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 2024-08-30.

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	16% 10% 3 8% 5% 4 4 4 5% 7% 33%	95915
	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 32%	93134
Transparency	Day	49% 6% 11% 22% 10% 1	95634
	Night	52% 6% 11% 20% 10% 1	92969
Seeing	Day	24% 15% 31% 20% 8% 3	14256
	Night	23% 13% 30% 24% 9% 1	23389

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	15% 17% 5% 9% 5% 4 5% 3 4 5% 29%	2517
	11th to 20th	Day	13% 15% 8% 13% 7% 5% 5% 3 4 5% 22%	2520
	21st to end	Day	17% 20% 7% 13% 6% 4 3 3 4 4 17%	3009
February	1st to 10th	Day	15% 16% 4 11% 6% 5% 5% 5% 5% 5% 23%	1710
	11th to 20th	Day	12% 16% 4 12% 7% 5% 5% 3 3 5% 27%	1663
	21st to end	Day	19% 15% 4 8% 7% 5% 5% 3 4 5% 24%	1555
March	1st to 10th	Day	21% 13% 4 9% 6% 4 3 2 4 5% 29%	3202
	11th to 20th	Day	11% 17% 5% 9% 5% 5% 4 3 5% 5% 31%	3480
	21st to end	Day	13% 11% 3 8% 5% 3 3 3 4 6% 42%	3969
April	1st to 10th	Day	21% 14% 3 7% 5% 3 4 3 4 5% 32%	2280
	11th to 20th	Day	22% 8% 3 7% 4 3 4 3 4 5% 37%	2254
	21st to end	Day	22% 11% 3 8% 5% 4 4 3 4 5% 32%	2380
May	1st to 10th	Day	21% 8% 3 8% 5% 5% 5% 3 5% 6% 32%	4416
	11th to 20th	Day	17% 8% 3 9% 5% 4 5% 3 5% 8% 32%	4398
	21st to end	Day	14% 5% 2 6% 4 4 5% 4 7% 8% 41%	4837
June	1st to 10th	Day	19% 8% 3 7% 5% 4 5% 5% 6% 7% 31%	2660
	11th to 20th	Day	16% 5% 2 6% 5% 4 5% 4 6% 9% 37%	2660
	21st to end	Day	17% 8% 2 7% 5% 4 4 5% 6% 8% 33%	2660
July	1st to 10th	Day	11% 6% 3 7% 5% 5% 6% 5% 8% 9% 37%	4440
	11th to 20th	Day	12% 6% 2 6% 3 4 4 5% 7% 9% 41%	4440
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 5% 8% 9% 40%	4814
August	1st to 10th	Day	12% 7% 3 7% 5% 5% 5% 4 7% 9% 38%	2524
	11th to 20th	Day	12% 6% 2 7% 4 5% 5% 6% 7% 9% 38%	2423
	21st to end	Day	14% 5% 2 6% 4 4 4 3 7% 9% 40%	2486
September	1st to 10th	Day	13% 6% 3 6% 5% 4 4 4 6% 8% 42%	2160
	11th to 20th	Day	13% 5% 2 5% 4 4 4 3 4 7% 48%	2160
	21st to end	Day	18% 6% 3 6% 4 4 4 4 5% 7% 40%	1907
October	1st to 10th	Day	21% 9% 2 7% 4 4 3 3 5% 5% 37%	1800
	11th to 20th	Day	22% 8% 3 7% 6% 4 4 3 6% 7% 29%	1800
	21st to end	Day	26% 11% 3 7% 5% 4 4 3 4 6% 26%	1886
November	1st to 10th	Day	16% 8% 3 8% 5% 4 5% 5% 5% 7% 34%	1667
	11th to 20th	Day	17% 12% 4 9% 6% 5% 3 3 5% 6% 31%	1520
	21st to end	Day	21% 14% 5% 7% 6% 3 6% 4 5% 5% 23%	1520
December	1st to 10th	Day	22% 17% 5% 10% 5% 4 4 3 5% 6% 19%	1520
	11th to 20th	Day	20% 16% 5% 10% 5% 5% 4 3 5% 4 24%	1906
	21st to end	Day	27% 17% 5% 11% 5% 4 3 3 3 3 20%	2772
January	1st to 10th	Night	18% 13% 6% 11% 6% 5% 4 3 5% 6% 22%	4429
	11th to 20th	Night	14% 15% 5% 14% 8% 6% 6% 4 4 5% 19%	4440
	21st to end	Night	20% 16% 6% 12% 6% 5% 4 3 4 4 21%	4646
February	1st to 10th	Night	16% 14% 4 10% 7% 5% 5% 4 5% 6% 22%	2470
	11th to 20th	Night	13% 13% 5% 11% 6% 5% 4 3 4 5% 29%	2403
	21st to end	Night	16% 13% 4 9% 6% 5% 4 3 5% 6% 29%	1899
March	1st to 10th	Night	19% 12% 4 8% 5% 5% 4 3 4 5% 32%	3634
	11th to 20th	Night	18% 16% 5% 9% 5% 4 4 3 4 6% 27%	3479
	21st to end	Night	16% 10% 3 7% 5% 3 3 3 4 5% 41%	3663
April	1st to 10th	Night	21% 10% 4 7% 4 3 4 4 4 5% 34%	1900
	11th to 20th	Night	20% 9% 3 6% 5% 4 3 3 5% 5% 38%	1875
	21st to end	Night	21% 10% 3 6% 4 5% 4 3 5% 6% 32%	1815
May	1st to 10th	Night	22% 10% 3 6% 4 4 5% 4 5% 6% 31%	2524
	11th to 20th	Night	19% 9% 3 6% 4 4 4 3 5% 7% 38%	2495
	21st to end	Night	14% 6% 2 5% 4 4 5% 4 6% 8% 42%	2738
June	1st to 10th	Night	15% 7% 3 7% 6% 5% 5% 5% 6% 7% 34%	1520
	11th to 20th	Night	14% 5% 2 5% 5% 4 4 4 6% 8% 43%	1520
	21st to end	Night	17% 7% 2 7% 4 4 6% 4 5% 8% 37%	1520
July	1st to 10th	Night	11% 6% 3 7% 5% 5% 6% 4 7% 8% 39%	2520
	11th to 20th	Night	14% 6% 2 5% 4 4 3 4 6% 8% 44%	2520
	21st to end	Night	10% 6% 2 5% 4 4 5% 4 6% 8% 46%	2739
August	1st to 10th	Night	10% 6% 2 6% 4 4 4 4 6% 8% 45%	1631
	11th to 20th	Night	10% 7% 3 7% 4 4 4 3 6% 9% 44%	1688
	21st to end	Night	10% 5% 2 6% 5% 4 4 4 7% 8% 45%	2070
September	1st to 10th	Night	11% 6% 3 7% 4 3 4 3 5% 8% 46%	1800
	11th to 20th	Night	13% 5% 2 5% 3 3 4 3 6% 6% 51%	1800
	21st to end	Night	17% 6% 2 5% 5% 4 4 3 5% 6% 44%	2048
October	1st to 10th	Night	17% 7% 4 7% 5% 4 4 4 5% 6% 37%	2160
	11th to 20th	Night	21% 9% 3 7% 5% 5% 5% 4 5% 6% 31%	2160
	21st to end	Night	22% 10% 3 8% 5% 5% 4 4 4 6% 29%	2469
November	1st to 10th	Night	19% 10% 3 6% 5% 3 4 4 6% 6% 36%	2407
	11th to 20th	Night	18% 11% 3 7% 4 4 5% 4 5% 6% 33%	2660
	21st to end	Night	21% 12% 3 9% 5% 5% 5% 4 5% 7% 26%	2660
December	1st to 10th	Night	20% 15% 4 10% 7% 4 4 3 5% 6% 20%	2660
	11th to 20th	Night	21% 16% 4 8% 5% 4 4 3 4 4 27%	3288
	21st to end	Night	30% 15% 4 10% 5% 4 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	57% 9% 12% 14% 6% 2	2518
	11th to 20th	Day	66% 6% 11% 10% 7%	2520
	21st to end	Day	71% 6% 8% 9% 5% 1	3009
February	1st to 10th	Day	62% 5% 9% 17% 6% 1	1710
	11th to 20th	Day	60% 5% 9% 15% 10% 1	1672
	21st to end	Day	63% 5% 9% 12% 10% 1	1555
March	1st to 10th	Day	58% 4 9% 18% 9% 1	3205
	11th to 20th	Day	55% 6% 12% 15% 11% 2	3480
	21st to end	Day	42% 6% 7% 25% 16% 4	3969
April	1st to 10th	Day	55% 4 7% 18% 13% 3	2280
	11th to 20th	Day	49% 5% 6% 22% 15% 2	2254
	21st to end	Day	55% 4 8% 17% 13% 4	2380
May	1st to 10th	Day	51% 7% 9% 22% 10% 2	4430
	11th to 20th	Day	48% 7% 12% 22% 9% 1	4402
	21st to end	Day	39% 6% 13% 26% 14% 2	4837
June	1st to 10th	Day	49% 7% 11% 20% 12% 1	2660
	11th to 20th	Day	41% 6% 11% 26% 13% 2	2660
	21st to end	Day	46% 7% 14% 21% 11% 1	2660
July	1st to 10th	Day	40% 6% 13% 28% 12% 1	4370
	11th to 20th	Day	36% 7% 16% 32% 10%	4365
	21st to end	Day	38% 7% 14% 30% 10%	4661
August	1st to 10th	Day	40% 8% 14% 27% 11% 1	2510
	11th to 20th	Day	40% 7% 15% 26% 11% 1	2423
	21st to end	Day	39% 6% 13% 28% 13% 1	2486
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	61% 7% 14% 12% 5%	4429
	11th to 20th	Night	64% 8% 11% 11% 5% 1	4440
	21st to end	Night	67% 7% 8% 11% 6% 1	4646
February	1st to 10th	Night	62% 5% 11% 16% 6%	2470
	11th to 20th	Night	56% 5% 9% 20% 10% 1	2405
	21st to end	Night	57% 5% 10% 18% 10% 1	1899
March	1st to 10th	Night	53% 6% 8% 22% 10% 1	3644
	11th to 20th	Night	57% 6% 12% 15% 9% 1	3480
	21st to end	Night	43% 6% 5% 24% 19% 3	3663
April	1st to 10th	Night	52% 4 7% 20% 15% 2	1900
	11th to 20th	Night	49% 3 9% 19% 18% 2	1875
	21st to end	Night	53% 4 8% 16% 16% 3	1815
May	1st to 10th	Night	53% 5% 10% 18% 11% 3	2530
	11th to 20th	Night	47% 7% 12% 23% 10% 2	2496
	21st to end	Night	38% 6% 13% 22% 19% 2	2739
June	1st to 10th	Night	47% 6% 13% 21% 12% 1	1520
	11th to 20th	Night	37% 6% 13% 22% 19% 2	1520
	21st to end	Night	45% 7% 13% 21% 13% 1	1520
July	1st to 10th	Night	41% 7% 11% 23% 17% 1	2480
	11th to 20th	Night	36% 6% 12% 35% 11%	2472
	21st to end	Night	35% 7% 15% 29% 12% 2	2651
August	1st to 10th	Night	36% 6% 16% 28% 13% 1	1621
	11th to 20th	Night	37% 7% 14% 29% 13% 1	1688
	21st to end	Night	35% 8% 13% 29% 13% 1	2070
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	28% 21% 29% 18% 4	267
February	1st to 10th	Day	35% 26% 29% 9% 1	270
	11th to 20th	Day	31% 27% 34% 8%	270
	21st to end	Day	34% 19% 33% 13% 2	367
March	1st to 10th	Day	26% 20% 34% 15% 5%	460
	11th to 20th	Day	30% 19% 32% 15% 3 1	460
	21st to end	Day	31% 21% 29% 12% 6% 1	506
April	1st to 10th	Day	30% 20% 32% 13% 5%	460
	11th to 20th	Day	33% 21% 24% 12% 7% 3	452
	21st to end	Day	30% 21% 30% 12% 5% 2	460
May	1st to 10th	Day	26% 13% 30% 23% 6% 2	463
	11th to 20th	Day	20% 12% 37% 21% 8% 2	487
	21st to end	Day	17% 16% 30% 25% 9% 2	529
June	1st to 10th	Day	26% 10% 33% 22% 7% 2	490
	11th to 20th	Day	18% 13% 34% 20% 12% 3	490
	21st to end	Day	23% 13% 31% 21% 10% 2	490
July	1st to 10th	Day	14% 9% 30% 28% 14% 4	485
	11th to 20th	Day	15% 11% 29% 26% 14% 4	484
	21st to end	Day	14% 7% 36% 28% 9% 4	532
August	1st to 10th	Day	17% 5% 32% 28% 15% 4	486
	11th to 20th	Day	14% 6% 28% 30% 15% 6%	479
	21st to end	Day	14% 10% 32% 27% 11% 7%	532
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	22% 15% 35% 22% 4	836
February	1st to 10th	Night	27% 18% 34% 19% 2	760
	11th to 20th	Night	23% 18% 39% 16% 3	743
	21st to end	Night	25% 19% 35% 18% 3	628
March	1st to 10th	Night	24% 16% 36% 20% 4	760
	11th to 20th	Night	28% 18% 28% 21% 4 1	760
	21st to end	Night	24% 15% 33% 20% 7%	836
April	1st to 10th	Night	26% 16% 33% 21% 3	760
	11th to 20th	Night	23% 20% 31% 17% 8%	751
	21st to end	Night	27% 12% 29% 22% 9%	675
May	1st to 10th	Night	26% 8% 26% 28% 11% 1	390
	11th to 20th	Night	15% 9% 36% 33% 7%	374
	21st to end	Night	13% 9% 36% 30% 11% 1	411
June	1st to 10th	Night	16% 8% 33% 32% 10% 1	380
	11th to 20th	Night	17% 8% 29% 33% 13% 1	380
	21st to end	Night	20% 5% 25% 36% 14%	380
July	1st to 10th	Night	10% 5% 29% 38% 17%	370
	11th to 20th	Night	12% 3 28% 38% 17% 1	368
	21st to end	Night	12% 4 26% 41% 15% 1	416
August	1st to 10th	Night	14% 3 24% 36% 22% 1	497
	11th to 20th	Night	15% 3 23% 33% 23% 3	564
	21st to end	Night	11% 6% 29% 35% 17% 2	822
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 2024-08-27 09:49:44. Version ac07

Copyright © 2024 Attilla Danko.