Kenora
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kenora clear sky chart from 2005-11-06 to 2025-10-04.

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%	127059
	Night	11% 12% 5% 11% 6% 5% 5% 4 6% 6% 29%	122590
Transparency	Day	31% 39% 9% 15% 6% 1	130466
	Night	35% 38% 8% 12% 5%	127276
Seeing	Day	17% 14% 34% 23% 9% 2	17566
	Night	17% 11% 33% 27% 10% 1	27389

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% 8% 15% 7% 9% 8% 4 6% 4 20%	3178
	11th to 20th	Day	4 11% 7% 17% 10% 8% 7% 8% 11% 6% 12%	3152
	21st to end	Day	7% 15% 9% 19% 8% 6% 6% 5% 5% 5% 15%	3855
February	1st to 10th	Day	8% 13% 6% 11% 8% 6% 8% 5% 7% 7% 21%	1800
	11th to 20th	Day	7% 9% 5% 11% 7% 8% 5% 5% 7% 8% 27%	1754
	21st to end	Day	6% 11% 5% 12% 8% 7% 5% 4 7% 7% 26%	1485
March	1st to 10th	Day	7% 10% 4 11% 6% 4 4 4 5% 6% 38%	4740
	11th to 20th	Day	10% 9% 4 12% 8% 5% 6% 4 5% 7% 29%	4980
	21st to end	Day	11% 14% 4 9% 5% 5% 4 3 4 6% 35%	5498
April	1st to 10th	Day	13% 10% 3 9% 5% 4 4 3 5% 6% 37%	2400
	11th to 20th	Day	13% 10% 4 7% 5% 5% 5% 4 6% 6% 34%	2562
	21st to end	Day	15% 9% 3 7% 5% 5% 5% 4 5% 7% 35%	2605
May	1st to 10th	Day	13% 8% 2 5% 4 3 4 3 4 7% 46%	6348
	11th to 20th	Day	15% 8% 3 7% 5% 4 5% 3 6% 7% 37%	6319
	21st to end	Day	16% 6% 2 5% 3 3 3 3 5% 6% 49%	7379
June	1st to 10th	Day	14% 6% 2 7% 5% 5% 5% 4 6% 9% 36%	3000
	11th to 20th	Day	15% 5% 2 7% 5% 5% 6% 5% 6% 7% 36%	3000
	21st to end	Day	14% 7% 2 6% 6% 5% 6% 5% 7% 9% 33%	3000
July	1st to 10th	Day	8% 5% 2 5% 5% 5% 5% 4 7% 10% 44%	6799
	11th to 20th	Day	12% 5% 2 6% 4 4 4 4 6% 9% 44%	6800
	21st to end	Day	12% 6% 3 6% 4 5% 5% 4 7% 8% 40%	7321
August	1st to 10th	Day	10% 6% 2 7% 5% 5% 5% 4 7% 10% 40%	4418
	11th to 20th	Day	11% 5% 2 5% 3 5% 5% 4 6% 9% 45%	4171
	21st to end	Day	16% 6% 2 5% 4 4 4 3 6% 8% 41%	4675
September	1st to 10th	Day	13% 5% 2 6% 5% 5% 4 4 5% 8% 42%	2405
	11th to 20th	Day	17% 8% 2 7% 5% 5% 5% 3 7% 8% 33%	2320
	21st to end	Day	20% 7% 2 6% 4 3 3 3 5% 6% 41%	2140
October	1st to 10th	Day	19% 14% 3 10% 5% 5% 4 3 5% 5% 27%	1930
	11th to 20th	Day	18% 15% 5% 8% 4 4 4 4 4 5% 29%	1900
	21st to end	Day	19% 18% 5% 12% 6% 5% 4 2 4 5% 21%	1884
November	1st to 10th	Day	16% 19% 6% 12% 6% 5% 4 2 4 4 23%	1567
	11th to 20th	Day	13% 21% 6% 16% 10% 5% 3 2 2 4 18%	1600
	21st to end	Day	14% 17% 6% 19% 10% 5% 4 4 4 4 14%	1600
December	1st to 10th	Day	11% 17% 4 19% 14% 8% 6% 4 5% 4 10%	2337
	11th to 20th	Day	10% 16% 7% 14% 6% 5% 5% 4 7% 6% 20%	2639
	21st to end	Day	12% 19% 9% 20% 8% 6% 5% 3 4 4 11%	3498
January	1st to 10th	Night	5% 16% 7% 15% 9% 8% 7% 5% 6% 5% 19%	6787
	11th to 20th	Night	7% 12% 5% 14% 11% 12% 10% 7% 9% 4 11%	6753
	21st to end	Night	9% 18% 8% 18% 7% 5% 6% 4 6% 5% 14%	7116
February	1st to 10th	Night	8% 12% 5% 11% 6% 8% 6% 5% 6% 8% 25%	2600
	11th to 20th	Night	7% 11% 4 9% 5% 5% 7% 6% 7% 7% 32%	2533
	21st to end	Night	7% 12% 5% 11% 9% 6% 6% 5% 6% 8% 26%	2145
March	1st to 10th	Night	8% 11% 5% 12% 7% 5% 5% 4 6% 7% 31%	5145
	11th to 20th	Night	7% 11% 5% 11% 7% 7% 6% 4 6% 8% 29%	4979
	21st to end	Night	16% 14% 4 9% 5% 4 3 2 4 5% 34%	5433
April	1st to 10th	Night	13% 8% 3 7% 5% 4 4 4 5% 5% 40%	2000
	11th to 20th	Night	14% 11% 3 8% 6% 3 4 3 5% 7% 36%	1788
	21st to end	Night	13% 9% 3 8% 5% 6% 5% 4 4 6% 36%	1793
May	1st to 10th	Night	13% 8% 3 5% 3 3 3 3 5% 6% 49%	3613
	11th to 20th	Night	16% 8% 3 6% 4 4 5% 4 6% 6% 37%	3596
	21st to end	Night	15% 6% 2 5% 4 4 5% 3 5% 6% 45%	3516
June	1st to 10th	Night	16% 8% 3 6% 3 3 5% 4 6% 8% 38%	1400
	11th to 20th	Night	16% 6% 2 4 4 4 4 4 5% 8% 42%	1400
	21st to end	Night	15% 5% 3 6% 4 3 5% 4 7% 8% 41%	1400
July	1st to 10th	Night	10% 5% 2 5% 4 4 5% 4 6% 9% 48%	3180
	11th to 20th	Night	9% 3 2 4 4 4 5% 5% 7% 10% 47%	3180
	21st to end	Night	9% 5% 2 6% 4 4 4 4 7% 9% 46%	3552
August	1st to 10th	Night	8% 5% 2 6% 5% 5% 5% 4 6% 9% 45%	2726
	11th to 20th	Night	11% 5% 2 5% 3 4 4 3 6% 10% 48%	2888
	21st to end	Night	12% 5% 2 7% 4 4 5% 4 5% 9% 44%	3234
September	1st to 10th	Night	13% 6% 2 5% 3 4 4 4 5% 7% 48%	1995
	11th to 20th	Night	18% 6% 2 6% 4 4 5% 4 6% 7% 39%	2076
	21st to end	Night	20% 8% 2 5% 3 4 3 3 5% 6% 41%	2240
October	1st to 10th	Night	17% 12% 2 7% 5% 4 4 3 5% 6% 34%	2317
	11th to 20th	Night	18% 15% 3 7% 4 5% 4 4 5% 7% 29%	2280
	21st to end	Night	18% 15% 5% 11% 6% 4 4 4 5% 5% 25%	2710
November	1st to 10th	Night	15% 18% 5% 11% 7% 5% 4 4 4 6% 23%	2731
	11th to 20th	Night	16% 17% 6% 17% 8% 5% 4 3 4 4 16%	2800
	21st to end	Night	13% 17% 8% 17% 10% 6% 5% 3 3 4 15%	2800
December	1st to 10th	Night	10% 21% 8% 21% 10% 7% 5% 3 3 4 10%	4836
	11th to 20th	Night	8% 16% 5% 12% 8% 7% 6% 6% 7% 5% 19%	5568
	21st to end	Night	10% 16% 8% 20% 11% 6% 5% 4 4 4 13%	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	52% 27% 3 8% 7% 2	3179
	11th to 20th	Day	50% 27% 5% 15% 3	3180
	21st to end	Day	51% 29% 6% 10% 3	3855
February	1st to 10th	Day	27% 63% 5% 4 2	1800
	11th to 20th	Day	24% 61% 4 8% 2	1763
	21st to end	Day	22% 63% 3 6% 6%	1485
March	1st to 10th	Day	32% 29% 11% 12% 10% 6%	4742
	11th to 20th	Day	41% 31% 7% 14% 7%	4980
	21st to end	Day	39% 30% 4 16% 11% 1	5498
April	1st to 10th	Day	19% 61% 4 9% 7% 1	2400
	11th to 20th	Day	18% 63% 3 10% 6% 1	2562
	21st to end	Day	19% 62% 4 10% 5% 1	2605
May	1st to 10th	Day	25% 31% 8% 22% 13%	6357
	11th to 20th	Day	34% 30% 7% 15% 13%	6323
	21st to end	Day	25% 29% 5% 23% 14% 3	7379
June	1st to 10th	Day	17% 62% 6% 10% 5%	3000
	11th to 20th	Day	18% 62% 5% 11% 4	3000
	21st to end	Day	20% 62% 6% 9% 3	3000
July	1st to 10th	Day	28% 29% 17% 21% 5%	6726
	11th to 20th	Day	28% 28% 16% 26% 3	6719
	21st to end	Day	30% 28% 14% 23% 5%	7109
August	1st to 10th	Day	26% 38% 11% 17% 8%	4403
	11th to 20th	Day	21% 38% 20% 17% 3	4210
	21st to end	Day	29% 37% 16% 17% 1	4674
September	1st to 10th	Day	18% 58% 8% 13% 3	2405
	11th to 20th	Day	22% 59% 9% 9% 1	2320
	21st to end	Day	21% 57% 6% 12% 3	2140
October	1st to 10th	Day	31% 38% 8% 17% 6%	3190
	11th to 20th	Day	24% 38% 13% 14% 10%	3140
	21st to end	Day	33% 38% 13% 13% 2	3080
November	1st to 10th	Day	33% 56% 5% 4 2	1567
	11th to 20th	Day	31% 57% 6% 5% 1	1600
	21st to end	Day	36% 57% 3 4 1	1600
December	1st to 10th	Day	54% 35% 6% 3 1	2337
	11th to 20th	Day	43% 33% 8% 10% 6%	2640
	21st to end	Day	55% 28% 3 11% 3	3498
January	1st to 10th	Night	50% 28% 6% 7% 8% 1	6787
	11th to 20th	Night	54% 27% 6% 10% 3	6800
	21st to end	Night	55% 29% 7% 6% 3	7116
February	1st to 10th	Night	25% 63% 4 6% 3	2600
	11th to 20th	Night	22% 62% 6% 9% 2	2534
	21st to end	Night	21% 63% 3 9% 4	2145
March	1st to 10th	Night	37% 30% 8% 10% 10% 4	5156
	11th to 20th	Night	41% 31% 10% 12% 6%	4980
	21st to end	Night	40% 29% 3 15% 12%	5433
April	1st to 10th	Night	17% 62% 3 9% 8% 1	2000
	11th to 20th	Night	19% 62% 2 9% 6% 1	1788
	21st to end	Night	18% 62% 3 11% 5% 1	1793
May	1st to 10th	Night	25% 29% 6% 24% 15%	3620
	11th to 20th	Night	34% 31% 8% 17% 10% 1	3597
	21st to end	Night	27% 29% 6% 21% 13% 3	3517
June	1st to 10th	Night	15% 62% 7% 10% 6%	1400
	11th to 20th	Night	15% 62% 4 11% 7%	1400
	21st to end	Night	17% 62% 6% 11% 4	1400
July	1st to 10th	Night	26% 30% 17% 22% 5%	3145
	11th to 20th	Night	24% 29% 17% 27% 4	3138
	21st to end	Night	25% 28% 16% 26% 5%	3450
August	1st to 10th	Night	26% 37% 9% 22% 6%	2717
	11th to 20th	Night	20% 39% 18% 21% 1	2915
	21st to end	Night	26% 38% 16% 17% 3	3234
September	1st to 10th	Night	17% 57% 8% 14% 4	1995
	11th to 20th	Night	22% 57% 8% 11% 2	2076
	21st to end	Night	21% 57% 7% 10% 4	2240
October	1st to 10th	Night	29% 37% 11% 17% 5%	3837
	11th to 20th	Night	26% 37% 13% 17% 6%	3779
	21st to end	Night	36% 37% 11% 13% 4	4471
November	1st to 10th	Night	31% 56% 6% 6% 1	2731
	11th to 20th	Night	31% 58% 5% 5% 2	2800
	21st to end	Night	36% 56% 3 3 1	2800
December	1st to 10th	Night	55% 36% 5% 3 1	4836
	11th to 20th	Night	43% 33% 8% 9% 7%	5566
	21st to end	Night	56% 28% 4 9% 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	13% 14% 39% 22% 10% 1	300
	11th to 20th	Day	13% 8% 42% 29% 7% 1	300
	21st to end	Day	17% 16% 37% 21% 8% 1	330
February	1st to 10th	Day	18% 16% 42% 19% 5% 1	300
	11th to 20th	Day	9% 23% 37% 20% 7% 4	300
	21st to end	Day	14% 19% 45% 14% 7% 1	249
March	1st to 10th	Day	13% 17% 38% 23% 7% 1	300
	11th to 20th	Day	11% 21% 39% 24% 3 2	300
	21st to end	Day	14% 18% 40% 21% 6% 1	339
April	1st to 10th	Day	18% 17% 34% 22% 8% 1	500
	11th to 20th	Day	22% 16% 31% 23% 7% 1	680
	21st to end	Day	19% 14% 35% 23% 8% 1	700
May	1st to 10th	Day	17% 18% 39% 20% 5% 2	703
	11th to 20th	Day	21% 16% 32% 21% 8% 2	725
	21st to end	Day	20% 12% 32% 26% 7% 2	789
June	1st to 10th	Day	17% 14% 36% 22% 8% 3	730
	11th to 20th	Day	19% 14% 37% 22% 7% 2	730
	21st to end	Day	16% 10% 33% 26% 11% 4	730
July	1st to 10th	Day	12% 11% 32% 26% 15% 4	721
	11th to 20th	Day	14% 12% 30% 28% 14% 3	718
	21st to end	Day	10% 9% 33% 29% 15% 4	794
August	1st to 10th	Day	12% 11% 29% 30% 15% 4	726
	11th to 20th	Day	12% 9% 29% 30% 16% 5%	715
	21st to end	Day	16% 10% 31% 29% 12% 1	803
September	1st to 10th	Day	14% 13% 33% 26% 11% 2	535
	11th to 20th	Day	22% 15% 37% 20% 6% 1	450
	21st to end	Day	21% 18% 33% 21% 6% 1	330
October	1st to 10th	Day	27% 15% 28% 22% 6% 1	309
	11th to 20th	Day	21% 19% 36% 23% 1	300
	21st to end	Day	28% 21% 35% 13% 4	330
November	1st to 10th	Day	23% 21% 33% 18% 4 1	300
	11th to 20th	Day	26% 20% 34% 18% 2	300
	21st to end	Day	24% 22% 37% 12% 4	300
December	1st to 10th	Day	17% 14% 35% 26% 6% 1	300
	11th to 20th	Day	18% 16% 45% 18% 4	300
	21st to end	Day	17% 14% 37% 21% 8% 2	330
January	1st to 10th	Night	13% 12% 37% 27% 10% 2	1000
	11th to 20th	Night	16% 10% 39% 28% 7% 1	1000
	21st to end	Night	14% 12% 37% 29% 7%	1100
February	1st to 10th	Night	13% 11% 36% 31% 9% 1	1000
	11th to 20th	Night	12% 12% 34% 29% 11% 2	979
	21st to end	Night	12% 11% 40% 23% 12% 2	825
March	1st to 10th	Night	15% 12% 37% 26% 11%	716
	11th to 20th	Night	12% 14% 42% 23% 8% 1	600
	21st to end	Night	20% 11% 29% 25% 12% 3	660
April	1st to 10th	Night	18% 11% 31% 32% 8% 1	600
	11th to 20th	Night	19% 12% 31% 27% 11%	593
	21st to end	Night	15% 11% 34% 30% 11%	600
May	1st to 10th	Night	18% 10% 36% 29% 7% 1	600
	11th to 20th	Night	21% 10% 35% 21% 12% 1	591
	21st to end	Night	19% 10% 30% 29% 12%	650
June	1st to 10th	Night	19% 9% 29% 29% 14% 1	600
	11th to 20th	Night	17% 8% 32% 32% 10% 1	600
	21st to end	Night	16% 8% 23% 35% 18% 1	600
July	1st to 10th	Night	8% 5% 28% 36% 21% 2	585
	11th to 20th	Night	11% 6% 28% 35% 19% 1	582
	21st to end	Night	8% 4 28% 38% 20% 2	657
August	1st to 10th	Night	9% 6% 27% 38% 19% 1	597
	11th to 20th	Night	13% 7% 22% 32% 21% 4	594
	21st to end	Night	15% 7% 28% 33% 16% 1	660
September	1st to 10th	Night	15% 7% 30% 31% 15% 2	600
	11th to 20th	Night	21% 11% 27% 29% 12% 1	600
	21st to end	Night	22% 12% 29% 25% 11% 1	640
October	1st to 10th	Night	22% 14% 33% 26% 5%	773
	11th to 20th	Night	27% 11% 31% 24% 7%	760
	21st to end	Night	25% 14% 32% 22% 5% 1	952
November	1st to 10th	Night	22% 14% 34% 21% 8% 1	975
	11th to 20th	Night	25% 13% 35% 22% 6%	1000
	21st to end	Night	22% 17% 37% 20% 4 1	1000
December	1st to 10th	Night	15% 11% 38% 26% 8% 2	1000
	11th to 20th	Night	20% 12% 41% 21% 6% 1	1000
	21st to end	Night	17% 10% 36% 26% 10% 1	1100

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