 10% 6% 7% 6% 4 5% 7% 26%	1570
March	1st to 10th	Day	14% 12% 3 8% 6% 6% 4 4 5% 5% 32%	3142
	11th to 20th	Day	12% 9% 4 9% 6% 6% 5% 5% 6% 7% 31%	3480
	21st to end	Day	16% 11% 4 8% 7% 6% 6% 4 4 5% 29%	3815
April	1st to 10th	Day	16% 11% 4 8% 6% 5% 5% 3 6% 6% 31%	2261
	11th to 20th	Day	16% 8% 3 6% 5% 3 5% 4 5% 7% 37%	2404
	21st to end	Day	15% 8% 3 9% 5% 5% 5% 4 6% 6% 35%	2470
May	1st to 10th	Day	14% 8% 3 7% 5% 4 5% 4 7% 8% 36%	4082
	11th to 20th	Day	13% 6% 2 6% 4 5% 5% 4 6% 8% 41%	4081
	21st to end	Day	10% 7% 2 6% 4 3 4 3 5% 8% 49%	4698
June	1st to 10th	Day	11% 6% 2 6% 4 4 5% 4 7% 9% 42%	2845
	11th to 20th	Day	9% 6% 2 6% 4 5% 5% 4 7% 8% 44%	2850
	21st to end	Day	9% 5% 2 6% 4 6% 6% 5% 7% 9% 41%	2827
July	1st to 10th	Day	10% 6% 2 7% 5% 5% 5% 5% 7% 9% 39%	4440
	11th to 20th	Day	6% 4 2 5% 4 4 6% 5% 6% 10% 48%	4440
	21st to end	Day	7% 4 2 6% 4 5% 5% 5% 7% 10% 44%	4734
August	1st to 10th	Day	9% 4 2 5% 4 5% 6% 5% 7% 9% 42%	4104
	11th to 20th	Day	11% 5% 2 5% 4 4 5% 4 7% 8% 46%	4044
	21st to end	Day	9% 6% 2 6% 4 4 5% 3 6% 8% 45%	4475
September	1st to 10th	Day	8% 6% 2 7% 5% 5% 5% 4 6% 9% 43%	2185
	11th to 20th	Day	10% 4 2 6% 3 4 5% 4 5% 9% 49%	2090
	21st to end	Day	12% 7% 2 6% 5% 5% 6% 4 5% 9% 38%	2090
October	1st to 10th	Day	15% 7% 2 6% 4 4 4 4 5% 6% 42%	2047
	11th to 20th	Day	19% 10% 4 7% 5% 5% 5% 3 5% 7% 30%	1891
	21st to end	Day	18% 9% 3 9% 7% 6% 5% 4 7% 6% 26%	1881
November	1st to 10th	Day	13% 8% 4 8% 6% 6% 5% 5% 6% 7% 34%	1762
	11th to 20th	Day	13% 12% 4 9% 7% 5% 6% 5% 6% 7% 27%	1800
	21st to end	Day	16% 14% 4 10% 6% 6% 5% 4 4 7% 24%	1605
December	1st to 10th	Day	12% 13% 5% 13% 7% 6% 6% 4 5% 6% 23%	1444
	11th to 20th	Day	13% 15% 5% 9% 7% 5% 5% 4 6% 5% 24%	1675
	21st to end	Day	27% 18% 7% 12% 6% 5% 5% 3 3 5% 11%	2591
January	1st to 10th	Night	15% 14% 6% 10% 6% 5% 4 3 5% 6% 26%	4428
	11th to 20th	Night	13% 15% 5% 15% 10% 8% 6% 4 4 5% 15%	4440
	21st to end	Night	17% 19% 7% 12% 6% 4 4 3 5% 6% 17%	4806
February	1st to 10th	Night	12% 15% 4 9% 7% 6% 6% 4 6% 5% 26%	2470
	11th to 20th	Night	13% 13% 4 10% 6% 4 5% 4 6% 7% 29%	2274
	21st to end	Night	15% 13% 4 12% 6% 5% 5% 3 4 6% 27%	1884
March	1st to 10th	Night	13% 9% 3 8% 5% 4 3 3 4 6% 41%	3710
	11th to 20th	Night	10% 8% 3 7% 4 4 5% 4 6% 8% 41%	3480
	21st to end	Night	14% 9% 4 9% 6% 5% 5% 3 5% 6% 33%	3817
April	1st to 10th	Night	16% 10% 3 7% 5% 4 4 4 5% 7% 34%	1934
	11th to 20th	Night	18% 7% 2 6% 5% 4 3 3 5% 8% 38%	1725
	21st to end	Night	17% 9% 3 7% 4 4 3 4 5% 6% 37%	1710
May	1st to 10th	Night	12% 7% 3 7% 5% 5% 5% 4 6% 8% 39%	2813
	11th to 20th	Night	14% 7% 3 6% 4 4 5% 4 6% 8% 39%	2812
	21st to end	Night	11% 5% 2 6% 4 4 4 3 5% 8% 48%	2848
June	1st to 10th	Night	12% 7% 3 5% 5% 4 5% 4 5% 7% 44%	1330
	11th to 20th	Night	10% 5% 2 6% 4 5% 4 3 7% 9% 45%	1330
	21st to end	Night	8% 6% 3 6% 4 5% 6% 4 6% 6% 46%	1346
July	1st to 10th	Night	8% 6% 3 8% 4 4 4 4 6% 8% 45%	2530
	11th to 20th	Night	7% 4 1 5% 4 4 4 4 5% 6% 56%	2530
	21st to end	Night	7% 4 2 6% 5% 4 5% 4 5% 9% 48%	2827
August	1st to 10th	Night	8% 5% 2 5% 4 4 5% 4 6% 8% 48%	2825
	11th to 20th	Night	11% 5% 2 5% 3 3 4 3 6% 8% 49%	2785
	21st to end	Night	7% 5% 2 6% 4 4 4 4 7% 9% 49%	3178
September	1st to 10th	Night	8% 5% 3 5% 5% 5% 5% 3 6% 8% 49%	1976
	11th to 20th	Night	10% 4 2 4 3 4 3 3 5% 6% 56%	2090
	21st to end	Night	13% 6% 3 6% 4 4 4 3 6% 9% 42%	2090
October	1st to 10th	Night	15% 5% 2 5% 4 4 4 3 6% 8% 44%	2132
	11th to 20th	Night	19% 8% 3 7% 5% 5% 3 3 4 6% 37%	2286
	21st to end	Night	20% 10% 4 7% 4 4 5% 4 5% 6% 32%	2717
November	1st to 10th	Night	12% 9% 2 7% 5% 4 5% 3 5% 7% 41%	2536
	11th to 20th	Night	13% 12% 3 9% 6% 6% 5% 5% 6% 7% 28%	2600
	21st to end	Night	17% 14% 4 8% 6% 5% 5% 4 6% 6% 26%	2727
December	1st to 10th	Night	15% 15% 5% 11% 6% 5% 5% 4 5% 6% 23%	2731
	11th to 20th	Night	13% 14% 4 11% 6% 6% 5% 5% 6% 6% 25%	3522
	21st to end	Night	25% 21% 6% 10% 5% 4 3 3 3 4 15%	5071

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	62% 8% 14% 11% 4	2528
	11th to 20th	Day	73% 6% 9% 9% 3	2530
	21st to end	Day	69% 6% 12% 9% 3 1	2858
February	1st to 10th	Day	60% 5% 11% 17% 6%	1710
	11th to 20th	Day	59% 4 10% 18% 8% 1	1797
	21st to end	Day	56% 5% 12% 18% 7% 1	1570
March	1st to 10th	Day	52% 6% 12% 23% 6% 1	3142
	11th to 20th	Day	49% 6% 14% 19% 9% 2	3480
	21st to end	Day	55% 7% 9% 15% 12% 1	3815
April	1st to 10th	Day	54% 5% 11% 18% 11% 1	2261
	11th to 20th	Day	45% 5% 11% 22% 15% 2	2404
	21st to end	Day	48% 5% 13% 18% 13% 3	2470
May	1st to 10th	Day	43% 7% 11% 19% 17% 2	4120
	11th to 20th	Day	39% 7% 14% 27% 12% 2	4085
	21st to end	Day	33% 5% 14% 23% 22% 3	4711
June	1st to 10th	Day	37% 7% 13% 28% 14% 2	2845
	11th to 20th	Day	36% 7% 13% 24% 19% 2	2850
	21st to end	Day	37% 8% 15% 26% 14% 1	2827
July	1st to 10th	Day	40% 6% 16% 21% 15% 2	4371
	11th to 20th	Day	28% 7% 16% 33% 15% 1	4365
	21st to end	Day	32% 9% 16% 21% 20% 1	4584
August	1st to 10th	Day	35% 7% 15% 26% 15% 1	4091
	11th to 20th	Day	34% 6% 15% 31% 13% 1	4083
	21st to end	Day	35% 6% 16% 29% 13% 1	4474
September	1st to 10th	Day	36% 7% 14% 28% 13% 2	2185
	11th to 20th	Day	33% 6% 15% 32% 14% 1	2090
	21st to end	Day	42% 6% 14% 25% 12%	2090
October	1st to 10th	Day	31% 5% 10% 34% 17% 3	3398
	11th to 20th	Day	41% 5% 13% 29% 12%	3119
	21st to end	Day	51% 6% 13% 21% 9% 1	3081
November	1st to 10th	Day	48% 7% 12% 23% 10%	1762
	11th to 20th	Day	54% 6% 15% 16% 9% 1	1800
	21st to end	Day	60% 5% 14% 15% 5% 1	1605
December	1st to 10th	Day	61% 5% 13% 18% 2	1444
	11th to 20th	Day	58% 7% 13% 17% 4 1	1671
	21st to end	Day	77% 5% 8% 8% 3	2591
January	1st to 10th	Night	58% 6% 12% 17% 7% 1	4428
	11th to 20th	Night	70% 5% 9% 12% 4	4440
	21st to end	Night	67% 5% 12% 12% 4	4806
February	1st to 10th	Night	58% 5% 9% 19% 8% 1	2470
	11th to 20th	Night	54% 6% 10% 19% 9% 1	2275
	21st to end	Night	58% 4 10% 17% 9%	1884
March	1st to 10th	Night	44% 4 16% 27% 8% 1	3710
	11th to 20th	Night	39% 6% 16% 24% 14% 1	3480
	21st to end	Night	49% 7% 13% 21% 9% 1	3817
April	1st to 10th	Night	49% 4 9% 22% 13% 2	1934
	11th to 20th	Night	45% 5% 9% 22% 17% 2	1725
	21st to end	Night	47% 4 10% 20% 16% 3	1710
May	1st to 10th	Night	42% 7% 11% 20% 17% 3	2840
	11th to 20th	Night	40% 7% 10% 28% 12% 3	2813
	21st to end	Night	35% 6% 12% 24% 18% 6%	2856
June	1st to 10th	Night	39% 5% 11% 25% 19% 2	1330
	11th to 20th	Night	35% 6% 14% 23% 20% 2	1330
	21st to end	Night	35% 7% 12% 26% 17% 3	1346
July	1st to 10th	Night	35% 5% 13% 26% 15% 6%	2490
	11th to 20th	Night	27% 6% 13% 37% 16% 1	2482
	21st to end	Night	34% 6% 17% 23% 19% 1	2737
August	1st to 10th	Night	31% 7% 16% 30% 15% 1	2814
	11th to 20th	Night	31% 6% 17% 30% 15% 1	2812
	21st to end	Night	30% 6% 15% 31% 16% 1	3178
September	1st to 10th	Night	33% 6% 14% 29% 18% 1	1976
	11th to 20th	Night	29% 5% 12% 37% 16% 1	2090
	21st to end	Night	39% 6% 15% 30% 11% 1	2090
October	1st to 10th	Night	27% 5% 11% 34% 21% 1	3561
	11th to 20th	Night	42% 4 12% 26% 16% 1	3797
	21st to end	Night	46% 4 12% 28% 10%	4467
November	1st to 10th	Night	42% 5% 14% 26% 12% 1	2536
	11th to 20th	Night	53% 6% 13% 19% 8% 1	2600
	21st to end	Night	57% 6% 16% 16% 5%	2727
December	1st to 10th	Night	62% 5% 12% 16% 5%	2731
	11th to 20th	Night	57% 7% 14% 13% 8% 2	3525
	21st to end	Night	72% 6% 8% 9% 4	5071

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	17% 13% 34% 26% 7% 2	270
	11th to 20th	Day	22% 12% 35% 21% 9%	270
	21st to end	Day	22% 8% 32% 29% 8% 1	297
February	1st to 10th	Day	18% 17% 37% 23% 4 1	270
	11th to 20th	Day	15% 15% 43% 23% 4	270
	21st to end	Day	20% 15% 46% 16% 3	225
March	1st to 10th	Day	20% 15% 42% 19% 4	279
	11th to 20th	Day	18% 10% 30% 30% 11% 1	460
	21st to end	Day	23% 9% 32% 25% 8% 2	506
April	1st to 10th	Day	19% 11% 35% 25% 9% 1	460
	11th to 20th	Day	23% 13% 33% 20% 8% 4	452
	21st to end	Day	20% 9% 31% 27% 12% 2	460
May	1st to 10th	Day	19% 9% 33% 26% 10% 3	463
	11th to 20th	Day	17% 5% 27% 31% 14% 6%	487
	21st to end	Day	14% 5% 26% 29% 20% 6%	660
June	1st to 10th	Day	12% 6% 31% 31% 15% 4	680
	11th to 20th	Day	12% 7% 28% 33% 15% 5%	680
	21st to end	Day	13% 5% 27% 33% 17% 5%	680
July	1st to 10th	Day	7% 3 22% 35% 23% 10%	671
	11th to 20th	Day	9% 4 25% 35% 18% 8%	668
	21st to end	Day	8% 3 24% 37% 21% 7%	696
August	1st to 10th	Day	9% 2 21% 31% 24% 12%	486
	11th to 20th	Day	9% 3 14% 34% 27% 13%	479
	21st to end	Day	12% 5% 18% 33% 24% 8%	539
September	1st to 10th	Day	11% 3 26% 31% 19% 11%	490
	11th to 20th	Day	9% 4 18% 28% 26% 14%	490
	21st to end	Day	18% 6% 20% 27% 21% 8%	490
October	1st to 10th	Day	19% 9% 26% 26% 13% 7%	490
	11th to 20th	Day	21% 12% 29% 29% 8% 1	481
	21st to end	Day	20% 12% 35% 24% 7% 1	330
November	1st to 10th	Day	16% 15% 36% 22% 8% 3	300
	11th to 20th	Day	19% 17% 39% 19% 5% 1	300
	21st to end	Day	22% 13% 35% 25% 6%	208
December	1st to 10th	Day	21% 11% 38% 21% 8% 2	180
	11th to 20th	Day	23% 16% 39% 18% 4 1	180
	21st to end	Day	28% 13% 35% 19% 4	243
January	1st to 10th	Night	19% 8% 36% 28% 8% 1	950
	11th to 20th	Night	22% 9% 35% 27% 7% 1	950
	21st to end	Night	18% 6% 31% 36% 9% 1	993
February	1st to 10th	Night	20% 7% 38% 30% 5%	760
	11th to 20th	Night	20% 9% 37% 27% 6%	743
	21st to end	Night	21% 8% 39% 27% 4	628
March	1st to 10th	Night	17% 6% 35% 33% 9%	760
	11th to 20th	Night	16% 8% 36% 30% 8% 1	760
	21st to end	Night	22% 7% 30% 32% 7% 1	836
April	1st to 10th	Night	21% 8% 33% 29% 9% 1	604
	11th to 20th	Night	22% 8% 26% 33% 9% 2	563
	21st to end	Night	22% 5% 26% 35% 12% 1	570
May	1st to 10th	Night	14% 5% 30% 39% 12% 2	570
	11th to 20th	Night	19% 2 23% 37% 17% 2	561
	21st to end	Night	14% 2 23% 37% 23% 2	617
June	1st to 10th	Night	15% 3 27% 38% 16% 1	380
	11th to 20th	Night	12% 2 24% 39% 21% 2	380
	21st to end	Night	9% 5% 20% 41% 22% 3	396
July	1st to 10th	Night	8% 2 14% 46% 26% 4	555
	11th to 20th	Night	9% 2 18% 40% 26% 5%	552
	21st to end	Night	10% 2 18% 44% 23% 2	624
August	1st to 10th	Night	8% 2 15% 44% 28% 3	567
	11th to 20th	Night	10% 1 17% 33% 34% 5%	564
	21st to end	Night	12% 3 16% 40% 27% 3	627
September	1st to 10th	Night	9% 3 24% 35% 23% 5%	646
	11th to 20th	Night	11% 3 18% 36% 27% 6%	760
	21st to end	Night	15% 5% 23% 32% 20% 5%	760
October	1st to 10th	Night	18% 5% 28% 30% 17% 2	760
	11th to 20th	Night	24% 8% 30% 29% 9% 1	760
	21st to end	Night	24% 8% 34% 28% 5% 1	836
November	1st to 10th	Night	16% 11% 33% 28% 12% 1	780
	11th to 20th	Night	19% 12% 36% 24% 9% 1	800
	21st to end	Night	23% 10% 39% 23% 5%	789
December	1st to 10th	Night	22% 10% 35% 27% 5% 1	831
	11th to 20th	Night	21% 9% 39% 25% 5%	950
	21st to end	Night	29% 8% 33% 26% 4	1045

Page generated at 2024-11-25 00:22:19. Version ac07

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