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 2024-11-04.

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	16% 12% 4 8% 5% 4 4 3 5% 6% 32%	101692
	Night	16% 14% 4 10% 5% 4 4 3 5% 6% 29%	97333
Transparency	Day	53% 5% 12% 21% 9% 1	105256
	Night	56% 5% 11% 19% 9% 1	101858
Seeing	Day	23% 15% 30% 21% 9% 2	15097
	Night	24% 13% 30% 24% 9% 1	24096

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% 25% 11% 12% 5% 4 3 2 4 3 16%	2208
	11th to 20th	Day	10% 14% 8% 20% 8% 5% 4 4 5% 5% 16%	2388
	21st to end	Day	16% 22% 9% 14% 6% 4 3 3 3 4 17%	3124
February	1st to 10th	Day	11% 20% 7% 14% 8% 5% 4 4 4 5% 20%	1710
	11th to 20th	Day	12% 17% 7% 12% 7% 5% 5% 3 4 6% 23%	1663
	21st to end	Day	16% 17% 5% 12% 7% 5% 4 3 4 3 23%	1432
March	1st to 10th	Day	17% 16% 5% 8% 5% 4 5% 3 5% 5% 26%	3399
	11th to 20th	Day	9% 18% 7% 14% 6% 4 4 3 4 5% 25%	3480
	21st to end	Day	12% 14% 6% 10% 5% 5% 3 3 4 5% 33%	3815
April	1st to 10th	Day	21% 14% 4 7% 4 4 4 3 5% 6% 28%	2249
	11th to 20th	Day	21% 12% 3 6% 3 3 4 4 5% 6% 34%	2394
	21st to end	Day	22% 12% 3 7% 4 4 3 3 4 5% 35%	2470
May	1st to 10th	Day	20% 9% 3 7% 4 4 3 3 5% 7% 34%	4204
	11th to 20th	Day	14% 7% 3 7% 5% 4 4 4 6% 8% 37%	4398
	21st to end	Day	18% 7% 2 6% 4 4 3 3 5% 7% 42%	4837
June	1st to 10th	Day	19% 9% 3 7% 4 5% 5% 4 6% 7% 33%	2788
	11th to 20th	Day	14% 6% 3 6% 5% 5% 5% 4 6% 8% 39%	2850
	21st to end	Day	19% 8% 3 6% 5% 5% 4 4 5% 7% 34%	2850
July	1st to 10th	Day	17% 7% 2 7% 5% 5% 4 4 5% 8% 36%	4760
	11th to 20th	Day	14% 6% 2 6% 5% 4 5% 4 6% 9% 39%	4710
	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	18% 18% 4 8% 4 4 4 3 5% 7% 25%	1534
	11th to 20th	Day	18% 19% 6% 11% 7% 4 4 3 4 5% 20%	1520
	21st to end	Day	24% 20% 6% 12% 6% 5% 3 3 3 4 13%	1520
December	1st to 10th	Day	17% 24% 7% 11% 7% 6% 4 4 3 4 13%	1520
	11th to 20th	Day	18% 20% 6% 11% 5% 5% 4 3 4 4 20%	1806
	21st to end	Day	20% 24% 8% 16% 4 3 3 2 3 3 13%	2431
January	1st to 10th	Night	15% 21% 9% 14% 7% 5% 5% 3 4 4 14%	4748
	11th to 20th	Night	12% 15% 6% 17% 8% 5% 5% 3 4 6% 17%	4558
	21st to end	Night	13% 23% 9% 14% 6% 5% 3 2 3 3 16%	4532
February	1st to 10th	Night	12% 18% 6% 13% 8% 6% 4 4 4 4 22%	2470
	11th to 20th	Night	12% 17% 6% 12% 7% 5% 4 3 5% 5% 24%	2403
	21st to end	Night	13% 18% 6% 11% 7% 6% 5% 3 5% 5% 22%	2020
March	1st to 10th	Night	14% 14% 4 9% 5% 4 5% 3 5% 7% 30%	3440
	11th to 20th	Night	12% 20% 5% 9% 5% 4 4 3 4 5% 28%	3479
	21st to end	Night	12% 13% 4 10% 7% 5% 4 2 4 5% 33%	3817
April	1st to 10th	Night	20% 15% 4 7% 5% 3 4 3 5% 5% 29%	1930
	11th to 20th	Night	20% 11% 3 7% 4 4 4 2 4 5% 37%	1750
	21st to end	Night	21% 11% 4 7% 4 5% 4 4 5% 5% 31%	1710
May	1st to 10th	Night	15% 9% 2 6% 4 5% 4 4 5% 8% 37%	2722
	11th to 20th	Night	12% 7% 3 7% 5% 4 5% 3 6% 8% 40%	2495
	21st to end	Night	13% 8% 3 7% 5% 4 3 3 5% 8% 40%	2738
June	1st to 10th	Night	13% 8% 4 8% 6% 5% 4 5% 5% 6% 35%	1387
	11th to 20th	Night	15% 5% 1 5% 3 4 4 3 6% 9% 43%	1330
	21st to end	Night	15% 8% 2 7% 4 4 4 4 8% 7% 37%	1330
July	1st to 10th	Night	14% 7% 2 7% 4 4 3 3 5% 7% 44%	2210
	11th to 20th	Night	16% 7% 3 5% 4 3 4 3 6% 6% 43%	2258
	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 8% 5% 4 4 3 4 5% 29%	2616
	11th to 20th	Night	17% 17% 5% 11% 6% 5% 4 3 5% 5% 22%	2660
	21st to end	Night	22% 19% 6% 10% 8% 4 4 3 3 5% 16%	2660
December	1st to 10th	Night	18% 24% 7% 12% 6% 4 4 3 4 4 13%	2660
	11th to 20th	Night	16% 21% 6% 13% 6% 5% 4 3 4 4 18%	3386
	21st to end	Night	20% 22% 6% 17% 6% 4 3 2 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	58% 3 10% 16% 10% 1	2249
	11th to 20th	Day	52% 4 8% 22% 12% 1	2394
	21st to end	Day	54% 4 7% 17% 14% 3	2470
May	1st to 10th	Day	49% 5% 13% 21% 11% 1	4216
	11th to 20th	Day	42% 7% 13% 28% 9% 1	4402
	21st to end	Day	43% 5% 14% 19% 18% 2	4837
June	1st to 10th	Day	50% 6% 10% 22% 12% 1	2788
	11th to 20th	Day	43% 7% 10% 25% 14% 1	2850
	21st to end	Day	50% 6% 12% 19% 12% 1	2850
July	1st to 10th	Day	47% 6% 14% 23% 10% 1	4686
	11th to 20th	Day	41% 6% 16% 30% 7%	4629
	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	59% 6% 13% 17% 5%	1534
	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 8% 17% 11% 2	1930
	11th to 20th	Night	51% 3 7% 22% 15% 2	1750
	21st to end	Night	56% 4 7% 14% 16% 3	1710
May	1st to 10th	Night	43% 6% 11% 25% 13% 1	2729
	11th to 20th	Night	40% 6% 13% 25% 15% 2	2496
	21st to end	Night	42% 6% 11% 23% 15% 3	2739
June	1st to 10th	Night	48% 6% 10% 23% 11% 3	1387
	11th to 20th	Night	38% 6% 10% 27% 18% 1	1330
	21st to end	Night	45% 6% 13% 22% 12% 1	1330
July	1st to 10th	Night	40% 5% 13% 27% 13% 2	2175
	11th to 20th	Night	41% 6% 15% 29% 8% 1	2216
	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%	2616
	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% 31% 17% 6% 1	460
	11th to 20th	Day	34% 17% 21% 16% 8% 3	452
	21st to end	Day	28% 20% 28% 17% 5% 2	460
May	1st to 10th	Day	28% 13% 29% 19% 9% 3	463
	11th to 20th	Day	21% 16% 28% 20% 12% 3	487
	21st to end	Day	18% 15% 32% 23% 11% 2	529
June	1st to 10th	Day	20% 13% 34% 24% 7% 1	618
	11th to 20th	Day	16% 13% 37% 22% 9% 2	680
	21st to end	Day	23% 11% 33% 21% 11% 2	680
July	1st to 10th	Day	14% 9% 29% 34% 11% 2	671
	11th to 20th	Day	16% 11% 28% 28% 13% 3	644
	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	28% 24% 33% 11% 5%	199
	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% 32% 21% 4	760
	11th to 20th	Night	26% 16% 26% 22% 9%	626
	21st to end	Night	26% 12% 26% 27% 9% 1	570
May	1st to 10th	Night	22% 7% 28% 32% 11%	511
	11th to 20th	Night	20% 7% 32% 32% 9%	374
	21st to end	Night	17% 10% 33% 31% 9%	411
June	1st to 10th	Night	15% 8% 33% 32% 12%	380
	11th to 20th	Night	17% 9% 25% 37% 11%	380
	21st to end	Night	17% 7% 28% 33% 13% 1	380
July	1st to 10th	Night	15% 4 29% 40% 12% 1	370
	11th to 20th	Night	14% 5% 26% 36% 17% 1	368
	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	29% 14% 29% 21% 7% 1	755
	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 2024-11-01 22:47:52. Version ac07

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