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 2024-11-04.

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	6% 11% 4 11% 7% 6% 6% 5% 6% 7% 30%	105562
	Night	3 9% 5% 12% 8% 7% 6% 5% 7% 8% 30%	102017
Transparency	Day	22% 51% 10% 10% 6% 1	105316
	Night	20% 52% 11% 10% 5% 1	101909
Seeing	Day	18% 22% 31% 20% 8% 2	15268
	Night	11% 22% 34% 23% 9% 1	24280

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% 18% 14% 11% 11% 6% 7% 8% 16%	2219
	11th to 20th	Day	1 6% 4 16% 8% 8% 7% 6% 6% 9% 28%	2370
	21st to end	Day	1 12% 5% 14% 9% 8% 7% 6% 7% 8% 23%	2794
February	1st to 10th	Day	10% 6% 14% 9% 12% 9% 5% 8% 7% 19%	1520
	11th to 20th	Day	1 8% 7% 18% 10% 8% 6% 5% 6% 10% 20%	1636
	21st to end	Day	1 9% 5% 18% 13% 10% 8% 5% 6% 7% 17%	1570
March	1st to 10th	Day	6% 5% 20% 15% 7% 6% 5% 5% 7% 25%	3138
	11th to 20th	Day	1 11% 10% 14% 7% 5% 5% 3 5% 6% 33%	3387
	21st to end	Day	2 20% 11% 21% 9% 7% 5% 3 4 4 14%	3969
April	1st to 10th	Day	4 17% 9% 20% 9% 5% 6% 4 5% 5% 16%	2285
	11th to 20th	Day	3 19% 8% 16% 8% 6% 5% 4 6% 7% 18%	2440
	21st to end	Day	6% 21% 7% 13% 7% 5% 5% 4 6% 6% 20%	2470
May	1st to 10th	Day	11% 27% 5% 8% 5% 5% 5% 4 4 5% 21%	4322
	11th to 20th	Day	8% 17% 6% 10% 6% 6% 6% 5% 6% 8% 23%	4630
	21st to end	Day	12% 24% 5% 11% 7% 5% 5% 4 5% 5% 16%	5161
June	1st to 10th	Day	16% 14% 4 8% 6% 5% 4 4 7% 7% 25%	2850
	11th to 20th	Day	18% 14% 4 10% 6% 5% 6% 4 6% 6% 20%	2850
	21st to end	Day	10% 8% 3 11% 7% 6% 6% 5% 6% 6% 31%	2850
July	1st to 10th	Day	7% 5% 2 8% 4 5% 6% 4 6% 7% 45%	4740
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 5% 6% 8% 51%	4740
	21st to end	Day	3 4 1 6% 5% 5% 5% 4 6% 8% 52%	4864
August	1st to 10th	Day	10% 6% 3 9% 6% 5% 6% 4 6% 7% 38%	4401
	11th to 20th	Day	8% 6% 2 8% 5% 6% 6% 4 8% 9% 39%	4123
	21st to end	Day	8% 7% 2 7% 4 5% 5% 5% 6% 9% 43%	4521
September	1st to 10th	Day	10% 9% 3 8% 5% 4 4 4 5% 7% 42%	2305
	11th to 20th	Day	10% 11% 4 7% 6% 5% 5% 4 5% 9% 34%	2112
	21st to end	Day	6% 11% 3 8% 7% 6% 6% 5% 5% 8% 36%	2090
October	1st to 10th	Day	6% 10% 3 8% 6% 5% 5% 3 6% 8% 41%	3414
	11th to 20th	Day	2 8% 3 8% 6% 5% 8% 7% 9% 11% 33%	2842
	21st to end	Day	2 9% 4 10% 6% 6% 7% 6% 8% 8% 32%	3101
November	1st to 10th	Day	2 14% 6% 17% 8% 7% 8% 5% 6% 8% 19%	1650
	11th to 20th	Day	1 8% 4 12% 9% 8% 8% 7% 8% 11% 25%	1414
	21st to end	Day	11% 4 12% 8% 7% 7% 5% 7% 10% 29%	1330
December	1st to 10th	Day	1 7% 4 14% 9% 8% 6% 6% 8% 10% 26%	1330
	11th to 20th	Day	1 9% 6% 14% 10% 7% 9% 8% 8% 9% 20%	1682
	21st to end	Day	10% 4 12% 7% 9% 7% 6% 6% 9% 31%	2442
January	1st to 10th	Night	7% 7% 23% 15% 11% 10% 5% 6% 6% 10%	4726
	11th to 20th	Night	6% 4 13% 11% 8% 8% 6% 9% 9% 26%	4559
	21st to end	Night	2 14% 5% 15% 10% 9% 8% 5% 7% 9% 18%	4862
February	1st to 10th	Night	1 8% 5% 14% 13% 10% 9% 6% 8% 7% 19%	2660
	11th to 20th	Night	8% 5% 18% 9% 8% 7% 6% 8% 10% 21%	2431
	21st to end	Night	7% 5% 14% 12% 9% 9% 6% 7% 7% 23%	1884
March	1st to 10th	Night	4 5% 18% 13% 9% 7% 5% 7% 9% 23%	3736
	11th to 20th	Night	2 11% 8% 12% 6% 5% 5% 4 6% 7% 35%	3591
	21st to end	Night	1 16% 12% 19% 8% 6% 5% 4 6% 6% 17%	3684
April	1st to 10th	Night	3 14% 7% 13% 8% 6% 6% 5% 7% 10% 23%	1895
	11th to 20th	Night	2 13% 6% 15% 6% 5% 5% 5% 8% 8% 26%	1691
	21st to end	Night	3 16% 5% 12% 7% 6% 5% 4 6% 6% 30%	1710
May	1st to 10th	Night	9% 22% 8% 10% 5% 4 4 3 5% 6% 26%	2638
	11th to 20th	Night	5% 12% 5% 10% 6% 5% 6% 5% 7% 7% 32%	2248
	21st to end	Night	12% 22% 5% 10% 5% 4 4 3 5% 6% 24%	2414
June	1st to 10th	Night	13% 14% 3 7% 5% 5% 5% 5% 6% 7% 30%	1330
	11th to 20th	Night	16% 15% 3 8% 5% 5% 4 4 5% 8% 27%	1330
	21st to end	Night	9% 5% 2 7% 6% 6% 6% 5% 8% 7% 40%	1330
July	1st to 10th	Night	5% 6% 2 8% 5% 5% 4 4 5% 5% 50%	2220
	11th to 20th	Night	4 3 1 4 3 4 4 3 8% 8% 58%	2220
	21st to end	Night	2 4 1 4 3 3 4 4 5% 7% 64%	2685
August	1st to 10th	Night	6% 9% 3 7% 5% 5% 5% 5% 7% 8% 41%	2529
	11th to 20th	Night	5% 5% 1 5% 4 5% 4 4 8% 9% 49%	2710
	21st to end	Night	7% 6% 1 5% 4 4 4 4 7% 9% 49%	3146
September	1st to 10th	Night	6% 7% 3 6% 4 4 5% 4 5% 8% 48%	1871
	11th to 20th	Night	9% 11% 3 7% 5% 4 4 4 6% 7% 41%	2067
	21st to end	Night	6% 10% 2 7% 5% 5% 4 4 8% 8% 40%	2090
October	1st to 10th	Night	4 9% 3 8% 5% 5% 5% 5% 6% 9% 40%	3550
	11th to 20th	Night	2 7% 3 7% 5% 6% 7% 4 7% 10% 41%	4085
	21st to end	Night	2 9% 5% 11% 6% 6% 7% 7% 7% 10% 29%	4457
November	1st to 10th	Night	2 13% 7% 15% 9% 9% 7% 5% 7% 10% 17%	2480
	11th to 20th	Night	1 8% 4 13% 10% 10% 9% 6% 9% 9% 21%	2764
	21st to end	Night	1 10% 4 14% 10% 7% 8% 5% 9% 9% 22%	2850
December	1st to 10th	Night	1 8% 4 13% 11% 9% 9% 7% 9% 9% 21%	2850
	11th to 20th	Night	6% 5% 17% 11% 10% 9% 7% 9% 11% 15%	3510
	21st to end	Night	8% 5% 14% 10% 9% 8% 6% 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	29% 46% 16% 4 2 2	2219
	11th to 20th	Day	29% 40% 7% 8% 12% 4	2393
	21st to end	Day	21% 53% 17% 7% 2	2794
February	1st to 10th	Day	18% 69% 7% 2 3 1	1520
	11th to 20th	Day	17% 68% 7% 4 3 1	1645
	21st to end	Day	18% 68% 7% 3 4 1	1570
March	1st to 10th	Day	24% 46% 15% 6% 9% 1	3138
	11th to 20th	Day	20% 44% 21% 11% 2 1	3388
	21st to end	Day	39% 47% 6% 3 5%	3969
April	1st to 10th	Day	21% 68% 6% 4 1	2285
	11th to 20th	Day	19% 68% 7% 4 2	2440
	21st to end	Day	22% 66% 6% 5% 2	2470
May	1st to 10th	Day	38% 42% 8% 10% 3	4322
	11th to 20th	Day	26% 50% 11% 11% 2	4634
	21st to end	Day	29% 49% 16% 4 2	5162
June	1st to 10th	Day	14% 67% 9% 8% 2	2850
	11th to 20th	Day	20% 66% 5% 6% 3	2850
	21st to end	Day	19% 66% 5% 5% 4 1	2850
July	1st to 10th	Day	19% 39% 6% 12% 22% 3	4666
	11th to 20th	Day	15% 39% 7% 20% 16% 2	4659
	21st to end	Day	15% 38% 7% 15% 21% 4	4710
August	1st to 10th	Day	24% 42% 6% 16% 10% 1	4384
	11th to 20th	Day	25% 42% 12% 17% 4	4164
	21st to end	Day	19% 40% 13% 20% 7%	4520
September	1st to 10th	Day	17% 63% 6% 9% 4 1	2305
	11th to 20th	Day	20% 63% 6% 6% 4	2112
	21st to end	Day	20% 63% 7% 6% 4 1	2090
October	1st to 10th	Day	19% 42% 14% 19% 6%	3414
	11th to 20th	Day	18% 43% 17% 12% 10%	2842
	21st to end	Day	19% 42% 13% 20% 6%	3101
November	1st to 10th	Day	23% 65% 6% 4 2	1650
	11th to 20th	Day	13% 68% 9% 5% 4 1	1414
	21st to end	Day	15% 65% 9% 5% 4 2	1330
December	1st to 10th	Day	16% 66% 9% 5% 4 1	1330
	11th to 20th	Day	22% 56% 14% 5% 3	1684
	21st to end	Day	19% 44% 13% 10% 9% 5%	2442
January	1st to 10th	Night	32% 48% 14% 2 2 1	4726
	11th to 20th	Night	26% 41% 10% 6% 10% 7%	4598
	21st to end	Night	25% 55% 13% 4 2	4862
February	1st to 10th	Night	18% 68% 6% 3 3 1	2660
	11th to 20th	Night	15% 69% 9% 3 3 1	2432
	21st to end	Night	16% 67% 5% 5% 5% 1	1884
March	1st to 10th	Night	21% 47% 17% 8% 7% 1	3736
	11th to 20th	Night	18% 44% 19% 15% 3 1	3591
	21st to end	Night	38% 46% 8% 6% 3	3684
April	1st to 10th	Night	15% 70% 8% 4 3	1895
	11th to 20th	Night	14% 68% 9% 7% 3	1691
	21st to end	Night	20% 66% 4 6% 3	1710
May	1st to 10th	Night	35% 43% 5% 14% 3	2638
	11th to 20th	Night	25% 46% 11% 17% 2	2248
	21st to end	Night	26% 51% 14% 6% 3	2414
June	1st to 10th	Night	12% 67% 7% 10% 3	1330
	11th to 20th	Night	16% 68% 6% 5% 4	1330
	21st to end	Night	15% 66% 6% 7% 6% 1	1330
July	1st to 10th	Night	19% 41% 7% 12% 18% 4	2185
	11th to 20th	Night	10% 39% 9% 24% 16% 2	2178
	21st to end	Night	11% 37% 8% 17% 20% 7%	2600
August	1st to 10th	Night	24% 42% 9% 19% 5% 1	2521
	11th to 20th	Night	19% 41% 18% 16% 5%	2735
	21st to end	Night	18% 40% 21% 17% 4	3146
September	1st to 10th	Night	15% 63% 7% 10% 3 1	1871
	11th to 20th	Night	18% 63% 5% 9% 5%	2067
	21st to end	Night	17% 63% 8% 9% 3	2090
October	1st to 10th	Night	20% 43% 12% 16% 10%	3550
	11th to 20th	Night	15% 43% 14% 21% 7%	4085
	21st to end	Night	17% 44% 14% 20% 5%	4457
November	1st to 10th	Night	22% 64% 6% 3 3	2480
	11th to 20th	Night	14% 67% 11% 4 3 1	2764
	21st to end	Night	15% 65% 8% 6% 4 2	2850
December	1st to 10th	Night	14% 67% 9% 5% 4 1	2850
	11th to 20th	Night	21% 59% 14% 3 3	3507
	21st to end	Night	21% 45% 15% 7% 7% 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% 17% 5% 1	506
April	1st to 10th	Day	18% 25% 38% 14% 5%	460
	11th to 20th	Day	16% 26% 33% 16% 7% 2	452
	21st to end	Day	22% 23% 30% 17% 7% 2	460
May	1st to 10th	Day	20% 22% 27% 20% 9% 2	463
	11th to 20th	Day	20% 12% 24% 24% 17% 3	637
	21st to end	Day	24% 14% 21% 23% 14% 3	734
June	1st to 10th	Day	19% 18% 28% 24% 9% 1	680
	11th to 20th	Day	23% 21% 27% 21% 7% 1	680
	21st to end	Day	16% 14% 29% 27% 12% 3	680
July	1st to 10th	Day	13% 14% 28% 27% 15% 3	671
	11th to 20th	Day	13% 18% 30% 25% 12% 2	668
	21st to end	Day	8% 17% 35% 26% 11% 3	579
August	1st to 10th	Day	15% 16% 36% 21% 10% 2	487
	11th to 20th	Day	14% 19% 33% 25% 8% 1	477
	21st to end	Day	17% 21% 33% 19% 8% 1	539
September	1st to 10th	Day	19% 26% 29% 16% 8% 2	490
	11th to 20th	Day	22% 18% 34% 19% 5% 1	490
	21st to end	Day	25% 28% 28% 15% 3 1	490
October	1st to 10th	Day	21% 24% 28% 19% 6% 1	453
	11th to 20th	Day	21% 27% 28% 18% 6% 1	300
	21st to end	Day	20% 30% 30% 14% 5% 1	330
November	1st to 10th	Day	17% 32% 35% 10% 6% 1	279
	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	10% 21% 34% 26% 8% 1	755
	11th to 20th	Night	8% 21% 35% 29% 7% 1	563
	21st to end	Night	12% 18% 35% 24% 9% 1	570
May	1st to 10th	Night	13% 13% 30% 29% 13% 1	439
	11th to 20th	Night	13% 10% 24% 31% 20% 3	374
	21st to end	Night	21% 11% 26% 24% 16% 2	411
June	1st to 10th	Night	18% 14% 27% 28% 11% 2	380
	11th to 20th	Night	22% 13% 30% 22% 12% 1	380
	21st to end	Night	12% 10% 27% 30% 20% 1	380
July	1st to 10th	Night	9% 6% 24% 40% 20% 1	370
	11th to 20th	Night	11% 11% 26% 34% 17% 2	368
	21st to end	Night	7% 8% 23% 41% 20% 1	416
August	1st to 10th	Night	9% 8% 17% 41% 23% 1	378
	11th to 20th	Night	10% 9% 20% 38% 20% 2	499
	21st to end	Night	14% 13% 25% 32% 15% 1	627
September	1st to 10th	Night	12% 13% 27% 30% 14% 4	731
	11th to 20th	Night	13% 15% 27% 26% 13% 6%	760
	21st to end	Night	18% 20% 30% 20% 9% 3	760
October	1st to 10th	Night	16% 16% 32% 26% 9% 2	760
	11th to 20th	Night	12% 22% 32% 27% 6% 1	760
	21st to end	Night	14% 22% 38% 20% 5% 1	836
November	1st to 10th	Night	13% 30% 38% 14% 5%	784
	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

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