Saint-Felicien
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saint-Felicien clear sky chart from 2005-11-06 to 2026-03-18.

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	15% 10% 4 9% 6% 5% 5% 4 6% 7% 28%	131020
	Night	15% 12% 4 11% 7% 6% 5% 4 5% 6% 26%	130538
Transparency	Day	55% 5% 12% 20% 8% 1	134424
	Night	59% 4 11% 18% 7%	135222
Seeing	Day	20% 10% 29% 26% 12% 3	16791
	Night	22% 9% 29% 30% 10% 1	25392

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% 20% 7% 13% 6% 5% 6% 5% 5% 4 17%	4639
	11th to 20th	Day	8% 15% 8% 19% 9% 6% 6% 5% 5% 5% 14%	4650
	21st to end	Day	4 8% 4 16% 8% 6% 8% 5% 7% 6% 26%	5124
February	1st to 10th	Day	6% 12% 5% 12% 9% 9% 7% 5% 6% 6% 23%	1680
	11th to 20th	Day	10% 13% 6% 12% 8% 7% 6% 4 5% 6% 22%	1937
	21st to end	Day	10% 13% 4 11% 7% 6% 5% 5% 7% 6% 26%	1730
March	1st to 10th	Day	13% 18% 5% 10% 5% 4 4 3 4 5% 28%	4576
	11th to 20th	Day	15% 15% 4 10% 6% 6% 5% 4 5% 6% 23%	4717
	21st to end	Day	12% 12% 3 9% 5% 4 4 5% 5% 7% 33%	5967
April	1st to 10th	Day	15% 15% 4 12% 7% 5% 4 3 4 5% 25%	2400
	11th to 20th	Day	17% 9% 3 8% 5% 5% 4 4 5% 5% 34%	2452
	21st to end	Day	20% 9% 4 7% 6% 4 4 4 5% 6% 30%	2601
May	1st to 10th	Day	19% 9% 3 7% 5% 5% 5% 4 6% 7% 30%	6346
	11th to 20th	Day	24% 8% 3 7% 5% 4 5% 4 5% 6% 30%	6318
	21st to end	Day	15% 8% 3 8% 5% 5% 5% 4 5% 7% 33%	7174
June	1st to 10th	Day	18% 8% 3 7% 5% 5% 6% 4 6% 7% 30%	3000
	11th to 20th	Day	15% 7% 2 7% 6% 5% 5% 5% 7% 8% 33%	3000
	21st to end	Day	21% 8% 3 7% 5% 6% 5% 4 6% 6% 29%	3000
July	1st to 10th	Day	17% 8% 3 7% 5% 5% 6% 5% 7% 9% 30%	6642
	11th to 20th	Day	14% 5% 3 8% 6% 6% 6% 5% 7% 8% 31%	6360
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 6% 9% 39%	6926
August	1st to 10th	Day	14% 6% 3 8% 6% 6% 7% 6% 8% 9% 28%	4563
	11th to 20th	Day	14% 7% 3 7% 6% 6% 6% 6% 8% 8% 30%	4317
	21st to end	Day	13% 7% 3 8% 6% 6% 6% 4 6% 7% 34%	4429
September	1st to 10th	Day	15% 6% 3 8% 5% 6% 6% 4 6% 8% 33%	2400
	11th to 20th	Day	14% 7% 3 7% 5% 4 5% 4 6% 8% 37%	2278
	21st to end	Day	20% 8% 3 8% 5% 5% 6% 3 5% 6% 33%	2200
October	1st to 10th	Day	17% 9% 3 8% 5% 6% 5% 4 6% 6% 32%	2108
	11th to 20th	Day	22% 13% 4 10% 6% 5% 5% 4 4 6% 20%	1855
	21st to end	Day	24% 13% 3 8% 5% 6% 4 4 4 6% 23%	1980
November	1st to 10th	Day	18% 13% 4 12% 8% 7% 4 3 4 4 23%	1851
	11th to 20th	Day	17% 15% 6% 10% 7% 4 4 4 5% 5% 22%	1739
	21st to end	Day	20% 17% 6% 10% 6% 5% 4 4 6% 6% 15%	1470
December	1st to 10th	Day	15% 17% 6% 11% 6% 4 4 3 5% 5% 23%	2350
	11th to 20th	Day	18% 14% 4 12% 7% 7% 5% 3 4 5% 21%	2688
	21st to end	Day	15% 13% 5% 11% 10% 7% 5% 4 5% 5% 19%	3553
January	1st to 10th	Night	13% 22% 7% 14% 7% 6% 5% 3 4 5% 14%	8252
	11th to 20th	Night	8% 20% 7% 21% 10% 6% 5% 3 3 4 13%	8235
	21st to end	Night	4 8% 5% 16% 10% 9% 8% 7% 7% 6% 21%	9057
February	1st to 10th	Night	8% 12% 5% 12% 7% 9% 6% 4 6% 6% 25%	2940
	11th to 20th	Night	8% 18% 6% 13% 8% 7% 5% 4 4 5% 22%	2568
	21st to end	Night	9% 14% 5% 10% 6% 6% 6% 5% 5% 6% 27%	2076
March	1st to 10th	Night	16% 14% 5% 11% 6% 4 7% 5% 5% 6% 21%	5484
	11th to 20th	Night	15% 14% 5% 12% 8% 6% 6% 4 5% 5% 21%	5396
	21st to end	Night	14% 14% 4 9% 5% 4 4 4 5% 7% 29%	4962
April	1st to 10th	Night	19% 14% 3 10% 5% 5% 5% 3 4 5% 25%	2000
	11th to 20th	Night	18% 10% 2 7% 5% 5% 4 4 5% 7% 33%	1895
	21st to end	Night	19% 11% 3 8% 5% 4 4 4 5% 5% 33%	1800
May	1st to 10th	Night	16% 9% 3 7% 5% 5% 5% 3 5% 6% 35%	3622
	11th to 20th	Night	25% 9% 3 8% 5% 5% 5% 4 4 5% 29%	3575
	21st to end	Night	20% 8% 3 7% 5% 5% 4 3 5% 7% 34%	3709
June	1st to 10th	Night	19% 8% 3 7% 5% 5% 4 5% 6% 8% 30%	1400
	11th to 20th	Night	15% 8% 3 6% 5% 4 5% 4 6% 6% 37%	1400
	21st to end	Night	17% 7% 3 8% 6% 5% 5% 4 6% 8% 32%	1400
July	1st to 10th	Night	12% 6% 2 9% 6% 6% 6% 5% 9% 8% 30%	3326
	11th to 20th	Night	14% 6% 3 7% 5% 5% 6% 4 8% 9% 33%	3600
	21st to end	Night	11% 5% 3 7% 4 5% 5% 4 6% 8% 43%	3926
August	1st to 10th	Night	14% 5% 3 7% 5% 5% 6% 5% 7% 10% 34%	2586
	11th to 20th	Night	17% 7% 2 6% 4 4 4 4 6% 8% 37%	2698
	21st to end	Night	14% 6% 3 7% 5% 5% 4 4 6% 8% 38%	3453
September	1st to 10th	Night	14% 7% 2 7% 5% 5% 4 4 5% 7% 40%	2000
	11th to 20th	Night	17% 7% 3 7% 4 4 4 3 5% 6% 40%	2121
	21st to end	Night	18% 7% 2 7% 5% 5% 4 4 5% 6% 37%	2200
October	1st to 10th	Night	17% 8% 3 6% 4 4 6% 4 6% 7% 36%	2290
	11th to 20th	Night	24% 12% 4 7% 4 5% 5% 4 5% 6% 24%	2545
	21st to end	Night	25% 13% 3 8% 5% 5% 5% 4 5% 6% 21%	2860
November	1st to 10th	Night	20% 14% 4 9% 5% 5% 4 4 6% 6% 24%	2667
	11th to 20th	Night	18% 14% 5% 12% 6% 5% 5% 4 5% 6% 21%	2877
	21st to end	Night	19% 17% 5% 13% 7% 5% 5% 4 5% 4 16%	3150
December	1st to 10th	Night	12% 15% 8% 18% 9% 5% 5% 3 4 5% 17%	5060
	11th to 20th	Night	20% 14% 5% 11% 8% 5% 5% 4 4 4 21%	5741
	21st to end	Night	14% 17% 6% 13% 7% 7% 4 3 4 4 21%	7667

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	70% 4 9% 15% 2	4640
	11th to 20th	Day	71% 3 9% 11% 5%	4680
	21st to end	Day	54% 4 12% 22% 8%	5124
February	1st to 10th	Day	59% 5% 9% 17% 9% 1	1680
	11th to 20th	Day	62% 5% 8% 16% 8% 1	1946
	21st to end	Day	55% 5% 9% 20% 9% 2	1730
March	1st to 10th	Day	59% 3 9% 15% 14% 1	4579
	11th to 20th	Day	61% 4 11% 16% 8%	4717
	21st to end	Day	51% 3 8% 19% 17% 2	5967
April	1st to 10th	Day	61% 4 9% 15% 9% 2	2400
	11th to 20th	Day	51% 4 8% 24% 12% 2	2452
	21st to end	Day	54% 4 8% 20% 13% 1	2601
May	1st to 10th	Day	53% 4 10% 17% 14% 1	6357
	11th to 20th	Day	56% 3 8% 21% 11% 1	6322
	21st to end	Day	50% 5% 8% 20% 16% 2	7174
June	1st to 10th	Day	51% 5% 9% 22% 12% 1	3000
	11th to 20th	Day	46% 6% 11% 22% 13% 2	3000
	21st to end	Day	53% 6% 11% 19% 10% 1	3000
July	1st to 10th	Day	49% 6% 13% 28% 3	6570
	11th to 20th	Day	47% 8% 16% 25% 4	6285
	21st to end	Day	41% 6% 18% 27% 9%	6728
August	1st to 10th	Day	47% 8% 18% 23% 3	4549
	11th to 20th	Day	47% 8% 21% 20% 4	4359
	21st to end	Day	47% 6% 14% 22% 10%	4429
September	1st to 10th	Day	48% 5% 17% 22% 7%	2400
	11th to 20th	Day	45% 6% 18% 24% 7%	2278
	21st to end	Day	52% 5% 14% 22% 6%	2200
October	1st to 10th	Day	52% 7% 14% 22% 4 1	3433
	11th to 20th	Day	64% 5% 13% 15% 2	2993
	21st to end	Day	59% 7% 16% 14% 3	3180
November	1st to 10th	Day	64% 4 11% 15% 5% 1	1851
	11th to 20th	Day	64% 3 11% 17% 4	1739
	21st to end	Day	69% 4 12% 12% 3	1470
December	1st to 10th	Day	64% 4 14% 16% 2	2350
	11th to 20th	Day	66% 4 8% 15% 7%	2688
	21st to end	Day	67% 4 8% 15% 5%	3553
January	1st to 10th	Night	75% 3 7% 12% 3	8252
	11th to 20th	Night	77% 3 6% 10% 4	8280
	21st to end	Night	59% 5% 11% 18% 7%	9057
February	1st to 10th	Night	58% 3 10% 20% 9%	2940
	11th to 20th	Night	65% 3 9% 15% 7%	2570
	21st to end	Night	57% 4 9% 22% 8%	2076
March	1st to 10th	Night	65% 3 8% 15% 8%	5494
	11th to 20th	Night	64% 5% 9% 14% 8% 1	5397
	21st to end	Night	56% 2 7% 24% 10% 1	4962
April	1st to 10th	Night	62% 3 8% 17% 8% 2	2000
	11th to 20th	Night	51% 3 8% 25% 12%	1895
	21st to end	Night	54% 3 8% 21% 12% 2	1800
May	1st to 10th	Night	50% 3 9% 22% 14% 1	3628
	11th to 20th	Night	58% 3 7% 20% 10% 2	3576
	21st to end	Night	51% 4 10% 18% 15% 3	3710
June	1st to 10th	Night	51% 4 11% 23% 10% 1	1400
	11th to 20th	Night	46% 6% 11% 22% 13% 3	1400
	21st to end	Night	50% 5% 12% 21% 11% 1	1400
July	1st to 10th	Night	47% 7% 13% 24% 8%	3288
	11th to 20th	Night	44% 7% 20% 24% 4	3552
	21st to end	Night	39% 7% 15% 30% 8%	3809
August	1st to 10th	Night	43% 7% 20% 23% 6%	2576
	11th to 20th	Night	44% 6% 23% 22% 5%	2722
	21st to end	Night	42% 7% 17% 26% 8%	3453
September	1st to 10th	Night	44% 4 16% 26% 9%	2000
	11th to 20th	Night	45% 4 18% 27% 6% 1	2121
	21st to end	Night	48% 5% 13% 25% 8%	2200
October	1st to 10th	Night	48% 7% 16% 23% 5%	3745
	11th to 20th	Night	60% 5% 13% 18% 5%	4146
	21st to end	Night	61% 6% 13% 14% 6%	4610
November	1st to 10th	Night	60% 4 14% 17% 5%	2667
	11th to 20th	Night	64% 4 13% 15% 4	2877
	21st to end	Night	71% 4 10% 12% 3	3150
December	1st to 10th	Night	71% 4 11% 11% 2	5060
	11th to 20th	Night	67% 4 8% 18% 4	5742
	21st to end	Night	67% 3 9% 15% 5% 1	7667

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% 8% 28% 31% 8% 1	220
	11th to 20th	Day	13% 10% 30% 30% 15% 2	220
	21st to end	Day	13% 5% 26% 36% 14% 4	242
February	1st to 10th	Day	9% 7% 40% 26% 15% 3	220
	11th to 20th	Day	19% 14% 30% 30% 7%	426
	21st to end	Day	18% 10% 37% 25% 9% 2	446
March	1st to 10th	Day	23% 12% 30% 24% 10% 1	540
	11th to 20th	Day	23% 12% 32% 23% 8% 1	528
	21st to end	Day	21% 13% 31% 25% 9% 1	550
April	1st to 10th	Day	22% 14% 28% 26% 8% 2	500
	11th to 20th	Day	23% 12% 26% 25% 11% 4	492
	21st to end	Day	25% 12% 30% 22% 10% 1	500
May	1st to 10th	Day	24% 13% 29% 24% 8% 2	503
	11th to 20th	Day	19% 11% 29% 26% 13% 2	527
	21st to end	Day	19% 12% 32% 24% 10% 2	668
June	1st to 10th	Day	22% 8% 30% 25% 12% 3	730
	11th to 20th	Day	18% 9% 30% 31% 10% 2	730
	21st to end	Day	23% 6% 24% 31% 12% 3	730
July	1st to 10th	Day	17% 8% 30% 30% 13% 3	649
	11th to 20th	Day	18% 7% 27% 29% 15% 5%	524
	21st to end	Day	13% 7% 26% 30% 21% 3	576
August	1st to 10th	Day	14% 8% 21% 29% 19% 8%	526
	11th to 20th	Day	15% 6% 22% 31% 17% 9%	519
	21st to end	Day	16% 8% 30% 22% 16% 8%	583
September	1st to 10th	Day	18% 9% 32% 21% 15% 5%	530
	11th to 20th	Day	15% 11% 24% 27% 17% 6%	530
	21st to end	Day	21% 12% 25% 22% 15% 5%	530
October	1st to 10th	Day	19% 12% 30% 22% 12% 5%	530
	11th to 20th	Day	28% 10% 31% 20% 10% 2	450
	21st to end	Day	29% 12% 29% 22% 8% 1	462
November	1st to 10th	Day	25% 17% 32% 19% 5% 1	425
	11th to 20th	Day	26% 15% 28% 23% 6% 2	283
	21st to end	Day	31% 10% 27% 21% 9% 1	220
December	1st to 10th	Day	20% 9% 22% 29% 17% 4	220
	11th to 20th	Day	24% 13% 29% 23% 9% 3	220
	21st to end	Day	25% 12% 25% 24% 12% 1	242
January	1st to 10th	Night	25% 9% 29% 28% 9% 1	843
	11th to 20th	Night	21% 10% 28% 29% 11%	840
	21st to end	Night	13% 7% 26% 42% 12% 1	924
February	1st to 10th	Night	13% 7% 34% 33% 12% 2	840
	11th to 20th	Night	18% 8% 34% 32% 7%	823
	21st to end	Night	17% 10% 31% 32% 9% 1	692
March	1st to 10th	Night	20% 11% 30% 31% 8%	840
	11th to 20th	Night	21% 14% 28% 28% 8% 1	829
	21st to end	Night	22% 12% 30% 30% 6%	880
April	1st to 10th	Night	27% 11% 26% 31% 7% 1	800
	11th to 20th	Night	23% 11% 28% 30% 8%	711
	21st to end	Night	25% 11% 33% 26% 5%	600
May	1st to 10th	Night	24% 7% 30% 32% 7%	415
	11th to 20th	Night	22% 9% 31% 27% 10%	394
	21st to end	Night	22% 8% 39% 23% 7%	433
June	1st to 10th	Night	22% 8% 28% 34% 8% 1	400
	11th to 20th	Night	16% 7% 34% 32% 11% 1	400
	21st to end	Night	18% 9% 23% 39% 11% 1	400
July	1st to 10th	Night	17% 7% 29% 34% 12%	390
	11th to 20th	Night	12% 4 30% 39% 14% 1	388
	21st to end	Night	14% 4 25% 44% 12%	438
August	1st to 10th	Night	13% 4 21% 44% 16% 2	398
	11th to 20th	Night	19% 4 23% 34% 18% 1	479
	21st to end	Night	18% 9% 25% 30% 16% 3	799
September	1st to 10th	Night	17% 7% 28% 34% 13% 1	800
	11th to 20th	Night	21% 8% 26% 30% 14% 2	800
	21st to end	Night	22% 6% 32% 28% 11% 2	800
October	1st to 10th	Night	21% 6% 32% 29% 10% 1	800
	11th to 20th	Night	32% 9% 27% 22% 10% 1	800
	21st to end	Night	33% 11% 26% 22% 8% 1	880
November	1st to 10th	Night	30% 14% 28% 21% 7% 1	820
	11th to 20th	Night	25% 11% 32% 23% 8%	841
	21st to end	Night	29% 10% 29% 25% 6% 1	950
December	1st to 10th	Night	23% 9% 27% 30% 10% 1	950
	11th to 20th	Night	23% 12% 29% 25% 10% 1	950
	21st to end	Night	24% 10% 26% 30% 9% 1	1045

Page generated at 2026-03-15 02:23:51. Version ac07

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