Stearns Scout Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stearns Scout Camp clear sky chart from 2005-11-06 to 2025-10-19.

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% 4 4 4 6% 7% 39%	127822
	Night	11% 9% 3 8% 5% 4 4 4 5% 7% 39%	121976
Transparency	Day	43% 6% 14% 25% 11% 1	131405
	Night	43% 6% 13% 25% 12% 2	126470
Seeing	Day	16% 10% 31% 27% 14% 3	17389
	Night	15% 9% 33% 32% 11% 1	27203

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	8% 13% 4 12% 10% 6% 5% 5% 6% 7% 25%	3460
	11th to 20th	Day	6% 9% 5% 12% 8% 7% 7% 8% 10% 6% 22%	3737
	21st to end	Day	4 14% 7% 12% 6% 5% 5% 4 5% 6% 32%	4488
February	1st to 10th	Day	9% 11% 5% 9% 7% 7% 4 5% 5% 6% 32%	1800
	11th to 20th	Day	7% 10% 4 11% 7% 5% 5% 4 6% 6% 35%	1754
	21st to end	Day	9% 12% 3 10% 6% 5% 5% 4 5% 7% 35%	1499
March	1st to 10th	Day	11% 9% 3 7% 4 3 4 3 5% 8% 43%	4934
	11th to 20th	Day	9% 9% 3 8% 5% 4 4 3 5% 7% 41%	4980
	21st to end	Day	20% 12% 4 9% 6% 5% 4 3 5% 6% 26%	5462
April	1st to 10th	Day	17% 10% 3 7% 4 4 4 4 5% 7% 36%	2388
	11th to 20th	Day	17% 12% 4 9% 5% 4 4 3 4 6% 32%	2450
	21st to end	Day	23% 10% 2 7% 5% 4 4 4 4 6% 32%	2600
May	1st to 10th	Day	13% 5% 2 6% 3 4 4 3 5% 6% 49%	6033
	11th to 20th	Day	17% 8% 2 5% 3 4 3 2 5% 6% 43%	6319
	21st to end	Day	16% 7% 2 6% 4 5% 5% 4 6% 7% 37%	6935
June	1st to 10th	Day	10% 5% 2 6% 4 4 4 5% 6% 8% 45%	2800
	11th to 20th	Day	13% 7% 3 7% 5% 5% 4 4 6% 8% 37%	2986
	21st to end	Day	10% 5% 2 6% 5% 5% 5% 4 7% 10% 42%	3000
July	1st to 10th	Day	7% 4 2 5% 4 5% 5% 5% 7% 11% 45%	6800
	11th to 20th	Day	8% 4 1 4 3 3 4 3 6% 9% 55%	6434
	21st to end	Day	7% 5% 2 6% 4 5% 5% 3 7% 10% 47%	6744
August	1st to 10th	Day	12% 6% 2 6% 4 4 5% 4 6% 7% 44%	4234
	11th to 20th	Day	11% 5% 2 6% 5% 5% 5% 4 7% 10% 41%	4171
	21st to end	Day	9% 6% 2 6% 4 4 4 4 6% 8% 48%	4548
September	1st to 10th	Day	9% 4 2 5% 4 4 4 4 6% 8% 49%	2400
	11th to 20th	Day	11% 4 2 6% 4 5% 5% 4 6% 7% 45%	2311
	21st to end	Day	14% 6% 2 5% 3 4 4 4 5% 6% 47%	2140
October	1st to 10th	Day	16% 6% 2 6% 5% 3 4 4 5% 7% 43%	2000
	11th to 20th	Day	15% 10% 3 7% 4 4 4 4 4 7% 39%	1980
	21st to end	Day	16% 10% 3 7% 4 4 4 3 4 6% 38%	2090
November	1st to 10th	Day	14% 12% 3 7% 6% 4 4 4 5% 6% 36%	1595
	11th to 20th	Day	9% 13% 7% 11% 7% 5% 4 3 5% 7% 30%	1600
	21st to end	Day	12% 10% 3 8% 4 5% 5% 3 6% 7% 36%	1600
December	1st to 10th	Day	7% 9% 4 11% 10% 8% 7% 5% 7% 7% 26%	2610
	11th to 20th	Day	9% 15% 7% 10% 6% 4 4 4 5% 6% 30%	3008
	21st to end	Day	19% 19% 6% 20% 6% 3 3 2 4 4 16%	3932
January	1st to 10th	Night	7% 10% 4 15% 9% 6% 4 3 5% 6% 30%	6357
	11th to 20th	Night	6% 11% 4 10% 7% 7% 9% 7% 8% 6% 24%	6240
	21st to end	Night	6% 16% 7% 10% 5% 4 5% 3 6% 6% 32%	6490
February	1st to 10th	Night	7% 11% 4 10% 6% 5% 5% 4 6% 6% 36%	2600
	11th to 20th	Night	6% 8% 4 9% 5% 5% 5% 4 5% 8% 40%	2533
	21st to end	Night	11% 10% 3 7% 4 4 5% 4 6% 7% 37%	2130
March	1st to 10th	Night	9% 8% 2 6% 4 4 4 3 5% 8% 48%	4963
	11th to 20th	Night	10% 7% 3 6% 4 4 5% 4 7% 10% 41%	4980
	21st to end	Night	23% 12% 4 11% 4 4 4 3 4 4 28%	5467
April	1st to 10th	Night	15% 10% 3 7% 4 4 4 4 5% 6% 39%	2011
	11th to 20th	Night	17% 11% 4 7% 4 3 4 4 6% 5% 36%	1897
	21st to end	Night	20% 11% 4 5% 4 4 4 3 4 6% 36%	1800
May	1st to 10th	Night	11% 6% 2 6% 4 3 3 3 4 5% 54%	3879
	11th to 20th	Night	14% 6% 2 5% 3 3 4 3 4 7% 48%	3596
	21st to end	Night	16% 8% 3 6% 4 3 4 3 6% 8% 39%	3942
June	1st to 10th	Night	11% 5% 2 4 3 4 6% 4 6% 9% 47%	1600
	11th to 20th	Night	10% 5% 2 5% 4 4 4 4 5% 9% 47%	1408
	21st to end	Night	9% 4 2 4 4 3 4 4 6% 7% 52%	1400
July	1st to 10th	Night	8% 4 1 5% 3 4 4 4 6% 9% 51%	3178
	11th to 20th	Night	6% 3 2 5% 3 3 3 3 5% 9% 57%	3528
	21st to end	Night	7% 5% 2 5% 4 5% 5% 4 6% 7% 49%	4123
August	1st to 10th	Night	10% 7% 2 6% 3 4 4 3 5% 7% 49%	2926
	11th to 20th	Night	13% 5% 2 5% 3 4 4 3 6% 8% 48%	2888
	21st to end	Night	9% 6% 3 6% 4 4 4 3 6% 8% 49%	3357
September	1st to 10th	Night	8% 4 1 5% 3 3 4 3 6% 8% 55%	2000
	11th to 20th	Night	9% 6% 2 4 3 3 3 4 6% 7% 53%	2085
	21st to end	Night	11% 5% 2 5% 3 3 3 3 5% 6% 54%	2240
October	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 4 7% 51%	2400
	11th to 20th	Night	15% 8% 3 6% 4 4 4 3 5% 7% 42%	2377
	21st to end	Night	18% 9% 4 7% 4 3 4 3 4 6% 39%	2508
November	1st to 10th	Night	12% 9% 3 5% 5% 4 4 4 5% 8% 41%	2698
	11th to 20th	Night	12% 12% 4 11% 4 4 4 4 5% 6% 35%	2800
	21st to end	Night	12% 9% 4 8% 5% 4 4 3 6% 6% 39%	2800
December	1st to 10th	Night	6% 7% 4 12% 8% 6% 5% 5% 7% 8% 32%	4580
	11th to 20th	Night	10% 14% 6% 13% 7% 5% 5% 4 5% 6% 26%	5199
	21st to end	Night	19% 16% 6% 17% 6% 4 4 3 3 4 18%	6996

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	57% 7% 9% 16% 10%	3461
	11th to 20th	Day	55% 6% 10% 19% 9%	3737
	21st to end	Day	53% 6% 15% 17% 9%	4488
February	1st to 10th	Day	51% 6% 12% 21% 8% 1	1800
	11th to 20th	Day	49% 6% 13% 24% 8% 1	1763
	21st to end	Day	48% 7% 13% 21% 11%	1499
March	1st to 10th	Day	39% 5% 16% 26% 10% 3	4934
	11th to 20th	Day	41% 5% 13% 29% 10% 1	4980
	21st to end	Day	58% 6% 10% 18% 7%	5464
April	1st to 10th	Day	48% 6% 11% 21% 13% 1	2388
	11th to 20th	Day	53% 6% 11% 17% 11% 2	2450
	21st to end	Day	53% 6% 12% 20% 10% 1	2600
May	1st to 10th	Day	35% 5% 13% 27% 18% 1	6071
	11th to 20th	Day	40% 6% 8% 24% 15% 7%	6323
	21st to end	Day	42% 8% 11% 30% 9% 1	6949
June	1st to 10th	Day	34% 8% 14% 30% 12% 1	2800
	11th to 20th	Day	44% 8% 14% 20% 13% 1	2986
	21st to end	Day	34% 9% 17% 27% 11% 2	3000
July	1st to 10th	Day	31% 7% 20% 31% 10%	6726
	11th to 20th	Day	26% 5% 17% 37% 13% 1	6357
	21st to end	Day	32% 6% 16% 31% 14% 1	6551
August	1st to 10th	Day	38% 6% 13% 29% 12% 2	4220
	11th to 20th	Day	37% 6% 15% 33% 9%	4210
	21st to end	Day	34% 6% 18% 28% 13% 1	4547
September	1st to 10th	Day	31% 6% 16% 34% 12%	2400
	11th to 20th	Day	37% 7% 18% 29% 9%	2311
	21st to end	Day	37% 6% 11% 34% 11% 1	2140
October	1st to 10th	Day	31% 4 9% 33% 22% 1	3260
	11th to 20th	Day	37% 6% 13% 24% 19% 1	3220
	21st to end	Day	45% 3 14% 28% 9%	3428
November	1st to 10th	Day	48% 6% 12% 20% 12% 3	1595
	11th to 20th	Day	54% 6% 13% 17% 10% 1	1600
	21st to end	Day	47% 7% 16% 21% 8% 2	1600
December	1st to 10th	Day	54% 8% 15% 17% 5% 1	2610
	11th to 20th	Day	55% 5% 15% 18% 7%	3005
	21st to end	Day	74% 5% 7% 9% 5%	3932
January	1st to 10th	Night	54% 6% 10% 20% 9%	6357
	11th to 20th	Night	55% 7% 10% 16% 11% 1	6240
	21st to end	Night	51% 6% 12% 25% 6%	6490
February	1st to 10th	Night	48% 5% 13% 21% 11% 1	2600
	11th to 20th	Night	41% 7% 15% 25% 11% 2	2534
	21st to end	Night	45% 6% 14% 21% 13% 2	2130
March	1st to 10th	Night	34% 6% 13% 29% 16% 2	4963
	11th to 20th	Night	36% 5% 15% 29% 14%	4980
	21st to end	Night	60% 4 9% 18% 9% 1	5467
April	1st to 10th	Night	45% 6% 11% 24% 12% 1	2011
	11th to 20th	Night	47% 6% 8% 21% 15% 2	1897
	21st to end	Night	50% 6% 8% 20% 14% 2	1800
May	1st to 10th	Night	32% 5% 11% 30% 19% 2	3906
	11th to 20th	Night	36% 5% 10% 21% 20% 8%	3597
	21st to end	Night	42% 6% 11% 27% 12% 1	3950
June	1st to 10th	Night	30% 9% 15% 29% 15% 2	1600
	11th to 20th	Night	33% 7% 16% 25% 16% 2	1408
	21st to end	Night	28% 8% 16% 28% 17% 4	1400
July	1st to 10th	Night	29% 6% 20% 28% 16% 1	3145
	11th to 20th	Night	24% 5% 17% 38% 14% 2	3486
	21st to end	Night	33% 6% 17% 30% 12% 2	4005
August	1st to 10th	Night	35% 6% 13% 28% 13% 5%	2916
	11th to 20th	Night	34% 6% 14% 32% 13% 1	2915
	21st to end	Night	33% 6% 18% 29% 13% 2	3357
September	1st to 10th	Night	26% 7% 16% 34% 17% 1	2000
	11th to 20th	Night	30% 7% 17% 30% 17%	2085
	21st to end	Night	32% 5% 12% 34% 17% 1	2240
October	1st to 10th	Night	23% 3 7% 37% 26% 4	3920
	11th to 20th	Night	33% 4 13% 25% 22% 3	3876
	21st to end	Night	42% 5% 13% 28% 12% 1	4120
November	1st to 10th	Night	40% 6% 14% 25% 12% 2	2698
	11th to 20th	Night	51% 6% 12% 19% 12% 1	2800
	21st to end	Night	46% 6% 17% 23% 7% 2	2800
December	1st to 10th	Night	48% 7% 19% 20% 6%	4580
	11th to 20th	Night	59% 6% 10% 19% 5% 1	5201
	21st to end	Night	70% 5% 8% 13% 4	6996

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	13% 11% 34% 27% 12% 3	300
	11th to 20th	Day	16% 9% 38% 32% 4 1	300
	21st to end	Day	13% 9% 42% 22% 13% 1	330
February	1st to 10th	Day	13% 16% 42% 24% 4	300
	11th to 20th	Day	15% 15% 39% 25% 6% 1	300
	21st to end	Day	15% 12% 42% 27% 4	249
March	1st to 10th	Day	20% 10% 41% 23% 5% 1	300
	11th to 20th	Day	19% 11% 37% 25% 7% 1	300
	21st to end	Day	25% 14% 27% 23% 9% 2	330
April	1st to 10th	Day	25% 14% 33% 22% 6%	488
	11th to 20th	Day	26% 15% 28% 21% 8% 1	568
	21st to end	Day	24% 12% 33% 20% 9% 2	700
May	1st to 10th	Day	19% 13% 31% 23% 12% 2	703
	11th to 20th	Day	20% 10% 28% 25% 14% 3	725
	21st to end	Day	17% 8% 29% 30% 14% 2	789
June	1st to 10th	Day	10% 8% 27% 31% 20% 4	730
	11th to 20th	Day	15% 7% 37% 29% 11% 1	730
	21st to end	Day	12% 9% 31% 28% 16% 4	730
July	1st to 10th	Day	8% 4 22% 33% 24% 9%	721
	11th to 20th	Day	8% 7% 27% 29% 21% 7%	718
	21st to end	Day	6% 4 26% 36% 24% 5%	794
August	1st to 10th	Day	11% 4 22% 33% 25% 5%	726
	11th to 20th	Day	13% 6% 21% 33% 23% 5%	715
	21st to end	Day	10% 6% 24% 34% 21% 5%	728
September	1st to 10th	Day	11% 8% 30% 29% 17% 5%	530
	11th to 20th	Day	12% 5% 27% 33% 19% 5%	441
	21st to end	Day	18% 10% 28% 20% 15% 9%	330
October	1st to 10th	Day	18% 12% 27% 25% 14% 5%	330
	11th to 20th	Day	19% 15% 36% 23% 7% 1	324
	21st to end	Day	23% 14% 36% 19% 6% 1	330
November	1st to 10th	Day	20% 15% 31% 24% 8% 2	300
	11th to 20th	Day	15% 21% 40% 21% 3	300
	21st to end	Day	20% 15% 40% 20% 5%	300
December	1st to 10th	Day	13% 12% 41% 24% 11%	300
	11th to 20th	Day	17% 15% 43% 21% 4	300
	21st to end	Day	28% 12% 36% 20% 3 1	330
January	1st to 10th	Night	9% 11% 39% 31% 9% 1	1000
	11th to 20th	Night	15% 10% 37% 30% 7% 1	1000
	21st to end	Night	17% 11% 37% 28% 7%	1100
February	1st to 10th	Night	13% 11% 39% 29% 7% 1	1000
	11th to 20th	Night	11% 11% 43% 28% 6% 1	979
	21st to end	Night	16% 11% 34% 30% 8% 1	810
March	1st to 10th	Night	16% 10% 39% 26% 9% 1	620
	11th to 20th	Night	17% 12% 38% 29% 4 1	600
	21st to end	Night	23% 9% 31% 26% 9% 2	660
April	1st to 10th	Night	20% 11% 37% 27% 6%	600
	11th to 20th	Night	21% 12% 31% 28% 8% 1	593
	21st to end	Night	24% 8% 31% 28% 8% 1	600
May	1st to 10th	Night	17% 11% 34% 29% 9% 1	600
	11th to 20th	Night	16% 8% 34% 32% 10% 1	591
	21st to end	Night	15% 8% 26% 36% 14% 1	650
June	1st to 10th	Night	12% 5% 29% 37% 16% 1	600
	11th to 20th	Night	13% 5% 31% 43% 9%	600
	21st to end	Night	10% 6% 24% 45% 15% 1	600
July	1st to 10th	Night	5% 4 23% 41% 26% 2	585
	11th to 20th	Night	8% 2 24% 47% 17% 1	582
	21st to end	Night	6% 2 23% 46% 22% 2	657
August	1st to 10th	Night	9% 4 19% 46% 21% 1	597
	11th to 20th	Night	13% 3 18% 41% 25% 2	594
	21st to end	Night	9% 4 25% 36% 24% 2	660
September	1st to 10th	Night	10% 4 27% 38% 19% 2	600
	11th to 20th	Night	11% 6% 30% 32% 21% 1	600
	21st to end	Night	13% 8% 32% 30% 15% 2	640
October	1st to 10th	Night	16% 9% 30% 32% 12% 1	800
	11th to 20th	Night	17% 11% 37% 27% 7% 1	793
	21st to end	Night	23% 11% 31% 27% 7%	836
November	1st to 10th	Night	17% 9% 34% 32% 7% 1	956
	11th to 20th	Night	17% 13% 37% 25% 7% 1	1000
	21st to end	Night	17% 13% 38% 25% 8%	1000
December	1st to 10th	Night	15% 11% 36% 30% 8% 1	1000
	11th to 20th	Night	18% 11% 38% 27% 7% 1	1000
	21st to end	Night	26% 9% 33% 26% 5% 1	1100

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