Lake of the Woods (North-East)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake of the Woods (North-East) 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% 9% 4 9% 6% 5% 5% 4 6% 7% 34%	127195
	Night	11% 11% 4 11% 6% 5% 5% 4 6% 7% 30%	122797
Transparency	Day	30% 39% 9% 15% 6% 1	130604
	Night	34% 39% 8% 13% 6%	127469
Seeing	Day	17% 13% 34% 24% 10% 2	17605
	Night	17% 10% 33% 29% 11% 1	27445

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	5% 15% 7% 16% 6% 8% 7% 4 6% 5% 21%	3178
	11th to 20th	Day	4 11% 7% 17% 10% 8% 7% 7% 12% 6% 13%	3152
	21st to end	Day	6% 14% 9% 19% 7% 7% 6% 5% 6% 5% 15%	3864
February	1st to 10th	Day	8% 13% 5% 11% 8% 6% 8% 5% 6% 8% 22%	1800
	11th to 20th	Day	6% 10% 4 11% 8% 7% 7% 5% 7% 8% 28%	1754
	21st to end	Day	5% 12% 5% 14% 8% 6% 7% 5% 6% 8% 25%	1485
March	1st to 10th	Day	8% 11% 3 9% 7% 4 5% 3 5% 7% 38%	4748
	11th to 20th	Day	10% 9% 4 12% 9% 6% 6% 4 5% 8% 28%	4980
	21st to end	Day	12% 13% 4 10% 6% 5% 4 3 4 5% 34%	5464
April	1st to 10th	Day	12% 11% 4 10% 6% 4 4 3 5% 7% 35%	2400
	11th to 20th	Day	14% 10% 3 9% 6% 5% 4 4 6% 6% 33%	2572
	21st to end	Day	16% 9% 3 8% 5% 5% 5% 4 6% 6% 32%	2600
May	1st to 10th	Day	13% 7% 3 6% 4 4 3 3 5% 6% 45%	6320
	11th to 20th	Day	16% 8% 3 7% 5% 5% 4 3 5% 7% 36%	6319
	21st to end	Day	14% 7% 2 5% 3 4 3 3 4 6% 47%	7421
June	1st to 10th	Day	14% 7% 2 7% 5% 6% 6% 4 6% 8% 35%	3000
	11th to 20th	Day	16% 6% 3 6% 5% 5% 5% 5% 6% 8% 35%	3000
	21st to end	Day	13% 7% 3 8% 5% 5% 6% 5% 7% 9% 32%	3000
July	1st to 10th	Day	7% 5% 2 6% 5% 5% 6% 4 7% 9% 42%	6799
	11th to 20th	Day	11% 5% 2 6% 4 5% 5% 4 6% 9% 43%	6800
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 6% 8% 40%	7363
August	1st to 10th	Day	9% 6% 3 7% 5% 5% 5% 4 7% 9% 40%	4377
	11th to 20th	Day	11% 5% 2 5% 4 4 6% 4 7% 9% 44%	4171
	21st to end	Day	16% 5% 2 6% 5% 4 5% 4 6% 9% 40%	4675
September	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 5% 6% 7% 42%	2419
	11th to 20th	Day	17% 7% 3 8% 5% 5% 5% 4 6% 8% 33%	2299
	21st to end	Day	20% 6% 3 6% 5% 2 3 3 4 6% 41%	2154
October	1st to 10th	Day	18% 12% 5% 8% 5% 4 4 3 6% 6% 28%	2000
	11th to 20th	Day	18% 13% 5% 9% 5% 4 4 3 5% 6% 29%	1980
	21st to end	Day	17% 19% 5% 10% 6% 5% 4 3 3 5% 22%	1888
November	1st to 10th	Day	16% 16% 6% 12% 6% 6% 3 3 4 4 23%	1567
	11th to 20th	Day	13% 19% 8% 15% 9% 6% 3 2 4 4 19%	1600
	21st to end	Day	14% 16% 5% 17% 11% 5% 4 3 4 5% 15%	1600
December	1st to 10th	Day	13% 14% 5% 17% 12% 9% 6% 4 5% 4 11%	2309
	11th to 20th	Day	9% 16% 7% 13% 7% 5% 5% 4 7% 6% 21%	2639
	21st to end	Day	11% 19% 8% 21% 8% 5% 5% 3 4 4 13%	3498
January	1st to 10th	Night	5% 15% 6% 14% 9% 8% 7% 4 7% 7% 19%	6787
	11th to 20th	Night	6% 11% 6% 14% 10% 10% 10% 7% 10% 5% 11%	6753
	21st to end	Night	8% 17% 8% 16% 8% 6% 6% 4 6% 6% 15%	7098
February	1st to 10th	Night	7% 13% 5% 10% 7% 7% 6% 5% 7% 8% 25%	2600
	11th to 20th	Night	7% 10% 4 8% 5% 5% 6% 6% 8% 9% 31%	2533
	21st to end	Night	7% 11% 5% 12% 7% 6% 7% 5% 6% 7% 28%	2145
March	1st to 10th	Night	8% 11% 4 12% 7% 5% 5% 4 6% 7% 31%	5139
	11th to 20th	Night	7% 10% 4 11% 8% 6% 6% 4 6% 8% 31%	4979
	21st to end	Night	15% 13% 4 10% 5% 4 3 3 4 5% 34%	5467
April	1st to 10th	Night	14% 9% 3 7% 5% 4 4 3 5% 6% 39%	1997
	11th to 20th	Night	14% 11% 4 8% 6% 4 4 2 5% 7% 36%	1779
	21st to end	Night	13% 8% 4 7% 6% 5% 5% 4 6% 6% 36%	1800
May	1st to 10th	Night	14% 9% 3 5% 3 3 3 3 4 6% 48%	3641
	11th to 20th	Night	16% 8% 3 6% 4 4 4 5% 5% 7% 37%	3596
	21st to end	Night	14% 6% 2 6% 4 4 4 3 5% 6% 47%	3474
June	1st to 10th	Night	16% 7% 2 6% 4 4 4 3 7% 8% 39%	1400
	11th to 20th	Night	16% 7% 2 5% 4 4 5% 4 5% 7% 43%	1400
	21st to end	Night	14% 6% 2 6% 5% 4 4 4 7% 9% 41%	1400
July	1st to 10th	Night	9% 5% 2 5% 5% 4 4 4 5% 8% 49%	3180
	11th to 20th	Night	8% 4 1 6% 4 4 4 4 8% 11% 46%	3180
	21st to end	Night	8% 4 3 6% 4 3 4 4 6% 9% 48%	3512
August	1st to 10th	Night	7% 4 2 6% 5% 5% 5% 5% 7% 9% 46%	2779
	11th to 20th	Night	11% 5% 1 5% 3 3 4 3 6% 9% 48%	2888
	21st to end	Night	11% 5% 3 6% 4 4 4 3 6% 9% 45%	3234
September	1st to 10th	Night	12% 5% 2 6% 3 4 4 3 5% 7% 49%	1980
	11th to 20th	Night	17% 6% 2 6% 4 4 3 3 5% 8% 40%	2099
	21st to end	Night	18% 8% 2 6% 4 3 3 2 5% 7% 41%	2225
October	1st to 10th	Night	15% 10% 3 7% 6% 5% 5% 3 6% 7% 35%	2400
	11th to 20th	Night	18% 13% 3 7% 5% 5% 4 4 6% 6% 30%	2377
	21st to end	Night	17% 14% 4 11% 5% 5% 5% 4 5% 5% 26%	2708
November	1st to 10th	Night	14% 16% 5% 10% 5% 6% 5% 4 6% 5% 24%	2731
	11th to 20th	Night	14% 17% 6% 13% 8% 6% 5% 3 5% 5% 18%	2800
	21st to end	Night	14% 15% 7% 16% 10% 5% 4 4 5% 4 16%	2800
December	1st to 10th	Night	10% 18% 7% 21% 10% 7% 5% 4 4 4 11%	4868
	11th to 20th	Night	9% 15% 5% 12% 8% 7% 6% 6% 7% 6% 20%	5568
	21st to end	Night	10% 15% 8% 19% 10% 7% 5% 4 4 4 14%	7480

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	50% 28% 4 9% 7% 2	3179
	11th to 20th	Day	47% 28% 7% 15% 3	3180
	21st to end	Day	51% 30% 7% 11% 2	3864
February	1st to 10th	Day	25% 62% 6% 4 2	1800
	11th to 20th	Day	23% 61% 4 9% 2	1763
	21st to end	Day	20% 62% 4 6% 7%	1485
March	1st to 10th	Day	30% 30% 12% 12% 10% 6%	4750
	11th to 20th	Day	37% 33% 10% 13% 7%	4980
	21st to end	Day	38% 30% 5% 16% 11% 1	5464
April	1st to 10th	Day	19% 62% 4 9% 7% 1	2400
	11th to 20th	Day	17% 63% 4 9% 5% 1	2572
	21st to end	Day	18% 62% 5% 10% 4 1	2600
May	1st to 10th	Day	24% 31% 9% 21% 13% 1	6330
	11th to 20th	Day	33% 31% 7% 16% 12%	6323
	21st to end	Day	25% 29% 6% 21% 16% 3	7421
June	1st to 10th	Day	16% 63% 5% 10% 5%	3000
	11th to 20th	Day	18% 62% 5% 10% 5%	3000
	21st to end	Day	21% 62% 6% 9% 3	3000
July	1st to 10th	Day	29% 29% 16% 20% 5%	6726
	11th to 20th	Day	29% 28% 15% 26% 2	6719
	21st to end	Day	30% 28% 15% 24% 4	7151
August	1st to 10th	Day	25% 38% 10% 18% 8% 1	4362
	11th to 20th	Day	22% 39% 19% 16% 4	4210
	21st to end	Day	28% 38% 16% 16% 1	4674
September	1st to 10th	Day	17% 59% 8% 13% 2	2419
	11th to 20th	Day	22% 59% 9% 8% 1	2299
	21st to end	Day	22% 57% 4 12% 3	2154
October	1st to 10th	Day	28% 38% 9% 19% 6%	3260
	11th to 20th	Day	25% 36% 13% 15% 11%	3220
	21st to end	Day	32% 38% 12% 15% 2	3085
November	1st to 10th	Day	33% 56% 5% 4 1	1567
	11th to 20th	Day	31% 57% 6% 4 1	1600
	21st to end	Day	35% 57% 3 5% 1	1600
December	1st to 10th	Day	52% 37% 6% 3 1	2309
	11th to 20th	Day	41% 32% 9% 11% 7%	2640
	21st to end	Day	55% 28% 4 10% 3	3498
January	1st to 10th	Night	48% 28% 8% 7% 9% 1	6787
	11th to 20th	Night	50% 29% 6% 12% 3	6800
	21st to end	Night	53% 30% 7% 6% 3	7098
February	1st to 10th	Night	22% 62% 6% 6% 3	2600
	11th to 20th	Night	20% 62% 7% 9% 1	2534
	21st to end	Night	19% 62% 4 10% 4	2145
March	1st to 10th	Night	34% 32% 10% 10% 9% 4	5150
	11th to 20th	Night	35% 33% 12% 12% 6%	4980
	21st to end	Night	40% 30% 4 15% 11%	5467
April	1st to 10th	Night	17% 62% 4 8% 7% 1	1997
	11th to 20th	Night	19% 62% 3 8% 7% 1	1779
	21st to end	Night	18% 62% 4 11% 5% 1	1800
May	1st to 10th	Night	24% 30% 7% 23% 16%	3648
	11th to 20th	Night	33% 32% 8% 18% 9% 1	3597
	21st to end	Night	26% 30% 6% 20% 15% 3	3474
June	1st to 10th	Night	15% 63% 8% 8% 7%	1400
	11th to 20th	Night	15% 62% 4 11% 7% 1	1400
	21st to end	Night	17% 61% 6% 12% 3	1400
July	1st to 10th	Night	26% 28% 17% 23% 6%	3145
	11th to 20th	Night	24% 28% 16% 28% 3	3138
	21st to end	Night	25% 28% 17% 26% 5%	3410
August	1st to 10th	Night	23% 37% 9% 24% 5% 1	2770
	11th to 20th	Night	20% 38% 19% 21% 1	2915
	21st to end	Night	25% 38% 16% 18% 3	3234
September	1st to 10th	Night	15% 58% 8% 15% 4	1980
	11th to 20th	Night	21% 58% 8% 10% 2	2099
	21st to end	Night	21% 57% 6% 10% 4	2225
October	1st to 10th	Night	25% 37% 10% 20% 8%	3920
	11th to 20th	Night	26% 37% 12% 18% 6%	3876
	21st to end	Night	34% 38% 8% 16% 4	4456
November	1st to 10th	Night	30% 57% 7% 6% 1	2731
	11th to 20th	Night	30% 58% 5% 5% 2	2800
	21st to end	Night	33% 58% 4 3 2	2800
December	1st to 10th	Night	53% 36% 6% 4 1	4868
	11th to 20th	Night	41% 34% 8% 8% 9%	5566
	21st to end	Night	54% 29% 5% 8% 3	7480

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	12% 13% 37% 24% 12% 1	300
	11th to 20th	Day	10% 13% 38% 30% 8% 1	300
	21st to end	Day	18% 16% 35% 23% 8% 1	330
February	1st to 10th	Day	18% 14% 40% 21% 6% 1	300
	11th to 20th	Day	11% 20% 37% 21% 8% 4	300
	21st to end	Day	14% 20% 46% 13% 5% 2	249
March	1st to 10th	Day	14% 13% 39% 26% 6% 1	300
	11th to 20th	Day	14% 19% 36% 22% 6% 2	300
	21st to end	Day	13% 18% 36% 25% 7%	330
April	1st to 10th	Day	18% 16% 33% 22% 9% 1	500
	11th to 20th	Day	21% 15% 32% 24% 7% 1	690
	21st to end	Day	20% 12% 34% 25% 9% 1	700
May	1st to 10th	Day	18% 17% 38% 21% 5% 2	703
	11th to 20th	Day	21% 13% 33% 23% 9% 2	725
	21st to end	Day	20% 13% 30% 26% 9% 2	789
June	1st to 10th	Day	17% 13% 36% 22% 11% 2	730
	11th to 20th	Day	17% 12% 38% 24% 7% 2	730
	21st to end	Day	16% 9% 32% 26% 12% 4	730
July	1st to 10th	Day	11% 11% 31% 25% 17% 5%	721
	11th to 20th	Day	13% 11% 31% 27% 14% 4	718
	21st to end	Day	9% 8% 35% 27% 17% 5%	794
August	1st to 10th	Day	10% 11% 29% 32% 15% 4	726
	11th to 20th	Day	13% 7% 27% 32% 14% 6%	715
	21st to end	Day	14% 11% 31% 30% 13% 1	803
September	1st to 10th	Day	13% 13% 33% 27% 13% 2	549
	11th to 20th	Day	21% 13% 36% 23% 7% 1	429
	21st to end	Day	25% 14% 33% 21% 7%	330
October	1st to 10th	Day	25% 15% 32% 20% 7%	330
	11th to 20th	Day	22% 17% 36% 23% 2	324
	21st to end	Day	28% 19% 31% 18% 4 1	330
November	1st to 10th	Day	24% 18% 32% 20% 5% 1	300
	11th to 20th	Day	24% 20% 34% 18% 3	300
	21st to end	Day	26% 19% 36% 14% 5%	300
December	1st to 10th	Day	14% 16% 35% 26% 9% 1	300
	11th to 20th	Day	15% 18% 44% 19% 4	300
	21st to end	Day	16% 15% 35% 23% 8% 3	330
January	1st to 10th	Night	13% 12% 35% 29% 10% 2	1000
	11th to 20th	Night	17% 9% 38% 28% 7% 2	1000
	21st to end	Night	15% 10% 36% 31% 7%	1100
February	1st to 10th	Night	12% 9% 36% 33% 9% 1	1000
	11th to 20th	Night	12% 10% 34% 30% 12% 2	979
	21st to end	Night	11% 12% 38% 25% 12% 2	825
March	1st to 10th	Night	14% 12% 38% 27% 10%	710
	11th to 20th	Night	12% 12% 44% 22% 9% 1	600
	21st to end	Night	20% 9% 30% 26% 12% 4	660
April	1st to 10th	Night	18% 9% 32% 31% 9% 1	600
	11th to 20th	Night	20% 9% 30% 29% 12%	593
	21st to end	Night	17% 9% 32% 31% 11%	600
May	1st to 10th	Night	19% 9% 34% 30% 7% 1	600
	11th to 20th	Night	20% 10% 32% 25% 10% 2	591
	21st to end	Night	20% 8% 28% 32% 12%	650
June	1st to 10th	Night	19% 7% 27% 32% 14% 1	600
	11th to 20th	Night	17% 8% 34% 30% 11% 1	600
	21st to end	Night	16% 7% 24% 35% 17% 2	600
July	1st to 10th	Night	7% 6% 25% 39% 21% 2	585
	11th to 20th	Night	11% 4 29% 35% 20% 1	582
	21st to end	Night	8% 5% 25% 39% 20% 3	657
August	1st to 10th	Night	9% 6% 24% 42% 19% 1	597
	11th to 20th	Night	14% 7% 21% 33% 21% 4	594
	21st to end	Night	14% 8% 26% 34% 17% 1	660
September	1st to 10th	Night	15% 7% 28% 34% 15% 2	600
	11th to 20th	Night	19% 10% 30% 28% 13% 1	600
	21st to end	Night	22% 9% 30% 25% 12% 1	625
October	1st to 10th	Night	20% 14% 35% 24% 5% 1	800
	11th to 20th	Night	23% 13% 31% 26% 6% 1	793
	21st to end	Night	23% 13% 33% 24% 6%	969
November	1st to 10th	Night	21% 14% 35% 22% 7% 1	975
	11th to 20th	Night	23% 13% 35% 23% 7% 1	1000
	21st to end	Night	22% 16% 36% 20% 5% 1	1000
December	1st to 10th	Night	15% 11% 36% 29% 9% 1	1000
	11th to 20th	Night	18% 13% 42% 22% 6% 1	1000
	21st to end	Night	18% 10% 34% 27% 10% 1	1100

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