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 2024-11-06.

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% 7% 38%	102166
	Night	12% 9% 3 8% 5% 4 4 4 5% 7% 40%	96847
Transparency	Day	43% 7% 14% 25% 11% 1	105791
	Night	42% 6% 13% 25% 12% 2	101363
Seeing	Day	15% 10% 31% 27% 14% 3	16047
	Night	15% 9% 33% 32% 11% 1	25916

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% 17% 5% 13% 8% 6% 5% 4 5% 6% 21%	2409
	11th to 20th	Day	6% 9% 5% 14% 9% 7% 8% 6% 8% 5% 23%	2605
	21st to end	Day	6% 18% 8% 11% 6% 5% 6% 4 5% 6% 24%	3135
February	1st to 10th	Day	8% 11% 5% 9% 6% 7% 4 5% 5% 6% 33%	1710
	11th to 20th	Day	7% 11% 4 10% 7% 5% 5% 4 6% 6% 35%	1664
	21st to end	Day	9% 12% 3 10% 6% 5% 5% 4 5% 7% 34%	1426
March	1st to 10th	Day	11% 12% 4 9% 5% 4 4 3 5% 7% 36%	3434
	11th to 20th	Day	9% 9% 3 8% 5% 5% 4 3 5% 7% 42%	3480
	21st to end	Day	21% 13% 4 10% 7% 5% 4 3 5% 5% 23%	3814
April	1st to 10th	Day	17% 10% 3 7% 4 4 4 4 5% 7% 35%	2268
	11th to 20th	Day	18% 12% 4 9% 5% 4 4 3 4 6% 32%	2326
	21st to end	Day	23% 10% 3 6% 5% 3 4 4 4 6% 32%	2470
May	1st to 10th	Day	17% 6% 3 6% 4 5% 4 4 6% 7% 39%	4197
	11th to 20th	Day	13% 6% 3 6% 4 4 4 3 6% 7% 45%	4399
	21st to end	Day	17% 6% 2 7% 4 5% 5% 4 7% 8% 35%	4824
June	1st to 10th	Day	10% 5% 2 6% 4 4 4 4 6% 8% 46%	2660
	11th to 20th	Day	13% 7% 2 7% 5% 5% 4 4 6% 8% 38%	2836
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 4 7% 10% 42%	2850
July	1st to 10th	Day	9% 5% 2 6% 5% 5% 6% 5% 8% 11% 38%	4750
	11th to 20th	Day	5% 3 1 4 3 3 4 3 7% 9% 58%	4488
	21st to end	Day	5% 4 2 5% 5% 5% 5% 4 7% 10% 48%	4689
August	1st to 10th	Day	12% 6% 2 6% 4 4 5% 4 6% 7% 44%	4104
	11th to 20th	Day	11% 5% 2 5% 5% 5% 5% 4 7% 10% 41%	4041
	21st to end	Day	10% 6% 2 5% 4 4 4 3 5% 8% 48%	4409
September	1st to 10th	Day	9% 4 2 5% 4 4 4 4 6% 8% 51%	2280
	11th to 20th	Day	12% 4 2 6% 4 5% 5% 4 6% 7% 46%	2196
	21st to end	Day	15% 6% 2 5% 3 4 4 4 5% 7% 45%	2033
October	1st to 10th	Day	17% 7% 2 6% 5% 3 4 4 5% 7% 42%	1900
	11th to 20th	Day	14% 9% 2 7% 4 4 4 4 4 7% 39%	1900
	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% 5% 4 4 4 5% 6% 36%	1555
	11th to 20th	Day	9% 13% 7% 11% 7% 5% 4 3 5% 7% 29%	1520
	21st to end	Day	13% 10% 3 7% 4 5% 5% 3 6% 8% 36%	1520
December	1st to 10th	Day	10% 12% 4 10% 9% 6% 5% 5% 6% 6% 27%	1520
	11th to 20th	Day	10% 14% 6% 11% 6% 5% 4 4 4 6% 29%	1918
	21st to end	Day	21% 16% 4 16% 5% 3 3 2 4 5% 20%	2746
January	1st to 10th	Night	10% 14% 6% 16% 7% 4 4 3 5% 5% 28%	4437
	11th to 20th	Night	6% 12% 5% 13% 8% 7% 9% 6% 7% 6% 22%	4362
	21st to end	Night	8% 20% 8% 11% 5% 4 4 3 5% 5% 27%	4532
February	1st to 10th	Night	6% 11% 5% 10% 5% 5% 5% 4 6% 6% 37%	2470
	11th to 20th	Night	6% 8% 4 9% 5% 5% 5% 4 5% 9% 40%	2403
	21st to end	Night	11% 10% 3 7% 4 4 5% 4 6% 7% 37%	2027
March	1st to 10th	Night	8% 9% 2 7% 4 4 4 3 5% 8% 47%	3449
	11th to 20th	Night	9% 8% 3 7% 4 4 4 4 5% 7% 44%	3480
	21st to end	Night	24% 12% 3 10% 4 3 3 3 4 5% 28%	3817
April	1st to 10th	Night	15% 10% 3 6% 4 4 4 4 5% 6% 39%	1911
	11th to 20th	Night	18% 11% 4 7% 4 3 4 4 5% 5% 36%	1801
	21st to end	Night	19% 10% 4 5% 4 4 4 3 4 6% 36%	1710
May	1st to 10th	Night	14% 7% 2 7% 4 4 4 3 5% 6% 44%	2705
	11th to 20th	Night	14% 5% 2 5% 4 4 4 3 5% 8% 47%	2506
	21st to end	Night	16% 7% 3 6% 4 3 3 4 6% 8% 42%	2743
June	1st to 10th	Night	11% 4 2 4 3 4 6% 4 6% 9% 47%	1520
	11th to 20th	Night	10% 5% 2 5% 4 4 4 4 5% 9% 48%	1338
	21st to end	Night	8% 4 2 4 3 3 4 4 7% 7% 53%	1330
July	1st to 10th	Night	10% 4 2 5% 3 4 5% 5% 7% 10% 46%	2220
	11th to 20th	Night	4 3 2 3 3 3 3 3 5% 8% 63%	2467
	21st to end	Night	5% 3 2 4 3 4 4 3 6% 8% 57%	2870
August	1st to 10th	Night	10% 7% 2 6% 3 4 4 3 5% 7% 49%	2836
	11th to 20th	Night	13% 5% 2 5% 3 4 4 3 6% 8% 48%	2798
	21st to end	Night	9% 6% 3 6% 4 4 4 3 6% 8% 48%	3254
September	1st to 10th	Night	8% 4 1 5% 3 3 4 3 6% 8% 55%	1900
	11th to 20th	Night	9% 5% 2 4 3 3 3 4 6% 7% 54%	1981
	21st to end	Night	12% 5% 2 5% 4 3 3 3 5% 6% 53%	2128
October	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 4 7% 50%	2280
	11th to 20th	Night	14% 8% 3 6% 4 4 4 3 5% 7% 43%	2280
	21st to end	Night	18% 9% 4 7% 4 3 4 3 4 6% 39%	2508
November	1st to 10th	Night	12% 9% 3 6% 5% 4 4 4 5% 8% 41%	2641
	11th to 20th	Night	12% 12% 4 11% 4 4 4 4 5% 6% 35%	2660
	21st to end	Night	12% 9% 3 8% 5% 3 4 3 6% 6% 40%	2660
December	1st to 10th	Night	10% 10% 5% 10% 7% 6% 4 4 5% 7% 32%	2660
	11th to 20th	Night	11% 12% 5% 11% 7% 6% 5% 4 6% 6% 28%	3279
	21st to end	Night	21% 15% 5% 13% 5% 4 4 3 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	62% 9% 10% 16% 4	2410
	11th to 20th	Day	58% 8% 12% 18% 4	2605
	21st to end	Day	60% 8% 12% 16% 5%	3135
February	1st to 10th	Day	50% 7% 13% 22% 8% 1	1710
	11th to 20th	Day	49% 6% 13% 23% 8% 1	1673
	21st to end	Day	50% 7% 12% 20% 11%	1426
March	1st to 10th	Day	46% 7% 13% 25% 8% 1	3434
	11th to 20th	Day	41% 6% 11% 31% 10% 1	3480
	21st to end	Day	62% 8% 9% 17% 4	3814
April	1st to 10th	Day	48% 7% 11% 20% 13% 1	2268
	11th to 20th	Day	54% 6% 10% 18% 12% 2	2326
	21st to end	Day	53% 6% 12% 20% 9% 1	2470
May	1st to 10th	Day	41% 7% 14% 24% 14% 1	4235
	11th to 20th	Day	37% 7% 10% 29% 14% 2	4403
	21st to end	Day	43% 10% 13% 26% 8% 1	4837
June	1st to 10th	Day	34% 8% 15% 30% 12% 1	2660
	11th to 20th	Day	42% 8% 13% 20% 14% 1	2836
	21st to end	Day	34% 9% 17% 27% 10% 2	2850
July	1st to 10th	Day	37% 8% 20% 22% 12% 1	4676
	11th to 20th	Day	21% 6% 18% 37% 16% 2	4411
	21st to end	Day	30% 7% 16% 31% 15% 1	4541
August	1st to 10th	Day	38% 6% 13% 30% 12% 2	4090
	11th to 20th	Day	37% 7% 15% 33% 9%	4080
	21st to end	Day	34% 6% 18% 28% 13% 1	4408
September	1st to 10th	Day	30% 6% 16% 35% 12%	2280
	11th to 20th	Day	36% 7% 17% 30% 10%	2196
	21st to end	Day	37% 7% 11% 33% 11% 1	2033
October	1st to 10th	Day	32% 4 9% 33% 22%	3160
	11th to 20th	Day	36% 6% 13% 24% 19% 1	3140
	21st to end	Day	45% 3 14% 28% 9%	3428
November	1st to 10th	Day	48% 6% 12% 19% 12% 3	1555
	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	57% 7% 12% 18% 6% 1	4437
	11th to 20th	Night	59% 8% 12% 16% 5%	4362
	21st to end	Night	59% 6% 9% 20% 5% 1	4532
February	1st to 10th	Night	47% 6% 13% 22% 11% 1	2470
	11th to 20th	Night	40% 8% 15% 24% 11% 2	2404
	21st to end	Night	45% 6% 14% 20% 13% 2	2027
March	1st to 10th	Night	35% 7% 14% 27% 16% 2	3449
	11th to 20th	Night	36% 7% 12% 30% 15% 1	3480
	21st to end	Night	60% 5% 8% 20% 6% 1	3817
April	1st to 10th	Night	45% 6% 11% 24% 12% 1	1911
	11th to 20th	Night	48% 6% 8% 20% 16% 2	1801
	21st to end	Night	49% 6% 8% 20% 14% 2	1710
May	1st to 10th	Night	40% 7% 11% 24% 16% 2	2732
	11th to 20th	Night	34% 7% 11% 24% 20% 4	2507
	21st to end	Night	39% 7% 14% 25% 13% 1	2751
June	1st to 10th	Night	30% 9% 15% 29% 15% 2	1520
	11th to 20th	Night	32% 8% 16% 25% 17% 2	1338
	21st to end	Night	27% 9% 16% 28% 17% 4	1330
July	1st to 10th	Night	34% 7% 21% 23% 15% 1	2185
	11th to 20th	Night	19% 5% 15% 40% 18% 2	2422
	21st to end	Night	24% 6% 17% 34% 16% 3	2779
August	1st to 10th	Night	34% 6% 13% 28% 13% 6%	2826
	11th to 20th	Night	34% 6% 14% 32% 14% 1	2825
	21st to end	Night	33% 6% 18% 29% 12% 2	3254
September	1st to 10th	Night	25% 7% 16% 34% 17% 1	1900
	11th to 20th	Night	29% 7% 16% 31% 17%	1981
	21st to end	Night	32% 5% 12% 33% 17% 1	2128
October	1st to 10th	Night	23% 3 7% 37% 26% 4	3800
	11th to 20th	Night	32% 4 13% 26% 22% 3	3779
	21st to end	Night	42% 5% 13% 28% 12% 1	4120
November	1st to 10th	Night	40% 6% 14% 25% 13% 2	2641
	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	17% 9% 38% 31% 4 1	270
	21st to end	Day	13% 8% 41% 22% 14% 1	297
February	1st to 10th	Day	12% 16% 43% 24% 5%	270
	11th to 20th	Day	16% 16% 39% 24% 5% 1	270
	21st to end	Day	16% 12% 42% 26% 4	225
March	1st to 10th	Day	21% 11% 40% 21% 6% 1	270
	11th to 20th	Day	19% 10% 37% 25% 7% 1	270
	21st to end	Day	26% 13% 25% 25% 9% 2	297
April	1st to 10th	Day	25% 14% 33% 22% 6%	448
	11th to 20th	Day	27% 15% 27% 21% 9% 1	524
	21st to end	Day	24% 12% 34% 19% 9% 2	650
May	1st to 10th	Day	20% 13% 32% 23% 10% 1	653
	11th to 20th	Day	18% 10% 30% 25% 14% 3	675
	21st to end	Day	17% 8% 30% 29% 14% 3	734
June	1st to 10th	Day	10% 9% 26% 31% 21% 4	680
	11th to 20th	Day	14% 7% 37% 30% 11% 1	680
	21st to end	Day	11% 9% 30% 29% 17% 4	680
July	1st to 10th	Day	8% 4 23% 32% 24% 9%	671
	11th to 20th	Day	8% 7% 27% 28% 21% 8%	668
	21st to end	Day	6% 4 24% 36% 24% 6%	739
August	1st to 10th	Day	11% 4 21% 33% 25% 4	676
	11th to 20th	Day	12% 5% 20% 34% 23% 5%	665
	21st to end	Day	10% 6% 25% 34% 20% 5%	677
September	1st to 10th	Day	11% 8% 30% 30% 17% 4	490
	11th to 20th	Day	12% 4 27% 32% 19% 5%	406
	21st to end	Day	19% 11% 30% 19% 13% 7%	300
October	1st to 10th	Day	20% 11% 27% 23% 14% 5%	300
	11th to 20th	Day	16% 16% 37% 23% 7% 1	300
	21st to end	Day	23% 14% 36% 19% 6% 1	330
November	1st to 10th	Day	20% 15% 31% 24% 8% 2	285
	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% 10% 37% 30% 7% 1	950
	21st to end	Night	17% 11% 36% 28% 8%	1045
February	1st to 10th	Night	11% 11% 39% 30% 8% 1	950
	11th to 20th	Night	12% 11% 42% 28% 6% 1	929
	21st to end	Night	16% 10% 34% 30% 8% 1	771
March	1st to 10th	Night	16% 10% 39% 26% 9% 1	589
	11th to 20th	Night	17% 11% 37% 29% 5% 1	570
	21st to end	Night	22% 9% 31% 26% 9% 2	627
April	1st to 10th	Night	19% 10% 38% 27% 5%	570
	11th to 20th	Night	21% 11% 30% 28% 8% 1	563
	21st to end	Night	23% 8% 31% 28% 8% 1	570
May	1st to 10th	Night	18% 11% 34% 29% 8%	570
	11th to 20th	Night	15% 7% 34% 32% 10% 1	561
	21st to end	Night	15% 8% 27% 35% 14% 1	617
June	1st to 10th	Night	12% 4 29% 37% 16% 1	570
	11th to 20th	Night	12% 5% 31% 43% 9%	570
	21st to end	Night	8% 5% 24% 46% 16% 1	570
July	1st to 10th	Night	5% 4 23% 40% 26% 2	555
	11th to 20th	Night	8% 2 24% 47% 18% 1	552
	21st to end	Night	6% 2 22% 45% 22% 2	624
August	1st to 10th	Night	8% 4 19% 47% 21% 1	567
	11th to 20th	Night	12% 3 17% 41% 25% 2	564
	21st to end	Night	9% 3 26% 36% 24% 2	627
September	1st to 10th	Night	10% 3 27% 39% 19% 2	570
	11th to 20th	Night	11% 6% 29% 32% 21% 1	570
	21st to end	Night	13% 8% 33% 30% 14% 1	608
October	1st to 10th	Night	16% 9% 30% 31% 13% 1	760
	11th to 20th	Night	16% 11% 37% 28% 7% 1	760
	21st to end	Night	23% 11% 31% 27% 7%	836
November	1st to 10th	Night	17% 9% 34% 32% 8% 1	936
	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

Page generated at 2024-11-03 12:19:03. Version ac07

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