Reserve Faunique La Verendrye
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Reserve Faunique La Verendrye clear sky chart from 2005-11-06 to 2025-10-19.

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	16% 12% 4 10% 6% 5% 5% 4 5% 6% 27%	127291
	Night	16% 14% 5% 11% 6% 5% 5% 3 5% 5% 26%	122365
Transparency	Day	58% 3 9% 20% 9% 1	130757
	Night	61% 2 9% 17% 9% 1	126987
Seeing	Day	26% 14% 32% 18% 7% 2	15741
	Night	26% 12% 30% 23% 8% 1	24531

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	13% 18% 7% 19% 12% 7% 5% 3 3 4 11%	3597
	11th to 20th	Day	9% 17% 8% 19% 10% 6% 3 3 5% 5% 15%	3570
	21st to end	Day	9% 16% 9% 17% 6% 4 5% 5% 6% 5% 18%	4075
February	1st to 10th	Day	8% 19% 8% 15% 9% 6% 5% 4 4 6% 16%	1800
	11th to 20th	Day	11% 17% 8% 15% 7% 5% 4 3 4 6% 20%	1753
	21st to end	Day	17% 18% 5% 10% 6% 6% 5% 4 4 6% 21%	1595
March	1st to 10th	Day	19% 18% 4 12% 5% 4 5% 3 4 4 22%	4540
	11th to 20th	Day	14% 14% 5% 13% 7% 5% 5% 3 4 5% 25%	4980
	21st to end	Day	15% 14% 5% 10% 5% 4 4 3 3 4 32%	5728
April	1st to 10th	Day	21% 17% 4 8% 4 4 2 2 3 4 30%	2400
	11th to 20th	Day	22% 13% 4 8% 3 3 3 2 4 6% 31%	2374
	21st to end	Day	20% 13% 4 9% 5% 4 4 3 4 5% 31%	2642
May	1st to 10th	Day	21% 13% 4 7% 4 4 4 4 5% 6% 29%	6346
	11th to 20th	Day	17% 10% 3 8% 5% 5% 6% 4 5% 7% 31%	6318
	21st to end	Day	20% 10% 3 8% 5% 5% 5% 3 5% 6% 31%	6949
June	1st to 10th	Day	22% 9% 3 8% 5% 5% 6% 4 6% 7% 25%	2800
	11th to 20th	Day	14% 8% 3 7% 6% 6% 5% 4 6% 8% 34%	2800
	21st to end	Day	19% 8% 3 9% 6% 5% 5% 4 6% 7% 27%	2991
July	1st to 10th	Day	18% 8% 3 7% 6% 5% 5% 4 7% 9% 29%	6433
	11th to 20th	Day	13% 8% 2 7% 5% 5% 5% 4 7% 9% 36%	6360
	21st to end	Day	12% 6% 3 7% 4 4 5% 4 7% 9% 38%	6926
August	1st to 10th	Day	15% 7% 3 8% 6% 7% 6% 5% 6% 7% 30%	4532
	11th to 20th	Day	17% 7% 3 7% 4 5% 6% 4 7% 7% 33%	4174
	21st to end	Day	13% 7% 2 7% 5% 5% 6% 4 6% 8% 35%	4360
September	1st to 10th	Day	18% 8% 2 7% 4 3 5% 3 5% 7% 38%	2400
	11th to 20th	Day	16% 7% 3 7% 4 4 4 3 5% 7% 41%	2400
	21st to end	Day	20% 11% 2 7% 4 4 4 3 4 6% 34%	2117
October	1st to 10th	Day	20% 12% 4 7% 4 3 3 3 5% 8% 31%	2000
	11th to 20th	Day	25% 16% 4 9% 5% 4 4 3 4 5% 21%	1980
	21st to end	Day	27% 17% 5% 8% 5% 4 4 3 3 5% 19%	1934
November	1st to 10th	Day	17% 18% 6% 9% 4 4 4 3 3 5% 27%	1671
	11th to 20th	Day	18% 17% 7% 14% 7% 5% 4 2 4 5% 18%	1600
	21st to end	Day	23% 22% 7% 15% 6% 5% 3 2 3 4 10%	1600
December	1st to 10th	Day	17% 25% 9% 16% 6% 5% 3 2 3 4 9%	2600
	11th to 20th	Day	16% 19% 5% 14% 11% 6% 4 3 3 3 15%	2986
	21st to end	Day	17% 20% 8% 13% 8% 5% 4 3 3 4 15%	3960
January	1st to 10th	Night	11% 22% 10% 17% 9% 6% 4 2 3 3 12%	6349
	11th to 20th	Night	11% 17% 7% 16% 11% 7% 5% 4 5% 4 13%	6315
	21st to end	Night	7% 15% 10% 17% 7% 6% 7% 4 5% 6% 17%	6877
February	1st to 10th	Night	11% 13% 6% 12% 10% 8% 5% 4 5% 6% 20%	2600
	11th to 20th	Night	12% 17% 5% 12% 9% 6% 5% 4 4 5% 21%	2533
	21st to end	Night	11% 18% 4 11% 7% 7% 5% 3 6% 5% 22%	2035
March	1st to 10th	Night	17% 19% 5% 10% 6% 4 4 3 4 4 23%	5284
	11th to 20th	Night	12% 15% 5% 13% 7% 6% 5% 4 5% 6% 22%	4979
	21st to end	Night	15% 13% 4 11% 5% 6% 5% 3 5% 5% 28%	5203
April	1st to 10th	Night	19% 14% 5% 10% 5% 4 3 2 4 5% 29%	2000
	11th to 20th	Night	17% 11% 4 7% 4 4 4 3 4 5% 36%	1975
	21st to end	Night	21% 11% 4 9% 5% 4 4 3 4 5% 31%	1775
May	1st to 10th	Night	20% 12% 3 7% 4 4 4 3 4 7% 32%	3594
	11th to 20th	Night	17% 8% 3 7% 5% 4 4 3 4 6% 38%	3575
	21st to end	Night	18% 9% 3 7% 5% 5% 5% 4 5% 6% 32%	3926
June	1st to 10th	Night	17% 9% 3 8% 5% 5% 5% 5% 7% 7% 30%	1600
	11th to 20th	Night	15% 8% 3 8% 5% 4 4 3 5% 6% 38%	1596
	21st to end	Night	19% 8% 3 7% 5% 3 5% 4 6% 6% 36%	1400
July	1st to 10th	Night	15% 9% 4 9% 5% 6% 6% 5% 6% 7% 28%	3506
	11th to 20th	Night	15% 8% 3 6% 4 5% 5% 4 6% 7% 37%	3600
	21st to end	Night	12% 6% 3 6% 4 4 4 3 6% 8% 46%	3926
August	1st to 10th	Night	10% 8% 3 7% 4 4 4 4 6% 8% 41%	2613
	11th to 20th	Night	18% 8% 2 7% 4 4 4 4 5% 7% 37%	2875
	21st to end	Night	16% 6% 2 7% 4 5% 5% 4 7% 8% 36%	3504
September	1st to 10th	Night	15% 8% 2 6% 4 3 5% 4 4 8% 42%	2000
	11th to 20th	Night	16% 7% 3 5% 3 4 4 3 5% 5% 45%	2000
	21st to end	Night	19% 9% 3 6% 5% 4 3 3 4 7% 39%	2280
October	1st to 10th	Night	20% 10% 3 7% 3 4 4 3 4 6% 37%	2400
	11th to 20th	Night	23% 16% 4 8% 4 3 5% 3 3 5% 26%	2377
	21st to end	Night	24% 16% 5% 9% 5% 4 4 3 4 5% 21%	2662
November	1st to 10th	Night	18% 17% 4 9% 5% 4 5% 3 4 5% 26%	2622
	11th to 20th	Night	19% 16% 5% 13% 6% 5% 3 3 5% 5% 20%	2800
	21st to end	Night	23% 20% 7% 13% 7% 4 3 2 3 4 14%	2800
December	1st to 10th	Night	16% 20% 8% 18% 10% 6% 4 4 3 3 8%	4580
	11th to 20th	Night	20% 18% 5% 13% 7% 4 4 3 3 4 18%	5208
	21st to end	Night	18% 21% 6% 14% 8% 4 3 3 3 3 15%	6996

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	81% 1 6% 7% 4	3598
	11th to 20th	Day	74% 2 4 13% 8%	3600
	21st to end	Day	66% 2 5% 15% 11%	4075
February	1st to 10th	Day	69% 2 5% 13% 9% 1	1800
	11th to 20th	Day	68% 1 8% 11% 10% 1	1762
	21st to end	Day	67% 2 5% 15% 10% 1	1595
March	1st to 10th	Day	67% 1 5% 13% 12% 2	4543
	11th to 20th	Day	64% 2 10% 14% 10% 1	4980
	21st to end	Day	58% 1 4 18% 16% 2	5728
April	1st to 10th	Day	61% 1 7% 16% 13% 2	2400
	11th to 20th	Day	56% 2 6% 22% 12% 2	2374
	21st to end	Day	58% 2 7% 17% 15% 2	2642
May	1st to 10th	Day	57% 2 5% 20% 12% 4	6357
	11th to 20th	Day	54% 3 9% 24% 9% 1	6322
	21st to end	Day	56% 2 8% 18% 16% 1	6949
June	1st to 10th	Day	59% 3 7% 20% 11% 1	2800
	11th to 20th	Day	47% 3 11% 25% 12% 2	2800
	21st to end	Day	55% 4 11% 21% 9%	2991
July	1st to 10th	Day	51% 5% 13% 26% 5%	6364
	11th to 20th	Day	43% 5% 16% 30% 6%	6285
	21st to end	Day	42% 5% 16% 29% 9%	6728
August	1st to 10th	Day	51% 5% 12% 26% 6%	4518
	11th to 20th	Day	48% 4 14% 26% 7%	4213
	21st to end	Day	45% 4 11% 28% 11% 1	4360
September	1st to 10th	Day	47% 3 13% 25% 12% 1	2400
	11th to 20th	Day	45% 3 15% 27% 10% 1	2400
	21st to end	Day	52% 3 12% 23% 9%	2117
October	1st to 10th	Day	56% 3 9% 25% 6%	3260
	11th to 20th	Day	59% 2 13% 18% 7% 1	3220
	21st to end	Day	67% 3 13% 12% 4 1	3159
November	1st to 10th	Day	62% 3 10% 18% 7%	1671
	11th to 20th	Day	72% 2 9% 12% 6%	1600
	21st to end	Day	80% 3 6% 8% 4	1600
December	1st to 10th	Day	81% 2 5% 10% 2	2600
	11th to 20th	Day	76% 2 3 14% 5%	2986
	21st to end	Day	75% 2 5% 15% 4	3960
January	1st to 10th	Night	80% 1 8% 8% 3	6349
	11th to 20th	Night	76% 1 7% 11% 5% 1	6360
	21st to end	Night	70% 2 5% 12% 10%	6877
February	1st to 10th	Night	65% 2 7% 17% 8% 1	2600
	11th to 20th	Night	67% 2 6% 15% 8% 1	2535
	21st to end	Night	64% 2 7% 16% 9% 1	2035
March	1st to 10th	Night	67% 1 6% 11% 12% 3	5294
	11th to 20th	Night	64% 3 11% 14% 7% 1	4980
	21st to end	Night	60% 2 5% 19% 12% 2	5203
April	1st to 10th	Night	60% 1 6% 17% 14% 2	2000
	11th to 20th	Night	52% 2 5% 24% 15% 2	1975
	21st to end	Night	57% 2 7% 19% 14% 2	1775
May	1st to 10th	Night	55% 2 8% 19% 13% 3	3600
	11th to 20th	Night	49% 3 12% 21% 13% 2	3576
	21st to end	Night	53% 3 10% 19% 14% 2	3927
June	1st to 10th	Night	52% 3 10% 24% 11% 1	1600
	11th to 20th	Night	47% 3 10% 23% 14% 2	1596
	21st to end	Night	49% 4 12% 25% 10% 1	1400
July	1st to 10th	Night	54% 6% 11% 21% 7%	3466
	11th to 20th	Night	45% 5% 19% 26% 6%	3552
	21st to end	Night	39% 4 15% 31% 11%	3809
August	1st to 10th	Night	41% 5% 19% 27% 8%	2603
	11th to 20th	Night	47% 4 16% 26% 8%	2902
	21st to end	Night	45% 4 15% 25% 8% 2	3504
September	1st to 10th	Night	42% 3 17% 27% 10%	2000
	11th to 20th	Night	42% 3 16% 30% 9%	2000
	21st to end	Night	48% 3 12% 27% 9%	2280
October	1st to 10th	Night	51% 2 11% 23% 13%	3920
	11th to 20th	Night	59% 3 11% 21% 6% 1	3876
	21st to end	Night	61% 2 15% 12% 9% 1	4387
November	1st to 10th	Night	63% 2 11% 18% 6%	2622
	11th to 20th	Night	68% 2 9% 14% 7%	2800
	21st to end	Night	78% 2 7% 10% 3	2800
December	1st to 10th	Night	82% 3 5% 7% 3	4580
	11th to 20th	Night	72% 2 4 14% 7%	5208
	21st to end	Night	76% 1 3 12% 7%	6996

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	22% 21% 44% 12% 2 1	200
	11th to 20th	Day	25% 15% 39% 15% 5% 2	200
	21st to end	Day	20% 21% 36% 18% 5%	245
February	1st to 10th	Day	30% 25% 36% 6% 3	300
	11th to 20th	Day	28% 27% 34% 10% 1	300
	21st to end	Day	33% 19% 36% 10% 1	359
March	1st to 10th	Day	28% 18% 34% 15% 4	500
	11th to 20th	Day	30% 19% 32% 15% 4	500
	21st to end	Day	31% 17% 35% 13% 4 1	550
April	1st to 10th	Day	36% 18% 25% 15% 5% 1	500
	11th to 20th	Day	36% 15% 25% 14% 8% 2	492
	21st to end	Day	30% 19% 32% 14% 4 1	500
May	1st to 10th	Day	31% 14% 33% 15% 6% 1	503
	11th to 20th	Day	27% 14% 29% 20% 8% 2	527
	21st to end	Day	26% 16% 32% 18% 7% 1	573
June	1st to 10th	Day	27% 11% 36% 19% 6% 1	530
	11th to 20th	Day	22% 16% 33% 18% 9% 2	530
	21st to end	Day	23% 13% 31% 23% 9% 1	721
July	1st to 10th	Day	17% 9% 36% 28% 9% 1	560
	11th to 20th	Day	19% 9% 37% 23% 9% 2	524
	21st to end	Day	17% 11% 30% 29% 10% 2	576
August	1st to 10th	Day	18% 7% 32% 30% 9% 4	526
	11th to 20th	Day	18% 6% 29% 27% 13% 6%	519
	21st to end	Day	19% 11% 32% 21% 12% 5%	583
September	1st to 10th	Day	25% 8% 32% 20% 12% 3	530
	11th to 20th	Day	20% 8% 26% 24% 16% 6%	530
	21st to end	Day	25% 13% 26% 19% 14% 3	530
October	1st to 10th	Day	26% 14% 28% 20% 9% 2	530
	11th to 20th	Day	31% 18% 31% 15% 4 1	522
	21st to end	Day	39% 12% 29% 17% 3 1	456
November	1st to 10th	Day	34% 14% 34% 13% 4 1	305
	11th to 20th	Day	27% 22% 34% 14% 3 1	200
	21st to end	Day	34% 24% 32% 8% 3 1	200
December	1st to 10th	Day	34% 13% 33% 16% 4 1	200
	11th to 20th	Day	31% 22% 34% 9% 4 1	200
	21st to end	Day	30% 16% 39% 10% 4 1	220
January	1st to 10th	Night	31% 15% 33% 18% 3	800
	11th to 20th	Night	30% 14% 30% 21% 5% 1	800
	21st to end	Night	18% 12% 36% 26% 7% 1	880
February	1st to 10th	Night	20% 17% 36% 21% 5% 1	800
	11th to 20th	Night	24% 17% 37% 19% 3 1	783
	21st to end	Night	25% 17% 31% 23% 4	660
March	1st to 10th	Night	24% 18% 32% 22% 4	800
	11th to 20th	Night	27% 18% 31% 18% 6% 1	800
	21st to end	Night	25% 15% 33% 21% 6%	880
April	1st to 10th	Night	29% 13% 29% 23% 5%	800
	11th to 20th	Night	27% 15% 28% 21% 9% 1	791
	21st to end	Night	28% 11% 30% 23% 7% 1	575
May	1st to 10th	Night	24% 8% 30% 28% 10% 1	400
	11th to 20th	Night	25% 9% 28% 28% 9% 1	394
	21st to end	Night	23% 9% 34% 27% 8%	433
June	1st to 10th	Night	24% 7% 33% 28% 9%	400
	11th to 20th	Night	21% 9% 29% 30% 12% 1	400
	21st to end	Night	22% 7% 29% 32% 11%	400
July	1st to 10th	Night	15% 5% 32% 39% 8%	390
	11th to 20th	Night	16% 7% 26% 38% 13%	388
	21st to end	Night	15% 4 28% 38% 14%	438
August	1st to 10th	Night	14% 5% 25% 37% 19% 1	412
	11th to 20th	Night	18% 3 22% 33% 21% 3	594
	21st to end	Night	20% 5% 29% 27% 16% 3	824
September	1st to 10th	Night	21% 5% 30% 28% 13% 2	800
	11th to 20th	Night	23% 6% 26% 26% 19% 2	800
	21st to end	Night	25% 7% 26% 27% 14% 1	800
October	1st to 10th	Night	25% 10% 31% 23% 10% 1	800
	11th to 20th	Night	33% 11% 28% 20% 6% 2	793
	21st to end	Night	34% 13% 29% 20% 4 1	836
November	1st to 10th	Night	31% 14% 31% 18% 5% 1	780
	11th to 20th	Night	31% 16% 31% 15% 7% 1	800
	21st to end	Night	37% 17% 24% 18% 5% 1	800
December	1st to 10th	Night	34% 15% 29% 17% 5% 1	800
	11th to 20th	Night	31% 14% 31% 18% 5% 1	800
	21st to end	Night	34% 14% 27% 19% 5% 1	880

Page generated at 2025-10-16 01:50:25. Version ac07

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