Miquelon Lake Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Miquelon Lake Provincial Park clear sky chart from 2005-11-06 to 2025-09-19.

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	9% 9% 3 9% 5% 5% 5% 4 6% 8% 36%	130774
	Night	7% 9% 4 10% 6% 6% 6% 4 6% 8% 34%	126972
Transparency	Day	43% 8% 17% 23% 8% 1	130471
	Night	45% 8% 16% 21% 9% 1	126854
Seeing	Day	12% 7% 25% 31% 19% 6%	16652
	Night	12% 6% 29% 36% 16% 2	25551

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	5% 11% 5% 12% 8% 6% 5% 4 7% 10% 28%	3179
	11th to 20th	Day	3 9% 3 10% 8% 7% 7% 5% 9% 10% 30%	3159
	21st to end	Day	7% 11% 3 9% 5% 5% 5% 4 5% 9% 36%	3728
February	1st to 10th	Day	8% 12% 5% 12% 8% 6% 5% 4 6% 8% 25%	1600
	11th to 20th	Day	5% 11% 6% 12% 8% 7% 6% 6% 6% 7% 27%	1730
	21st to end	Day	3 12% 5% 12% 7% 5% 7% 6% 7% 8% 27%	1517
March	1st to 10th	Day	3 9% 4 12% 7% 5% 6% 5% 7% 10% 31%	4518
	11th to 20th	Day	6% 12% 5% 11% 5% 6% 5% 3 5% 9% 34%	4999
	21st to end	Day	9% 14% 6% 15% 6% 5% 4 4 5% 7% 25%	5499
April	1st to 10th	Day	8% 11% 4 8% 7% 7% 5% 5% 7% 8% 32%	2519
	11th to 20th	Day	12% 11% 4 9% 4 5% 5% 4 6% 8% 31%	2570
	21st to end	Day	13% 9% 4 9% 6% 5% 5% 4 7% 8% 32%	2600
May	1st to 10th	Day	11% 9% 3 8% 5% 5% 5% 4 5% 6% 38%	6586
	11th to 20th	Day	14% 12% 4 9% 6% 6% 5% 4 6% 8% 27%	6734
	21st to end	Day	10% 7% 3 7% 5% 5% 5% 4 6% 8% 40%	7405
June	1st to 10th	Day	14% 8% 3 8% 6% 5% 6% 4 6% 7% 32%	3000
	11th to 20th	Day	18% 10% 4 8% 7% 6% 6% 4 6% 8% 24%	3000
	21st to end	Day	11% 6% 3 7% 5% 5% 6% 5% 7% 9% 36%	3000
July	1st to 10th	Day	7% 4 2 6% 4 4 5% 4 7% 9% 48%	6780
	11th to 20th	Day	10% 6% 2 6% 4 5% 5% 5% 6% 9% 41%	6780
	21st to end	Day	10% 6% 2 7% 5% 5% 5% 4 6% 8% 43%	7376
August	1st to 10th	Day	11% 6% 2 6% 5% 5% 5% 4 7% 8% 40%	4687
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 4 7% 10% 43%	4231
	21st to end	Day	10% 5% 2 5% 4 4 5% 5% 7% 9% 45%	4664
September	1st to 10th	Day	10% 5% 2 8% 4 3 5% 4 5% 8% 45%	2545
	11th to 20th	Day	13% 7% 3 6% 3 4 4 3 6% 8% 43%	2179
	21st to end	Day	8% 6% 2 7% 4 4 5% 4 6% 8% 44%	2090
October	1st to 10th	Day	8% 8% 4 8% 5% 6% 5% 3 6% 8% 40%	3266
	11th to 20th	Day	9% 9% 3 8% 4 4 5% 4 6% 9% 37%	2937
	21st to end	Day	7% 11% 4 8% 5% 6% 5% 4 6% 8% 39%	3023
November	1st to 10th	Day	8% 15% 5% 10% 7% 6% 5% 4 6% 9% 26%	1568
	11th to 20th	Day	5% 11% 5% 15% 8% 6% 5% 4 5% 7% 30%	1475
	21st to end	Day	5% 11% 6% 12% 8% 6% 5% 4 5% 8% 31%	1400
December	1st to 10th	Day	8% 14% 6% 11% 7% 5% 7% 5% 7% 8% 22%	2290
	11th to 20th	Day	8% 13% 4 13% 7% 6% 7% 4 8% 9% 20%	2642
	21st to end	Day	3 7% 3 8% 7% 6% 6% 3 6% 7% 44%	3498
January	1st to 10th	Night	4 8% 5% 13% 10% 8% 7% 6% 7% 7% 26%	6766
	11th to 20th	Night	2 8% 4 11% 8% 7% 6% 5% 6% 6% 37%	6739
	21st to end	Night	7% 11% 4 11% 6% 5% 4 4 6% 8% 35%	7260
February	1st to 10th	Night	5% 10% 5% 13% 9% 8% 7% 5% 6% 6% 27%	2800
	11th to 20th	Night	5% 11% 4 10% 6% 6% 6% 5% 7% 7% 31%	2557
	21st to end	Night	3 10% 4 10% 8% 6% 6% 5% 8% 8% 31%	2110
March	1st to 10th	Night	4 9% 5% 12% 6% 5% 5% 5% 8% 11% 31%	5376
	11th to 20th	Night	4 10% 4 11% 9% 6% 6% 4 6% 9% 31%	5000
	21st to end	Night	10% 13% 6% 14% 7% 6% 5% 4 6% 6% 23%	5473
April	1st to 10th	Night	6% 10% 2 9% 7% 7% 5% 5% 7% 7% 35%	1881
	11th to 20th	Night	10% 11% 5% 10% 5% 6% 7% 5% 7% 7% 27%	1781
	21st to end	Night	12% 10% 3 8% 5% 5% 5% 5% 5% 8% 35%	1800
May	1st to 10th	Night	16% 7% 3 7% 4 4 4 4 5% 6% 40%	3378
	11th to 20th	Night	12% 10% 4 10% 6% 7% 7% 5% 6% 7% 25%	3159
	21st to end	Night	12% 7% 3 8% 5% 6% 5% 4 6% 8% 34%	3470
June	1st to 10th	Night	13% 9% 4 8% 6% 5% 5% 4 6% 7% 32%	1400
	11th to 20th	Night	15% 9% 4 9% 6% 7% 7% 5% 8% 7% 23%	1400
	21st to end	Night	8% 6% 2 8% 6% 5% 6% 6% 8% 9% 37%	1400
July	1st to 10th	Night	6% 5% 2 7% 5% 5% 6% 4 7% 9% 44%	3180
	11th to 20th	Night	11% 6% 3 6% 5% 5% 5% 5% 7% 10% 38%	3180
	21st to end	Night	9% 6% 2 6% 5% 4 4 4 7% 10% 42%	3467
August	1st to 10th	Night	15% 6% 2 6% 4 4 5% 4 6% 7% 41%	2460
	11th to 20th	Night	9% 7% 2 7% 5% 4 5% 4 7% 9% 40%	2824
	21st to end	Night	9% 5% 2 6% 5% 5% 5% 4 7% 8% 44%	3245
September	1st to 10th	Night	11% 4 2 6% 4 3 5% 4 6% 7% 47%	1853
	11th to 20th	Night	12% 8% 2 5% 4 3 4 3 5% 7% 47%	2178
	21st to end	Night	8% 6% 3 7% 5% 4 5% 4 6% 8% 45%	2090
October	1st to 10th	Night	8% 7% 2 8% 5% 5% 4 4 6% 9% 41%	3706
	11th to 20th	Night	9% 7% 3 7% 4 4 5% 4 6% 9% 41%	3988
	21st to end	Night	5% 9% 3 8% 6% 6% 5% 5% 7% 9% 37%	4503
November	1st to 10th	Night	11% 16% 5% 10% 6% 4 5% 3 5% 6% 28%	2730
	11th to 20th	Night	6% 13% 5% 12% 8% 6% 6% 4 6% 7% 27%	2920
	21st to end	Night	5% 11% 5% 13% 8% 6% 5% 4 6% 8% 28%	3000
December	1st to 10th	Night	9% 16% 5% 13% 8% 6% 5% 5% 6% 6% 22%	4890
	11th to 20th	Night	6% 14% 6% 14% 8% 6% 6% 5% 7% 8% 20%	5550
	21st to end	Night	2 6% 3 9% 6% 6% 6% 4 6% 8% 43%	7458

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	51% 7% 12% 21% 9% 1	3179
	11th to 20th	Day	45% 7% 13% 14% 20% 2	3180
	21st to end	Day	44% 7% 20% 24% 6%	3728
February	1st to 10th	Day	55% 6% 14% 15% 9% 1	1600
	11th to 20th	Day	53% 8% 14% 16% 9%	1739
	21st to end	Day	50% 8% 13% 21% 8% 1	1517
March	1st to 10th	Day	45% 7% 19% 19% 9%	4518
	11th to 20th	Day	47% 7% 15% 21% 10%	5000
	21st to end	Day	56% 7% 10% 20% 6%	5499
April	1st to 10th	Day	47% 9% 17% 18% 8% 1	2519
	11th to 20th	Day	48% 7% 15% 20% 9%	2570
	21st to end	Day	46% 9% 15% 21% 7% 2	2600
May	1st to 10th	Day	43% 7% 11% 23% 14% 1	6586
	11th to 20th	Day	50% 9% 13% 21% 6%	6738
	21st to end	Day	38% 9% 20% 20% 11% 1	7406
June	1st to 10th	Day	48% 8% 13% 21% 10% 1	3000
	11th to 20th	Day	56% 9% 15% 15% 4	3000
	21st to end	Day	40% 11% 22% 20% 6% 1	3000
July	1st to 10th	Day	30% 9% 21% 28% 11% 1	6706
	11th to 20th	Day	37% 9% 17% 27% 10%	6699
	21st to end	Day	37% 8% 21% 26% 8%	7169
August	1st to 10th	Day	38% 10% 18% 31% 2	4669
	11th to 20th	Day	32% 10% 24% 27% 6%	4271
	21st to end	Day	33% 9% 26% 26% 5% 1	4663
September	1st to 10th	Day	36% 10% 18% 27% 8% 2	2545
	11th to 20th	Day	38% 8% 19% 28% 7% 1	2179
	21st to end	Day	36% 10% 18% 26% 8% 2	2090
October	1st to 10th	Day	42% 6% 22% 24% 5%	3266
	11th to 20th	Day	42% 7% 16% 25% 10%	2937
	21st to end	Day	43% 7% 18% 28% 4	3023
November	1st to 10th	Day	54% 8% 16% 14% 6% 1	1568
	11th to 20th	Day	54% 6% 15% 19% 5%	1475
	21st to end	Day	52% 8% 17% 18% 5% 1	1400
December	1st to 10th	Day	57% 9% 18% 11% 4 1	2290
	11th to 20th	Day	57% 8% 17% 15% 4	2644
	21st to end	Day	38% 6% 13% 28% 14% 2	3498
January	1st to 10th	Night	53% 8% 14% 14% 9% 1	6766
	11th to 20th	Night	45% 7% 14% 16% 17% 1	6780
	21st to end	Night	47% 6% 18% 23% 6%	7260
February	1st to 10th	Night	54% 6% 13% 17% 9% 1	2800
	11th to 20th	Night	47% 9% 14% 17% 11% 1	2558
	21st to end	Night	46% 8% 12% 22% 10% 1	2110
March	1st to 10th	Night	43% 8% 18% 22% 9%	5376
	11th to 20th	Night	46% 8% 17% 19% 9% 1	5000
	21st to end	Night	55% 10% 11% 16% 8%	5473
April	1st to 10th	Night	44% 8% 14% 20% 13% 1	1881
	11th to 20th	Night	51% 8% 12% 18% 8% 2	1781
	21st to end	Night	45% 8% 13% 21% 12% 1	1800
May	1st to 10th	Night	43% 6% 9% 23% 16% 3	3377
	11th to 20th	Night	50% 12% 14% 17% 6%	3159
	21st to end	Night	44% 10% 16% 21% 9% 1	3470
June	1st to 10th	Night	49% 8% 14% 19% 9% 1	1400
	11th to 20th	Night	54% 12% 16% 12% 5%	1400
	21st to end	Night	39% 11% 23% 22% 5% 1	1400
July	1st to 10th	Night	34% 9% 22% 22% 13% 1	3145
	11th to 20th	Night	39% 9% 15% 28% 8% 1	3138
	21st to end	Night	34% 10% 23% 26% 8%	3369
August	1st to 10th	Night	39% 10% 19% 29% 2	2453
	11th to 20th	Night	37% 10% 21% 24% 8%	2850
	21st to end	Night	34% 8% 22% 29% 6%	3245
September	1st to 10th	Night	32% 10% 18% 26% 12% 2	1853
	11th to 20th	Night	35% 7% 17% 29% 10% 2	2178
	21st to end	Night	35% 9% 15% 25% 13% 3	2090
October	1st to 10th	Night	37% 7% 21% 27% 7%	3706
	11th to 20th	Night	38% 7% 14% 33% 7%	3988
	21st to end	Night	41% 8% 21% 24% 6%	4503
November	1st to 10th	Night	54% 7% 12% 19% 7%	2730
	11th to 20th	Night	54% 9% 13% 17% 7% 1	2920
	21st to end	Night	53% 8% 15% 18% 5% 1	3000
December	1st to 10th	Night	60% 8% 15% 11% 5% 1	4890
	11th to 20th	Night	58% 9% 18% 10% 5%	5547
	21st to end	Night	36% 7% 15% 22% 17% 2	7458

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	12% 5% 31% 30% 20% 5%	200
	11th to 20th	Day	11% 6% 34% 32% 16% 3	200
	21st to end	Day	10% 11% 29% 33% 13% 5%	220
February	1st to 10th	Day	12% 10% 29% 35% 13% 3	200
	11th to 20th	Day	9% 6% 29% 36% 17% 3	287
	21st to end	Day	5% 7% 31% 34% 16% 7%	281
March	1st to 10th	Day	9% 8% 26% 35% 18% 4	500
	11th to 20th	Day	10% 6% 28% 32% 19% 6%	500
	21st to end	Day	14% 5% 24% 35% 18% 4	550
April	1st to 10th	Day	8% 11% 27% 37% 14% 4	500
	11th to 20th	Day	15% 9% 22% 28% 20% 6%	492
	21st to end	Day	17% 9% 22% 33% 14% 6%	500
May	1st to 10th	Day	12% 9% 24% 33% 16% 6%	677
	11th to 20th	Day	11% 7% 23% 33% 18% 7%	725
	21st to end	Day	15% 5% 22% 31% 18% 8%	789
June	1st to 10th	Day	16% 10% 23% 32% 15% 4	730
	11th to 20th	Day	18% 7% 24% 26% 18% 8%	730
	21st to end	Day	11% 5% 21% 30% 23% 10%	730
July	1st to 10th	Day	10% 5% 17% 34% 25% 10%	721
	11th to 20th	Day	11% 5% 19% 30% 26% 9%	718
	21st to end	Day	10% 5% 17% 32% 26% 10%	794
August	1st to 10th	Day	11% 4 21% 29% 23% 11%	621
	11th to 20th	Day	9% 5% 25% 31% 24% 7%	517
	21st to end	Day	11% 5% 20% 31% 22% 10%	583
September	1st to 10th	Day	10% 9% 27% 26% 21% 7%	530
	11th to 20th	Day	16% 5% 26% 31% 19% 4	523
	21st to end	Day	12% 13% 31% 26% 15% 3	490
October	1st to 10th	Day	18% 6% 31% 25% 15% 5%	357
	11th to 20th	Day	14% 9% 30% 31% 14% 2	300
	21st to end	Day	12% 13% 34% 27% 11% 3	330
November	1st to 10th	Day	13% 9% 31% 32% 13% 2	300
	11th to 20th	Day	10% 8% 37% 34% 10% 1	237
	21st to end	Day	5% 7% 35% 38% 12% 5%	200
December	1st to 10th	Day	9% 9% 32% 31% 14% 6%	200
	11th to 20th	Day	8% 11% 28% 36% 16% 2	200
	21st to end	Day	8% 5% 22% 40% 22% 4	220
January	1st to 10th	Night	9% 8% 33% 35% 14% 2	1000
	11th to 20th	Night	9% 10% 34% 36% 11% 1	1000
	21st to end	Night	12% 11% 34% 31% 11% 2	1019
February	1st to 10th	Night	9% 8% 27% 37% 18% 2	800
	11th to 20th	Night	9% 6% 32% 37% 16% 1	784
	21st to end	Night	7% 5% 28% 35% 20% 4	660
March	1st to 10th	Night	9% 6% 27% 41% 16% 3	800
	11th to 20th	Night	10% 4 31% 38% 14% 3	800
	21st to end	Night	13% 4 28% 37% 16% 2	880
April	1st to 10th	Night	9% 7% 28% 35% 19% 2	681
	11th to 20th	Night	13% 7% 31% 34% 15% 1	593
	21st to end	Night	15% 8% 24% 36% 16% 2	600
May	1st to 10th	Night	16% 7% 23% 35% 16% 2	469
	11th to 20th	Night	12% 5% 24% 38% 20% 2	394
	21st to end	Night	18% 5% 24% 31% 19% 2	433
June	1st to 10th	Night	17% 9% 25% 34% 13% 3	400
	11th to 20th	Night	20% 7% 22% 32% 18% 2	400
	21st to end	Night	10% 5% 22% 34% 26% 4	400
July	1st to 10th	Night	13% 3 17% 41% 24% 2	390
	11th to 20th	Night	11% 4 20% 44% 21% 1	388
	21st to end	Night	9% 5% 17% 41% 25% 3	438
August	1st to 10th	Night	11% 3 20% 32% 29% 4	398
	11th to 20th	Night	12% 5% 18% 38% 26% 2	541
	21st to end	Night	11% 3 21% 38% 25% 1	660
September	1st to 10th	Night	13% 3 20% 40% 23% 2	618
	11th to 20th	Night	15% 4 20% 40% 19% 2	792
	21st to end	Night	11% 4 30% 39% 14% 2	760
October	1st to 10th	Night	15% 3 28% 39% 14% 1	760
	11th to 20th	Night	13% 5% 32% 35% 13% 1	760
	21st to end	Night	12% 7% 36% 33% 12%	858
November	1st to 10th	Night	18% 7% 33% 32% 9% 1	975
	11th to 20th	Night	11% 9% 35% 31% 11% 3	1000
	21st to end	Night	10% 6% 39% 34% 10% 2	1000
December	1st to 10th	Night	12% 9% 34% 30% 13% 3	1000
	11th to 20th	Night	10% 7% 34% 36% 12% 2	1000
	21st to end	Night	9% 4 31% 38% 15% 3	1100

Page generated at 2025-09-15 23:49:16. Version ac07

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