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 2024-01-12.

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% 8% 3 7% 6% 3 5% 5% 5% 7% 38%	75151
	Night	12% 8% 4 7% 5% 3 4 4 5% 7% 40%	74493
Transparency	Day	44% 7% 14% 23% 10% 1	74848
	Night	43% 7% 13% 24% 12% 2	74317
Seeing	Day	16% 9% 30% 27% 14% 3	14851
	Night	15% 9% 33% 32% 11% 1	24879

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	7% 11% 5% 8% 8% 5% 7% 7% 6% 8% 28%	1447
	11th to 20th	Day	10% 14% 6% 11% 8% 4 6% 4 5% 6% 25%	1500
	21st to end	Day	8% 12% 6% 11% 8% 5% 7% 7% 6% 7% 22%	1782
February	1st to 10th	Day	9% 10% 5% 7% 8% 5% 5% 6% 5% 6% 33%	1620
	11th to 20th	Day	8% 11% 5% 10% 8% 4 5% 5% 6% 6% 33%	1574
	21st to end	Day	10% 11% 4 10% 7% 4 6% 5% 4 7% 31%	1344
March	1st to 10th	Day	13% 11% 5% 8% 7% 3 5% 4 6% 6% 33%	1978
	11th to 20th	Day	14% 9% 4 7% 5% 4 4 4 4 6% 38%	1980
	21st to end	Day	18% 11% 5% 7% 5% 3 4 4 6% 6% 30%	2178
April	1st to 10th	Day	17% 9% 4 8% 4 3 4 5% 4 7% 35%	2148
	11th to 20th	Day	18% 11% 5% 7% 6% 3 4 4 4 6% 32%	2202
	21st to end	Day	23% 9% 3 6% 5% 3 4 5% 4 6% 32%	2340
May	1st to 10th	Day	18% 8% 3 7% 5% 4 4 5% 6% 6% 35%	2399
	11th to 20th	Day	16% 7% 3 5% 6% 3 5% 3 6% 8% 38%	2479
	21st to end	Day	14% 6% 2 6% 5% 4 6% 5% 6% 7% 38%	2725
June	1st to 10th	Day	11% 5% 3 5% 5% 3 5% 5% 6% 8% 45%	2520
	11th to 20th	Day	12% 6% 3 6% 5% 4 5% 5% 6% 8% 39%	2686
	21st to end	Day	9% 4 2 5% 5% 3 5% 6% 7% 10% 43%	2700
July	1st to 10th	Day	6% 3 1 4 4 3 5% 5% 6% 11% 51%	2700
	11th to 20th	Day	8% 4 2 4 4 3 5% 5% 6% 8% 52%	2555
	21st to end	Day	5% 3 2 4 6% 3 5% 5% 6% 11% 50%	2672
August	1st to 10th	Day	8% 5% 2 6% 7% 4 6% 6% 6% 9% 42%	2328
	11th to 20th	Day	13% 4 2 5% 5% 3 4 5% 6% 8% 45%	2301
	21st to end	Day	9% 5% 2 4 4 3 4 4 5% 8% 53%	2507
September	1st to 10th	Day	10% 4 2 5% 5% 3 5% 5% 6% 8% 49%	2160
	11th to 20th	Day	12% 4 2 5% 5% 4 6% 5% 6% 7% 45%	2081
	21st to end	Day	15% 6% 2 5% 4 3 4 5% 5% 7% 43%	1926
October	1st to 10th	Day	18% 7% 2 5% 5% 3 3 5% 5% 7% 41%	1800
	11th to 20th	Day	15% 9% 3 6% 5% 3 4 5% 4 7% 39%	1800
	21st to end	Day	17% 10% 4 6% 5% 3 4 4 4 6% 37%	1980
November	1st to 10th	Day	13% 11% 4 6% 6% 3 4 5% 5% 6% 37%	1515
	11th to 20th	Day	9% 12% 7% 10% 7% 4 5% 4 4 7% 30%	1520
	21st to end	Day	13% 10% 3 7% 5% 3 5% 4 6% 8% 36%	1520
December	1st to 10th	Day	10% 11% 5% 9% 10% 5% 6% 6% 6% 6% 27%	1520
	11th to 20th	Day	11% 13% 7% 10% 8% 4 4 5% 4 6% 30%	1918
	21st to end	Day	22% 15% 5% 14% 6% 3 3 3 4 5% 20%	2746
January	1st to 10th	Night	8% 9% 6% 10% 9% 5% 5% 5% 6% 7% 32%	2657
	11th to 20th	Night	11% 12% 6% 9% 7% 4 6% 4 6% 7% 28%	2497
	21st to end	Night	11% 13% 5% 9% 8% 3 5% 5% 6% 7% 26%	2574
February	1st to 10th	Night	6% 10% 5% 8% 7% 4 6% 6% 6% 6% 37%	2340
	11th to 20th	Night	7% 7% 5% 8% 6% 4 5% 5% 5% 9% 40%	2273
	21st to end	Night	12% 10% 4 7% 5% 4 5% 5% 6% 7% 35%	1911
March	1st to 10th	Night	12% 10% 3 7% 6% 3 5% 5% 5% 8% 37%	1998
	11th to 20th	Night	13% 10% 4 6% 4 3 4 3 4 6% 43%	1980
	21st to end	Night	16% 10% 4 7% 5% 3 5% 4 5% 7% 35%	2178
April	1st to 10th	Night	15% 10% 3 6% 5% 3 4 5% 5% 6% 39%	1811
	11th to 20th	Night	18% 11% 4 6% 4 2 3 5% 5% 5% 35%	1706
	21st to end	Night	19% 10% 4 5% 5% 2 4 4 4 6% 36%	1620
May	1st to 10th	Night	17% 8% 2 6% 5% 3 4 3 5% 6% 41%	1558
	11th to 20th	Night	14% 5% 3 6% 5% 3 5% 4 5% 9% 42%	1416
	21st to end	Night	12% 5% 3 6% 4 3 4 4 6% 8% 45%	1551
June	1st to 10th	Night	11% 4 2 3 4 3 5% 6% 5% 9% 48%	1440
	11th to 20th	Night	10% 5% 2 4 4 3 4 5% 5% 9% 49%	1268
	21st to end	Night	7% 4 2 4 4 3 4 5% 6% 7% 54%	1260
July	1st to 10th	Night	3 3 1 3 3 3 4 4 6% 10% 59%	1260
	11th to 20th	Night	6% 3 2 3 3 2 3 4 5% 9% 60%	1403
	21st to end	Night	3 3 1 4 3 3 4 4 6% 8% 60%	1642
August	1st to 10th	Night	7% 5% 2 5% 4 3 4 6% 6% 9% 51%	1611
	11th to 20th	Night	11% 4 1 5% 3 2 4 4 5% 7% 54%	1600
	21st to end	Night	8% 4 1 4 4 3 3 3 4 7% 59%	1849
September	1st to 10th	Night	8% 4 1 4 4 3 4 4 6% 8% 55%	1800
	11th to 20th	Night	9% 5% 2 4 4 2 3 4 6% 7% 54%	1876
	21st to end	Night	13% 5% 2 5% 5% 2 4 3 5% 7% 51%	2016
October	1st to 10th	Night	14% 6% 2 4 4 2 4 4 4 7% 49%	2160
	11th to 20th	Night	15% 7% 3 5% 4 3 4 4 5% 7% 42%	2160
	21st to end	Night	18% 8% 4 6% 5% 2 4 4 4 6% 40%	2376
November	1st to 10th	Night	12% 8% 3 5% 5% 3 4 5% 5% 8% 42%	2559
	11th to 20th	Night	12% 11% 5% 10% 5% 3 4 4 5% 6% 35%	2660
	21st to end	Night	13% 8% 4 7% 6% 3 5% 4 5% 7% 40%	2660
December	1st to 10th	Night	10% 10% 5% 9% 8% 5% 5% 5% 5% 7% 32%	2660
	11th to 20th	Night	11% 11% 5% 9% 8% 4 5% 5% 5% 7% 28%	3279
	21st to end	Night	21% 14% 5% 11% 7% 3 4 4 4 5% 22%	4884

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	53% 9% 14% 19% 6%	1448
	11th to 20th	Day	60% 7% 11% 15% 7%	1500
	21st to end	Day	60% 7% 12% 14% 7%	1782
February	1st to 10th	Day	49% 7% 13% 21% 8% 1	1620
	11th to 20th	Day	51% 6% 13% 21% 8% 1	1583
	21st to end	Day	52% 7% 11% 19% 11%	1344
March	1st to 10th	Day	52% 6% 14% 19% 7% 1	1978
	11th to 20th	Day	48% 6% 14% 24% 8% 1	1980
	21st to end	Day	55% 7% 11% 21% 6%	2178
April	1st to 10th	Day	48% 7% 11% 20% 12% 1	2148
	11th to 20th	Day	54% 6% 10% 17% 11% 2	2202
	21st to end	Day	53% 6% 12% 19% 9% 1	2340
May	1st to 10th	Day	49% 6% 13% 20% 10% 1	2399
	11th to 20th	Day	45% 7% 12% 24% 12% 1	2483
	21st to end	Day	43% 8% 13% 22% 11% 2	2725
June	1st to 10th	Day	35% 8% 15% 29% 11% 1	2520
	11th to 20th	Day	41% 9% 14% 21% 14% 1	2686
	21st to end	Day	33% 9% 18% 28% 10% 2	2700
July	1st to 10th	Day	25% 8% 18% 32% 16% 1	2626
	11th to 20th	Day	29% 8% 15% 26% 18% 3	2478
	21st to end	Day	28% 9% 16% 30% 16% 2	2523
August	1st to 10th	Day	37% 9% 17% 26% 9% 3	2314
	11th to 20th	Day	35% 8% 16% 30% 11%	2301
	21st to end	Day	29% 7% 15% 32% 16% 2	2507
September	1st to 10th	Day	32% 7% 15% 34% 13%	2160
	11th to 20th	Day	36% 8% 17% 30% 9%	2081
	21st to end	Day	39% 7% 12% 33% 8% 1	1926
October	1st to 10th	Day	43% 6% 13% 26% 13% 1	1800
	11th to 20th	Day	44% 6% 14% 23% 11% 2	1800
	21st to end	Day	49% 5% 13% 24% 9%	1980
November	1st to 10th	Day	47% 6% 12% 19% 13% 3	1515
	11th to 20th	Day	54% 6% 13% 16% 10%	1520
	21st to end	Day	46% 7% 16% 21% 8% 2	1520
December	1st to 10th	Day	56% 8% 14% 16% 6%	1520
	11th to 20th	Day	55% 6% 17% 18% 4	1915
	21st to end	Day	67% 6% 9% 12% 6%	2746
January	1st to 10th	Night	50% 7% 13% 20% 10% 1	2657
	11th to 20th	Night	55% 7% 14% 16% 8% 1	2497
	21st to end	Night	56% 7% 12% 17% 7% 1	2574
February	1st to 10th	Night	47% 6% 14% 21% 11% 1	2340
	11th to 20th	Night	41% 7% 15% 24% 11% 2	2274
	21st to end	Night	47% 6% 13% 20% 13% 2	1911
March	1st to 10th	Night	46% 7% 16% 23% 8%	1998
	11th to 20th	Night	44% 5% 14% 22% 14% 1	1980
	21st to end	Night	50% 7% 11% 24% 7% 1	2178
April	1st to 10th	Night	45% 6% 12% 24% 12% 1	1811
	11th to 20th	Night	49% 6% 8% 20% 15% 2	1706
	21st to end	Night	49% 6% 8% 20% 14% 2	1620
May	1st to 10th	Night	44% 6% 13% 23% 14% 1	1558
	11th to 20th	Night	41% 7% 12% 23% 15% 2	1417
	21st to end	Night	36% 7% 15% 24% 16% 2	1552
June	1st to 10th	Night	30% 9% 15% 29% 15% 2	1440
	11th to 20th	Night	31% 8% 16% 26% 16% 2	1268
	21st to end	Night	26% 9% 16% 28% 17% 4	1260
July	1st to 10th	Night	21% 8% 16% 34% 19% 1	1225
	11th to 20th	Night	22% 6% 16% 34% 17% 4	1358
	21st to end	Night	20% 7% 17% 34% 17% 5%	1551
August	1st to 10th	Night	29% 9% 15% 30% 13% 4	1601
	11th to 20th	Night	29% 7% 17% 29% 16% 1	1600
	21st to end	Night	26% 7% 15% 31% 19% 3	1849
September	1st to 10th	Night	26% 7% 15% 34% 17% 1	1800
	11th to 20th	Night	29% 7% 16% 30% 17%	1876
	21st to end	Night	34% 5% 13% 33% 15% 1	2016
October	1st to 10th	Night	37% 5% 11% 31% 15% 2	2160
	11th to 20th	Night	42% 6% 13% 24% 14% 2	2160
	21st to end	Night	47% 6% 12% 23% 11% 1	2376
November	1st to 10th	Night	40% 7% 14% 25% 13% 2	2559
	11th to 20th	Night	51% 6% 12% 18% 12% 1	2660
	21st to end	Night	44% 6% 18% 23% 7% 2	2660
December	1st to 10th	Night	52% 6% 15% 19% 7%	2660
	11th to 20th	Night	54% 9% 12% 17% 6% 2	3281
	21st to end	Night	65% 6% 10% 15% 4	4884

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	14% 11% 33% 27% 13% 2	270
	11th to 20th	Day	18% 9% 33% 35% 4 1	245
	21st to end	Day	15% 8% 43% 22% 12% 1	264
February	1st to 10th	Day	13% 16% 44% 23% 4	240
	11th to 20th	Day	17% 16% 40% 22% 4 1	240
	21st to end	Day	17% 12% 40% 26% 5%	198
March	1st to 10th	Day	22% 11% 37% 23% 6% 2	240
	11th to 20th	Day	20% 9% 35% 26% 8% 2	240
	21st to end	Day	25% 14% 23% 25% 10% 3	264
April	1st to 10th	Day	25% 14% 33% 22% 7%	408
	11th to 20th	Day	28% 13% 26% 23% 10% 1	480
	21st to end	Day	24% 12% 34% 19% 10% 2	600
May	1st to 10th	Day	21% 12% 32% 24% 10% 1	603
	11th to 20th	Day	19% 11% 29% 24% 14% 3	625
	21st to end	Day	17% 8% 29% 30% 15% 3	679
June	1st to 10th	Day	10% 7% 27% 31% 22% 4	630
	11th to 20th	Day	13% 7% 37% 31% 12% 1	630
	21st to end	Day	10% 9% 29% 30% 17% 5%	630
July	1st to 10th	Day	7% 4 23% 33% 24% 8%	621
	11th to 20th	Day	9% 7% 28% 29% 21% 7%	618
	21st to end	Day	6% 4 24% 37% 24% 5%	684
August	1st to 10th	Day	11% 3 20% 34% 27% 4	626
	11th to 20th	Day	13% 5% 21% 33% 22% 5%	615
	21st to end	Day	10% 6% 23% 35% 21% 5%	626
September	1st to 10th	Day	12% 8% 30% 29% 18% 4	450
	11th to 20th	Day	12% 4 28% 31% 19% 5%	371
	21st to end	Day	21% 11% 31% 19% 11% 6%	270
October	1st to 10th	Day	20% 11% 26% 23% 14% 6%	270
	11th to 20th	Day	15% 17% 36% 22% 8% 1	270
	21st to end	Day	23% 14% 37% 18% 6% 1	297
November	1st to 10th	Day	19% 14% 31% 25% 9% 2	270
	11th to 20th	Day	14% 20% 40% 22% 3	270
	21st to end	Day	21% 14% 41% 19% 5%	270
December	1st to 10th	Day	13% 12% 40% 24% 11%	270
	11th to 20th	Day	18% 14% 44% 20% 4	270
	21st to end	Day	29% 13% 35% 20% 3	297
January	1st to 10th	Night	10% 11% 39% 30% 9% 1	950
	11th to 20th	Night	16% 9% 35% 31% 7% 1	910
	21st to end	Night	18% 10% 36% 28% 7%	990
February	1st to 10th	Night	11% 11% 40% 30% 7% 1	900
	11th to 20th	Night	12% 11% 42% 28% 6% 1	879
	21st to end	Night	17% 11% 33% 29% 8% 1	727
March	1st to 10th	Night	16% 10% 37% 26% 10% 1	558
	11th to 20th	Night	18% 10% 37% 30% 5% 1	540
	21st to end	Night	22% 10% 31% 27% 9% 2	594
April	1st to 10th	Night	19% 10% 39% 26% 6%	540
	11th to 20th	Night	22% 11% 30% 28% 9% 1	533
	21st to end	Night	23% 8% 30% 28% 9% 1	540
May	1st to 10th	Night	19% 9% 35% 29% 8%	540
	11th to 20th	Night	16% 8% 34% 31% 10% 1	531
	21st to end	Night	15% 7% 28% 35% 15% 1	584
June	1st to 10th	Night	13% 4 28% 38% 17% 1	540
	11th to 20th	Night	12% 5% 31% 43% 9%	540
	21st to end	Night	7% 6% 24% 46% 17% 1	540
July	1st to 10th	Night	4 4 24% 40% 27% 2	525
	11th to 20th	Night	8% 2 25% 47% 17% 1	522
	21st to end	Night	5% 2 23% 46% 21% 2	591
August	1st to 10th	Night	8% 3 18% 48% 22% 1	537
	11th to 20th	Night	12% 3 17% 41% 25% 2	534
	21st to end	Night	9% 3 26% 36% 25% 2	594
September	1st to 10th	Night	10% 4 27% 38% 19% 2	540
	11th to 20th	Night	11% 6% 29% 32% 20% 1	540
	21st to end	Night	14% 9% 34% 30% 13% 2	576
October	1st to 10th	Night	17% 8% 31% 31% 13% 1	720
	11th to 20th	Night	17% 11% 37% 27% 7% 1	720
	21st to end	Night	23% 11% 31% 27% 7%	792
November	1st to 10th	Night	16% 9% 34% 33% 8% 1	907
	11th to 20th	Night	17% 13% 37% 26% 7% 1	950
	21st to end	Night	16% 12% 38% 25% 9%	950
December	1st to 10th	Night	15% 11% 35% 29% 8% 1	950
	11th to 20th	Night	19% 9% 38% 27% 7% 1	950
	21st to end	Night	26% 10% 33% 26% 5% 1	1045

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