Le Golf Sélect de Mirabel
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Le Golf Sélect de Mirabel clear sky chart from 2005-11-06 to 2024-04-03.

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% 9% 4 7% 6% 4 5% 5% 5% 6% 32%	78637
	Night	17% 10% 4 7% 6% 3 5% 4 5% 6% 32%	81483
Transparency	Day	51% 7% 11% 19% 11% 1	78342
	Night	52% 6% 11% 19% 10% 1	81312
Seeing	Day	23% 16% 31% 20% 8% 2	13690
	Night	23% 12% 30% 25% 8% 1	22860

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	16% 17% 5% 13% 8% 4 4 4 3 4 22%	2517
	11th to 20th	Day	15% 12% 6% 10% 8% 4 5% 5% 5% 6% 24%	2520
	21st to end	Day	12% 18% 6% 8% 7% 4 6% 6% 5% 5% 23%	2772
February	1st to 10th	Day	14% 14% 5% 10% 7% 4 5% 5% 5% 6% 25%	1691
	11th to 20th	Day	14% 13% 5% 9% 7% 4 5% 5% 5% 6% 26%	1735
	21st to end	Day	18% 14% 5% 8% 7% 3 5% 4 5% 5% 25%	1570
March	1st to 10th	Day	16% 12% 6% 8% 7% 4 5% 4 4 5% 29%	1897
	11th to 20th	Day	15% 11% 5% 8% 7% 4 5% 5% 5% 6% 30%	1996
	21st to end	Day	19% 8% 3 7% 6% 3 5% 4 5% 5% 36%	2484
April	1st to 10th	Day	21% 9% 4 7% 6% 3 4 4 4 5% 33%	2184
	11th to 20th	Day	20% 7% 4 6% 5% 3 5% 4 5% 5% 36%	2134
	21st to end	Day	23% 9% 4 6% 6% 3 4 5% 4 5% 31%	2286
May	1st to 10th	Day	19% 9% 3 6% 6% 3 5% 4 5% 5% 33%	2517
	11th to 20th	Day	18% 7% 3 7% 6% 3 4 4 5% 6% 36%	2478
	21st to end	Day	18% 6% 2 6% 6% 3 5% 5% 6% 7% 36%	2725
June	1st to 10th	Day	21% 7% 3 7% 6% 4 5% 6% 6% 7% 29%	2520
	11th to 20th	Day	15% 7% 3 6% 5% 4 6% 5% 6% 8% 37%	2520
	21st to end	Day	19% 8% 4 6% 7% 4 6% 6% 6% 8% 28%	2520
July	1st to 10th	Day	11% 5% 2 5% 6% 4 7% 6% 5% 8% 40%	2520
	11th to 20th	Day	13% 5% 3 6% 6% 4 6% 6% 7% 9% 35%	2520
	21st to end	Day	12% 5% 3 5% 6% 3 6% 6% 8% 9% 36%	2744
August	1st to 10th	Day	12% 6% 3 7% 6% 4 6% 7% 6% 8% 36%	2506
	11th to 20th	Day	10% 7% 3 5% 5% 4 5% 6% 7% 10% 38%	2282
	21st to end	Day	13% 6% 2 5% 5% 4 5% 4 6% 8% 42%	2376
September	1st to 10th	Day	13% 6% 2 5% 5% 4 5% 5% 7% 8% 40%	2160
	11th to 20th	Day	14% 5% 2 4 4 3 4 4 5% 7% 48%	2103
	21st to end	Day	17% 6% 3 4 5% 3 4 4 6% 7% 41%	1980
October	1st to 10th	Day	22% 7% 3 6% 5% 3 4 5% 5% 6% 36%	1828
	11th to 20th	Day	22% 8% 3 7% 7% 4 4 6% 5% 6% 27%	1780
	21st to end	Day	25% 10% 4 6% 6% 4 5% 4 5% 6% 27%	1782
November	1st to 10th	Day	15% 8% 4 7% 6% 4 6% 5% 6% 7% 33%	1671
	11th to 20th	Day	19% 10% 4 7% 5% 4 6% 5% 6% 7% 27%	1601
	21st to end	Day	22% 11% 3 7% 6% 4 6% 6% 5% 6% 25%	1520
December	1st to 10th	Day	23% 15% 5% 10% 6% 4 4 4 4 6% 19%	1520
	11th to 20th	Day	20% 14% 5% 8% 6% 3 4 4 4 5% 26%	1906
	21st to end	Day	27% 17% 6% 8% 6% 3 4 4 3 4 20%	2772
January	1st to 10th	Night	16% 16% 7% 10% 7% 4 5% 4 5% 5% 22%	4429
	11th to 20th	Night	12% 14% 6% 10% 9% 5% 5% 5% 6% 6% 23%	4440
	21st to end	Night	14% 17% 7% 9% 8% 4 4 4 4 5% 24%	4884
February	1st to 10th	Night	14% 12% 6% 10% 8% 4 6% 5% 6% 6% 25%	2488
	11th to 20th	Night	13% 11% 5% 9% 7% 4 6% 4 6% 6% 29%	2330
	21st to end	Night	15% 14% 5% 8% 6% 3 4 4 5% 6% 31%	1884
March	1st to 10th	Night	16% 12% 5% 8% 7% 3 5% 4 4 6% 30%	2270
	11th to 20th	Night	17% 14% 4 7% 6% 4 4 4 5% 6% 31%	2179
	21st to end	Night	16% 9% 3 7% 5% 3 4 4 4 4 39%	2113
April	1st to 10th	Night	22% 8% 4 7% 5% 3 4 4 4 6% 33%	1821
	11th to 20th	Night	20% 7% 3 6% 5% 3 5% 4 4 6% 37%	1775
	21st to end	Night	21% 10% 3 6% 5% 3 4 4 5% 6% 34%	1674
May	1st to 10th	Night	19% 8% 3 6% 5% 4 5% 4 4 5% 35%	1458
	11th to 20th	Night	18% 7% 4 6% 4 2 4 4 5% 5% 41%	1415
	21st to end	Night	16% 6% 3 5% 4 3 5% 4 4 8% 41%	1550
June	1st to 10th	Night	20% 6% 3 5% 6% 4 4 5% 6% 8% 32%	1440
	11th to 20th	Night	16% 7% 3 5% 5% 3 5% 5% 4 8% 39%	1440
	21st to end	Night	18% 7% 3 5% 5% 3 6% 5% 6% 7% 37%	1440
July	1st to 10th	Night	10% 5% 2 5% 5% 3 5% 6% 6% 8% 45%	1440
	11th to 20th	Night	11% 6% 2 6% 5% 3 5% 5% 6% 11% 39%	1440
	21st to end	Night	12% 5% 3 5% 5% 3 6% 6% 6% 9% 41%	1574
August	1st to 10th	Night	12% 5% 3 5% 6% 2 5% 6% 5% 10% 42%	1432
	11th to 20th	Night	11% 5% 3 6% 5% 3 4 6% 6% 6% 45%	1596
	21st to end	Night	13% 5% 3 5% 4 3 5% 5% 6% 7% 44%	1980
September	1st to 10th	Night	11% 5% 3 6% 5% 4 5% 4 5% 7% 44%	1800
	11th to 20th	Night	15% 6% 2 4 4 2 4 4 5% 7% 48%	1855
	21st to end	Night	17% 5% 2 4 5% 3 4 4 5% 7% 45%	1980
October	1st to 10th	Night	18% 7% 3 5% 5% 3 4 4 5% 6% 39%	2128
	11th to 20th	Night	22% 7% 3 6% 5% 4 5% 3 5% 6% 34%	2178
	21st to end	Night	23% 9% 4 7% 7% 4 4 4 5% 5% 30%	2574
November	1st to 10th	Night	19% 9% 3 7% 5% 2 5% 4 6% 7% 33%	2407
	11th to 20th	Night	17% 10% 4 6% 6% 4 5% 5% 4 5% 33%	2577
	21st to end	Night	21% 13% 4 8% 6% 3 4 4 4 6% 28%	2660
December	1st to 10th	Night	19% 15% 6% 9% 6% 3 6% 5% 5% 5% 21%	2660
	11th to 20th	Night	21% 14% 5% 8% 5% 4 4 4 4 5% 26%	3288
	21st to end	Night	28% 17% 5% 8% 5% 2 3 3 3 4 22%	4884

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	64% 8% 10% 13% 5% 1	2518
	11th to 20th	Day	57% 8% 13% 15% 7% 1	2520
	21st to end	Day	61% 7% 12% 13% 6% 1	2772
February	1st to 10th	Day	60% 5% 8% 18% 7% 2	1691
	11th to 20th	Day	58% 6% 11% 16% 10% 1	1744
	21st to end	Day	61% 4 9% 14% 10% 2	1570
March	1st to 10th	Day	58% 6% 8% 16% 11% 2	1900
	11th to 20th	Day	54% 5% 11% 15% 12% 3	1996
	21st to end	Day	51% 4 8% 17% 16% 4	2484
April	1st to 10th	Day	54% 4 9% 19% 12% 3	2184
	11th to 20th	Day	49% 5% 7% 22% 15% 2	2134
	21st to end	Day	55% 6% 7% 16% 13% 4	2286
May	1st to 10th	Day	51% 6% 7% 19% 15% 3	2517
	11th to 20th	Day	48% 5% 10% 19% 16% 3	2482
	21st to end	Day	47% 7% 11% 19% 14% 2	2725
June	1st to 10th	Day	52% 7% 9% 18% 12% 1	2520
	11th to 20th	Day	44% 7% 12% 21% 14% 3	2520
	21st to end	Day	53% 8% 12% 17% 9% 1	2520
July	1st to 10th	Day	40% 9% 13% 26% 13% 1	2450
	11th to 20th	Day	42% 8% 13% 26% 11%	2445
	21st to end	Day	42% 9% 16% 25% 9%	2591
August	1st to 10th	Day	43% 10% 15% 24% 9%	2492
	11th to 20th	Day	40% 9% 16% 25% 10%	2282
	21st to end	Day	40% 6% 15% 25% 14% 1	2376
September	1st to 10th	Day	39% 8% 13% 27% 14%	2160
	11th to 20th	Day	36% 6% 13% 31% 14% 1	2103
	21st to end	Day	42% 6% 14% 27% 10%	1980
October	1st to 10th	Day	48% 6% 11% 21% 13%	1828
	11th to 20th	Day	57% 7% 12% 17% 7%	1780
	21st to end	Day	58% 5% 12% 17% 7% 1	1782
November	1st to 10th	Day	48% 6% 15% 21% 9% 1	1671
	11th to 20th	Day	55% 6% 12% 16% 10%	1601
	21st to end	Day	59% 8% 14% 13% 5% 1	1520
December	1st to 10th	Day	68% 6% 10% 12% 5%	1520
	11th to 20th	Day	60% 7% 12% 15% 7%	1906
	21st to end	Day	69% 6% 8% 12% 5%	2772
January	1st to 10th	Night	61% 8% 14% 12% 4	4429
	11th to 20th	Night	57% 10% 12% 14% 5% 1	4440
	21st to end	Night	62% 7% 11% 12% 7% 1	4884
February	1st to 10th	Night	58% 5% 11% 18% 8% 1	2488
	11th to 20th	Night	54% 6% 12% 19% 9% 1	2332
	21st to end	Night	55% 5% 10% 16% 13% 1	1884
March	1st to 10th	Night	56% 5% 9% 17% 10% 2	2280
	11th to 20th	Night	54% 5% 10% 16% 12% 3	2180
	21st to end	Night	49% 4 7% 20% 15% 4	2113
April	1st to 10th	Night	53% 5% 8% 18% 14% 2	1821
	11th to 20th	Night	48% 5% 7% 22% 16% 2	1775
	21st to end	Night	51% 6% 8% 18% 14% 4	1674
May	1st to 10th	Night	51% 5% 7% 17% 16% 5%	1458
	11th to 20th	Night	45% 6% 8% 18% 19% 4	1416
	21st to end	Night	43% 6% 11% 20% 17% 3	1551
June	1st to 10th	Night	48% 7% 11% 22% 12% 1	1440
	11th to 20th	Night	44% 6% 10% 23% 15% 3	1440
	21st to end	Night	45% 9% 12% 20% 14%	1440
July	1st to 10th	Night	35% 8% 14% 26% 16% 1	1400
	11th to 20th	Night	38% 7% 13% 29% 12%	1392
	21st to end	Night	38% 9% 15% 25% 12%	1486
August	1st to 10th	Night	38% 9% 17% 26% 11%	1422
	11th to 20th	Night	36% 9% 17% 26% 12% 1	1596
	21st to end	Night	38% 8% 15% 27% 12%	1980
September	1st to 10th	Night	38% 7% 12% 26% 16% 1	1800
	11th to 20th	Night	35% 6% 13% 34% 11% 1	1855
	21st to end	Night	39% 7% 11% 30% 13%	1980
October	1st to 10th	Night	47% 5% 9% 25% 13% 1	2128
	11th to 20th	Night	51% 6% 12% 23% 9%	2178
	21st to end	Night	57% 6% 12% 17% 8% 1	2574
November	1st to 10th	Night	50% 6% 14% 21% 9% 1	2407
	11th to 20th	Night	53% 6% 12% 18% 9% 2	2577
	21st to end	Night	57% 7% 12% 17% 6%	2660
December	1st to 10th	Night	65% 5% 11% 14% 4	2660
	11th to 20th	Night	61% 6% 9% 17% 6% 1	3288
	21st to end	Night	67% 5% 8% 15% 5%	4884

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	21% 22% 35% 18% 4	180
	11th to 20th	Day	27% 21% 36% 12% 5% 1	180
	21st to end	Day	22% 17% 38% 19% 5% 1	198
February	1st to 10th	Day	33% 22% 34% 10% 1	261
	11th to 20th	Day	21% 27% 40% 11% 1	342
	21st to end	Day	29% 23% 29% 16% 3	382
March	1st to 10th	Day	27% 19% 33% 18% 4	460
	11th to 20th	Day	27% 23% 33% 14% 4 1	460
	21st to end	Day	27% 22% 27% 15% 7% 2	506
April	1st to 10th	Day	30% 16% 32% 14% 7% 1	428
	11th to 20th	Day	30% 21% 23% 18% 7% 1	412
	21st to end	Day	30% 17% 30% 15% 5% 2	420
May	1st to 10th	Day	25% 18% 33% 17% 5% 1	423
	11th to 20th	Day	23% 18% 31% 21% 5% 2	447
	21st to end	Day	21% 19% 33% 19% 7% 1	485
June	1st to 10th	Day	24% 18% 33% 17% 8%	450
	11th to 20th	Day	19% 15% 32% 22% 10% 2	450
	21st to end	Day	24% 13% 29% 24% 8% 2	450
July	1st to 10th	Day	13% 10% 36% 26% 12% 4	445
	11th to 20th	Day	16% 8% 35% 30% 9% 2	444
	21st to end	Day	15% 8% 34% 28% 12% 2	488
August	1st to 10th	Day	16% 8% 28% 32% 14% 2	446
	11th to 20th	Day	12% 11% 26% 30% 15% 7%	439
	21st to end	Day	16% 11% 31% 21% 15% 6%	495
September	1st to 10th	Day	16% 8% 35% 24% 12% 6%	450
	11th to 20th	Day	13% 10% 29% 24% 17% 7%	450
	21st to end	Day	20% 13% 27% 23% 13% 4	450
October	1st to 10th	Day	25% 15% 27% 20% 12% 2	450
	11th to 20th	Day	24% 20% 28% 19% 8% 1	439
	21st to end	Day	33% 13% 30% 19% 5%	396
November	1st to 10th	Day	28% 16% 29% 20% 6% 1	365
	11th to 20th	Day	27% 18% 35% 15% 5%	261
	21st to end	Day	29% 20% 32% 16% 3	180
December	1st to 10th	Day	32% 16% 28% 20% 4 1	180
	11th to 20th	Day	30% 25% 30% 12% 2 1	180
	21st to end	Day	35% 19% 27% 14% 4 1	198
January	1st to 10th	Night	26% 14% 34% 22% 4	760
	11th to 20th	Night	27% 17% 31% 19% 5%	760
	21st to end	Night	18% 15% 38% 23% 5%	836
February	1st to 10th	Night	19% 18% 37% 22% 3	760
	11th to 20th	Night	22% 17% 38% 19% 4	743
	21st to end	Night	23% 17% 32% 25% 3	628
March	1st to 10th	Night	23% 15% 35% 23% 3	760
	11th to 20th	Night	25% 18% 32% 20% 5%	760
	21st to end	Night	23% 14% 32% 25% 6%	836
April	1st to 10th	Night	28% 15% 27% 26% 4	729
	11th to 20th	Night	25% 13% 32% 24% 5% 1	711
	21st to end	Night	28% 12% 33% 18% 9%	594
May	1st to 10th	Night	24% 10% 33% 23% 6% 3	378
	11th to 20th	Night	21% 11% 32% 27% 8%	354
	21st to end	Night	17% 10% 38% 27% 8%	389
June	1st to 10th	Night	25% 8% 29% 28% 9% 1	360
	11th to 20th	Night	21% 6% 31% 31% 11% 1	360
	21st to end	Night	20% 5% 30% 30% 14% 1	360
July	1st to 10th	Night	11% 9% 30% 35% 15% 1	350
	11th to 20th	Night	12% 6% 23% 41% 17%	348
	21st to end	Night	14% 4 28% 39% 14% 2	394
August	1st to 10th	Night	15% 3 22% 41% 18% 1	358
	11th to 20th	Night	12% 4 24% 34% 23% 2	532
	21st to end	Night	15% 7% 25% 33% 19% 2	792
September	1st to 10th	Night	14% 5% 29% 36% 15% 1	720
	11th to 20th	Night	18% 7% 21% 32% 21% 2	720
	21st to end	Night	20% 7% 27% 27% 17% 3	720
October	1st to 10th	Night	23% 10% 27% 29% 11%	720
	11th to 20th	Night	26% 12% 28% 26% 8% 1	720
	21st to end	Night	29% 13% 30% 24% 5%	792
November	1st to 10th	Night	25% 14% 28% 24% 8% 1	740
	11th to 20th	Night	24% 16% 33% 19% 8%	760
	21st to end	Night	32% 14% 29% 18% 6%	760
December	1st to 10th	Night	28% 16% 32% 20% 5%	760
	11th to 20th	Night	29% 18% 30% 18% 4 1	760
	21st to end	Night	36% 15% 28% 17% 5%	836

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