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 2024-11-04.

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	17% 9% 3 8% 5% 5% 5% 4 5% 7% 32%	101552
	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 33%	97479
Transparency	Day	49% 7% 13% 20% 10% 1	105002
	Night	50% 7% 12% 20% 10% 1	102118
Seeing	Day	23% 16% 31% 20% 8% 2	14534
	Night	23% 12% 30% 25% 9% 1	23503

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% 18% 5% 15% 6% 5% 4 3 3 4 22%	2517
	11th to 20th	Day	15% 12% 6% 11% 7% 5% 4 4 5% 6% 24%	2520
	21st to end	Day	12% 19% 6% 10% 6% 5% 6% 4 6% 5% 22%	2772
February	1st to 10th	Day	14% 15% 5% 11% 6% 5% 5% 4 5% 5% 25%	1691
	11th to 20th	Day	14% 14% 4 10% 7% 5% 4 4 6% 6% 26%	1735
	21st to end	Day	18% 15% 5% 9% 6% 4 5% 3 5% 5% 25%	1570
March	1st to 10th	Day	20% 13% 4 9% 6% 5% 4 3 4 5% 26%	3116
	11th to 20th	Day	12% 18% 5% 10% 6% 5% 4 4 4 5% 26%	3334
	21st to end	Day	15% 7% 3 8% 6% 5% 5% 3 5% 5% 39%	4129
April	1st to 10th	Day	21% 11% 3 8% 5% 4 4 3 4 5% 32%	2280
	11th to 20th	Day	21% 8% 3 7% 4 4 4 3 5% 5% 35%	2254
	21st to end	Day	23% 9% 3 7% 5% 4 4 4 4 5% 32%	2413
May	1st to 10th	Day	20% 9% 3 8% 5% 5% 5% 4 6% 6% 28%	4423
	11th to 20th	Day	18% 8% 3 8% 6% 5% 5% 4 6% 6% 32%	4398
	21st to end	Day	17% 6% 2 7% 5% 5% 5% 4 6% 8% 36%	4837
June	1st to 10th	Day	20% 8% 3 8% 5% 5% 5% 4 6% 7% 29%	2660
	11th to 20th	Day	14% 7% 3 7% 5% 6% 5% 4 6% 8% 36%	2660
	21st to end	Day	19% 9% 3 7% 6% 5% 5% 4 6% 7% 28%	2660
July	1st to 10th	Day	12% 7% 2 7% 6% 6% 6% 5% 6% 9% 35%	4440
	11th to 20th	Day	14% 5% 3 6% 5% 5% 6% 5% 7% 8% 36%	4440
	21st to end	Day	11% 5% 2 5% 4 4 4 4 7% 8% 45%	4814
August	1st to 10th	Day	14% 6% 2 8% 5% 5% 6% 5% 6% 9% 33%	4423
	11th to 20th	Day	14% 7% 3 6% 5% 4 5% 4 6% 8% 37%	3992
	21st to end	Day	16% 5% 2 6% 5% 5% 5% 4 6% 9% 39%	4180
September	1st to 10th	Day	13% 6% 2 6% 4 5% 5% 4 7% 8% 41%	2280
	11th to 20th	Day	13% 5% 2 5% 4 4 4 3 5% 7% 49%	2219
	21st to end	Day	17% 6% 2 5% 4 4 3 3 6% 7% 41%	2090
October	1st to 10th	Day	21% 7% 3 7% 4 3 3 4 5% 6% 36%	1929
	11th to 20th	Day	21% 8% 3 8% 6% 5% 5% 4 5% 6% 29%	1878
	21st to end	Day	23% 10% 3 7% 4 5% 4 4 5% 6% 28%	1881
November	1st to 10th	Day	15% 9% 3 8% 5% 5% 5% 4 6% 7% 33%	1698
	11th to 20th	Day	19% 11% 3 8% 4 6% 6% 4 6% 7% 27%	1601
	21st to end	Day	22% 12% 2 7% 5% 5% 5% 4 5% 6% 24%	1520
December	1st to 10th	Day	23% 16% 4 10% 6% 5% 3 4 4 5% 19%	1520
	11th to 20th	Day	20% 14% 4 9% 5% 5% 3 4 5% 4 26%	1906
	21st to end	Day	26% 17% 5% 9% 5% 4 3 3 3 4 20%	2772
January	1st to 10th	Night	16% 17% 6% 11% 6% 5% 4 3 5% 5% 22%	4429
	11th to 20th	Night	12% 14% 5% 12% 7% 6% 5% 4 6% 6% 23%	4440
	21st to end	Night	14% 17% 7% 11% 6% 5% 4 3 4 5% 24%	4884
February	1st to 10th	Night	14% 13% 5% 11% 6% 5% 5% 4 6% 6% 25%	2488
	11th to 20th	Night	13% 11% 5% 10% 6% 5% 4 4 6% 6% 29%	2330
	21st to end	Night	14% 16% 4 9% 5% 4 4 3 5% 5% 31%	1884
March	1st to 10th	Night	20% 12% 4 7% 5% 4 4 3 4 5% 32%	3724
	11th to 20th	Night	16% 19% 4 9% 5% 4 3 2 4 5% 27%	3621
	21st to end	Night	13% 10% 4 9% 5% 5% 4 3 4 4 39%	3502
April	1st to 10th	Night	22% 9% 3 7% 4 4 4 3 4 6% 33%	1900
	11th to 20th	Night	20% 8% 3 7% 4 4 5% 2 4 6% 36%	1875
	21st to end	Night	21% 10% 2 6% 4 4 4 4 5% 5% 35%	1767
May	1st to 10th	Night	20% 9% 3 8% 5% 5% 5% 3 5% 6% 32%	2546
	11th to 20th	Night	21% 7% 3 6% 4 3 4 4 4 6% 39%	2495
	21st to end	Night	17% 7% 3 7% 4 4 5% 3 5% 8% 36%	2738
June	1st to 10th	Night	19% 7% 2 6% 5% 5% 5% 4 6% 8% 32%	1520
	11th to 20th	Night	16% 8% 3 6% 4 4 5% 4 5% 7% 40%	1520
	21st to end	Night	19% 7% 2 6% 5% 4 6% 4 6% 6% 36%	1520
July	1st to 10th	Night	14% 7% 3 8% 5% 5% 6% 5% 6% 7% 36%	2520
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 5% 9% 41%	2520
	21st to end	Night	12% 6% 2 6% 4 4 5% 4 6% 8% 44%	2739
August	1st to 10th	Night	15% 7% 3 7% 5% 4 5% 4 5% 8% 38%	2506
	11th to 20th	Night	16% 7% 3 6% 4 4 5% 4 6% 6% 40%	2800
	21st to end	Night	17% 5% 3 7% 4 4 4 4 5% 6% 42%	3476
September	1st to 10th	Night	11% 5% 3 7% 4 4 5% 3 6% 7% 45%	1900
	11th to 20th	Night	14% 6% 2 5% 3 3 4 3 4 7% 50%	1959
	21st to end	Night	17% 6% 2 5% 4 4 3 3 5% 7% 45%	2090
October	1st to 10th	Night	18% 8% 3 6% 4 4 5% 3 5% 6% 39%	2247
	11th to 20th	Night	21% 8% 2 6% 4 5% 4 2 5% 6% 35%	2300
	21st to end	Night	22% 9% 3 8% 5% 5% 4 3 5% 5% 30%	2717
November	1st to 10th	Night	18% 9% 3 7% 4 4 4 3 6% 6% 33%	2453
	11th to 20th	Night	17% 11% 3 7% 5% 6% 5% 3 5% 5% 33%	2577
	21st to end	Night	20% 13% 4 8% 6% 4 4 3 4 6% 28%	2660
December	1st to 10th	Night	19% 16% 5% 10% 5% 5% 5% 4 5% 4 21%	2660
	11th to 20th	Night	21% 15% 4 9% 5% 5% 4 3 4 5% 26%	3288
	21st to end	Night	28% 17% 4 9% 4 3 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	60% 6% 8% 16% 9% 1	3119
	11th to 20th	Day	57% 6% 11% 13% 10% 2	3334
	21st to end	Day	46% 5% 8% 19% 19% 3	4129
April	1st to 10th	Day	55% 4 9% 19% 12% 3	2280
	11th to 20th	Day	50% 5% 7% 21% 15% 2	2254
	21st to end	Day	54% 6% 7% 16% 13% 4	2413
May	1st to 10th	Day	52% 7% 9% 20% 10% 2	4437
	11th to 20th	Day	49% 8% 15% 18% 9% 2	4402
	21st to end	Day	44% 7% 11% 23% 14% 1	4837
June	1st to 10th	Day	52% 7% 9% 18% 12% 1	2660
	11th to 20th	Day	43% 7% 13% 21% 13% 3	2660
	21st to end	Day	53% 8% 12% 17% 9% 1	2660
July	1st to 10th	Day	42% 9% 14% 24% 10%	4370
	11th to 20th	Day	41% 9% 15% 28% 8%	4365
	21st to end	Day	35% 7% 15% 32% 10%	4661
August	1st to 10th	Day	45% 9% 16% 21% 9%	4409
	11th to 20th	Day	42% 9% 16% 26% 7%	4034
	21st to end	Day	40% 8% 18% 20% 14% 1	4180
September	1st to 10th	Day	39% 8% 13% 27% 13%	2280
	11th to 20th	Day	35% 6% 14% 31% 14% 1	2219
	21st to end	Day	41% 7% 14% 26% 11%	2090
October	1st to 10th	Day	44% 8% 14% 24% 10%	3202
	11th to 20th	Day	45% 6% 17% 24% 7%	3094
	21st to end	Day	44% 7% 21% 19% 8%	3081
November	1st to 10th	Day	48% 6% 15% 21% 9% 1	1698
	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	54% 5% 10% 18% 10% 3	3734
	11th to 20th	Night	58% 6% 10% 14% 10% 2	3622
	21st to end	Night	48% 4 7% 22% 15% 3	3502
April	1st to 10th	Night	52% 5% 8% 18% 14% 2	1900
	11th to 20th	Night	49% 5% 7% 21% 15% 2	1875
	21st to end	Night	50% 6% 9% 18% 14% 4	1767
May	1st to 10th	Night	52% 6% 11% 19% 9% 3	2552
	11th to 20th	Night	45% 8% 11% 20% 13% 2	2496
	21st to end	Night	46% 7% 9% 19% 18% 2	2739
June	1st to 10th	Night	48% 7% 11% 21% 12% 1	1520
	11th to 20th	Night	43% 6% 11% 23% 15% 2	1520
	21st to end	Night	47% 8% 11% 19% 14% 1	1520
July	1st to 10th	Night	44% 8% 16% 19% 12% 1	2480
	11th to 20th	Night	39% 7% 17% 29% 8%	2472
	21st to end	Night	36% 8% 17% 25% 14%	2651
August	1st to 10th	Night	43% 8% 13% 27% 9%	2496
	11th to 20th	Night	42% 8% 18% 26% 7%	2824
	21st to end	Night	40% 9% 15% 22% 13% 1	3476
September	1st to 10th	Night	37% 7% 12% 27% 16% 1	1900
	11th to 20th	Night	34% 6% 13% 34% 12% 1	1959
	21st to end	Night	39% 7% 11% 29% 14%	2090
October	1st to 10th	Night	42% 6% 15% 25% 11% 1	3754
	11th to 20th	Night	42% 6% 14% 28% 10%	3823
	21st to end	Night	45% 6% 18% 18% 11% 1	4467
November	1st to 10th	Night	50% 6% 14% 21% 9% 1	2453
	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% 28% 15% 7% 2	506
April	1st to 10th	Day	31% 16% 32% 14% 6% 1	460
	11th to 20th	Day	31% 22% 23% 17% 6% 1	452
	21st to end	Day	30% 19% 30% 15% 5% 2	460
May	1st to 10th	Day	25% 18% 33% 17% 5% 1	463
	11th to 20th	Day	22% 17% 31% 22% 6% 2	487
	21st to end	Day	22% 18% 32% 20% 8% 1	529
June	1st to 10th	Day	23% 17% 32% 19% 8%	490
	11th to 20th	Day	18% 16% 32% 24% 10% 2	490
	21st to end	Day	26% 14% 29% 22% 7% 2	490
July	1st to 10th	Day	13% 11% 36% 26% 11% 4	485
	11th to 20th	Day	17% 9% 35% 29% 9% 2	484
	21st to end	Day	15% 9% 35% 28% 12% 2	532
August	1st to 10th	Day	17% 8% 27% 32% 14% 2	486
	11th to 20th	Day	12% 11% 25% 30% 15% 6%	479
	21st to end	Day	16% 11% 31% 22% 14% 6%	539
September	1st to 10th	Day	16% 8% 35% 23% 12% 5%	490
	11th to 20th	Day	12% 9% 27% 25% 19% 8%	490
	21st to end	Day	20% 13% 27% 23% 13% 4	490
October	1st to 10th	Day	24% 15% 28% 20% 12% 1	490
	11th to 20th	Day	23% 19% 29% 19% 8% 1	477
	21st to end	Day	31% 15% 29% 20% 4	429
November	1st to 10th	Day	28% 16% 29% 20% 6% 1	374
	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	760
	11th to 20th	Night	26% 14% 33% 23% 5% 1	751
	21st to end	Night	27% 12% 34% 18% 9%	627
May	1st to 10th	Night	25% 10% 34% 23% 6% 3	399
	11th to 20th	Night	21% 11% 32% 28% 9%	374
	21st to end	Night	16% 11% 38% 27% 8%	411
June	1st to 10th	Night	24% 9% 28% 29% 9% 1	380
	11th to 20th	Night	21% 6% 30% 32% 11% 1	380
	21st to end	Night	21% 5% 29% 30% 14% 1	380
July	1st to 10th	Night	11% 8% 29% 37% 14% 1	370
	11th to 20th	Night	13% 7% 23% 41% 17%	368
	21st to end	Night	14% 4 28% 38% 14% 1	416
August	1st to 10th	Night	15% 3 22% 42% 18% 1	378
	11th to 20th	Night	13% 4 24% 34% 22% 2	563
	21st to end	Night	15% 7% 24% 34% 18% 2	836
September	1st to 10th	Night	14% 6% 29% 37% 14% 1	760
	11th to 20th	Night	17% 7% 20% 32% 24% 1	760
	21st to end	Night	20% 6% 27% 28% 16% 2	760
October	1st to 10th	Night	23% 9% 26% 30% 11% 1	760
	11th to 20th	Night	26% 12% 28% 26% 7% 1	760
	21st to end	Night	28% 13% 29% 25% 5%	836
November	1st to 10th	Night	25% 14% 28% 25% 7% 1	755
	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

Page generated at 2024-11-01 22:47:46. Version ac07

Copyright © 2024 Attilla Danko.