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 2024-11-05.

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	12% 11% 4 10% 6% 5% 5% 4 5% 6% 30%	97289
Transparency	Day	27% 47% 8% 13% 4	105339
	Night	29% 47% 8% 12% 4	101952
Seeing	Day	17% 14% 34% 24% 9% 2	16254
	Night	17% 11% 33% 27% 10% 1	26152

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% 10% 6% 4 6% 5% 19%	2218
	11th to 20th	Day	5% 9% 6% 16% 11% 9% 10% 6% 8% 6% 15%	2220
	21st to end	Day	10% 17% 8% 18% 8% 5% 6% 5% 5% 5% 14%	2677
February	1st to 10th	Day	7% 13% 6% 11% 7% 6% 7% 5% 7% 7% 22%	1710
	11th to 20th	Day	7% 9% 5% 11% 8% 8% 5% 5% 6% 8% 28%	1664
	21st to end	Day	6% 12% 5% 12% 8% 7% 5% 5% 7% 7% 27%	1413
March	1st to 10th	Day	9% 11% 4 11% 8% 5% 5% 4 4 6% 33%	3294
	11th to 20th	Day	7% 8% 4 14% 10% 6% 6% 4 6% 7% 28%	3480
	21st to end	Day	10% 15% 5% 9% 5% 5% 4 3 3 5% 35%	3834
April	1st to 10th	Day	13% 10% 3 8% 5% 4 4 3 5% 7% 38%	2280
	11th to 20th	Day	13% 10% 4 7% 5% 5% 5% 4 6% 6% 34%	2432
	21st to end	Day	14% 9% 3 8% 6% 5% 5% 4 5% 7% 35%	2475
May	1st to 10th	Day	15% 9% 3 6% 4 4 5% 4 5% 8% 37%	4428
	11th to 20th	Day	18% 8% 3 7% 5% 4 5% 3 5% 6% 35%	4399
	21st to end	Day	23% 9% 2 6% 3 3 3 3 5% 5% 37%	5137
June	1st to 10th	Day	14% 6% 2 7% 5% 5% 5% 5% 6% 8% 36%	2850
	11th to 20th	Day	16% 5% 2 7% 5% 5% 5% 5% 6% 7% 36%	2850
	21st to end	Day	14% 6% 2 6% 6% 5% 6% 5% 7% 9% 33%	2850
July	1st to 10th	Day	9% 5% 2 5% 4 5% 5% 5% 7% 10% 42%	4750
	11th to 20th	Day	10% 4 2 4 4 3 4 4 6% 10% 50%	4750
	21st to end	Day	11% 5% 3 6% 4 5% 5% 4 7% 8% 43%	5092
August	1st to 10th	Day	10% 6% 2 7% 5% 5% 5% 4 7% 10% 40%	4282
	11th to 20th	Day	11% 5% 2 5% 3 5% 5% 4 6% 9% 45%	4041
	21st to end	Day	17% 6% 2 5% 4 4 4 3 6% 8% 40%	4532
September	1st to 10th	Day	13% 5% 2 6% 5% 5% 4 4 6% 8% 42%	2285
	11th to 20th	Day	17% 8% 2 7% 5% 5% 5% 3 6% 8% 34%	2204
	21st to end	Day	21% 7% 2 6% 4 3 3 3 5% 6% 40%	2033
October	1st to 10th	Day	20% 14% 3 10% 5% 5% 4 3 5% 5% 27%	1900
	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 22%	1519
	11th to 20th	Day	13% 21% 6% 17% 10% 5% 3 3 2 3 17%	1520
	21st to end	Day	14% 16% 5% 19% 10% 5% 4 4 4 5% 15%	1520
December	1st to 10th	Day	8% 16% 5% 19% 12% 8% 6% 4 6% 4 12%	1364
	11th to 20th	Day	10% 17% 7% 14% 6% 5% 5% 4 6% 6% 19%	1679
	21st to end	Day	15% 15% 8% 14% 7% 7% 5% 4 5% 6% 16%	2442
January	1st to 10th	Night	5% 15% 7% 14% 10% 8% 6% 4 6% 5% 18%	4737
	11th to 20th	Night	7% 11% 5% 16% 12% 12% 9% 6% 6% 4 12%	4750
	21st to end	Night	10% 20% 8% 17% 7% 6% 5% 4 5% 4 14%	4983
February	1st to 10th	Night	8% 12% 5% 12% 6% 7% 6% 5% 6% 7% 26%	2470
	11th to 20th	Night	7% 11% 4 9% 5% 5% 6% 6% 7% 7% 32%	2403
	21st to end	Night	7% 11% 5% 11% 9% 6% 6% 5% 6% 7% 27%	2041
March	1st to 10th	Night	11% 12% 4 10% 6% 5% 5% 3 5% 7% 32%	3575
	11th to 20th	Night	6% 10% 5% 10% 7% 6% 5% 4 7% 7% 32%	3479
	21st to end	Night	16% 14% 4 8% 5% 4 3 2 4 5% 35%	3797
April	1st to 10th	Night	13% 8% 3 7% 5% 4 4 4 5% 5% 40%	1900
	11th to 20th	Night	14% 10% 3 8% 6% 3 4 3 6% 7% 36%	1698
	21st to end	Night	13% 9% 3 8% 6% 6% 5% 4 4 6% 36%	1704
May	1st to 10th	Night	17% 10% 3 6% 3 3 4 3 5% 6% 39%	2523
	11th to 20th	Night	18% 7% 3 6% 4 5% 5% 4 6% 6% 37%	2506
	21st to end	Night	21% 8% 2 6% 4 4 5% 3 5% 5% 37%	2447
June	1st to 10th	Night	16% 8% 3 6% 3 3 5% 4 6% 8% 37%	1330
	11th to 20th	Night	17% 6% 2 4 4 4 4 4 5% 7% 41%	1330
	21st to end	Night	15% 5% 3 5% 4 3 4 4 7% 8% 41%	1330
July	1st to 10th	Night	9% 4 1 5% 4 4 5% 4 7% 9% 47%	2220
	11th to 20th	Night	6% 3 2 3 4 3 5% 4 6% 11% 53%	2220
	21st to end	Night	8% 4 2 4 4 3 4 4 7% 10% 51%	2471
August	1st to 10th	Night	8% 5% 2 6% 5% 5% 5% 4 7% 9% 45%	2642
	11th to 20th	Night	11% 5% 2 5% 3 4 4 3 6% 10% 48%	2798
	21st to end	Night	12% 5% 2 7% 4 4 5% 4 5% 9% 44%	3135
September	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 5% 7% 47%	1895
	11th to 20th	Night	18% 7% 2 6% 4 4 5% 4 6% 7% 40%	1972
	21st to end	Night	21% 8% 2 5% 4 4 3 3 5% 6% 40%	2128
October	1st to 10th	Night	17% 12% 2 7% 5% 4 4 3 5% 6% 34%	2280
	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% 4 4 4 4 6% 23%	2660
	11th to 20th	Night	15% 17% 6% 18% 9% 5% 4 3 4 4 16%	2660
	21st to end	Night	14% 17% 7% 15% 11% 6% 5% 3 3 4 16%	2660
December	1st to 10th	Night	7% 15% 5% 19% 12% 9% 6% 4 4 5% 14%	2812
	11th to 20th	Night	9% 16% 6% 14% 8% 6% 5% 5% 6% 6% 19%	3518
	21st to end	Night	11% 16% 7% 14% 10% 6% 5% 4 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	45% 38% 4 8% 5%	2219
	11th to 20th	Day	45% 39% 6% 9% 2	2220
	21st to end	Day	44% 41% 6% 7% 2	2677
February	1st to 10th	Day	24% 66% 4 4 2	1710
	11th to 20th	Day	23% 64% 3 8% 2	1673
	21st to end	Day	20% 66% 2 6% 6%	1413
March	1st to 10th	Day	29% 41% 7% 13% 9% 1	3296
	11th to 20th	Day	35% 44% 7% 11% 3	3480
	21st to end	Day	33% 41% 4 14% 7% 1	3834
April	1st to 10th	Day	17% 64% 4 8% 6% 1	2280
	11th to 20th	Day	16% 66% 3 9% 5% 1	2432
	21st to end	Day	17% 65% 4 9% 4 1	2475
May	1st to 10th	Day	26% 43% 7% 19% 5%	4440
	11th to 20th	Day	33% 40% 6% 11% 9%	4403
	21st to end	Day	33% 40% 5% 17% 5%	5137
June	1st to 10th	Day	16% 65% 5% 9% 5%	2850
	11th to 20th	Day	17% 65% 4 10% 4	2850
	21st to end	Day	18% 65% 6% 8% 2	2850
July	1st to 10th	Day	26% 40% 15% 16% 3	4676
	11th to 20th	Day	17% 38% 17% 25% 4	4669
	21st to end	Day	23% 38% 12% 23% 4	4930
August	1st to 10th	Day	26% 39% 10% 17% 8% 1	4267
	11th to 20th	Day	20% 39% 20% 17% 3	4080
	21st to end	Day	29% 38% 15% 17% 1	4531
September	1st to 10th	Day	16% 60% 8% 13% 3	2285
	11th to 20th	Day	21% 61% 8% 9% 1	2204
	21st to end	Day	22% 60% 5% 10% 3	2033
October	1st to 10th	Day	31% 38% 8% 16% 6%	3160
	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% 57% 5% 3 2	1519
	11th to 20th	Day	29% 59% 5% 4 1	1520
	21st to end	Day	33% 60% 3 4 1	1520
December	1st to 10th	Day	30% 59% 3 5% 2	1364
	11th to 20th	Day	30% 50% 9% 9% 2	1680
	21st to end	Day	39% 39% 4 14% 4	2442
January	1st to 10th	Night	44% 39% 8% 8% 2	4737
	11th to 20th	Night	48% 37% 7% 6% 2	4750
	21st to end	Night	48% 40% 7% 3 1	4983
February	1st to 10th	Night	22% 66% 4 5% 2	2470
	11th to 20th	Night	21% 65% 5% 8% 2	2404
	21st to end	Night	18% 66% 3 9% 4	2041
March	1st to 10th	Night	30% 42% 6% 12% 9% 1	3586
	11th to 20th	Night	32% 43% 10% 10% 4	3480
	21st to end	Night	33% 40% 3 14% 9% 1	3797
April	1st to 10th	Night	16% 65% 3 7% 8% 1	1900
	11th to 20th	Night	17% 65% 2 8% 6% 2	1698
	21st to end	Night	17% 65% 3 11% 4 1	1704
May	1st to 10th	Night	27% 41% 5% 18% 9%	2530
	11th to 20th	Night	31% 42% 7% 15% 5% 1	2507
	21st to end	Night	33% 40% 7% 15% 5%	2448
June	1st to 10th	Night	15% 65% 6% 9% 5%	1330
	11th to 20th	Night	15% 65% 2 9% 7%	1330
	21st to end	Night	15% 65% 5% 11% 4	1330
July	1st to 10th	Night	23% 41% 17% 15% 4	2185
	11th to 20th	Night	14% 38% 14% 29% 4	2178
	21st to end	Night	18% 37% 13% 29% 3	2393
August	1st to 10th	Night	25% 38% 9% 22% 6%	2633
	11th to 20th	Night	19% 40% 18% 21% 2	2825
	21st to end	Night	26% 38% 16% 16% 3	3135
September	1st to 10th	Night	16% 60% 7% 13% 4	1895
	11th to 20th	Night	20% 60% 8% 10% 2	1972
	21st to end	Night	21% 60% 7% 9% 4	2128
October	1st to 10th	Night	28% 38% 11% 18% 5%	3800
	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% 57% 6% 5% 1	2660
	11th to 20th	Night	29% 60% 5% 5% 2	2660
	21st to end	Night	33% 59% 3 3 2	2660
December	1st to 10th	Night	28% 60% 5% 5% 2	2812
	11th to 20th	Night	29% 51% 7% 10% 3	3516
	21st to end	Night	43% 40% 5% 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	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	18% 15% 36% 23% 8% 1	650
May	1st to 10th	Day	18% 18% 38% 20% 4 2	653
	11th to 20th	Day	21% 15% 31% 22% 9% 2	675
	21st to end	Day	22% 13% 32% 26% 6% 1	734
June	1st to 10th	Day	18% 13% 35% 22% 9% 3	680
	11th to 20th	Day	20% 14% 36% 21% 7% 2	680
	21st to end	Day	16% 9% 33% 27% 11% 4	680
July	1st to 10th	Day	12% 11% 31% 26% 15% 5%	671
	11th to 20th	Day	14% 12% 28% 29% 15% 3	668
	21st to end	Day	10% 9% 32% 29% 16% 5%	739
August	1st to 10th	Day	11% 11% 29% 30% 15% 4	676
	11th to 20th	Day	11% 8% 28% 31% 16% 5%	665
	21st to end	Day	16% 11% 32% 28% 12% 1	748
September	1st to 10th	Day	14% 14% 33% 27% 11% 1	495
	11th to 20th	Day	21% 16% 36% 19% 6% 1	414
	21st to end	Day	23% 18% 34% 20% 5%	300
October	1st to 10th	Day	28% 15% 28% 22% 6% 1	300
	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% 20% 35% 17% 4 1	282
	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%	570
May	1st to 10th	Night	19% 10% 35% 29% 6% 1	570
	11th to 20th	Night	20% 10% 34% 22% 12% 1	561
	21st to end	Night	20% 10% 30% 29% 11%	617
June	1st to 10th	Night	19% 9% 28% 28% 15% 1	570
	11th to 20th	Night	18% 8% 31% 31% 10% 1	570
	21st to end	Night	16% 7% 22% 35% 19% 1	570
July	1st to 10th	Night	7% 6% 28% 36% 21% 2	555
	11th to 20th	Night	11% 6% 28% 34% 20% 1	552
	21st to end	Night	8% 4 27% 38% 20% 3	624
August	1st to 10th	Night	9% 6% 28% 38% 19% 1	567
	11th to 20th	Night	12% 7% 22% 32% 22% 4	564
	21st to end	Night	15% 7% 28% 33% 15% 1	627
September	1st to 10th	Night	15% 8% 30% 31% 15% 2	570
	11th to 20th	Night	21% 11% 27% 29% 12% 1	570
	21st to end	Night	23% 13% 29% 25% 10% 1	608
October	1st to 10th	Night	22% 14% 33% 26% 5%	760
	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	950
	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 2024-11-03 01:11:14. Version ac07

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