Saguenay-Bagotville Airport (YBG)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saguenay-Bagotville Airport (YBG) clear sky chart from 2005-11-06 to 2024-12-06.

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% 11% 4 9% 6% 5% 5% 4 5% 6% 26%	101906
	Night	17% 14% 5% 11% 6% 5% 5% 4 5% 5% 23%	97870
Transparency	Day	56% 8% 14% 16% 5% 1	105346
	Night	61% 7% 12% 15% 5%	102519
Seeing	Day	25% 17% 29% 20% 8% 1	15516
	Night	25% 15% 28% 24% 7% 1	23817

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	11% 18% 9% 19% 9% 6% 5% 4 4 4 12%	2367
	11th to 20th	Day	9% 13% 7% 19% 15% 7% 8% 4 5% 4 9%	2520
	21st to end	Day	7% 14% 6% 13% 7% 9% 6% 5% 6% 5% 21%	2772
February	1st to 10th	Day	6% 14% 5% 11% 9% 11% 9% 5% 7% 6% 17%	1520
	11th to 20th	Day	11% 16% 6% 14% 9% 8% 7% 4 5% 6% 16%	1755
	21st to end	Day	8% 15% 5% 9% 8% 8% 8% 5% 6% 5% 23%	1570
March	1st to 10th	Day	13% 11% 4 8% 5% 4 4 4 6% 7% 34%	3116
	11th to 20th	Day	16% 18% 6% 11% 7% 6% 4 3 4 5% 20%	3338
	21st to end	Day	12% 14% 5% 11% 5% 5% 4 4 5% 7% 28%	4037
April	1st to 10th	Day	18% 15% 4 11% 6% 5% 4 3 5% 5% 24%	2280
	11th to 20th	Day	19% 12% 3 8% 5% 4 4 3 4 6% 32%	2380
	21st to end	Day	20% 10% 3 7% 5% 4 4 4 6% 7% 31%	2470
May	1st to 10th	Day	18% 11% 3 7% 5% 4 4 3 4 6% 33%	4285
	11th to 20th	Day	17% 8% 3 7% 6% 5% 5% 4 6% 7% 33%	4398
	21st to end	Day	18% 8% 3 8% 5% 5% 5% 4 7% 7% 31%	5145
June	1st to 10th	Day	21% 8% 2 7% 5% 5% 5% 4 6% 7% 30%	2850
	11th to 20th	Day	17% 8% 3 8% 6% 4 5% 5% 6% 8% 32%	2850
	21st to end	Day	22% 8% 3 8% 5% 4 5% 5% 5% 6% 28%	2850
July	1st to 10th	Day	18% 8% 3 8% 5% 5% 5% 4 6% 8% 29%	4760
	11th to 20th	Day	15% 7% 3 10% 6% 6% 6% 5% 6% 7% 28%	4479
	21st to end	Day	13% 7% 3 7% 6% 6% 5% 5% 6% 8% 35%	4814
August	1st to 10th	Day	16% 7% 3 8% 6% 6% 6% 5% 8% 9% 27%	4423
	11th to 20th	Day	19% 6% 3 9% 6% 5% 6% 4 7% 9% 26%	4075
	21st to end	Day	19% 8% 3 8% 5% 5% 5% 4 5% 6% 33%	4418
September	1st to 10th	Day	20% 7% 2 8% 5% 6% 5% 3 6% 7% 32%	2280
	11th to 20th	Day	20% 6% 2 7% 4 4 4 3 5% 7% 37%	2109
	21st to end	Day	22% 9% 3 6% 4 4 4 4 4 7% 32%	2090
October	1st to 10th	Day	21% 9% 3 9% 5% 6% 4 3 5% 7% 29%	2081
	11th to 20th	Day	27% 15% 3 9% 6% 5% 4 4 4 5% 17%	1710
	21st to end	Day	26% 16% 4 9% 5% 4 3 3 4 5% 21%	1881
November	1st to 10th	Day	19% 16% 5% 11% 7% 5% 5% 4 4 4 20%	1761
	11th to 20th	Day	20% 19% 7% 11% 5% 4 4 4 4 4 17%	1658
	21st to end	Day	19% 22% 5% 13% 8% 4 4 3 4 5% 12%	1400
December	1st to 10th	Day	18% 20% 7% 15% 8% 7% 6% 4 4 4 8%	1365
	11th to 20th	Day	19% 18% 5% 13% 8% 7% 4 4 4 4 15%	1668
	21st to end	Day	19% 18% 5% 11% 11% 7% 5% 4 4 4 12%	2431
January	1st to 10th	Night	11% 20% 7% 17% 11% 9% 6% 3 4 3 9%	4579
	11th to 20th	Night	11% 17% 7% 19% 10% 6% 5% 4 5% 4 13%	4440
	21st to end	Night	7% 16% 7% 13% 9% 7% 6% 4 6% 6% 20%	4884
February	1st to 10th	Night	9% 14% 5% 12% 9% 9% 7% 5% 5% 6% 19%	2660
	11th to 20th	Night	11% 20% 6% 14% 8% 7% 5% 4 4 4 16%	2308
	21st to end	Night	11% 17% 6% 12% 7% 6% 5% 4 5% 5% 23%	1884
March	1st to 10th	Night	19% 16% 5% 10% 5% 4 7% 4 4 5% 22%	3724
	11th to 20th	Night	15% 21% 6% 13% 6% 5% 5% 4 4 5% 16%	3621
	21st to end	Night	13% 17% 5% 11% 5% 4 4 4 5% 5% 28%	3594
April	1st to 10th	Night	20% 17% 3 8% 6% 4 4 3 4 4 25%	1900
	11th to 20th	Night	22% 13% 3 7% 4 4 4 3 5% 6% 29%	1749
	21st to end	Night	21% 11% 2 6% 5% 4 4 3 5% 6% 33%	1710
May	1st to 10th	Night	23% 10% 3 6% 5% 4 4 4 5% 6% 30%	2684
	11th to 20th	Night	19% 9% 3 7% 5% 4 4 3 4 6% 35%	2495
	21st to end	Night	22% 7% 3 7% 5% 4 5% 4 5% 7% 30%	2438
June	1st to 10th	Night	19% 8% 3 7% 5% 5% 6% 5% 6% 6% 29%	1330
	11th to 20th	Night	17% 9% 3 6% 5% 4 5% 3 5% 7% 35%	1330
	21st to end	Night	22% 9% 3 7% 5% 5% 4 5% 6% 7% 27%	1330
July	1st to 10th	Night	18% 8% 4 8% 6% 6% 5% 5% 6% 7% 29%	2210
	11th to 20th	Night	15% 7% 2 7% 6% 6% 7% 6% 8% 9% 29%	2479
	21st to end	Night	14% 7% 3 7% 5% 5% 6% 5% 6% 7% 36%	2739
August	1st to 10th	Night	17% 7% 3 9% 5% 6% 6% 5% 7% 8% 28%	2506
	11th to 20th	Night	18% 8% 3 9% 6% 5% 6% 5% 6% 7% 27%	2721
	21st to end	Night	17% 7% 3 8% 5% 5% 5% 4 6% 7% 32%	3236
September	1st to 10th	Night	20% 7% 2 7% 5% 4 4 4 6% 6% 35%	1900
	11th to 20th	Night	20% 7% 2 8% 5% 5% 5% 4 5% 6% 34%	2070
	21st to end	Night	22% 8% 3 6% 5% 5% 5% 4 4 5% 34%	2090
October	1st to 10th	Night	21% 9% 3 6% 5% 4 4 3 5% 6% 33%	2096
	11th to 20th	Night	30% 14% 4 8% 5% 4 4 3 4 5% 20%	2470
	21st to end	Night	26% 15% 4 8% 4 4 4 3 5% 6% 20%	2717
November	1st to 10th	Night	23% 17% 6% 9% 5% 3 3 3 4 5% 21%	2537
	11th to 20th	Night	19% 19% 6% 12% 5% 5% 4 3 5% 5% 17%	2740
	21st to end	Night	19% 22% 7% 14% 7% 6% 4 3 4 4 12%	3000
December	1st to 10th	Night	20% 18% 7% 15% 8% 6% 5% 3 4 5% 10%	2932
	11th to 20th	Night	20% 17% 6% 14% 8% 5% 4 4 5% 5% 11%	3531
	21st to end	Night	16% 23% 7% 13% 7% 5% 4 3 3 3 16%	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% 9% 10% 8% 1	2368
	11th to 20th	Day	76% 6% 8% 6% 3	2520
	21st to end	Day	63% 7% 8% 14% 8%	2772
February	1st to 10th	Day	64% 9% 9% 12% 5% 1	1520
	11th to 20th	Day	69% 7% 10% 11% 4	1763
	21st to end	Day	60% 8% 11% 15% 5% 1	1570
March	1st to 10th	Day	50% 8% 19% 16% 6% 1	3119
	11th to 20th	Day	66% 7% 12% 11% 4	3338
	21st to end	Day	55% 6% 12% 18% 7% 2	4037
April	1st to 10th	Day	63% 5% 11% 13% 6% 2	2280
	11th to 20th	Day	53% 6% 14% 18% 8% 1	2380
	21st to end	Day	53% 8% 11% 17% 10% 1	2470
May	1st to 10th	Day	49% 9% 15% 16% 10% 1	4299
	11th to 20th	Day	46% 11% 13% 21% 8% 1	4402
	21st to end	Day	48% 9% 12% 20% 10% 1	5145
June	1st to 10th	Day	53% 8% 11% 17% 11% 1	2850
	11th to 20th	Day	49% 8% 13% 19% 10% 1	2850
	21st to end	Day	54% 9% 12% 17% 7%	2850
July	1st to 10th	Day	51% 7% 14% 25% 4	4685
	11th to 20th	Day	52% 9% 19% 17% 3	4402
	21st to end	Day	47% 8% 19% 21% 6%	4661
August	1st to 10th	Day	50% 9% 18% 20% 3	4409
	11th to 20th	Day	52% 7% 23% 14% 3	4115
	21st to end	Day	51% 7% 15% 18% 8% 1	4418
September	1st to 10th	Day	51% 8% 15% 20% 6%	2280
	11th to 20th	Day	46% 8% 19% 21% 6%	2109
	21st to end	Day	52% 8% 14% 19% 6%	2090
October	1st to 10th	Day	58% 6% 11% 20% 4	3458
	11th to 20th	Day	67% 7% 13% 12% 1	2822
	21st to end	Day	63% 6% 14% 15% 2	3081
November	1st to 10th	Day	66% 7% 13% 12% 2	1761
	11th to 20th	Day	70% 8% 9% 10% 2	1658
	21st to end	Day	75% 8% 11% 5% 1	1400
December	1st to 10th	Day	80% 5% 8% 7%	1365
	11th to 20th	Day	72% 6% 10% 9% 3	1668
	21st to end	Day	69% 11% 8% 8% 4	2431
January	1st to 10th	Night	77% 8% 8% 6% 1	4579
	11th to 20th	Night	72% 7% 10% 8% 2	4440
	21st to end	Night	63% 7% 10% 15% 5%	4884
February	1st to 10th	Night	62% 7% 10% 14% 5%	2660
	11th to 20th	Night	70% 6% 9% 12% 4	2310
	21st to end	Night	63% 4 12% 15% 6%	1884
March	1st to 10th	Night	63% 7% 12% 13% 5%	3734
	11th to 20th	Night	67% 9% 9% 10% 4	3622
	21st to end	Night	56% 7% 11% 17% 8% 1	3594
April	1st to 10th	Night	62% 5% 8% 14% 8% 2	1900
	11th to 20th	Night	55% 6% 9% 19% 11%	1749
	21st to end	Night	51% 7% 9% 21% 10% 2	1710
May	1st to 10th	Night	51% 10% 11% 16% 11% 1	2690
	11th to 20th	Night	46% 9% 12% 22% 10% 1	2496
	21st to end	Night	49% 10% 12% 17% 12% 1	2439
June	1st to 10th	Night	51% 10% 11% 19% 7% 2	1330
	11th to 20th	Night	48% 6% 13% 18% 11% 3	1330
	21st to end	Night	54% 9% 12% 17% 8%	1330
July	1st to 10th	Night	52% 7% 14% 22% 5%	2175
	11th to 20th	Night	47% 10% 19% 19% 3	2433
	21st to end	Night	45% 9% 18% 19% 8%	2651
August	1st to 10th	Night	49% 10% 19% 17% 4	2496
	11th to 20th	Night	53% 11% 19% 13% 3	2747
	21st to end	Night	49% 9% 12% 25% 5%	3236
September	1st to 10th	Night	48% 9% 14% 20% 8%	1900
	11th to 20th	Night	51% 8% 16% 19% 6%	2070
	21st to end	Night	51% 8% 13% 21% 7%	2090
October	1st to 10th	Night	55% 5% 12% 23% 4 1	3499
	11th to 20th	Night	65% 5% 12% 16% 3	4097
	21st to end	Night	65% 6% 14% 12% 3	4467
November	1st to 10th	Night	66% 7% 13% 11% 3	2537
	11th to 20th	Night	69% 6% 11% 11% 3	2740
	21st to end	Night	77% 6% 10% 6% 1	3000
December	1st to 10th	Night	77% 6% 10% 6% 1	2932
	11th to 20th	Night	75% 6% 7% 9% 2	3532
	21st to end	Night	71% 8% 9% 10% 2	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	23% 21% 35% 17% 4	180
	11th to 20th	Day	23% 20% 31% 21% 5% 1	180
	21st to end	Day	17% 19% 34% 23% 5% 2	198
February	1st to 10th	Day	17% 23% 46% 9% 3 1	180
	11th to 20th	Day	23% 22% 34% 16% 5%	396
	21st to end	Day	24% 24% 30% 16% 5%	382
March	1st to 10th	Day	27% 16% 33% 19% 5%	460
	11th to 20th	Day	27% 22% 29% 15% 7% 1	460
	21st to end	Day	28% 21% 29% 16% 5%	506
April	1st to 10th	Day	31% 20% 27% 18% 3 1	460
	11th to 20th	Day	30% 17% 29% 17% 6% 1	452
	21st to end	Day	28% 20% 33% 14% 5% 1	460
May	1st to 10th	Day	29% 20% 28% 15% 7% 1	463
	11th to 20th	Day	20% 15% 33% 23% 7% 1	487
	21st to end	Day	27% 18% 30% 18% 6% 1	707
June	1st to 10th	Day	25% 14% 30% 24% 6% 1	680
	11th to 20th	Day	21% 15% 30% 22% 11% 1	680
	21st to end	Day	22% 14% 30% 23% 9% 1	680
July	1st to 10th	Day	22% 13% 29% 27% 10%	670
	11th to 20th	Day	19% 13% 31% 26% 9% 2	508
	21st to end	Day	18% 12% 30% 27% 12% 1	532
August	1st to 10th	Day	22% 11% 28% 26% 9% 4	486
	11th to 20th	Day	18% 13% 25% 28% 14% 3	479
	21st to end	Day	23% 15% 25% 20% 12% 5%	539
September	1st to 10th	Day	23% 16% 29% 19% 9% 4	490
	11th to 20th	Day	22% 15% 27% 23% 9% 4	490
	21st to end	Day	26% 17% 24% 19% 11% 3	490
October	1st to 10th	Day	24% 16% 28% 19% 10% 3	490
	11th to 20th	Day	36% 18% 24% 13% 8% 2	390
	21st to end	Day	35% 21% 24% 16% 4 1	429
November	1st to 10th	Day	37% 20% 25% 14% 4	395
	11th to 20th	Day	31% 19% 25% 19% 5% 1	349
	21st to end	Day	36% 23% 28% 12% 3	200
December	1st to 10th	Day	27% 15% 32% 19% 7% 1	190
	11th to 20th	Day	27% 28% 30% 9% 6% 1	180
	21st to end	Day	26% 31% 21% 17% 5%	198
January	1st to 10th	Night	25% 17% 33% 20% 5%	801
	11th to 20th	Night	24% 17% 28% 23% 6% 1	760
	21st to end	Night	17% 14% 34% 28% 7% 1	836
February	1st to 10th	Night	14% 18% 38% 24% 6% 1	760
	11th to 20th	Night	23% 19% 31% 21% 6%	743
	21st to end	Night	21% 17% 34% 20% 7% 1	628
March	1st to 10th	Night	24% 15% 35% 22% 4	760
	11th to 20th	Night	25% 17% 31% 18% 9%	760
	21st to end	Night	22% 20% 30% 22% 5%	836
April	1st to 10th	Night	29% 16% 29% 21% 4 1	760
	11th to 20th	Night	28% 15% 30% 23% 5%	625
	21st to end	Night	27% 15% 31% 22% 5%	570
May	1st to 10th	Night	31% 13% 28% 22% 5%	485
	11th to 20th	Night	21% 10% 30% 29% 9%	374
	21st to end	Night	28% 13% 30% 23% 6%	411
June	1st to 10th	Night	19% 9% 36% 31% 6% 1	380
	11th to 20th	Night	17% 12% 26% 32% 12% 1	380
	21st to end	Night	21% 9% 29% 32% 7% 1	380
July	1st to 10th	Night	23% 8% 30% 29% 9%	370
	11th to 20th	Night	16% 7% 25% 39% 13%	368
	21st to end	Night	21% 6% 26% 34% 12%	416
August	1st to 10th	Night	18% 8% 24% 37% 12% 1	378
	11th to 20th	Night	20% 8% 23% 31% 17% 1	525
	21st to end	Night	22% 9% 24% 31% 12% 1	687
September	1st to 10th	Night	23% 13% 26% 27% 10% 1	760
	11th to 20th	Night	25% 9% 29% 25% 11% 2	760
	21st to end	Night	25% 12% 26% 25% 10% 2	760
October	1st to 10th	Night	25% 13% 26% 25% 10% 1	760
	11th to 20th	Night	36% 15% 23% 18% 8% 1	760
	21st to end	Night	36% 16% 24% 19% 5%	836
November	1st to 10th	Night	35% 17% 24% 18% 6% 1	780
	11th to 20th	Night	28% 20% 26% 19% 6% 1	845
	21st to end	Night	30% 20% 28% 17% 4 1	900
December	1st to 10th	Night	31% 15% 27% 20% 7% 1	878
	11th to 20th	Night	27% 19% 26% 20% 7% 1	850
	21st to end	Night	26% 20% 27% 20% 6% 1	935

Page generated at 2024-12-03 06:45:15. Version ac07

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