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 2024-11-05.

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% 9% 4 9% 6% 5% 5% 4 6% 7% 33%	101908
	Night	11% 11% 4 10% 6% 5% 5% 4 6% 7% 31%	97302
Transparency	Day	26% 48% 9% 13% 4	105340
	Night	28% 48% 8% 12% 4	101951
Seeing	Day	17% 13% 33% 25% 10% 2	16248
	Night	17% 10% 33% 29% 11% 1	26149

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	6% 15% 7% 15% 7% 9% 6% 4 7% 6% 19%	2218
	11th to 20th	Day	5% 9% 6% 16% 11% 9% 10% 6% 8% 6% 15%	2220
	21st to end	Day	9% 17% 8% 18% 7% 6% 5% 4 6% 4 15%	2685
February	1st to 10th	Day	8% 13% 5% 11% 7% 6% 8% 6% 6% 8% 22%	1710
	11th to 20th	Day	7% 10% 5% 11% 7% 7% 7% 4 7% 8% 28%	1664
	21st to end	Day	6% 13% 5% 13% 7% 6% 7% 5% 6% 8% 25%	1413
March	1st to 10th	Day	10% 11% 4 11% 8% 4 5% 4 5% 6% 32%	3301
	11th to 20th	Day	7% 8% 5% 13% 11% 6% 6% 4 6% 7% 27%	3480
	21st to end	Day	11% 15% 5% 10% 7% 5% 4 3 4 5% 34%	3814
April	1st to 10th	Day	12% 11% 4 9% 5% 4 4 3 5% 7% 36%	2279
	11th to 20th	Day	14% 10% 3 9% 6% 5% 4 4 6% 6% 34%	2442
	21st to end	Day	15% 9% 3 8% 5% 5% 6% 4 6% 6% 32%	2470
May	1st to 10th	Day	15% 9% 3 7% 5% 4 4 4 5% 7% 35%	4414
	11th to 20th	Day	19% 9% 3 7% 5% 4 4 3 5% 7% 34%	4399
	21st to end	Day	21% 10% 3 7% 4 4 4 3 4 5% 36%	5166
June	1st to 10th	Day	14% 6% 2 7% 5% 6% 6% 4 6% 8% 35%	2850
	11th to 20th	Day	16% 7% 3 6% 5% 5% 5% 5% 6% 8% 35%	2850
	21st to end	Day	13% 7% 3 8% 5% 5% 5% 5% 7% 9% 32%	2850
July	1st to 10th	Day	9% 5% 2 6% 6% 6% 6% 5% 8% 9% 40%	4750
	11th to 20th	Day	9% 4 1 4 4 4 4 4 6% 9% 49%	4750
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 4 6% 8% 44%	5121
August	1st to 10th	Day	9% 6% 3 7% 5% 5% 5% 4 7% 9% 40%	4243
	11th to 20th	Day	11% 5% 2 5% 4 4 6% 4 7% 9% 44%	4041
	21st to end	Day	16% 5% 2 6% 5% 4 4 4 6% 8% 40%	4532
September	1st to 10th	Day	12% 5% 2 6% 5% 5% 4 5% 6% 7% 43%	2298
	11th to 20th	Day	16% 7% 3 8% 5% 5% 5% 4 6% 8% 34%	2184
	21st to end	Day	21% 7% 3 6% 5% 2 3 3 4 6% 39%	2047
October	1st to 10th	Day	19% 13% 5% 8% 5% 4 4 3 6% 6% 28%	1900
	11th to 20th	Day	17% 14% 5% 9% 5% 4 4 3 5% 5% 30%	1900
	21st to end	Day	17% 19% 5% 10% 6% 5% 4 3 3 5% 22%	1888
November	1st to 10th	Day	16% 16% 6% 11% 6% 6% 3 4 4 4 22%	1519
	11th to 20th	Day	12% 18% 8% 15% 9% 6% 4 2 4 4 19%	1520
	21st to end	Day	15% 16% 4 16% 11% 5% 4 4 4 6% 16%	1520
December	1st to 10th	Day	9% 13% 6% 19% 8% 8% 6% 6% 6% 5% 14%	1349
	11th to 20th	Day	9% 17% 7% 13% 8% 4 6% 4 6% 6% 20%	1679
	21st to end	Day	14% 14% 7% 15% 7% 6% 5% 3 5% 6% 18%	2442
January	1st to 10th	Night	5% 14% 6% 15% 10% 9% 6% 4 6% 6% 19%	4737
	11th to 20th	Night	6% 10% 6% 16% 12% 10% 9% 6% 7% 5% 12%	4750
	21st to end	Night	9% 19% 9% 16% 7% 6% 5% 4 6% 5% 15%	4966
February	1st to 10th	Night	7% 13% 5% 11% 7% 7% 5% 4 7% 8% 26%	2470
	11th to 20th	Night	8% 11% 4 9% 5% 5% 6% 6% 8% 8% 32%	2403
	21st to end	Night	7% 11% 4 12% 7% 6% 7% 5% 6% 7% 28%	2041
March	1st to 10th	Night	11% 11% 4 11% 7% 5% 5% 4 5% 7% 31%	3569
	11th to 20th	Night	6% 9% 5% 10% 9% 6% 5% 4 5% 8% 34%	3479
	21st to end	Night	15% 13% 4 9% 5% 4 3 3 4 5% 35%	3817
April	1st to 10th	Night	13% 9% 4 7% 5% 4 4 4 5% 6% 40%	1898
	11th to 20th	Night	13% 10% 4 8% 6% 4 4 3 5% 7% 37%	1689
	21st to end	Night	13% 8% 4 8% 6% 5% 5% 4 6% 6% 36%	1710
May	1st to 10th	Night	18% 10% 3 6% 3 3 4 4 4 7% 38%	2537
	11th to 20th	Night	18% 7% 2 6% 4 5% 4 4 5% 8% 36%	2506
	21st to end	Night	20% 8% 2 7% 4 3 4 4 5% 5% 38%	2418
June	1st to 10th	Night	17% 7% 2 6% 4 4 4 3 7% 8% 38%	1330
	11th to 20th	Night	16% 7% 2 5% 4 4 5% 3 5% 6% 42%	1330
	21st to end	Night	14% 6% 2 6% 5% 4 4 3 6% 8% 42%	1330
July	1st to 10th	Night	9% 5% 2 4 5% 4 4 5% 5% 9% 49%	2220
	11th to 20th	Night	6% 3 1 4 4 4 3 4 8% 11% 52%	2220
	21st to end	Night	7% 3 2 5% 4 3 4 4 6% 9% 53%	2444
August	1st to 10th	Night	7% 4 2 5% 5% 5% 5% 5% 7% 9% 46%	2694
	11th to 20th	Night	11% 5% 1 5% 3 3 4 4 6% 9% 48%	2798
	21st to end	Night	11% 5% 3 6% 4 4 4 3 6% 9% 45%	3135
September	1st to 10th	Night	13% 4 2 6% 3 4 4 3 5% 7% 49%	1881
	11th to 20th	Night	17% 6% 2 6% 4 4 3 3 5% 8% 40%	1994
	21st to end	Night	18% 9% 2 6% 4 3 3 3 5% 7% 40%	2114
October	1st to 10th	Night	15% 10% 3 7% 6% 4 5% 3 5% 7% 35%	2280
	11th to 20th	Night	17% 13% 3 7% 5% 5% 4 4 6% 6% 30%	2280
	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% 5% 5% 4 6% 5% 24%	2660
	11th to 20th	Night	14% 16% 6% 14% 8% 6% 5% 3 5% 5% 18%	2660
	21st to end	Night	15% 15% 6% 15% 10% 5% 4 4 5% 5% 17%	2660
December	1st to 10th	Night	7% 13% 5% 18% 11% 9% 6% 5% 5% 6% 15%	2831
	11th to 20th	Night	10% 16% 5% 14% 7% 5% 6% 5% 6% 6% 20%	3518
	21st to end	Night	11% 14% 7% 14% 9% 7% 6% 4 5% 6% 17%	5225

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	42% 39% 5% 9% 4	2219
	11th to 20th	Day	41% 40% 9% 9% 1	2220
	21st to end	Day	43% 41% 7% 7% 2	2685
February	1st to 10th	Day	23% 65% 5% 4 2	1710
	11th to 20th	Day	22% 64% 4 8% 2	1673
	21st to end	Day	18% 65% 3 5% 8%	1413
March	1st to 10th	Day	28% 43% 8% 13% 8% 1	3303
	11th to 20th	Day	30% 46% 10% 11% 3	3480
	21st to end	Day	32% 41% 5% 15% 6% 1	3814
April	1st to 10th	Day	16% 65% 4 8% 6% 1	2279
	11th to 20th	Day	16% 66% 4 9% 5% 1	2442
	21st to end	Day	16% 66% 5% 10% 3 1	2470
May	1st to 10th	Day	25% 44% 9% 16% 6%	4426
	11th to 20th	Day	31% 43% 7% 11% 8%	4403
	21st to end	Day	31% 41% 7% 16% 4	5166
June	1st to 10th	Day	15% 67% 5% 9% 5%	2850
	11th to 20th	Day	17% 65% 4 9% 5%	2850
	21st to end	Day	19% 65% 5% 8% 2	2850
July	1st to 10th	Day	27% 40% 14% 15% 3	4676
	11th to 20th	Day	18% 38% 16% 25% 3	4669
	21st to end	Day	23% 37% 12% 24% 3	4959
August	1st to 10th	Day	25% 39% 10% 17% 8% 1	4228
	11th to 20th	Day	21% 40% 19% 16% 4	4080
	21st to end	Day	28% 39% 16% 16% 1	4531
September	1st to 10th	Day	15% 62% 8% 12% 3	2298
	11th to 20th	Day	20% 61% 8% 9% 1	2184
	21st to end	Day	22% 60% 3 11% 3	2047
October	1st to 10th	Day	28% 38% 9% 19% 6%	3160
	11th to 20th	Day	24% 37% 13% 15% 11%	3140
	21st to end	Day	32% 38% 12% 15% 2	3085
November	1st to 10th	Day	33% 58% 4 3 1	1519
	11th to 20th	Day	29% 60% 6% 3 1	1520
	21st to end	Day	32% 60% 3 5% 1	1520
December	1st to 10th	Day	28% 60% 4 6% 2	1349
	11th to 20th	Day	29% 49% 9% 10% 2	1680
	21st to end	Day	38% 40% 6% 12% 4	2442
January	1st to 10th	Night	41% 39% 10% 8% 2	4737
	11th to 20th	Night	45% 40% 7% 7% 2	4750
	21st to end	Night	47% 41% 8% 4 1	4966
February	1st to 10th	Night	20% 66% 6% 6% 3	2470
	11th to 20th	Night	19% 65% 6% 8% 1	2404
	21st to end	Night	17% 65% 4 10% 4	2041
March	1st to 10th	Night	26% 45% 8% 12% 8%	3580
	11th to 20th	Night	25% 47% 13% 10% 4	3480
	21st to end	Night	32% 41% 4 14% 8% 1	3817
April	1st to 10th	Night	16% 65% 4 7% 8% 1	1898
	11th to 20th	Night	16% 65% 3 7% 7% 1	1689
	21st to end	Night	17% 65% 3 10% 4 1	1710
May	1st to 10th	Night	26% 43% 6% 17% 9%	2544
	11th to 20th	Night	27% 44% 9% 14% 4 1	2507
	21st to end	Night	30% 43% 8% 15% 4	2418
June	1st to 10th	Night	15% 66% 7% 7% 5%	1330
	11th to 20th	Night	15% 65% 3 9% 8% 1	1330
	21st to end	Night	16% 64% 5% 12% 3	1330
July	1st to 10th	Night	22% 39% 17% 18% 4	2185
	11th to 20th	Night	14% 38% 14% 30% 3	2178
	21st to end	Night	18% 37% 14% 28% 3	2366
August	1st to 10th	Night	23% 38% 9% 24% 5% 1	2685
	11th to 20th	Night	19% 39% 19% 21% 1	2825
	21st to end	Night	24% 39% 16% 17% 3	3135
September	1st to 10th	Night	14% 60% 8% 14% 4	1881
	11th to 20th	Night	20% 61% 8% 10% 2	1994
	21st to end	Night	21% 60% 6% 9% 4	2114
October	1st to 10th	Night	25% 38% 10% 20% 8%	3800
	11th to 20th	Night	25% 38% 12% 18% 7%	3779
	21st to end	Night	34% 38% 8% 16% 4	4456
November	1st to 10th	Night	29% 58% 7% 5% 2	2660
	11th to 20th	Night	27% 61% 4 5% 2	2660
	21st to end	Night	30% 61% 4 3 2	2660
December	1st to 10th	Night	26% 61% 7% 5% 1	2831
	11th to 20th	Night	28% 52% 8% 9% 3	3516
	21st to end	Night	40% 41% 7% 8% 4	5225

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	13% 13% 38% 23% 12% 1	270
	11th to 20th	Day	11% 12% 37% 31% 8% 1	270
	21st to end	Day	16% 14% 35% 25% 9% 1	297
February	1st to 10th	Day	17% 11% 42% 22% 6% 1	270
	11th to 20th	Day	12% 21% 36% 19% 8% 4	270
	21st to end	Day	14% 19% 46% 14% 6% 2	225
March	1st to 10th	Day	13% 13% 38% 27% 7% 1	270
	11th to 20th	Day	13% 18% 36% 24% 7% 3	270
	21st to end	Day	12% 17% 35% 28% 8%	297
April	1st to 10th	Day	18% 15% 32% 24% 10% 2	459
	11th to 20th	Day	21% 15% 32% 24% 8% 1	640
	21st to end	Day	18% 13% 34% 25% 9% 1	650
May	1st to 10th	Day	18% 16% 37% 21% 5% 3	653
	11th to 20th	Day	21% 12% 32% 24% 10% 2	675
	21st to end	Day	21% 14% 29% 26% 8% 1	734
June	1st to 10th	Day	17% 13% 35% 22% 11% 2	680
	11th to 20th	Day	18% 12% 37% 24% 8% 2	680
	21st to end	Day	16% 9% 31% 27% 13% 4	680
July	1st to 10th	Day	11% 11% 29% 26% 17% 5%	671
	11th to 20th	Day	13% 10% 30% 28% 15% 4	668
	21st to end	Day	9% 8% 33% 27% 18% 5%	739
August	1st to 10th	Day	9% 11% 30% 31% 15% 4	676
	11th to 20th	Day	13% 7% 26% 33% 15% 7%	665
	21st to end	Day	15% 11% 31% 29% 13% 2	748
September	1st to 10th	Day	12% 13% 33% 27% 13% 1	508
	11th to 20th	Day	20% 13% 36% 23% 7% 1	394
	21st to end	Day	27% 14% 33% 20% 5%	300
October	1st to 10th	Day	26% 15% 30% 21% 7%	300
	11th to 20th	Day	19% 17% 37% 24% 2	300
	21st to end	Day	28% 19% 31% 18% 4 1	330
November	1st to 10th	Day	25% 17% 33% 20% 4 1	282
	11th to 20th	Day	22% 21% 33% 20% 3	270
	21st to end	Day	26% 20% 37% 13% 4	270
December	1st to 10th	Day	13% 15% 35% 26% 10% 1	270
	11th to 20th	Day	15% 18% 43% 20% 5%	270
	21st to end	Day	16% 14% 36% 24% 8% 2	297
January	1st to 10th	Night	13% 11% 35% 29% 10% 2	950
	11th to 20th	Night	17% 8% 38% 28% 7% 2	950
	21st to end	Night	15% 9% 36% 32% 8%	1045
February	1st to 10th	Night	12% 8% 36% 34% 9% 1	950
	11th to 20th	Night	13% 11% 33% 29% 12% 2	929
	21st to end	Night	11% 12% 38% 25% 12% 2	785
March	1st to 10th	Night	13% 12% 36% 27% 11%	675
	11th to 20th	Night	12% 11% 44% 22% 9% 1	570
	21st to end	Night	20% 9% 30% 26% 12% 4	627
April	1st to 10th	Night	18% 9% 32% 32% 9% 1	570
	11th to 20th	Night	19% 9% 31% 29% 12%	563
	21st to end	Night	17% 9% 32% 31% 11%	570
May	1st to 10th	Night	20% 9% 33% 30% 7% 1	570
	11th to 20th	Night	20% 11% 31% 25% 11% 2	561
	21st to end	Night	21% 8% 28% 31% 12%	617
June	1st to 10th	Night	20% 7% 27% 31% 14% 1	570
	11th to 20th	Night	17% 8% 34% 29% 11% 1	570
	21st to end	Night	16% 6% 23% 35% 18% 2	570
July	1st to 10th	Night	7% 5% 25% 40% 21% 2	555
	11th to 20th	Night	11% 4 29% 34% 21% 1	552
	21st to end	Night	8% 5% 25% 38% 21% 3	624
August	1st to 10th	Night	8% 6% 24% 42% 19% 1	567
	11th to 20th	Night	14% 6% 21% 34% 22% 4	564
	21st to end	Night	14% 8% 26% 33% 18% 1	627
September	1st to 10th	Night	16% 7% 28% 33% 15% 2	570
	11th to 20th	Night	19% 10% 29% 27% 14% 1	570
	21st to end	Night	23% 10% 30% 26% 11% 1	594
October	1st to 10th	Night	21% 13% 35% 24% 6% 1	760
	11th to 20th	Night	23% 12% 32% 26% 7% 1	760
	21st to end	Night	23% 13% 33% 24% 6%	969
November	1st to 10th	Night	21% 13% 36% 22% 7% 1	950
	11th to 20th	Night	22% 12% 35% 23% 7% 1	950
	21st to end	Night	23% 16% 36% 19% 4 1	950
December	1st to 10th	Night	14% 10% 37% 29% 9% 1	950
	11th to 20th	Night	18% 12% 42% 22% 6% 1	950
	21st to end	Night	18% 10% 34% 26% 9% 1	1045

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