Mount Carleton Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mount Carleton Provincial Park clear sky chart from 2005-11-06 to 2024-11-02.

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	18% 13% 4 10% 6% 5% 4 3 5% 6% 26%	101623
	Night	17% 14% 4 10% 6% 5% 4 3 4 5% 26%	97435
Transparency	Day	58% 6% 12% 16% 7% 1	101368
	Night	59% 6% 11% 16% 7% 1	97311
Seeing	Day	29% 19% 29% 16% 6% 1	16219
	Night	25% 18% 28% 21% 7% 1	23999

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	14% 16% 6% 12% 8% 9% 5% 3 3 4 19%	2207
	11th to 20th	Day	11% 15% 8% 18% 16% 7% 4 3 4 2 12%	2369
	21st to end	Day	7% 10% 6% 20% 7% 6% 6% 4 5% 6% 24%	2809
February	1st to 10th	Day	12% 15% 5% 12% 10% 9% 6% 4 5% 4 18%	1710
	11th to 20th	Day	13% 19% 6% 15% 8% 6% 6% 3 4 4 16%	1663
	21st to end	Day	10% 15% 6% 13% 8% 8% 6% 4 4 5% 22%	1517
March	1st to 10th	Day	17% 19% 4 9% 4 5% 6% 4 3 5% 23%	3235
	11th to 20th	Day	15% 27% 6% 11% 7% 4 3 3 3 4 16%	3480
	21st to end	Day	22% 18% 6% 12% 5% 3 3 2 3 4 22%	3816
April	1st to 10th	Day	18% 20% 5% 11% 4 4 4 3 3 5% 23%	2271
	11th to 20th	Day	19% 16% 4 8% 5% 4 3 2 4 5% 29%	2442
	21st to end	Day	22% 15% 5% 8% 4 3 3 3 4 5% 28%	2470
May	1st to 10th	Day	18% 18% 4 10% 5% 4 4 3 4 5% 24%	4106
	11th to 20th	Day	20% 11% 3 8% 4 4 5% 3 5% 7% 29%	4410
	21st to end	Day	20% 10% 3 8% 6% 5% 5% 3 6% 6% 27%	5185
June	1st to 10th	Day	25% 10% 3 7% 4 5% 5% 4 5% 6% 26%	2850
	11th to 20th	Day	22% 9% 3 7% 5% 5% 4 4 6% 7% 29%	2850
	21st to end	Day	26% 11% 3 8% 5% 5% 4 4 4 6% 23%	2850
July	1st to 10th	Day	18% 9% 3 9% 5% 6% 5% 4 6% 7% 27%	4760
	11th to 20th	Day	18% 8% 3 7% 6% 5% 5% 5% 6% 8% 29%	4760
	21st to end	Day	16% 7% 2 6% 5% 5% 5% 4 7% 8% 35%	4868
August	1st to 10th	Day	18% 7% 3 8% 5% 6% 5% 5% 6% 7% 29%	4105
	11th to 20th	Day	17% 9% 4 9% 6% 6% 6% 5% 6% 8% 24%	4045
	21st to end	Day	20% 8% 2 6% 4 5% 4 4 5% 7% 35%	4532
September	1st to 10th	Day	22% 9% 3 7% 3 3 3 4 5% 6% 36%	2292
	11th to 20th	Day	21% 9% 2 6% 3 3 3 2 4 5% 41%	2090
	21st to end	Day	20% 11% 2 6% 4 3 4 3 6% 6% 35%	2090
October	1st to 10th	Day	17% 14% 3 8% 4 3 4 2 6% 6% 35%	1943
	11th to 20th	Day	23% 17% 3 7% 3 4 4 3 4 5% 27%	1900
	21st to end	Day	25% 19% 5% 7% 4 3 4 3 4 4 22%	1910
November	1st to 10th	Day	19% 21% 5% 8% 4 4 3 2 5% 4 24%	1585
	11th to 20th	Day	19% 18% 6% 15% 4 5% 3 3 4 4 20%	1520
	21st to end	Day	16% 19% 5% 17% 6% 4 4 3 5% 4 18%	1520
December	1st to 10th	Day	20% 19% 8% 13% 8% 4 4 2 3 4 15%	1364
	11th to 20th	Day	15% 19% 7% 15% 8% 6% 5% 3 4 3 15%	1668
	21st to end	Day	16% 17% 5% 18% 10% 4 4 2 2 3 20%	2431
January	1st to 10th	Night	8% 16% 7% 17% 12% 10% 5% 3 5% 4 12%	4748
	11th to 20th	Night	13% 16% 6% 17% 12% 5% 4 4 3 3 17%	4592
	21st to end	Night	8% 13% 7% 16% 6% 6% 5% 4 4 6% 26%	4845
February	1st to 10th	Night	11% 15% 5% 12% 7% 9% 6% 3 5% 5% 22%	2470
	11th to 20th	Night	13% 19% 6% 12% 8% 7% 7% 4 4 3 17%	2403
	21st to end	Night	10% 16% 5% 11% 9% 7% 5% 3 4 4 25%	1934
March	1st to 10th	Night	16% 15% 4 10% 6% 5% 6% 4 4 5% 26%	3604
	11th to 20th	Night	19% 26% 5% 10% 5% 4 4 3 3 3 19%	3479
	21st to end	Night	26% 15% 6% 10% 4 4 3 2 3 6% 21%	3816
April	1st to 10th	Night	21% 18% 3 10% 6% 5% 3 2 3 3 27%	1905
	11th to 20th	Night	19% 13% 3 6% 4 4 4 3 5% 5% 34%	1688
	21st to end	Night	22% 11% 4 6% 4 4 3 3 5% 6% 31%	1710
May	1st to 10th	Night	20% 14% 3 6% 5% 3 3 3 5% 6% 31%	2834
	11th to 20th	Night	18% 11% 2 6% 5% 4 5% 3 6% 6% 33%	2513
	21st to end	Night	20% 9% 2 7% 5% 4 5% 4 5% 7% 32%	2409
June	1st to 10th	Night	20% 10% 3 7% 5% 4 4 4 5% 7% 32%	1330
	11th to 20th	Night	18% 7% 3 7% 4 5% 5% 4 6% 7% 34%	1330
	21st to end	Night	22% 11% 3 9% 5% 4 5% 3 6% 6% 26%	1330
July	1st to 10th	Night	16% 11% 3 7% 5% 5% 5% 4 5% 7% 32%	2210
	11th to 20th	Night	22% 9% 3 7% 4 4 4 3 6% 6% 31%	2210
	21st to end	Night	17% 8% 3 6% 4 4 4 4 5% 6% 39%	2652
August	1st to 10th	Night	19% 8% 3 7% 6% 5% 5% 5% 6% 7% 28%	2825
	11th to 20th	Night	16% 7% 3 8% 5% 5% 6% 4 7% 8% 30%	2782
	21st to end	Night	17% 9% 2 6% 4 3 3 3 5% 7% 42%	3124
September	1st to 10th	Night	18% 6% 2 5% 4 3 5% 4 5% 6% 42%	1883
	11th to 20th	Night	19% 9% 3 5% 3 3 3 3 5% 6% 42%	2090
	21st to end	Night	19% 8% 2 6% 4 3 4 3 5% 6% 40%	2090
October	1st to 10th	Night	20% 10% 3 6% 4 4 4 3 5% 5% 37%	2237
	11th to 20th	Night	22% 15% 3 6% 4 3 4 3 5% 5% 30%	2280
	21st to end	Night	21% 19% 4 8% 4 3 3 3 4 6% 24%	2687
November	1st to 10th	Night	21% 16% 5% 8% 5% 4 4 3 4 6% 26%	2526
	11th to 20th	Night	19% 17% 6% 13% 5% 4 3 2 5% 5% 21%	2660
	21st to end	Night	17% 17% 6% 17% 6% 4 4 3 4 4 18%	2660
December	1st to 10th	Night	18% 17% 7% 15% 9% 5% 3 3 3 4 16%	2812
	11th to 20th	Night	19% 21% 7% 12% 9% 7% 4 3 3 3 13%	3531
	21st to end	Night	17% 18% 6% 14% 9% 5% 3 2 3 4 19%	5236

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	66% 8% 12% 10% 4	2208
	11th to 20th	Day	76% 5% 6% 9% 5%	2369
	21st to end	Day	58% 7% 8% 16% 11% 1	2809
February	1st to 10th	Day	66% 6% 9% 10% 7% 1	1710
	11th to 20th	Day	70% 6% 7% 12% 5% 1	1671
	21st to end	Day	63% 6% 7% 16% 7% 1	1517
March	1st to 10th	Day	62% 6% 10% 12% 8% 1	3239
	11th to 20th	Day	72% 6% 6% 12% 3 1	3480
	21st to end	Day	68% 3 5% 14% 8% 2	3816
April	1st to 10th	Day	64% 4 9% 12% 9% 2	2271
	11th to 20th	Day	57% 5% 8% 19% 9% 2	2442
	21st to end	Day	60% 5% 7% 16% 10% 3	2470
May	1st to 10th	Day	61% 6% 10% 17% 6% 1	4120
	11th to 20th	Day	53% 8% 15% 16% 8%	4414
	21st to end	Day	53% 8% 11% 18% 10%	5185
June	1st to 10th	Day	56% 8% 10% 16% 9% 1	2850
	11th to 20th	Day	54% 6% 12% 18% 9% 1	2850
	21st to end	Day	61% 7% 11% 15% 6%	2850
July	1st to 10th	Day	54% 6% 15% 16% 9%	4685
	11th to 20th	Day	51% 6% 18% 21% 4	4679
	21st to end	Day	45% 7% 18% 21% 8%	4712
August	1st to 10th	Day	52% 7% 17% 17% 7%	4092
	11th to 20th	Day	55% 7% 17% 17% 3	4084
	21st to end	Day	48% 5% 16% 18% 12%	4532
September	1st to 10th	Day	48% 6% 14% 23% 9%	2292
	11th to 20th	Day	47% 4 12% 26% 11%	2090
	21st to end	Day	49% 6% 11% 25% 10%	2090
October	1st to 10th	Day	51% 4 14% 23% 8% 1	1943
	11th to 20th	Day	59% 7% 12% 16% 6%	1900
	21st to end	Day	67% 4 8% 14% 6%	1910
November	1st to 10th	Day	63% 6% 10% 16% 5%	1585
	11th to 20th	Day	68% 6% 10% 11% 5%	1520
	21st to end	Day	69% 6% 12% 11% 1	1520
December	1st to 10th	Day	74% 5% 8% 9% 4	1364
	11th to 20th	Day	72% 6% 8% 10% 4	1668
	21st to end	Day	71% 5% 9% 9% 5% 2	2431
January	1st to 10th	Night	71% 9% 9% 10% 1	4748
	11th to 20th	Night	70% 5% 7% 11% 6%	4592
	21st to end	Night	57% 5% 9% 16% 10% 2	4845
February	1st to 10th	Night	63% 5% 10% 13% 8% 1	2470
	11th to 20th	Night	69% 7% 7% 10% 6% 1	2406
	21st to end	Night	61% 6% 9% 14% 9% 1	1934
March	1st to 10th	Night	62% 5% 9% 18% 6% 1	3613
	11th to 20th	Night	71% 6% 6% 12% 5%	3480
	21st to end	Night	66% 3 8% 14% 9% 1	3816
April	1st to 10th	Night	64% 5% 6% 13% 10% 3	1905
	11th to 20th	Night	51% 5% 9% 19% 15% 1	1688
	21st to end	Night	52% 6% 9% 18% 13% 2	1710
May	1st to 10th	Night	51% 9% 13% 14% 12% 1	2840
	11th to 20th	Night	50% 7% 14% 20% 9% 1	2514
	21st to end	Night	49% 8% 12% 19% 10%	2410
June	1st to 10th	Night	52% 6% 12% 19% 10% 1	1330
	11th to 20th	Night	47% 7% 15% 18% 11% 2	1330
	21st to end	Night	58% 7% 11% 14% 9% 1	1330
July	1st to 10th	Night	50% 7% 14% 21% 8%	2175
	11th to 20th	Night	53% 6% 17% 19% 5% 1	2168
	21st to end	Night	44% 8% 18% 21% 9%	2568
August	1st to 10th	Night	53% 8% 15% 19% 5%	2813
	11th to 20th	Night	48% 9% 21% 17% 4	2809
	21st to end	Night	42% 6% 15% 22% 13% 1	3124
September	1st to 10th	Night	41% 8% 15% 27% 9% 1	1883
	11th to 20th	Night	43% 4 16% 25% 11%	2090
	21st to end	Night	43% 7% 11% 25% 12% 1	2090
October	1st to 10th	Night	49% 5% 13% 23% 10% 1	2237
	11th to 20th	Night	56% 6% 12% 21% 6%	2280
	21st to end	Night	62% 5% 11% 16% 5% 1	2687
November	1st to 10th	Night	60% 5% 13% 16% 6%	2526
	11th to 20th	Night	67% 5% 11% 13% 5% 1	2660
	21st to end	Night	71% 6% 11% 9% 3 1	2660
December	1st to 10th	Night	73% 5% 9% 10% 3	2812
	11th to 20th	Night	76% 5% 6% 9% 3	3532
	21st to end	Night	69% 5% 10% 10% 5% 1	5236

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	32% 21% 31% 12% 3 1	180
	11th to 20th	Day	36% 26% 24% 11% 2 1	180
	21st to end	Day	23% 23% 33% 12% 6% 2	222
February	1st to 10th	Day	26% 25% 28% 15% 5% 1	370
	11th to 20th	Day	28% 27% 29% 12% 3	366
	21st to end	Day	29% 26% 28% 12% 3 1	357
March	1st to 10th	Day	28% 22% 36% 12% 2 1	460
	11th to 20th	Day	30% 21% 29% 13% 6% 1	460
	21st to end	Day	31% 23% 27% 12% 4 2	506
April	1st to 10th	Day	34% 27% 27% 9% 3 1	460
	11th to 20th	Day	35% 19% 28% 13% 4 1	452
	21st to end	Day	33% 22% 26% 14% 3 2	460
May	1st to 10th	Day	38% 15% 28% 14% 3 1	463
	11th to 20th	Day	28% 17% 28% 18% 8% 1	665
	21st to end	Day	33% 19% 28% 15% 5%	735
June	1st to 10th	Day	32% 18% 27% 15% 7% 1	680
	11th to 20th	Day	28% 18% 25% 19% 9% 1	680
	21st to end	Day	32% 14% 31% 17% 6% 1	680
July	1st to 10th	Day	22% 17% 32% 19% 8% 1	670
	11th to 20th	Day	19% 15% 33% 23% 8% 1	668
	21st to end	Day	22% 13% 35% 23% 6% 1	598
August	1st to 10th	Day	21% 16% 36% 19% 7% 1	486
	11th to 20th	Day	23% 14% 29% 27% 8%	479
	21st to end	Day	24% 16% 29% 19% 12% 1	539
September	1st to 10th	Day	25% 18% 30% 18% 8% 1	490
	11th to 20th	Day	26% 14% 32% 18% 7% 2	490
	21st to end	Day	27% 19% 28% 14% 8% 4	490
October	1st to 10th	Day	26% 19% 26% 18% 8% 3	413
	11th to 20th	Day	37% 17% 22% 16% 7% 1	390
	21st to end	Day	40% 20% 24% 10% 5%	429
November	1st to 10th	Day	37% 19% 24% 15% 5%	369
	11th to 20th	Day	31% 25% 26% 13% 5% 1	370
	21st to end	Day	31% 25% 26% 13% 4 1	370
December	1st to 10th	Day	33% 22% 28% 11% 5% 1	214
	11th to 20th	Day	35% 28% 27% 8% 2	180
	21st to end	Day	35% 28% 26% 9% 3	198
January	1st to 10th	Night	24% 23% 34% 14% 4	850
	11th to 20th	Night	26% 25% 28% 16% 4	801
	21st to end	Night	17% 22% 33% 22% 5%	836
February	1st to 10th	Night	20% 30% 28% 16% 5% 1	760
	11th to 20th	Night	27% 24% 31% 14% 3	743
	21st to end	Night	20% 19% 39% 17% 4 1	628
March	1st to 10th	Night	22% 20% 36% 18% 4	760
	11th to 20th	Night	27% 21% 28% 16% 8% 1	760
	21st to end	Night	23% 20% 29% 21% 6% 1	836
April	1st to 10th	Night	32% 20% 25% 19% 4	675
	11th to 20th	Night	28% 18% 27% 20% 8%	564
	21st to end	Night	33% 14% 25% 21% 6% 1	570
May	1st to 10th	Night	30% 14% 24% 27% 5% 1	570
	11th to 20th	Night	29% 10% 30% 24% 6% 1	562
	21st to end	Night	21% 17% 32% 24% 5%	419
June	1st to 10th	Night	25% 7% 29% 32% 7% 1	380
	11th to 20th	Night	19% 11% 27% 31% 12%	380
	21st to end	Night	27% 11% 27% 28% 8%	380
July	1st to 10th	Night	19% 9% 34% 28% 10%	370
	11th to 20th	Night	16% 9% 30% 34% 12% 1	368
	21st to end	Night	21% 7% 25% 33% 13% 1	422
August	1st to 10th	Night	18% 8% 30% 31% 12% 1	568
	11th to 20th	Night	20% 8% 25% 35% 13% 1	562
	21st to end	Night	17% 9% 27% 31% 14% 1	627
September	1st to 10th	Night	21% 13% 30% 27% 9%	604
	11th to 20th	Night	23% 9% 29% 27% 10% 1	760
	21st to end	Night	23% 13% 27% 26% 11%	760
October	1st to 10th	Night	26% 13% 27% 24% 9% 1	760
	11th to 20th	Night	29% 15% 27% 19% 8% 1	760
	21st to end	Night	33% 22% 25% 17% 4 1	836
November	1st to 10th	Night	33% 18% 25% 19% 4	793
	11th to 20th	Night	30% 22% 24% 17% 5% 1	850
	21st to end	Night	27% 25% 29% 15% 4	850
December	1st to 10th	Night	28% 22% 28% 16% 4 1	850
	11th to 20th	Night	31% 25% 25% 15% 4	850
	21st to end	Night	30% 26% 24% 16% 4 1	935

Page generated at 2024-10-30 14:19:23. Version ac07

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