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 2024-04-10.

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	17% 12% 5% 8% 6% 3 4 4 5% 6% 30%	82917
	Night	16% 14% 5% 9% 7% 3 4 4 4 6% 28%	85857
Transparency	Day	56% 5% 11% 18% 9% 1	82616
	Night	59% 5% 11% 17% 8% 1	85693
Seeing	Day	23% 15% 30% 21% 9% 2	14228
	Night	24% 13% 30% 24% 9% 1	23485

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	15% 23% 11% 11% 6% 3 4 3 4 3 16%	2208
	11th to 20th	Day	11% 13% 8% 18% 10% 4 4 5% 5% 5% 17%	2388
	21st to end	Day	16% 21% 9% 12% 8% 3 3 3 3 4 17%	3124
February	1st to 10th	Day	11% 18% 8% 12% 10% 4 4 5% 4 5% 20%	1710
	11th to 20th	Day	12% 15% 8% 11% 8% 4 4 5% 4 6% 23%	1663
	21st to end	Day	16% 16% 6% 11% 8% 4 5% 4 4 4 23%	1432
March	1st to 10th	Day	18% 15% 5% 8% 6% 3 5% 5% 5% 5% 26%	3399
	11th to 20th	Day	9% 18% 7% 12% 7% 3 4 4 4 5% 26%	3480
	21st to end	Day	13% 13% 6% 9% 6% 4 4 4 4 5% 33%	3815
April	1st to 10th	Day	22% 13% 5% 6% 5% 3 4 4 5% 6% 28%	2239
	11th to 20th	Day	20% 11% 4 5% 4 2 4 5% 5% 6% 34%	2266
	21st to end	Day	22% 11% 3 7% 5% 2 4 3 4 5% 35%	2340
May	1st to 10th	Day	20% 9% 3 6% 6% 3 3 4 5% 7% 34%	2394
	11th to 20th	Day	19% 8% 3 6% 5% 3 4 4 6% 8% 34%	2478
	21st to end	Day	15% 7% 3 5% 5% 3 4 4 5% 7% 41%	2725
June	1st to 10th	Day	19% 7% 4 6% 4 3 5% 5% 6% 7% 35%	2641
	11th to 20th	Day	15% 6% 3 4 6% 3 6% 5% 6% 8% 39%	2700
	21st to end	Day	19% 7% 3 6% 5% 3 5% 5% 5% 8% 34%	2700
July	1st to 10th	Day	13% 4 2 5% 5% 3 4 4 6% 8% 45%	2700
	11th to 20th	Day	14% 6% 3 5% 5% 3 6% 5% 6% 9% 38%	2678
	21st to end	Day	13% 6% 2 6% 5% 3 5% 6% 6% 8% 39%	2672
August	1st to 10th	Day	15% 7% 2 5% 5% 3 5% 6% 6% 9% 38%	2327
	11th to 20th	Day	15% 6% 3 5% 5% 4 5% 6% 6% 8% 37%	2303
	21st to end	Day	15% 7% 3 6% 6% 3 5% 5% 6% 8% 37%	2524
September	1st to 10th	Day	16% 8% 3 5% 5% 3 3 4 5% 7% 40%	2160
	11th to 20th	Day	17% 8% 3 4 5% 3 5% 4 5% 7% 39%	2052
	21st to end	Day	23% 8% 4 5% 6% 3 5% 4 4 6% 32%	1948
October	1st to 10th	Day	18% 11% 3 7% 5% 3 5% 4 4 7% 33%	1800
	11th to 20th	Day	25% 14% 4 7% 6% 3 4 4 4 6% 22%	1800
	21st to end	Day	29% 15% 4 8% 6% 3 4 3 4 4 20%	1945
November	1st to 10th	Day	18% 17% 5% 7% 6% 3 4 5% 4 7% 25%	1509
	11th to 20th	Day	18% 17% 7% 10% 8% 3 4 4 4 5% 20%	1520
	21st to end	Day	24% 20% 6% 12% 6% 4 4 3 3 4 13%	1520
December	1st to 10th	Day	17% 22% 8% 10% 8% 4 5% 5% 3 4 13%	1520
	11th to 20th	Day	18% 19% 6% 10% 6% 4 4 4 3 5% 20%	1806
	21st to end	Day	20% 23% 9% 14% 6% 3 4 3 3 3 13%	2431
January	1st to 10th	Night	15% 20% 9% 13% 9% 4 5% 4 4 4 14%	4748
	11th to 20th	Night	12% 15% 6% 15% 10% 4 5% 5% 4 6% 17%	4558
	21st to end	Night	13% 23% 10% 13% 7% 4 4 3 3 3 16%	4532
February	1st to 10th	Night	12% 16% 6% 11% 9% 4 5% 5% 4 4 22%	2470
	11th to 20th	Night	12% 16% 7% 11% 8% 4 5% 4 5% 5% 25%	2403
	21st to end	Night	14% 17% 7% 10% 8% 5% 5% 4 5% 5% 22%	2020
March	1st to 10th	Night	14% 14% 4 8% 6% 3 5% 4 5% 7% 30%	3440
	11th to 20th	Night	13% 19% 6% 8% 6% 3 4 4 4 6% 28%	3479
	21st to end	Night	12% 12% 5% 8% 8% 4 4 3 4 5% 33%	3817
April	1st to 10th	Night	21% 14% 5% 7% 5% 3 4 4 5% 5% 29%	1930
	11th to 20th	Night	20% 10% 3 6% 5% 3 4 3 3 5% 38%	1657
	21st to end	Night	21% 11% 4 6% 5% 4 4 4 5% 5% 31%	1620
May	1st to 10th	Night	17% 9% 2 5% 5% 3 4 5% 5% 8% 37%	1565
	11th to 20th	Night	16% 6% 2 5% 5% 2 6% 5% 6% 8% 39%	1415
	21st to end	Night	13% 6% 3 6% 5% 3 3 4 5% 9% 42%	1550
June	1st to 10th	Night	13% 8% 4 7% 7% 4 5% 6% 5% 7% 36%	1314
	11th to 20th	Night	16% 5% 2 5% 4 2 5% 4 6% 9% 44%	1260
	21st to end	Night	14% 7% 3 6% 5% 3 5% 4 7% 8% 37%	1260
July	1st to 10th	Night	11% 5% 2 4 4 3 4 5% 7% 9% 48%	1260
	11th to 20th	Night	13% 5% 3 5% 4 3 4 4 7% 7% 44%	1282
	21st to end	Night	11% 5% 3 5% 5% 3 6% 5% 6% 8% 44%	1642
August	1st to 10th	Night	12% 7% 2 6% 4 3 4 4 6% 7% 44%	1611
	11th to 20th	Night	12% 5% 2 6% 5% 3 5% 5% 5% 7% 44%	1598
	21st to end	Night	16% 6% 3 6% 5% 2 4 5% 4 7% 41%	1813
September	1st to 10th	Night	16% 5% 2 4 4 3 4 4 5% 5% 48%	1800
	11th to 20th	Night	16% 7% 3 5% 4 3 4 4 4 6% 44%	1905
	21st to end	Night	18% 8% 3 5% 5% 3 4 4 4 6% 41%	2011
October	1st to 10th	Night	19% 9% 3 7% 6% 3 4 5% 5% 6% 34%	2160
	11th to 20th	Night	26% 12% 3 6% 6% 3 4 4 4 5% 26%	2160
	21st to end	Night	26% 16% 5% 7% 5% 3 4 4 4 4 22%	2407
November	1st to 10th	Night	19% 14% 4 7% 6% 3 4 4 4 5% 30%	2568
	11th to 20th	Night	17% 16% 6% 9% 7% 3 4 5% 5% 6% 22%	2660
	21st to end	Night	23% 18% 6% 9% 9% 3 5% 4 3 5% 17%	2660
December	1st to 10th	Night	19% 21% 9% 11% 7% 3 5% 4 4 4 13%	2660
	11th to 20th	Night	16% 20% 6% 12% 7% 4 5% 4 4 4 18%	3386
	21st to end	Night	20% 21% 7% 15% 9% 3 3 3 3 4 13%	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	73% 4 9% 10% 3	2209
	11th to 20th	Day	70% 5% 11% 9% 5% 1	2388
	21st to end	Day	74% 3 8% 10% 5% 1	3124
February	1st to 10th	Day	68% 4 8% 13% 5% 1	1710
	11th to 20th	Day	64% 3 10% 13% 9% 1	1672
	21st to end	Day	66% 3 8% 15% 8%	1432
March	1st to 10th	Day	60% 5% 12% 13% 10% 1	3402
	11th to 20th	Day	61% 4 12% 16% 7% 1	3480
	21st to end	Day	54% 3 11% 19% 10% 2	3815
April	1st to 10th	Day	59% 3 10% 16% 10% 1	2239
	11th to 20th	Day	51% 4 9% 23% 12% 1	2266
	21st to end	Day	54% 4 7% 17% 14% 3	2340
May	1st to 10th	Day	51% 4 10% 19% 14% 3	2394
	11th to 20th	Day	49% 5% 9% 22% 14% 2	2482
	21st to end	Day	43% 5% 14% 23% 13% 2	2725
June	1st to 10th	Day	49% 6% 10% 23% 12% 1	2641
	11th to 20th	Day	43% 7% 10% 25% 14% 1	2700
	21st to end	Day	49% 6% 12% 20% 11% 1	2700
July	1st to 10th	Day	37% 6% 14% 27% 15% 1	2626
	11th to 20th	Day	42% 6% 13% 28% 10% 1	2597
	21st to end	Day	43% 7% 11% 27% 11%	2523
August	1st to 10th	Day	43% 7% 14% 26% 10% 1	2314
	11th to 20th	Day	44% 7% 15% 24% 9% 1	2303
	21st to end	Day	45% 7% 14% 25% 9%	2524
September	1st to 10th	Day	45% 6% 13% 24% 12%	2160
	11th to 20th	Day	44% 6% 13% 28% 9%	2052
	21st to end	Day	54% 5% 11% 24% 6%	1948
October	1st to 10th	Day	52% 6% 13% 19% 10% 1	1800
	11th to 20th	Day	63% 6% 13% 12% 5% 1	1800
	21st to end	Day	69% 4 11% 10% 6%	1945
November	1st to 10th	Day	60% 6% 12% 17% 5%	1509
	11th to 20th	Day	67% 5% 11% 11% 6% 1	1520
	21st to end	Day	77% 5% 8% 8% 3	1520
December	1st to 10th	Day	76% 4 8% 9% 3	1520
	11th to 20th	Day	68% 7% 8% 12% 4	1805
	21st to end	Day	78% 3 6% 11% 1	2431
January	1st to 10th	Night	74% 6% 9% 8% 3	4748
	11th to 20th	Night	68% 6% 12% 10% 4	4558
	21st to end	Night	74% 3 6% 11% 5%	4532
February	1st to 10th	Night	65% 4 9% 13% 7% 1	2470
	11th to 20th	Night	62% 4 11% 16% 6% 1	2405
	21st to end	Night	65% 4 9% 14% 7% 1	2020
March	1st to 10th	Night	54% 5% 12% 16% 12% 1	3450
	11th to 20th	Night	58% 5% 13% 15% 8% 2	3480
	21st to end	Night	54% 4 8% 20% 11% 2	3817
April	1st to 10th	Night	58% 4 7% 17% 11% 2	1930
	11th to 20th	Night	51% 3 7% 22% 15% 2	1657
	21st to end	Night	56% 4 8% 14% 16% 3	1620
May	1st to 10th	Night	45% 5% 9% 23% 16% 2	1565
	11th to 20th	Night	43% 5% 10% 22% 17% 3	1416
	21st to end	Night	40% 6% 12% 22% 17% 3	1551
June	1st to 10th	Night	48% 6% 10% 23% 11% 3	1314
	11th to 20th	Night	38% 6% 10% 27% 18% 1	1260
	21st to end	Night	44% 7% 14% 22% 12% 2	1260
July	1st to 10th	Night	32% 6% 13% 30% 16% 3	1225
	11th to 20th	Night	38% 6% 14% 27% 13% 2	1240
	21st to end	Night	39% 8% 15% 27% 11%	1551
August	1st to 10th	Night	39% 7% 17% 25% 11% 1	1600
	11th to 20th	Night	38% 8% 18% 26% 10% 1	1598
	21st to end	Night	43% 7% 14% 24% 11% 1	1813
September	1st to 10th	Night	37% 6% 15% 30% 11% 2	1800
	11th to 20th	Night	41% 6% 14% 29% 10%	1905
	21st to end	Night	46% 4 15% 27% 8%	2011
October	1st to 10th	Night	51% 7% 11% 20% 12%	2160
	11th to 20th	Night	62% 5% 11% 17% 5%	2160
	21st to end	Night	67% 5% 9% 12% 6%	2407
November	1st to 10th	Night	57% 5% 13% 19% 5%	2568
	11th to 20th	Night	63% 5% 12% 14% 5% 1	2660
	21st to end	Night	71% 6% 11% 9% 3	2660
December	1st to 10th	Night	76% 4 8% 9% 3	2660
	11th to 20th	Night	70% 5% 8% 12% 5%	3386
	21st to end	Night	78% 3 6% 10% 3	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	27% 25% 21% 19% 6% 2	180
	11th to 20th	Day	18% 19% 34% 22% 6% 1	202
	21st to end	Day	26% 15% 33% 18% 7% 1	297
February	1st to 10th	Day	26% 28% 33% 10% 1 1	270
	11th to 20th	Day	22% 24% 41% 11% 1	270
	21st to end	Day	32% 27% 30% 10%	225
March	1st to 10th	Day	23% 19% 38% 16% 4	438
	11th to 20th	Day	20% 21% 35% 17% 5% 1	460
	21st to end	Day	28% 20% 29% 17% 4 1	506
April	1st to 10th	Day	26% 19% 30% 18% 6% 1	457
	11th to 20th	Day	31% 17% 22% 18% 8% 4	412
	21st to end	Day	27% 19% 29% 18% 6% 1	420
May	1st to 10th	Day	29% 13% 27% 20% 9% 3	423
	11th to 20th	Day	23% 16% 29% 19% 11% 3	447
	21st to end	Day	18% 15% 32% 22% 12% 2	485
June	1st to 10th	Day	20% 13% 35% 24% 7% 1	571
	11th to 20th	Day	16% 13% 35% 23% 9% 3	630
	21st to end	Day	22% 11% 33% 22% 11% 2	630
July	1st to 10th	Day	13% 9% 29% 36% 11% 2	621
	11th to 20th	Day	16% 11% 27% 28% 14% 4	596
	21st to end	Day	13% 8% 33% 28% 14% 4	488
August	1st to 10th	Day	18% 7% 25% 30% 15% 5%	446
	11th to 20th	Day	18% 4 24% 28% 18% 8%	439
	21st to end	Day	18% 11% 30% 24% 14% 4	495
September	1st to 10th	Day	17% 15% 28% 23% 12% 5%	450
	11th to 20th	Day	18% 8% 29% 27% 14% 5%	450
	21st to end	Day	26% 12% 24% 23% 12% 3	450
October	1st to 10th	Day	22% 17% 26% 23% 9% 3	450
	11th to 20th	Day	27% 19% 35% 14% 4 1	450
	21st to end	Day	38% 18% 28% 13% 2	460
November	1st to 10th	Day	29% 23% 32% 11% 5%	192
	11th to 20th	Day	27% 22% 35% 12% 3	180
	21st to end	Day	31% 22% 34% 11% 1 1	180
December	1st to 10th	Day	29% 17% 34% 16% 3	180
	11th to 20th	Day	31% 21% 32% 12% 3 1	180
	21st to end	Day	31% 23% 30% 13% 3 1	198
January	1st to 10th	Night	26% 15% 33% 20% 5% 1	950
	11th to 20th	Night	27% 16% 29% 22% 5% 1	877
	21st to end	Night	21% 12% 32% 24% 10% 1	836
February	1st to 10th	Night	20% 19% 36% 19% 6%	760
	11th to 20th	Night	21% 16% 35% 21% 6%	743
	21st to end	Night	24% 18% 36% 19% 3	628
March	1st to 10th	Night	20% 19% 34% 22% 5%	760
	11th to 20th	Night	22% 19% 32% 20% 6%	760
	21st to end	Night	20% 14% 33% 25% 6% 1	836
April	1st to 10th	Night	31% 11% 31% 22% 4	760
	11th to 20th	Night	25% 16% 26% 23% 10%	593
	21st to end	Night	26% 11% 26% 27% 9% 1	540
May	1st to 10th	Night	22% 7% 27% 32% 11%	485
	11th to 20th	Night	21% 6% 33% 31% 9%	354
	21st to end	Night	17% 9% 34% 30% 10%	389
June	1st to 10th	Night	14% 8% 34% 32% 13%	360
	11th to 20th	Night	18% 8% 25% 38% 12%	360
	21st to end	Night	17% 6% 28% 34% 14% 1	360
July	1st to 10th	Night	15% 3 28% 40% 12% 1	350
	11th to 20th	Night	14% 5% 26% 36% 18% 1	348
	21st to end	Night	12% 7% 28% 35% 17% 1	462
August	1st to 10th	Night	17% 3 24% 35% 19% 2	537
	11th to 20th	Night	13% 5% 22% 36% 21% 2	534
	21st to end	Night	19% 7% 26% 29% 17% 3	625
September	1st to 10th	Night	19% 5% 28% 29% 17% 2	720
	11th to 20th	Night	20% 7% 27% 25% 18% 3	720
	21st to end	Night	22% 9% 23% 28% 16% 2	720
October	1st to 10th	Night	24% 12% 28% 25% 9% 2	720
	11th to 20th	Night	34% 13% 26% 18% 7% 1	720
	21st to end	Night	35% 15% 28% 18% 4	792
November	1st to 10th	Night	29% 14% 29% 20% 7% 1	740
	11th to 20th	Night	25% 18% 33% 18% 7%	760
	21st to end	Night	34% 14% 29% 18% 4	760
December	1st to 10th	Night	30% 18% 30% 17% 4 1	760
	11th to 20th	Night	27% 18% 33% 17% 3 2	821
	21st to end	Night	32% 16% 28% 21% 4	1045

Page generated at 2024-04-07 09:28:09. Version ac07

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