Restoule Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Restoule Provincial Park clear sky chart from 2005-11-06 to 2025-07-21.

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	16% 12% 4 9% 5% 4 4 3 5% 6% 30%	120235
	Night	15% 14% 5% 10% 6% 4 4 3 4 6% 28%	118910
Transparency	Day	54% 5% 11% 20% 9% 1	123824
	Night	57% 5% 10% 17% 9% 1	123482
Seeing	Day	23% 16% 31% 20% 8% 2	15986
	Night	24% 13% 30% 24% 9% 1	24988

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	11% 20% 9% 13% 9% 6% 5% 3 4 4 16%	3158
	11th to 20th	Day	10% 17% 8% 18% 7% 6% 5% 4 5% 5% 16%	3404
	21st to end	Day	12% 20% 8% 16% 7% 4 4 3 4 4 18%	4466
February	1st to 10th	Day	11% 20% 7% 14% 8% 5% 4 4 4 5% 20%	1800
	11th to 20th	Day	11% 17% 6% 13% 7% 4 4 3 4 6% 23%	1753
	21st to end	Day	15% 18% 5% 12% 7% 5% 4 3 4 3 22%	1505
March	1st to 10th	Day	19% 15% 5% 10% 5% 4 5% 3 4 4 26%	4885
	11th to 20th	Day	12% 15% 6% 13% 5% 4 4 3 5% 7% 25%	4980
	21st to end	Day	16% 16% 6% 9% 5% 5% 3 2 4 4 30%	5465
April	1st to 10th	Day	21% 14% 4 7% 4 4 4 3 5% 6% 28%	2368
	11th to 20th	Day	20% 13% 3 6% 4 3 4 4 4 6% 34%	2522
	21st to end	Day	22% 12% 3 7% 4 4 3 2 4 5% 35%	2600
May	1st to 10th	Day	18% 10% 3 7% 5% 4 4 3 5% 7% 34%	6026
	11th to 20th	Day	13% 9% 3 7% 5% 4 4 3 6% 8% 38%	6318
	21st to end	Day	21% 10% 3 7% 4 4 3 3 4 6% 36%	6949
June	1st to 10th	Day	18% 9% 3 7% 4 5% 5% 4 6% 7% 34%	2935
	11th to 20th	Day	14% 6% 3 6% 5% 5% 5% 4 6% 8% 39%	3000
	21st to end	Day	20% 8% 3 6% 5% 5% 5% 4 5% 7% 33%	3000
July	1st to 10th	Day	16% 7% 2 7% 5% 5% 4 4 5% 8% 36%	4910
	11th to 20th	Day	14% 6% 2 6% 5% 4 5% 4 6% 9% 39%	4859
	21st to end	Day	12% 6% 2 6% 3 4 4 4 5% 7% 48%	4689
August	1st to 10th	Day	12% 7% 3 7% 5% 5% 5% 5% 6% 9% 36%	4104
	11th to 20th	Day	18% 7% 3 6% 4 4 5% 4 5% 8% 36%	4044
	21st to end	Day	10% 6% 2 6% 5% 4 4 4 6% 7% 45%	4440
September	1st to 10th	Day	17% 9% 2 6% 4 4 3 3 5% 7% 40%	2280
	11th to 20th	Day	16% 8% 2 5% 5% 4 5% 3 5% 7% 41%	2166
	21st to end	Day	23% 8% 4 6% 5% 4 5% 3 4 6% 33%	2056
October	1st to 10th	Day	17% 11% 3 8% 5% 4 4 3 4 7% 34%	1900
	11th to 20th	Day	24% 15% 4 7% 5% 4 4 3 4 6% 24%	1900
	21st to end	Day	29% 15% 4 9% 5% 4 4 3 4 4 20%	2053
November	1st to 10th	Day	19% 17% 4 8% 4 4 4 3 5% 7% 24%	1590
	11th to 20th	Day	18% 19% 6% 11% 7% 5% 4 3 4 5% 20%	1600
	21st to end	Day	24% 20% 6% 12% 6% 5% 4 3 4 4 13%	1600
December	1st to 10th	Day	15% 23% 10% 15% 8% 7% 4 4 3 3 9%	2600
	11th to 20th	Day	15% 20% 6% 14% 6% 6% 4 2 3 4 22%	2834
	21st to end	Day	20% 22% 8% 17% 5% 3 3 4 3 3 13%	3476
January	1st to 10th	Night	12% 19% 8% 14% 10% 6% 4 3 4 4 17%	6808
	11th to 20th	Night	10% 18% 8% 18% 8% 5% 5% 3 4 5% 17%	6473
	21st to end	Night	10% 21% 9% 15% 6% 6% 5% 3 4 4 17%	6490
February	1st to 10th	Night	11% 17% 6% 13% 8% 6% 4 4 4 5% 23%	2600
	11th to 20th	Night	12% 17% 6% 13% 7% 5% 4 3 5% 5% 24%	2533
	21st to end	Night	13% 18% 6% 11% 7% 6% 6% 3 5% 5% 22%	2123
March	1st to 10th	Night	15% 15% 4 9% 5% 4 5% 3 5% 6% 29%	4954
	11th to 20th	Night	12% 18% 5% 10% 5% 4 4 4 6% 6% 25%	4979
	21st to end	Night	17% 15% 5% 9% 5% 5% 4 2 4 5% 30%	5467
April	1st to 10th	Night	20% 15% 4 7% 5% 4 4 3 4 5% 29%	2031
	11th to 20th	Night	19% 11% 3 6% 5% 4 4 2 4 5% 37%	1843
	21st to end	Night	21% 12% 4 8% 4 5% 4 4 5% 5% 30%	1800
May	1st to 10th	Night	15% 10% 2 6% 4 5% 4 4 5% 8% 37%	3900
	11th to 20th	Night	10% 6% 2 7% 4 4 5% 3 6% 8% 44%	3575
	21st to end	Night	16% 10% 3 7% 5% 4 4 4 5% 7% 35%	3926
June	1st to 10th	Night	13% 8% 3 8% 6% 5% 4 5% 5% 7% 35%	1460
	11th to 20th	Night	15% 5% 1 5% 3 4 4 3 6% 9% 43%	1400
	21st to end	Night	15% 8% 2 7% 5% 4 4 4 7% 7% 37%	1400
July	1st to 10th	Night	14% 7% 2 7% 4 4 3 4 5% 7% 44%	2280
	11th to 20th	Night	16% 7% 2 5% 4 3 4 3 6% 6% 43%	2329
	21st to end	Night	11% 6% 2 5% 4 4 4 4 5% 7% 48%	2860
August	1st to 10th	Night	11% 8% 2 6% 4 4 4 4 5% 7% 43%	2825
	11th to 20th	Night	14% 7% 2 7% 4 4 4 3 6% 6% 42%	2785
	21st to end	Night	16% 5% 2 5% 3 3 4 3 4 7% 48%	3183
September	1st to 10th	Night	16% 5% 2 4 3 4 4 3 5% 6% 48%	1900
	11th to 20th	Night	15% 7% 2 6% 3 4 3 3 4 6% 46%	2011
	21st to end	Night	18% 8% 2 6% 4 4 3 3 5% 6% 41%	2123
October	1st to 10th	Night	18% 9% 3 8% 5% 4 4 4 5% 6% 34%	2280
	11th to 20th	Night	25% 13% 3 7% 5% 4 4 3 4 5% 26%	2280
	21st to end	Night	26% 16% 5% 8% 4 4 4 3 4 4 22%	2541
November	1st to 10th	Night	19% 15% 4 7% 5% 4 4 3 4 5% 29%	2707
	11th to 20th	Night	17% 17% 6% 11% 6% 4 4 3 5% 5% 23%	2800
	21st to end	Night	22% 19% 6% 10% 7% 4 4 3 3 5% 16%	2800
December	1st to 10th	Night	17% 24% 6% 15% 7% 5% 5% 3 4 4 9%	4580
	11th to 20th	Night	15% 19% 6% 15% 7% 5% 4 3 4 4 18%	5362
	21st to end	Night	19% 21% 6% 17% 6% 4 4 3 3 4 13%	7502

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	72% 4 7% 12% 4	3159
	11th to 20th	Day	70% 4 9% 9% 6%	3432
	21st to end	Day	71% 3 7% 11% 8% 1	4466
February	1st to 10th	Day	68% 4 8% 13% 6% 1	1800
	11th to 20th	Day	64% 3 10% 13% 9% 1	1762
	21st to end	Day	67% 3 7% 15% 7%	1505
March	1st to 10th	Day	62% 4 9% 10% 13% 2	4888
	11th to 20th	Day	58% 4 14% 15% 8% 1	4980
	21st to end	Day	59% 3 9% 18% 9% 2	5465
April	1st to 10th	Day	58% 3 10% 17% 10% 2	2368
	11th to 20th	Day	52% 4 8% 22% 13% 1	2522
	21st to end	Day	54% 4 7% 17% 14% 3	2600
May	1st to 10th	Day	50% 5% 11% 19% 10% 5%	6035
	11th to 20th	Day	43% 6% 11% 23% 15% 2	6322
	21st to end	Day	50% 4 11% 19% 14% 2	6949
June	1st to 10th	Day	50% 6% 10% 22% 12% 1	2935
	11th to 20th	Day	43% 7% 10% 25% 14% 1	3000
	21st to end	Day	50% 6% 12% 19% 11% 1	3000
July	1st to 10th	Day	46% 6% 14% 23% 10% 1	4836
	11th to 20th	Day	40% 6% 16% 30% 7%	4778
	21st to end	Day	36% 5% 12% 31% 16%	4540
August	1st to 10th	Day	43% 7% 12% 30% 8%	4091
	11th to 20th	Day	44% 7% 14% 26% 8%	4083
	21st to end	Day	37% 6% 12% 35% 10%	4440
September	1st to 10th	Day	45% 6% 13% 25% 12%	2280
	11th to 20th	Day	42% 6% 13% 29% 11%	2166
	21st to end	Day	53% 5% 11% 23% 8%	2056
October	1st to 10th	Day	48% 5% 12% 26% 8%	3160
	11th to 20th	Day	54% 6% 14% 20% 6%	3140
	21st to end	Day	67% 5% 13% 12% 4	3367
November	1st to 10th	Day	60% 6% 12% 17% 5%	1590
	11th to 20th	Day	67% 5% 10% 12% 6% 1	1600
	21st to end	Day	76% 5% 8% 8% 3	1600
December	1st to 10th	Day	81% 4 7% 6% 1	2600
	11th to 20th	Day	69% 5% 6% 14% 6%	2833
	21st to end	Day	77% 3 5% 12% 2	3476
January	1st to 10th	Night	72% 5% 7% 12% 4	6808
	11th to 20th	Night	70% 5% 10% 8% 7%	6520
	21st to end	Night	71% 3 6% 9% 9% 1	6490
February	1st to 10th	Night	65% 4 9% 14% 7% 1	2600
	11th to 20th	Night	63% 4 11% 16% 6% 1	2535
	21st to end	Night	65% 4 9% 15% 7% 1	2123
March	1st to 10th	Night	57% 4 9% 13% 12% 4	4964
	11th to 20th	Night	58% 5% 14% 14% 8% 1	4980
	21st to end	Night	59% 3 6% 18% 12% 2	5467
April	1st to 10th	Night	58% 4 7% 18% 11% 2	2031
	11th to 20th	Night	51% 4 7% 22% 15% 2	1843
	21st to end	Night	56% 4 7% 14% 16% 3	1800
May	1st to 10th	Night	45% 5% 9% 23% 15% 3	3907
	11th to 20th	Night	37% 7% 13% 22% 19% 3	3576
	21st to end	Night	47% 5% 10% 22% 13% 2	3927
June	1st to 10th	Night	48% 6% 10% 23% 11% 3	1460
	11th to 20th	Night	38% 6% 10% 27% 18% 1	1400
	21st to end	Night	45% 6% 14% 22% 12% 1	1400
July	1st to 10th	Night	40% 5% 13% 27% 13% 2	2245
	11th to 20th	Night	41% 6% 15% 29% 8% 1	2287
	21st to end	Night	35% 6% 11% 29% 18% 1	2769
August	1st to 10th	Night	39% 6% 15% 27% 12% 2	2814
	11th to 20th	Night	41% 7% 18% 25% 8% 1	2812
	21st to end	Night	36% 5% 14% 32% 12% 1	3183
September	1st to 10th	Night	37% 6% 15% 30% 11% 2	1900
	11th to 20th	Night	39% 6% 14% 29% 12%	2011
	21st to end	Night	45% 4 14% 26% 10%	2123
October	1st to 10th	Night	44% 6% 10% 28% 12%	3800
	11th to 20th	Night	54% 4 13% 23% 6%	3779
	21st to end	Night	60% 5% 18% 12% 5%	4177
November	1st to 10th	Night	57% 5% 13% 19% 5%	2707
	11th to 20th	Night	63% 5% 12% 14% 5% 1	2800
	21st to end	Night	71% 6% 11% 9% 3	2800
December	1st to 10th	Night	79% 5% 8% 6% 2	4580
	11th to 20th	Night	70% 4 7% 10% 8%	5362
	21st to end	Night	76% 4 6% 11% 3	7502

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	25% 25% 25% 20% 5% 2	200
	11th to 20th	Day	18% 19% 35% 21% 6% 1	225
	21st to end	Day	25% 17% 33% 18% 7% 1	330
February	1st to 10th	Day	28% 29% 31% 9% 1 1	300
	11th to 20th	Day	22% 26% 40% 11% 1	300
	21st to end	Day	31% 25% 32% 11%	249
March	1st to 10th	Day	25% 20% 37% 15% 4	477
	11th to 20th	Day	22% 21% 35% 17% 4 1	500
	21st to end	Day	29% 21% 28% 17% 4 1	550
April	1st to 10th	Day	26% 20% 31% 16% 6% 1	500
	11th to 20th	Day	34% 17% 21% 16% 9% 3	492
	21st to end	Day	29% 20% 29% 16% 5% 2	500
May	1st to 10th	Day	28% 13% 30% 19% 8% 2	503
	11th to 20th	Day	20% 17% 29% 19% 12% 3	527
	21st to end	Day	20% 14% 31% 23% 11% 2	573
June	1st to 10th	Day	20% 13% 35% 24% 7% 1	665
	11th to 20th	Day	16% 14% 37% 22% 9% 2	730
	21st to end	Day	24% 11% 34% 20% 10% 2	730
July	1st to 10th	Day	15% 10% 29% 33% 11% 2	721
	11th to 20th	Day	16% 12% 29% 27% 13% 3	693
	21st to end	Day	12% 8% 32% 29% 14% 4	532
August	1st to 10th	Day	17% 8% 25% 30% 15% 5%	486
	11th to 20th	Day	19% 5% 23% 27% 18% 8%	479
	21st to end	Day	17% 10% 30% 25% 14% 4	539
September	1st to 10th	Day	18% 14% 28% 23% 12% 4	490
	11th to 20th	Day	17% 7% 27% 26% 15% 8%	490
	21st to end	Day	26% 12% 24% 23% 13% 3	490
October	1st to 10th	Day	22% 17% 27% 22% 9% 3	490
	11th to 20th	Day	26% 20% 35% 14% 4 1	490
	21st to end	Day	38% 17% 29% 13% 2	502
November	1st to 10th	Day	30% 23% 32% 11% 4	213
	11th to 20th	Day	29% 21% 36% 12% 3	200
	21st to end	Day	32% 22% 34% 11% 1 1	200
December	1st to 10th	Day	29% 18% 34% 17% 3	200
	11th to 20th	Day	31% 22% 31% 13% 4 1	200
	21st to end	Day	31% 22% 29% 13% 4 1	220
January	1st to 10th	Night	26% 15% 34% 19% 5% 1	1000
	11th to 20th	Night	27% 16% 29% 22% 5% 1	923
	21st to end	Night	21% 12% 32% 24% 9% 1	880
February	1st to 10th	Night	20% 19% 36% 19% 5%	800
	11th to 20th	Night	22% 17% 35% 21% 5%	783
	21st to end	Night	23% 18% 37% 19% 3	660
March	1st to 10th	Night	21% 20% 34% 21% 4	800
	11th to 20th	Night	22% 20% 33% 20% 6%	800
	21st to end	Night	21% 14% 33% 25% 6% 1	880
April	1st to 10th	Night	31% 12% 32% 21% 5%	800
	11th to 20th	Night	26% 16% 26% 22% 10%	659
	21st to end	Night	26% 12% 27% 26% 9% 1	600
May	1st to 10th	Night	22% 8% 28% 31% 10%	538
	11th to 20th	Night	19% 7% 34% 31% 9%	394
	21st to end	Night	18% 9% 32% 31% 9%	433
June	1st to 10th	Night	15% 8% 34% 32% 12%	400
	11th to 20th	Night	17% 10% 26% 37% 11%	400
	21st to end	Night	17% 7% 30% 33% 13% 1	400
July	1st to 10th	Night	15% 4 28% 40% 11% 1	390
	11th to 20th	Night	14% 5% 27% 36% 16% 1	388
	21st to end	Night	13% 7% 27% 36% 17% 1	488
August	1st to 10th	Night	17% 4 24% 36% 18% 2	567
	11th to 20th	Night	14% 5% 22% 35% 21% 2	564
	21st to end	Night	19% 7% 26% 30% 16% 2	660
September	1st to 10th	Night	19% 6% 27% 30% 17% 2	760
	11th to 20th	Night	19% 7% 25% 25% 20% 3	760
	21st to end	Night	22% 9% 23% 28% 16% 2	760
October	1st to 10th	Night	24% 12% 28% 25% 9% 2	760
	11th to 20th	Night	33% 14% 27% 19% 7% 1	760
	21st to end	Night	35% 15% 28% 18% 4	836
November	1st to 10th	Night	30% 14% 29% 20% 7% 1	780
	11th to 20th	Night	25% 18% 32% 19% 7%	800
	21st to end	Night	34% 15% 29% 18% 4	800
December	1st to 10th	Night	30% 17% 30% 17% 4 1	800
	11th to 20th	Night	26% 18% 33% 17% 3 2	865
	21st to end	Night	32% 15% 28% 20% 4	1100

Page generated at 2025-07-18 01:10:01. Version ac07

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