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 2024-04-25.

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 8% 7% 4 5% 5% 5% 7% 32%	82806
	Night	12% 11% 5% 9% 8% 4 5% 5% 5% 6% 29%	86353
Transparency	Day	53% 6% 13% 20% 8% 1	82491
	Night	56% 6% 12% 18% 7% 1	86202
Seeing	Day	17% 14% 34% 24% 9% 2	15400
	Night	17% 11% 33% 27% 10% 1	25520

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% 13% 8% 14% 8% 8% 7% 6% 6% 5% 19%	2218
	11th to 20th	Day	5% 8% 7% 13% 13% 7% 9% 9% 8% 6% 15%	2220
	21st to end	Day	10% 16% 9% 16% 9% 4 6% 6% 5% 5% 14%	2677
February	1st to 10th	Day	8% 13% 6% 10% 8% 4 8% 7% 8% 7% 22%	1710
	11th to 20th	Day	8% 8% 6% 10% 9% 6% 6% 5% 6% 8% 28%	1664
	21st to end	Day	7% 11% 6% 11% 9% 5% 6% 6% 7% 7% 27%	1413
March	1st to 10th	Day	9% 10% 5% 9% 11% 4 4 5% 4 6% 34%	3294
	11th to 20th	Day	7% 8% 4 11% 13% 4 7% 5% 6% 7% 28%	3480
	21st to end	Day	10% 15% 5% 7% 6% 3 5% 5% 3 5% 35%	3834
April	1st to 10th	Day	13% 9% 3 7% 6% 3 5% 4 5% 7% 38%	2280
	11th to 20th	Day	13% 9% 4 7% 6% 4 5% 5% 5% 7% 34%	2432
	21st to end	Day	13% 9% 3 7% 7% 4 5% 4 5% 7% 36%	2398
May	1st to 10th	Day	15% 9% 4 6% 5% 3 4 5% 4 7% 38%	2520
	11th to 20th	Day	16% 7% 3 7% 5% 3 5% 4 6% 7% 37%	2479
	21st to end	Day	20% 6% 2 5% 5% 3 5% 4 5% 6% 39%	2895
June	1st to 10th	Day	15% 5% 3 6% 6% 4 6% 6% 6% 8% 36%	2700
	11th to 20th	Day	16% 5% 3 7% 6% 3 6% 6% 6% 7% 36%	2700
	21st to end	Day	14% 6% 3 5% 7% 4 6% 6% 7% 10% 33%	2700
July	1st to 10th	Day	9% 4 2 4 5% 3 5% 6% 6% 9% 47%	2700
	11th to 20th	Day	13% 4 2 5% 5% 3 5% 6% 6% 9% 42%	2700
	21st to end	Day	11% 5% 3 4 4 3 5% 5% 6% 9% 45%	2904
August	1st to 10th	Day	9% 5% 3 6% 5% 3 5% 5% 6% 10% 42%	2436
	11th to 20th	Day	12% 5% 2 4 4 4 6% 5% 7% 9% 43%	2301
	21st to end	Day	15% 5% 2 5% 6% 3 4 4 5% 8% 43%	2574
September	1st to 10th	Day	14% 5% 2 5% 6% 4 4 5% 5% 8% 42%	2165
	11th to 20th	Day	17% 8% 3 6% 6% 4 5% 4 6% 8% 34%	2088
	21st to end	Day	22% 7% 2 5% 4 3 3 3 5% 6% 39%	1926
October	1st to 10th	Day	21% 13% 4 9% 6% 3 4 4 5% 5% 26%	1800
	11th to 20th	Day	19% 14% 5% 7% 5% 3 4 5% 4 5% 29%	1800
	21st to end	Day	20% 17% 5% 11% 7% 4 4 3 4 5% 20%	1786
November	1st to 10th	Day	16% 17% 8% 10% 7% 4 4 3 4 4 23%	1487
	11th to 20th	Day	13% 18% 8% 14% 12% 4 3 3 2 3 18%	1520
	21st to end	Day	14% 15% 6% 16% 12% 4 4 5% 4 5% 15%	1520
December	1st to 10th	Day	9% 15% 5% 17% 13% 7% 6% 5% 5% 5% 12%	1364
	11th to 20th	Day	10% 16% 8% 12% 8% 3 5% 5% 6% 6% 20%	1679
	21st to end	Day	15% 14% 8% 12% 9% 5% 6% 5% 5% 5% 16%	2442
January	1st to 10th	Night	6% 14% 8% 12% 12% 7% 6% 6% 6% 5% 19%	4737
	11th to 20th	Night	7% 11% 5% 13% 14% 9% 10% 8% 6% 4 12%	4750
	21st to end	Night	10% 19% 8% 15% 9% 4 6% 5% 5% 5% 14%	4983
February	1st to 10th	Night	8% 11% 6% 10% 8% 5% 7% 7% 6% 7% 26%	2470
	11th to 20th	Night	7% 11% 5% 8% 5% 3 7% 7% 7% 7% 33%	2403
	21st to end	Night	7% 10% 6% 10% 10% 5% 6% 6% 6% 7% 27%	2041
March	1st to 10th	Night	11% 11% 5% 8% 8% 3 5% 5% 5% 7% 32%	3575
	11th to 20th	Night	6% 10% 6% 9% 9% 5% 6% 5% 6% 7% 32%	3479
	21st to end	Night	16% 13% 4 7% 5% 3 3 3 3 5% 36%	3797
April	1st to 10th	Night	13% 8% 4 7% 6% 3 4 6% 5% 5% 40%	1900
	11th to 20th	Night	14% 10% 3 7% 6% 3 4 3 5% 7% 37%	1698
	21st to end	Night	12% 8% 4 7% 7% 5% 5% 5% 4 6% 36%	1660
May	1st to 10th	Night	15% 10% 3 6% 4 2 5% 5% 6% 7% 37%	1440
	11th to 20th	Night	18% 5% 2 5% 4 2 5% 4 7% 7% 39%	1416
	21st to end	Night	18% 7% 3 4 4 3 4 4 4 6% 43%	1378
June	1st to 10th	Night	17% 8% 3 6% 4 2 5% 5% 6% 8% 37%	1260
	11th to 20th	Night	17% 6% 2 4 4 3 5% 5% 5% 8% 41%	1260
	21st to end	Night	15% 5% 3 5% 4 2 5% 5% 7% 9% 41%	1260
July	1st to 10th	Night	8% 4 2 4 3 2 5% 5% 6% 8% 54%	1260
	11th to 20th	Night	10% 3 2 3 4 3 5% 5% 6% 10% 48%	1260
	21st to end	Night	7% 3 1 3 4 2 4 4 6% 10% 55%	1412
August	1st to 10th	Night	8% 3 1 4 5% 3 4 4 5% 8% 54%	1501
	11th to 20th	Night	12% 5% 3 5% 5% 3 4 4 6% 9% 47%	1600
	21st to end	Night	13% 4 2 5% 5% 2 4 3 5% 7% 49%	1782
September	1st to 10th	Night	14% 6% 2 4 4 3 4 5% 5% 7% 47%	1795
	11th to 20th	Night	18% 6% 2 5% 5% 2 4 5% 5% 7% 41%	1868
	21st to end	Night	22% 8% 2 4 4 3 3 4 5% 7% 38%	2016
October	1st to 10th	Night	17% 12% 3 6% 6% 4 4 4 5% 7% 33%	2160
	11th to 20th	Night	19% 14% 4 6% 5% 3 4 5% 5% 7% 28%	2160
	21st to end	Night	19% 14% 6% 10% 7% 3 5% 4 5% 5% 24%	2566
November	1st to 10th	Night	15% 16% 6% 11% 8% 3 4 5% 4 6% 23%	2591
	11th to 20th	Night	16% 16% 6% 15% 11% 4 5% 4 4 4 16%	2660
	21st to end	Night	14% 16% 8% 14% 12% 5% 6% 3 3 4 16%	2660
December	1st to 10th	Night	7% 13% 7% 17% 13% 7% 7% 6% 4 5% 14%	2812
	11th to 20th	Night	9% 15% 7% 12% 10% 4 6% 6% 6% 6% 19%	3518
	21st to end	Night	12% 15% 8% 12% 12% 5% 5% 6% 5% 5% 15%	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	67% 6% 7% 14% 6%	2219
	11th to 20th	Day	69% 6% 10% 13% 3	2220
	21st to end	Day	70% 6% 9% 10% 4	2677
February	1st to 10th	Day	59% 5% 11% 14% 10% 1	1710
	11th to 20th	Day	55% 4 11% 21% 8% 1	1673
	21st to end	Day	57% 6% 9% 16% 10% 1	1413
March	1st to 10th	Day	52% 5% 12% 18% 12% 1	3296
	11th to 20th	Day	56% 8% 12% 17% 7%	3480
	21st to end	Day	54% 5% 9% 20% 10% 1	3834
April	1st to 10th	Day	49% 4 9% 22% 13% 2	2280
	11th to 20th	Day	50% 5% 9% 22% 12% 1	2432
	21st to end	Day	48% 5% 13% 22% 10% 1	2398
May	1st to 10th	Day	47% 7% 12% 22% 12% 1	2520
	11th to 20th	Day	47% 6% 12% 22% 12% 2	2483
	21st to end	Day	48% 6% 12% 20% 13% 1	2895
June	1st to 10th	Day	47% 7% 15% 21% 10% 1	2700
	11th to 20th	Day	47% 7% 15% 21% 10%	2700
	21st to end	Day	45% 9% 19% 20% 7%	2700
July	1st to 10th	Day	33% 8% 17% 31% 11%	2626
	11th to 20th	Day	38% 8% 16% 30% 9%	2619
	21st to end	Day	37% 8% 19% 28% 8% 1	2742
August	1st to 10th	Day	40% 8% 18% 27% 7%	2421
	11th to 20th	Day	39% 9% 19% 28% 5%	2301
	21st to end	Day	41% 7% 18% 26% 7%	2574
September	1st to 10th	Day	42% 6% 15% 28% 8%	2165
	11th to 20th	Day	49% 9% 18% 20% 3	2088
	21st to end	Day	49% 5% 15% 27% 4	1926
October	1st to 10th	Day	62% 6% 13% 16% 3	1800
	11th to 20th	Day	60% 5% 13% 18% 4	1800
	21st to end	Day	70% 6% 12% 11% 2	1786
November	1st to 10th	Day	67% 5% 12% 11% 5% 1	1487
	11th to 20th	Day	72% 6% 9% 10% 3	1520
	21st to end	Day	72% 6% 12% 9% 2	1520
December	1st to 10th	Day	74% 6% 7% 9% 3	1364
	11th to 20th	Day	64% 6% 13% 14% 3	1680
	21st to end	Day	66% 6% 7% 16% 5%	2442
January	1st to 10th	Night	66% 6% 11% 13% 3	4737
	11th to 20th	Night	73% 5% 9% 10% 3	4750
	21st to end	Night	72% 5% 11% 9% 4	4983
February	1st to 10th	Night	57% 6% 11% 17% 8% 1	2470
	11th to 20th	Night	49% 5% 15% 22% 9%	2404
	21st to end	Night	57% 5% 11% 18% 9%	2041
March	1st to 10th	Night	52% 6% 11% 18% 12% 1	3586
	11th to 20th	Night	51% 7% 14% 19% 8% 1	3480
	21st to end	Night	52% 4 9% 20% 14% 1	3797
April	1st to 10th	Night	45% 4 8% 22% 18% 2	1900
	11th to 20th	Night	47% 4 9% 22% 15% 3	1698
	21st to end	Night	48% 5% 9% 24% 13% 1	1660
May	1st to 10th	Night	46% 5% 10% 24% 14% 1	1440
	11th to 20th	Night	43% 6% 12% 22% 15% 1	1417
	21st to end	Night	45% 5% 10% 24% 14% 2	1379
June	1st to 10th	Night	45% 6% 17% 21% 10% 1	1260
	11th to 20th	Night	42% 6% 13% 24% 14% 1	1260
	21st to end	Night	40% 8% 18% 24% 9% 1	1260
July	1st to 10th	Night	26% 8% 15% 36% 13% 2	1225
	11th to 20th	Night	29% 9% 18% 32% 11% 1	1218
	21st to end	Night	26% 6% 18% 39% 11% 1	1334
August	1st to 10th	Night	29% 6% 18% 37% 9% 1	1492
	11th to 20th	Night	36% 8% 19% 29% 9%	1600
	21st to end	Night	35% 6% 18% 31% 9% 1	1782
September	1st to 10th	Night	38% 6% 16% 29% 11%	1795
	11th to 20th	Night	44% 6% 19% 25% 6%	1868
	21st to end	Night	46% 6% 15% 28% 5%	2016
October	1st to 10th	Night	52% 6% 15% 20% 7%	2160
	11th to 20th	Night	56% 5% 14% 20% 4	2160
	21st to end	Night	63% 7% 14% 14% 2	2566
November	1st to 10th	Night	65% 6% 12% 13% 4	2591
	11th to 20th	Night	71% 6% 9% 10% 4	2660
	21st to end	Night	74% 5% 12% 7% 3	2660
December	1st to 10th	Night	74% 5% 10% 8% 3	2812
	11th to 20th	Night	64% 6% 12% 14% 4	3516
	21st to end	Night	70% 7% 8% 11% 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	14% 14% 40% 20% 11% 1	270
	11th to 20th	Day	13% 8% 42% 29% 7% 1	270
	21st to end	Day	16% 13% 38% 22% 9% 1	297
February	1st to 10th	Day	17% 14% 43% 19% 6% 1	270
	11th to 20th	Day	10% 24% 37% 18% 7% 3	270
	21st to end	Day	13% 20% 44% 14% 8% 1	225
March	1st to 10th	Day	12% 16% 38% 25% 8% 1	270
	11th to 20th	Day	11% 21% 37% 25% 3 2	270
	21st to end	Day	13% 18% 39% 22% 7%	305
April	1st to 10th	Day	17% 17% 33% 23% 8% 1	460
	11th to 20th	Day	22% 17% 30% 24% 7% 1	630
	21st to end	Day	17% 14% 37% 24% 8% 1	622
May	1st to 10th	Day	18% 18% 37% 21% 5% 2	603
	11th to 20th	Day	20% 14% 32% 22% 10% 2	625
	21st to end	Day	21% 13% 31% 27% 6% 1	679
June	1st to 10th	Day	17% 12% 35% 23% 9% 3	630
	11th to 20th	Day	19% 14% 35% 22% 7% 2	630
	21st to end	Day	16% 9% 33% 27% 11% 4	630
July	1st to 10th	Day	11% 11% 33% 26% 15% 4	621
	11th to 20th	Day	15% 12% 29% 28% 14% 2	618
	21st to end	Day	9% 9% 32% 29% 16% 5%	684
August	1st to 10th	Day	10% 12% 29% 30% 15% 4	626
	11th to 20th	Day	11% 9% 29% 30% 16% 5%	615
	21st to end	Day	16% 11% 30% 29% 13% 1	693
September	1st to 10th	Day	15% 13% 33% 26% 11% 2	455
	11th to 20th	Day	22% 16% 36% 19% 7% 1	378
	21st to end	Day	23% 19% 33% 20% 5%	270
October	1st to 10th	Day	27% 14% 28% 23% 7% 1	270
	11th to 20th	Day	21% 17% 36% 24% 1	270
	21st to end	Day	29% 21% 32% 13% 4	297
November	1st to 10th	Day	23% 20% 35% 18% 4	270
	11th to 20th	Day	25% 21% 34% 19% 2	270
	21st to end	Day	24% 23% 39% 12% 3	270
December	1st to 10th	Day	16% 15% 36% 26% 7% 1	270
	11th to 20th	Day	17% 17% 44% 17% 4	270
	21st to end	Day	18% 14% 38% 21% 8% 2	297
January	1st to 10th	Night	13% 12% 37% 27% 10% 2	950
	11th to 20th	Night	16% 10% 39% 27% 7% 1	950
	21st to end	Night	14% 11% 37% 30% 7%	1045
February	1st to 10th	Night	12% 11% 36% 31% 9% 1	950
	11th to 20th	Night	12% 13% 34% 28% 11% 2	929
	21st to end	Night	12% 11% 40% 23% 12% 2	785
March	1st to 10th	Night	15% 12% 36% 26% 11%	681
	11th to 20th	Night	12% 14% 42% 23% 8% 1	570
	21st to end	Night	20% 11% 29% 25% 12% 3	627
April	1st to 10th	Night	17% 11% 31% 32% 8% 1	570
	11th to 20th	Night	18% 12% 32% 26% 11%	563
	21st to end	Night	15% 10% 34% 30% 11%	555
May	1st to 10th	Night	19% 10% 34% 30% 7% 1	540
	11th to 20th	Night	21% 9% 34% 22% 12% 1	531
	21st to end	Night	20% 10% 30% 30% 11%	584
June	1st to 10th	Night	20% 8% 28% 29% 15% 1	540
	11th to 20th	Night	17% 8% 31% 32% 11% 1	540
	21st to end	Night	16% 7% 21% 35% 19% 1	540
July	1st to 10th	Night	7% 6% 29% 37% 19% 2	525
	11th to 20th	Night	11% 6% 28% 34% 19% 1	522
	21st to end	Night	7% 5% 28% 38% 20% 3	591
August	1st to 10th	Night	9% 6% 28% 38% 19% 1	537
	11th to 20th	Night	12% 8% 22% 33% 21% 4	534
	21st to end	Night	15% 6% 27% 34% 16% 1	594
September	1st to 10th	Night	16% 7% 31% 30% 14% 2	540
	11th to 20th	Night	21% 10% 27% 29% 12% 1	540
	21st to end	Night	23% 12% 30% 24% 10% 1	576
October	1st to 10th	Night	22% 13% 32% 26% 5%	720
	11th to 20th	Night	27% 11% 30% 24% 8%	720
	21st to end	Night	26% 15% 31% 22% 6% 1	901
November	1st to 10th	Night	22% 14% 35% 21% 8%	925
	11th to 20th	Night	23% 13% 35% 23% 6%	950
	21st to end	Night	23% 17% 37% 19% 3 1	950
December	1st to 10th	Night	13% 11% 39% 26% 8% 2	950
	11th to 20th	Night	20% 12% 40% 21% 6% 1	950
	21st to end	Night	18% 11% 36% 25% 9% 1	1045

Page generated at 2024-04-22 08:25:43. Version ac07

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