Upper Kananaskis Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Upper Kananaskis Lake clear sky chart from 2005-11-06 to 2024-04-03.

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	7% 11% 5% 10% 9% 5% 7% 6% 6% 8% 27%	78310
	Night	3 9% 5% 11% 10% 5% 7% 7% 7% 9% 27%	81777
Transparency	Day	47% 13% 17% 14% 7% 1	78023
	Night	41% 16% 19% 14% 8% 2	81644
Seeing	Day	17% 22% 31% 20% 8% 2	14364
	Night	11% 22% 34% 23% 9% 1	23665

By Month

Percentage Cloud Cover NW (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	4 5% 16% 16% 8% 11% 9% 7% 8% 16%	2219
	11th to 20th	Day	1 5% 4 15% 10% 6% 8% 7% 6% 9% 28%	2370
	21st to end	Day	1 12% 5% 12% 10% 6% 8% 7% 7% 8% 24%	2794
February	1st to 10th	Day	1 8% 7% 13% 10% 9% 10% 8% 8% 7% 19%	1520
	11th to 20th	Day	1 7% 8% 16% 11% 6% 8% 6% 7% 10% 20%	1636
	21st to end	Day	1 8% 6% 16% 15% 8% 9% 7% 6% 7% 17%	1570
March	1st to 10th	Day	8% 6% 17% 15% 6% 8% 7% 6% 7% 20%	1900
	11th to 20th	Day	1 11% 9% 14% 11% 5% 7% 5% 6% 8% 22%	2023
	21st to end	Day	3 18% 10% 17% 11% 5% 7% 5% 4 6% 14%	2384
April	1st to 10th	Day	5% 14% 10% 17% 11% 5% 6% 6% 5% 5% 16%	2189
	11th to 20th	Day	4 18% 9% 14% 9% 5% 6% 4 5% 7% 18%	2310
	21st to end	Day	7% 20% 8% 12% 8% 4 5% 5% 5% 7% 21%	2340
May	1st to 10th	Day	8% 22% 6% 8% 7% 4 7% 5% 5% 7% 20%	2461
	11th to 20th	Day	11% 15% 5% 7% 6% 4 6% 5% 5% 8% 28%	2618
	21st to end	Day	18% 18% 5% 8% 7% 3 5% 4 5% 6% 22%	2917
June	1st to 10th	Day	17% 13% 4 7% 7% 4 5% 5% 6% 7% 24%	2700
	11th to 20th	Day	20% 13% 5% 9% 7% 4 6% 6% 6% 6% 19%	2700
	21st to end	Day	10% 7% 4 9% 9% 5% 6% 7% 6% 7% 31%	2700
July	1st to 10th	Day	10% 7% 3 7% 6% 5% 7% 6% 7% 8% 35%	2700
	11th to 20th	Day	10% 6% 3 7% 6% 4 6% 6% 6% 7% 38%	2700
	21st to end	Day	5% 5% 2 5% 7% 4 5% 5% 6% 8% 48%	2787
August	1st to 10th	Day	10% 6% 4 7% 7% 4 6% 6% 5% 6% 39%	2507
	11th to 20th	Day	9% 6% 2 6% 6% 3 5% 4 6% 8% 44%	2358
	21st to end	Day	10% 7% 3 7% 6% 4 5% 5% 5% 8% 40%	2574
September	1st to 10th	Day	10% 10% 3 7% 6% 3 4 5% 5% 7% 40%	2184
	11th to 20th	Day	10% 11% 4 6% 7% 4 5% 5% 5% 9% 35%	2001
	21st to end	Day	7% 11% 4 8% 7% 5% 6% 6% 5% 8% 34%	1980
October	1st to 10th	Day	8% 13% 5% 10% 7% 4 5% 4 6% 6% 31%	1945
	11th to 20th	Day	4 11% 6% 10% 8% 3 6% 7% 7% 10% 28%	1620
	21st to end	Day	2 12% 5% 11% 9% 5% 7% 7% 7% 9% 26%	1782
November	1st to 10th	Day	2 13% 7% 14% 9% 6% 8% 7% 6% 8% 19%	1623
	11th to 20th	Day	1 8% 4 11% 10% 6% 9% 8% 8% 11% 25%	1414
	21st to end	Day	1 9% 5% 11% 10% 5% 8% 6% 7% 10% 29%	1330
December	1st to 10th	Day	1 7% 5% 13% 9% 6% 7% 7% 8% 10% 27%	1330
	11th to 20th	Day	1 8% 6% 11% 12% 5% 9% 10% 8% 9% 20%	1682
	21st to end	Day	1 9% 4 10% 9% 6% 8% 7% 6% 9% 31%	2442
January	1st to 10th	Night	6% 7% 20% 17% 9% 11% 7% 6% 6% 10%	4726
	11th to 20th	Night	5% 5% 11% 13% 6% 8% 7% 9% 9% 26%	4559
	21st to end	Night	2 13% 6% 12% 12% 6% 9% 7% 7% 9% 18%	4862
February	1st to 10th	Night	1 7% 5% 12% 14% 7% 10% 8% 8% 8% 19%	2660
	11th to 20th	Night	1 7% 5% 17% 10% 6% 9% 7% 8% 10% 21%	2431
	21st to end	Night	7% 5% 13% 13% 7% 9% 8% 7% 8% 23%	1884
March	1st to 10th	Night	1 6% 6% 12% 13% 7% 10% 8% 7% 9% 22%	2280
	11th to 20th	Night	2 9% 6% 12% 8% 5% 8% 7% 8% 10% 25%	2155
	21st to end	Night	1 10% 7% 16% 11% 6% 7% 7% 7% 8% 21%	2214
April	1st to 10th	Night	3 11% 8% 11% 9% 4 7% 6% 7% 10% 23%	1816
	11th to 20th	Night	3 12% 7% 14% 7% 4 5% 6% 8% 8% 25%	1601
	21st to end	Night	4 14% 6% 10% 8% 4 6% 5% 6% 6% 30%	1620
May	1st to 10th	Night	6% 16% 6% 9% 7% 4 6% 6% 6% 8% 28%	1496
	11th to 20th	Night	6% 10% 4 7% 6% 4 6% 5% 8% 8% 36%	1274
	21st to end	Night	16% 15% 5% 7% 7% 3 5% 4 5% 7% 27%	1358
June	1st to 10th	Night	14% 13% 4 7% 4 4 5% 6% 6% 8% 30%	1260
	11th to 20th	Night	17% 13% 4 8% 6% 3 5% 5% 5% 8% 27%	1260
	21st to end	Night	9% 5% 3 6% 7% 4 7% 6% 7% 7% 39%	1260
July	1st to 10th	Night	7% 6% 2 6% 5% 3 5% 5% 5% 8% 48%	1260
	11th to 20th	Night	7% 6% 2 5% 4 3 4 5% 8% 8% 48%	1260
	21st to end	Night	3 3 2 4 5% 3 4 5% 6% 7% 58%	1527
August	1st to 10th	Night	6% 5% 3 6% 5% 3 4 6% 6% 6% 50%	1432
	11th to 20th	Night	7% 5% 1 4 3 3 4 4 7% 9% 52%	1540
	21st to end	Night	8% 6% 2 4 4 3 4 5% 6% 10% 49%	1782
September	1st to 10th	Night	6% 7% 3 5% 5% 3 5% 5% 5% 8% 46%	1772
	11th to 20th	Night	9% 10% 3 6% 6% 3 4 5% 6% 7% 41%	1958
	21st to end	Night	7% 10% 3 6% 6% 3 5% 5% 7% 9% 39%	1980
October	1st to 10th	Night	6% 10% 3 9% 7% 4 5% 5% 5% 8% 38%	2014
	11th to 20th	Night	4 10% 5% 9% 7% 5% 7% 5% 7% 8% 33%	2339
	21st to end	Night	3 11% 6% 13% 9% 6% 6% 7% 6% 10% 23%	2574
November	1st to 10th	Night	2 13% 7% 13% 10% 6% 8% 7% 7% 10% 17%	2435
	11th to 20th	Night	1 8% 4 11% 10% 7% 11% 8% 9% 9% 21%	2764
	21st to end	Night	1 9% 6% 12% 11% 6% 8% 7% 9% 9% 23%	2850
December	1st to 10th	Night	1 7% 4 11% 12% 6% 10% 9% 9% 10% 21%	2850
	11th to 20th	Night	6% 5% 15% 13% 8% 10% 9% 9% 11% 15%	3510
	21st to end	Night	1 8% 5% 12% 12% 7% 9% 8% 7% 9% 24%	5214

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	43% 19% 24% 8% 4 2	2219
	11th to 20th	Day	43% 13% 15% 12% 13% 6%	2393
	21st to end	Day	39% 21% 24% 11% 5% 1	2794
February	1st to 10th	Day	48% 16% 19% 8% 5% 3	1520
	11th to 20th	Day	49% 14% 19% 10% 6% 1	1645
	21st to end	Day	53% 14% 16% 9% 5% 2	1570
March	1st to 10th	Day	51% 16% 17% 10% 5%	1900
	11th to 20th	Day	50% 16% 17% 12% 5% 1	2024
	21st to end	Day	64% 13% 13% 6% 4 1	2384
April	1st to 10th	Day	61% 12% 17% 7% 3	2189
	11th to 20th	Day	61% 10% 15% 11% 3	2310
	21st to end	Day	58% 11% 15% 12% 3 1	2340
May	1st to 10th	Day	59% 11% 15% 12% 3	2461
	11th to 20th	Day	50% 10% 20% 15% 4	2622
	21st to end	Day	59% 10% 15% 13% 3	2918
June	1st to 10th	Day	58% 10% 13% 14% 5%	2700
	11th to 20th	Day	62% 10% 13% 11% 3	2700
	21st to end	Day	48% 11% 18% 15% 7% 1	2700
July	1st to 10th	Day	43% 10% 17% 18% 11% 1	2626
	11th to 20th	Day	41% 9% 15% 20% 14% 2	2619
	21st to end	Day	33% 8% 13% 26% 19% 1	2632
August	1st to 10th	Day	43% 10% 12% 21% 12% 3	2490
	11th to 20th	Day	36% 8% 19% 25% 11% 1	2358
	21st to end	Day	39% 10% 15% 24% 12% 1	2574
September	1st to 10th	Day	41% 9% 15% 21% 12% 2	2184
	11th to 20th	Day	41% 11% 17% 18% 11% 1	2001
	21st to end	Day	42% 13% 18% 18% 8% 1	1980
October	1st to 10th	Day	48% 10% 15% 18% 8% 1	1945
	11th to 20th	Day	41% 16% 19% 16% 7% 1	1620
	21st to end	Day	45% 15% 19% 13% 7% 1	1782
November	1st to 10th	Day	49% 18% 18% 9% 4 1	1623
	11th to 20th	Day	38% 21% 23% 11% 6% 1	1414
	21st to end	Day	39% 20% 20% 12% 6% 3	1330
December	1st to 10th	Day	38% 20% 19% 11% 9% 2	1330
	11th to 20th	Day	42% 20% 21% 10% 5% 1	1684
	21st to end	Day	36% 16% 18% 15% 11% 5%	2442
January	1st to 10th	Night	48% 21% 21% 6% 3 2	4726
	11th to 20th	Night	41% 14% 16% 10% 11% 8%	4598
	21st to end	Night	40% 25% 21% 8% 6% 1	4862
February	1st to 10th	Night	48% 17% 16% 10% 7% 3	2660
	11th to 20th	Night	44% 16% 22% 10% 6% 2	2432
	21st to end	Night	48% 12% 17% 14% 8% 2	1884
March	1st to 10th	Night	41% 18% 22% 11% 7% 1	2280
	11th to 20th	Night	41% 16% 21% 13% 7% 2	2155
	21st to end	Night	51% 15% 17% 12% 4 1	2214
April	1st to 10th	Night	46% 14% 25% 10% 4	1816
	11th to 20th	Night	49% 12% 19% 13% 6%	1601
	21st to end	Night	48% 12% 16% 17% 5% 1	1620
May	1st to 10th	Night	50% 12% 18% 15% 6%	1496
	11th to 20th	Night	40% 13% 18% 23% 5%	1274
	21st to end	Night	55% 8% 15% 17% 5%	1358
June	1st to 10th	Night	49% 12% 15% 17% 6%	1260
	11th to 20th	Night	54% 11% 15% 13% 7%	1260
	21st to end	Night	34% 13% 20% 23% 9% 1	1260
July	1st to 10th	Night	33% 8% 22% 22% 13% 2	1225
	11th to 20th	Night	30% 10% 17% 27% 14% 2	1218
	21st to end	Night	22% 9% 19% 28% 21% 1	1442
August	1st to 10th	Night	29% 9% 20% 27% 12% 3	1424
	11th to 20th	Night	26% 9% 22% 34% 9%	1540
	21st to end	Night	28% 10% 19% 29% 13% 1	1782
September	1st to 10th	Night	31% 10% 20% 25% 12% 2	1772
	11th to 20th	Night	36% 11% 18% 22% 11% 2	1958
	21st to end	Night	36% 12% 22% 21% 10%	1980
October	1st to 10th	Night	40% 12% 16% 21% 11%	2014
	11th to 20th	Night	40% 15% 19% 17% 8% 1	2339
	21st to end	Night	45% 15% 18% 14% 7%	2574
November	1st to 10th	Night	48% 18% 17% 10% 6% 2	2435
	11th to 20th	Night	39% 20% 22% 12% 6% 1	2764
	21st to end	Night	41% 18% 19% 11% 7% 3	2850
December	1st to 10th	Night	37% 21% 19% 12% 7% 3	2850
	11th to 20th	Night	42% 22% 23% 7% 5% 1	3507
	21st to end	Night	39% 16% 20% 12% 8% 5%	5214

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% 23% 31% 21% 7% 4	180
	11th to 20th	Day	14% 23% 38% 19% 4 1	180
	21st to end	Day	12% 35% 35% 12% 5% 2	198
February	1st to 10th	Day	22% 28% 30% 14% 6%	180
	11th to 20th	Day	13% 22% 41% 17% 7%	266
	21st to end	Day	18% 24% 33% 19% 5%	382
March	1st to 10th	Day	16% 31% 31% 15% 5% 2	460
	11th to 20th	Day	12% 29% 35% 17% 6% 2	460
	21st to end	Day	16% 30% 30% 18% 5% 1	506
April	1st to 10th	Day	17% 24% 39% 14% 5%	429
	11th to 20th	Day	17% 26% 33% 15% 7% 2	412
	21st to end	Day	22% 24% 29% 16% 7% 2	420
May	1st to 10th	Day	19% 21% 28% 20% 9% 3	423
	11th to 20th	Day	20% 12% 23% 23% 18% 4	589
	21st to end	Day	24% 12% 21% 24% 16% 4	679
June	1st to 10th	Day	19% 17% 28% 24% 10% 1	630
	11th to 20th	Day	23% 21% 27% 21% 7% 1	630
	21st to end	Day	15% 13% 30% 27% 13% 3	630
July	1st to 10th	Day	14% 13% 28% 27% 15% 3	621
	11th to 20th	Day	15% 18% 30% 25% 10% 2	618
	21st to end	Day	8% 16% 36% 27% 11% 3	533
August	1st to 10th	Day	15% 15% 37% 23% 9% 1	447
	11th to 20th	Day	14% 19% 33% 26% 7% 1	437
	21st to end	Day	16% 22% 34% 19% 8% 1	495
September	1st to 10th	Day	21% 27% 29% 15% 6% 2	450
	11th to 20th	Day	22% 18% 35% 19% 5% 1	450
	21st to end	Day	23% 28% 29% 16% 3 1	450
October	1st to 10th	Day	20% 24% 29% 19% 7% 1	415
	11th to 20th	Day	19% 27% 29% 17% 6% 1	270
	21st to end	Day	19% 30% 32% 13% 5% 1	297
November	1st to 10th	Day	17% 33% 34% 9% 6% 1	270
	11th to 20th	Day	20% 29% 38% 10% 3	219
	21st to end	Day	21% 27% 25% 12% 11% 4	180
December	1st to 10th	Day	13% 36% 27% 16% 6% 2	180
	11th to 20th	Day	9% 35% 38% 16% 2 1	180
	21st to end	Day	12% 24% 42% 14% 8% 2	198
January	1st to 10th	Night	12% 31% 39% 15% 3	950
	11th to 20th	Night	8% 30% 42% 16% 3 1	860
	21st to end	Night	8% 33% 38% 17% 4	836
February	1st to 10th	Night	10% 27% 34% 19% 8% 2	760
	11th to 20th	Night	8% 24% 40% 21% 6% 1	744
	21st to end	Night	9% 17% 39% 24% 10% 1	628
March	1st to 10th	Night	6% 23% 41% 21% 7% 1	760
	11th to 20th	Night	9% 23% 40% 20% 7% 1	760
	21st to end	Night	8% 18% 37% 25% 9% 3	836
April	1st to 10th	Night	9% 19% 35% 27% 9% 1	724
	11th to 20th	Night	9% 21% 34% 29% 7% 1	533
	21st to end	Night	13% 17% 35% 25% 10% 1	540
May	1st to 10th	Night	13% 13% 31% 29% 14% 1	416
	11th to 20th	Night	13% 10% 22% 31% 20% 3	354
	21st to end	Night	22% 10% 25% 24% 16% 3	389
June	1st to 10th	Night	18% 14% 26% 29% 12% 2	360
	11th to 20th	Night	22% 13% 30% 22% 12% 1	360
	21st to end	Night	12% 10% 26% 30% 21% 1	360
July	1st to 10th	Night	9% 6% 24% 39% 20% 1	350
	11th to 20th	Night	11% 11% 27% 33% 16% 2	348
	21st to end	Night	7% 8% 22% 42% 21% 1	394
August	1st to 10th	Night	9% 8% 18% 40% 23% 1	358
	11th to 20th	Night	10% 9% 20% 38% 21% 2	472
	21st to end	Night	14% 12% 25% 32% 15% 2	594
September	1st to 10th	Night	13% 14% 27% 28% 15% 4	692
	11th to 20th	Night	13% 15% 27% 25% 13% 6%	720
	21st to end	Night	17% 20% 29% 21% 9% 3	720
October	1st to 10th	Night	15% 16% 31% 28% 9% 2	720
	11th to 20th	Night	11% 23% 31% 27% 7% 1	720
	21st to end	Night	13% 23% 37% 20% 5% 1	792
November	1st to 10th	Night	13% 30% 38% 14% 5%	770
	11th to 20th	Night	13% 32% 39% 12% 3 1	950
	21st to end	Night	11% 27% 40% 15% 5% 1	950
December	1st to 10th	Night	10% 28% 36% 18% 7% 1	950
	11th to 20th	Night	7% 31% 40% 17% 4	950
	21st to end	Night	7% 28% 43% 17% 6%	1045

Page generated at 2024-03-31 04:08:54. Version ac07

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