Otter Lake Scout Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Otter Lake Scout Camp clear sky chart from 2005-11-06 to 2024-01-27.

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	17% 9% 4 7% 6% 3 5% 5% 5% 7% 33%	74837
	Night	18% 10% 4 7% 6% 3 5% 4 5% 6% 33%	75204
Transparency	Day	50% 6% 11% 21% 11% 1	74542
	Night	51% 5% 11% 20% 11% 1	75033
Seeing	Day	24% 15% 31% 20% 8% 3	13417
	Night	23% 13% 30% 24% 9% 1	22737

By Month

Percentage Cloud Cover NE (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	16% 17% 6% 9% 8% 3 5% 4 3 5% 24%	1517
	11th to 20th	Day	19% 16% 6% 9% 7% 3 5% 3 4 4 24%	1520
	21st to end	Day	14% 15% 5% 11% 8% 4 5% 5% 5% 6% 22%	1773
February	1st to 10th	Day	16% 15% 5% 11% 6% 4 5% 5% 5% 5% 22%	1620
	11th to 20th	Day	13% 16% 5% 11% 7% 3 5% 5% 3 5% 27%	1573
	21st to end	Day	20% 15% 4 8% 7% 4 5% 4 4 5% 24%	1466
March	1st to 10th	Day	16% 12% 6% 9% 8% 4 5% 3 3 4 29%	1841
	11th to 20th	Day	16% 14% 5% 7% 7% 4 5% 4 4 5% 30%	1980
	21st to end	Day	20% 12% 3 6% 4 2 3 3 4 4 38%	2263
April	1st to 10th	Day	21% 12% 4 6% 5% 2 4 4 4 5% 33%	2160
	11th to 20th	Day	21% 8% 3 6% 4 3 4 4 4 5% 39%	2134
	21st to end	Day	22% 10% 3 7% 6% 3 4 4 4 5% 32%	2254
May	1st to 10th	Day	19% 8% 3 6% 5% 4 5% 5% 5% 7% 33%	2510
	11th to 20th	Day	17% 6% 3 6% 5% 3 5% 4 5% 8% 38%	2478
	21st to end	Day	14% 5% 3 6% 5% 4 5% 5% 7% 6% 40%	2725
June	1st to 10th	Day	20% 7% 3 6% 5% 3 4 6% 6% 7% 32%	2520
	11th to 20th	Day	17% 5% 2 5% 5% 3 5% 5% 6% 9% 39%	2520
	21st to end	Day	17% 8% 3 6% 6% 3 5% 5% 6% 8% 34%	2520
July	1st to 10th	Day	11% 5% 3 5% 5% 3 6% 6% 7% 8% 42%	2520
	11th to 20th	Day	12% 7% 2 5% 5% 3 6% 5% 7% 9% 38%	2520
	21st to end	Day	11% 5% 2 6% 6% 4 6% 6% 8% 9% 37%	2744
August	1st to 10th	Day	11% 6% 3 6% 6% 4 5% 5% 6% 9% 38%	2391
	11th to 20th	Day	11% 6% 2 6% 5% 4 4 8% 6% 9% 39%	2294
	21st to end	Day	14% 5% 3 5% 5% 3 5% 4 7% 9% 40%	2376
September	1st to 10th	Day	13% 5% 3 5% 5% 3 5% 5% 6% 8% 42%	2160
	11th to 20th	Day	13% 5% 3 4 5% 3 4 4 4 8% 48%	2160
	21st to end	Day	18% 5% 3 5% 5% 3 4 5% 5% 7% 40%	1907
October	1st to 10th	Day	21% 9% 2 6% 5% 4 3 4 4 6% 37%	1800
	11th to 20th	Day	22% 8% 4 7% 6% 3 4 5% 6% 7% 29%	1800
	21st to end	Day	27% 10% 3 6% 6% 3 5% 4 4 6% 26%	1886
November	1st to 10th	Day	16% 8% 3 7% 6% 4 4 6% 5% 7% 34%	1667
	11th to 20th	Day	18% 11% 5% 7% 7% 4 4 3 5% 6% 31%	1520
	21st to end	Day	21% 13% 5% 6% 7% 3 5% 5% 5% 5% 24%	1520
December	1st to 10th	Day	23% 16% 5% 9% 6% 3 4 3 5% 6% 20%	1520
	11th to 20th	Day	20% 15% 6% 8% 6% 3 5% 3 5% 4 25%	1906
	21st to end	Day	27% 16% 5% 10% 7% 3 3 4 3 3 20%	2772
January	1st to 10th	Night	19% 14% 6% 10% 8% 4 4 5% 4 5% 21%	2649
	11th to 20th	Night	17% 16% 5% 10% 8% 4 5% 5% 4 4 22%	2660
	21st to end	Night	14% 12% 5% 11% 8% 4 5% 4 5% 4 28%	2726
February	1st to 10th	Night	17% 13% 5% 10% 7% 4 6% 6% 5% 6% 22%	2340
	11th to 20th	Night	14% 12% 5% 9% 7% 4 5% 4 4 5% 30%	2273
	21st to end	Night	17% 12% 5% 8% 6% 4 5% 4 5% 6% 29%	1790
March	1st to 10th	Night	15% 12% 4 8% 6% 4 4 5% 5% 5% 32%	2102
	11th to 20th	Night	17% 13% 5% 7% 5% 2 4 3 4 6% 34%	1979
	21st to end	Night	17% 10% 4 7% 5% 2 4 3 4 5% 39%	2093
April	1st to 10th	Night	22% 9% 5% 6% 4 2 4 4 4 5% 35%	1800
	11th to 20th	Night	19% 8% 3 5% 6% 3 4 4 5% 5% 38%	1775
	21st to end	Night	21% 10% 3 6% 5% 4 4 4 6% 6% 32%	1720
May	1st to 10th	Night	22% 7% 3 5% 4 4 4 4 5% 6% 36%	1450
	11th to 20th	Night	13% 6% 4 6% 4 3 5% 5% 5% 7% 43%	1415
	21st to end	Night	12% 4 2 5% 5% 3 5% 5% 5% 9% 45%	1550
June	1st to 10th	Night	16% 6% 3 6% 6% 4 5% 6% 6% 7% 35%	1440
	11th to 20th	Night	14% 5% 3 5% 5% 3 4 5% 5% 8% 43%	1440
	21st to end	Night	16% 6% 2 6% 5% 3 6% 5% 5% 8% 38%	1440
July	1st to 10th	Night	10% 4 2 5% 4 3 6% 4 6% 9% 47%	1440
	11th to 20th	Night	12% 5% 3 4 5% 3 4 5% 6% 10% 43%	1440
	21st to end	Night	10% 5% 3 4 4 2 4 6% 6% 9% 48%	1574
August	1st to 10th	Night	9% 6% 2 4 6% 3 4 5% 6% 8% 46%	1544
	11th to 20th	Night	9% 7% 3 6% 5% 3 5% 4 6% 9% 44%	1598
	21st to end	Night	10% 5% 3 5% 5% 3 4 5% 7% 8% 45%	1970
September	1st to 10th	Night	11% 6% 3 6% 5% 3 4 4 5% 8% 46%	1800
	11th to 20th	Night	14% 4 2 4 3 2 4 4 5% 7% 51%	1800
	21st to end	Night	17% 6% 2 4 5% 3 3 4 5% 6% 44%	2048
October	1st to 10th	Night	17% 7% 4 6% 6% 3 4 5% 5% 6% 37%	2160
	11th to 20th	Night	21% 8% 4 6% 6% 3 5% 5% 5% 6% 31%	2160
	21st to end	Night	23% 9% 3 7% 6% 4 4 4 5% 6% 29%	2469
November	1st to 10th	Night	19% 9% 3 6% 5% 3 4 4 6% 6% 36%	2407
	11th to 20th	Night	18% 10% 3 6% 5% 3 6% 5% 5% 6% 33%	2660
	21st to end	Night	21% 11% 4 8% 6% 3 5% 5% 5% 7% 26%	2660
December	1st to 10th	Night	21% 15% 5% 9% 8% 3 4 4 5% 6% 20%	2660
	11th to 20th	Night	21% 15% 5% 7% 6% 3 4 3 3 4 27%	3288
	21st to end	Night	30% 14% 4 9% 6% 3 4 3 5% 4 17%	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% 7% 9% 16% 6% 1	1518
	11th to 20th	Day	65% 5% 9% 12% 10% 1	1520
	21st to end	Day	63% 6% 9% 12% 8% 2	1773
February	1st to 10th	Day	64% 4 9% 16% 6% 1	1620
	11th to 20th	Day	61% 4 9% 15% 9% 1	1582
	21st to end	Day	64% 5% 8% 12% 10% 1	1466
March	1st to 10th	Day	59% 3 10% 16% 9% 2	1844
	11th to 20th	Day	57% 5% 9% 15% 11% 2	1980
	21st to end	Day	51% 4 7% 19% 14% 6%	2263
April	1st to 10th	Day	55% 3 7% 19% 13% 4	2160
	11th to 20th	Day	48% 4 7% 23% 16% 2	2134
	21st to end	Day	55% 4 8% 17% 13% 4	2254
May	1st to 10th	Day	50% 5% 9% 17% 15% 3	2510
	11th to 20th	Day	44% 5% 10% 23% 16% 2	2482
	21st to end	Day	42% 6% 15% 22% 12% 3	2725
June	1st to 10th	Day	49% 7% 11% 20% 12% 1	2520
	11th to 20th	Day	41% 6% 11% 26% 14% 2	2520
	21st to end	Day	45% 7% 14% 21% 11% 1	2520
July	1st to 10th	Day	36% 7% 12% 28% 15% 1	2450
	11th to 20th	Day	38% 8% 16% 28% 10%	2445
	21st to end	Day	40% 7% 16% 24% 11% 1	2591
August	1st to 10th	Day	39% 8% 14% 28% 10% 1	2377
	11th to 20th	Day	40% 7% 15% 26% 11% 1	2294
	21st to end	Day	40% 6% 13% 28% 13% 1	2376
September	1st to 10th	Day	39% 5% 16% 27% 13% 1	2160
	11th to 20th	Day	36% 5% 12% 31% 16% 1	2160
	21st to end	Day	42% 6% 13% 29% 9%	1907
October	1st to 10th	Day	49% 5% 11% 22% 12% 1	1800
	11th to 20th	Day	52% 7% 13% 21% 6% 1	1800
	21st to end	Day	60% 5% 9% 17% 8% 1	1886
November	1st to 10th	Day	48% 7% 13% 23% 9% 1	1667
	11th to 20th	Day	55% 5% 10% 18% 11% 1	1520
	21st to end	Day	59% 8% 12% 12% 8%	1520
December	1st to 10th	Day	65% 5% 11% 13% 5% 1	1520
	11th to 20th	Day	63% 7% 13% 13% 4	1906
	21st to end	Day	69% 6% 6% 15% 4	2772
January	1st to 10th	Night	65% 5% 9% 14% 7%	2649
	11th to 20th	Night	66% 5% 9% 12% 7% 1	2660
	21st to end	Night	59% 5% 8% 17% 10% 1	2726
February	1st to 10th	Night	63% 5% 10% 15% 6% 1	2340
	11th to 20th	Night	57% 4 9% 20% 10% 1	2275
	21st to end	Night	57% 5% 10% 17% 10% 1	1790
March	1st to 10th	Night	55% 5% 10% 19% 11% 1	2112
	11th to 20th	Night	53% 4 9% 21% 12% 1	1980
	21st to end	Night	49% 3 6% 20% 18% 3	2093
April	1st to 10th	Night	51% 4 7% 21% 15% 2	1800
	11th to 20th	Night	48% 3 9% 19% 18% 2	1775
	21st to end	Night	53% 4 8% 15% 16% 3	1720
May	1st to 10th	Night	48% 4 8% 17% 17% 5%	1450
	11th to 20th	Night	39% 5% 10% 26% 17% 3	1416
	21st to end	Night	36% 6% 16% 20% 18% 3	1551
June	1st to 10th	Night	47% 6% 13% 21% 12% 1	1440
	11th to 20th	Night	38% 6% 13% 22% 20% 2	1440
	21st to end	Night	43% 7% 13% 22% 13% 1	1440
July	1st to 10th	Night	33% 8% 10% 26% 21% 2	1400
	11th to 20th	Night	35% 6% 13% 32% 14%	1392
	21st to end	Night	32% 7% 14% 32% 13% 1	1486
August	1st to 10th	Night	35% 7% 16% 29% 13% 1	1534
	11th to 20th	Night	37% 7% 14% 28% 13% 1	1598
	21st to end	Night	36% 8% 13% 30% 14%	1970
September	1st to 10th	Night	38% 5% 13% 30% 13% 1	1800
	11th to 20th	Night	32% 6% 14% 34% 13% 1	1800
	21st to end	Night	40% 5% 11% 31% 12% 1	2048
October	1st to 10th	Night	47% 6% 10% 21% 15% 1	2160
	11th to 20th	Night	52% 6% 11% 21% 9% 1	2160
	21st to end	Night	57% 6% 13% 15% 10% 1	2469
November	1st to 10th	Night	47% 6% 13% 22% 11% 1	2407
	11th to 20th	Night	50% 6% 12% 19% 11% 2	2660
	21st to end	Night	58% 7% 13% 16% 6%	2660
December	1st to 10th	Night	63% 6% 10% 16% 5%	2660
	11th to 20th	Night	60% 5% 11% 16% 7% 1	3288
	21st to end	Night	69% 6% 9% 12% 3	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	29% 17% 35% 14% 3 1	180
	11th to 20th	Day	33% 17% 32% 16% 2 1	180
	21st to end	Day	29% 22% 28% 17% 4	252
February	1st to 10th	Day	38% 27% 29% 5% 1	240
	11th to 20th	Day	32% 28% 33% 7%	240
	21st to end	Day	35% 19% 32% 12% 2	332
March	1st to 10th	Day	25% 20% 34% 16% 5%	420
	11th to 20th	Day	31% 19% 30% 15% 4 1	420
	21st to end	Day	32% 21% 28% 13% 6% 1	462
April	1st to 10th	Day	29% 20% 32% 13% 5%	420
	11th to 20th	Day	31% 21% 24% 13% 8% 3	412
	21st to end	Day	30% 20% 31% 13% 5% 2	420
May	1st to 10th	Day	27% 13% 30% 21% 7% 2	423
	11th to 20th	Day	20% 12% 38% 18% 8% 3	447
	21st to end	Day	18% 16% 31% 24% 9% 2	485
June	1st to 10th	Day	26% 10% 33% 21% 7% 2	450
	11th to 20th	Day	20% 13% 33% 20% 11% 3	450
	21st to end	Day	21% 12% 31% 23% 10% 2	450
July	1st to 10th	Day	15% 8% 29% 30% 15% 4	445
	11th to 20th	Day	16% 9% 29% 27% 14% 5%	444
	21st to end	Day	14% 7% 38% 28% 9% 4	488
August	1st to 10th	Day	15% 5% 32% 29% 15% 4	446
	11th to 20th	Day	13% 6% 28% 31% 15% 7%	439
	21st to end	Day	15% 10% 31% 26% 11% 7%	495
September	1st to 10th	Day	15% 9% 32% 26% 11% 7%	450
	11th to 20th	Day	13% 8% 26% 26% 15% 10%	450
	21st to end	Day	18% 12% 30% 24% 13% 3	450
October	1st to 10th	Day	30% 13% 25% 17% 11% 4	450
	11th to 20th	Day	28% 19% 31% 16% 6% 1	450
	21st to end	Day	33% 16% 26% 20% 4	448
November	1st to 10th	Day	27% 17% 29% 20% 8% 1	361
	11th to 20th	Day	31% 13% 38% 11% 6% 2	180
	21st to end	Day	27% 22% 33% 13% 4 1	180
December	1st to 10th	Day	34% 19% 30% 14% 3	180
	11th to 20th	Day	31% 22% 36% 8% 3	180
	21st to end	Day	35% 18% 33% 11% 3	198
January	1st to 10th	Night	31% 15% 30% 19% 4	760
	11th to 20th	Night	30% 18% 28% 18% 5%	760
	21st to end	Night	23% 15% 35% 22% 4	820
February	1st to 10th	Night	27% 19% 33% 18% 2	720
	11th to 20th	Night	23% 18% 39% 16% 3	703
	21st to end	Night	25% 19% 36% 17% 3	592
March	1st to 10th	Night	23% 16% 37% 20% 3	720
	11th to 20th	Night	28% 17% 29% 21% 4 1	720
	21st to end	Night	24% 14% 33% 21% 8%	792
April	1st to 10th	Night	26% 16% 33% 21% 3	720
	11th to 20th	Night	22% 19% 32% 18% 8%	711
	21st to end	Night	28% 11% 30% 23% 9%	640
May	1st to 10th	Night	26% 8% 25% 28% 12% 1	370
	11th to 20th	Night	14% 10% 37% 32% 7%	354
	21st to end	Night	13% 9% 36% 30% 12% 1	389
June	1st to 10th	Night	17% 8% 33% 31% 11% 1	360
	11th to 20th	Night	18% 8% 29% 32% 13% 1	360
	21st to end	Night	19% 4 25% 38% 14%	360
July	1st to 10th	Night	11% 5% 29% 38% 18%	350
	11th to 20th	Night	12% 3 28% 38% 18% 1	348
	21st to end	Night	12% 4 27% 42% 14% 1	394
August	1st to 10th	Night	13% 3 24% 36% 23% 1	470
	11th to 20th	Night	15% 3 23% 33% 23% 4	534
	21st to end	Night	12% 6% 29% 34% 17% 2	782
September	1st to 10th	Night	15% 6% 29% 32% 16% 3	720
	11th to 20th	Night	16% 7% 21% 28% 23% 6%	720
	21st to end	Night	20% 9% 23% 28% 18% 3	720
October	1st to 10th	Night	22% 11% 28% 20% 17% 2	720
	11th to 20th	Night	27% 13% 29% 23% 8% 1	720
	21st to end	Night	28% 14% 28% 24% 6%	792
November	1st to 10th	Night	26% 13% 30% 22% 8%	740
	11th to 20th	Night	25% 16% 31% 19% 8% 1	760
	21st to end	Night	30% 18% 28% 17% 7%	760
December	1st to 10th	Night	31% 18% 28% 20% 3	760
	11th to 20th	Night	28% 19% 33% 16% 3 1	760
	21st to end	Night	35% 15% 31% 17% 2	836

Page generated at 2024-01-24 09:37:28. Version ac07

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