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 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	15% 10% 4 9% 6% 6% 5% 4 6% 7% 29%	101844
	Night	15% 12% 4 10% 6% 5% 5% 4 5% 6% 27%	97885
Transparency	Day	54% 5% 13% 20% 8% 1	105266
	Night	58% 4 12% 19% 7% 1	102553
Seeing	Day	20% 10% 29% 26% 12% 3	15235
	Night	22% 9% 29% 30% 10% 1	23696

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	12% 15% 8% 15% 8% 6% 6% 5% 4 5% 17%	2495
	11th to 20th	Day	11% 13% 6% 15% 10% 7% 6% 5% 6% 6% 15%	2520
	21st to end	Day	7% 13% 5% 14% 8% 6% 5% 3 5% 6% 27%	2772
February	1st to 10th	Day	6% 13% 5% 11% 9% 9% 7% 5% 6% 6% 22%	1520
	11th to 20th	Day	11% 12% 6% 13% 8% 8% 6% 4 5% 6% 21%	1747
	21st to end	Day	11% 14% 4 10% 7% 6% 5% 4 7% 6% 25%	1570
March	1st to 10th	Day	12% 13% 4 10% 6% 4 4 3 5% 5% 33%	3116
	11th to 20th	Day	13% 16% 5% 10% 6% 5% 5% 4 5% 6% 24%	3245
	21st to end	Day	11% 12% 3 9% 5% 4 5% 5% 6% 8% 32%	4163
April	1st to 10th	Day	15% 15% 4 11% 7% 5% 4 3 4 5% 25%	2280
	11th to 20th	Day	17% 9% 3 8% 5% 5% 4 4 5% 6% 34%	2328
	21st to end	Day	20% 9% 4 7% 6% 4 4 4 5% 6% 31%	2471
May	1st to 10th	Day	15% 9% 3 8% 5% 5% 6% 4 6% 7% 31%	4426
	11th to 20th	Day	15% 8% 3 7% 5% 5% 5% 5% 6% 7% 33%	4398
	21st to end	Day	14% 8% 3 7% 6% 5% 5% 4 6% 8% 34%	4992
June	1st to 10th	Day	18% 8% 3 7% 5% 5% 6% 4 6% 7% 30%	2850
	11th to 20th	Day	15% 7% 3 7% 6% 5% 5% 4 7% 8% 33%	2850
	21st to end	Day	21% 8% 3 7% 5% 6% 5% 4 6% 6% 29%	2850
July	1st to 10th	Day	15% 8% 3 7% 5% 6% 6% 5% 7% 9% 31%	4638
	11th to 20th	Day	13% 6% 3 8% 6% 7% 6% 5% 7% 9% 31%	4440
	21st to end	Day	12% 6% 3 7% 6% 5% 6% 5% 7% 8% 36%	4814
August	1st to 10th	Day	14% 6% 3 8% 6% 6% 7% 6% 8% 9% 27%	4423
	11th to 20th	Day	14% 7% 3 7% 6% 6% 6% 6% 8% 8% 29%	4182
	21st to end	Day	13% 7% 3 8% 6% 6% 6% 4 6% 7% 34%	4293
September	1st to 10th	Day	15% 6% 3 8% 5% 6% 6% 4 6% 8% 33%	2280
	11th to 20th	Day	15% 7% 3 7% 5% 4 5% 4 6% 8% 36%	2164
	21st to end	Day	20% 8% 3 8% 5% 5% 5% 3 5% 6% 32%	2090
October	1st to 10th	Day	17% 9% 3 8% 6% 6% 5% 4 6% 6% 31%	2003
	11th to 20th	Day	23% 13% 4 10% 6% 5% 5% 4 4 6% 19%	1762
	21st to end	Day	24% 12% 3 8% 5% 6% 4 4 4 6% 23%	1881
November	1st to 10th	Day	18% 12% 4 12% 8% 6% 4 3 4 4 24%	1761
	11th to 20th	Day	17% 14% 6% 10% 8% 5% 4 4 5% 6% 22%	1656
	21st to end	Day	20% 17% 6% 10% 6% 5% 5% 4 6% 6% 16%	1400
December	1st to 10th	Day	16% 18% 5% 10% 7% 5% 4 3 6% 5% 19%	1365
	11th to 20th	Day	21% 16% 4 9% 5% 4 3 2 4 7% 25%	1668
	21st to end	Day	16% 15% 6% 12% 9% 6% 6% 5% 5% 5% 16%	2431
January	1st to 10th	Night	13% 19% 6% 14% 10% 7% 5% 3 4 4 15%	4447
	11th to 20th	Night	10% 15% 5% 16% 11% 6% 5% 3 5% 5% 19%	4440
	21st to end	Night	7% 14% 7% 15% 8% 7% 5% 5% 6% 6% 21%	4884
February	1st to 10th	Night	9% 13% 5% 11% 7% 9% 6% 4 6% 6% 24%	2660
	11th to 20th	Night	8% 17% 6% 13% 9% 7% 6% 4 4 5% 21%	2318
	21st to end	Night	10% 14% 5% 10% 6% 6% 6% 5% 5% 6% 27%	1884
March	1st to 10th	Night	16% 12% 4 9% 6% 5% 7% 5% 6% 6% 24%	3724
	11th to 20th	Night	14% 16% 5% 12% 8% 5% 6% 3 5% 5% 21%	3713
	21st to end	Night	12% 14% 4 10% 6% 5% 5% 4 6% 7% 27%	3466
April	1st to 10th	Night	20% 14% 3 10% 5% 6% 4 3 4 6% 25%	1900
	11th to 20th	Night	18% 10% 2 7% 6% 5% 5% 4 5% 7% 33%	1799
	21st to end	Night	18% 11% 3 7% 5% 4 4 4 5% 5% 33%	1710
May	1st to 10th	Night	15% 10% 3 8% 6% 6% 5% 4 5% 5% 33%	2528
	11th to 20th	Night	16% 9% 3 8% 5% 5% 5% 5% 5% 7% 32%	2495
	21st to end	Night	19% 8% 2 7% 5% 5% 4 4 5% 8% 32%	2586
June	1st to 10th	Night	19% 8% 3 7% 5% 5% 4 5% 7% 8% 29%	1330
	11th to 20th	Night	15% 8% 4 6% 5% 4 5% 4 6% 6% 37%	1330
	21st to end	Night	16% 7% 3 8% 6% 5% 5% 5% 6% 8% 31%	1330
July	1st to 10th	Night	12% 6% 2 9% 6% 6% 6% 6% 9% 7% 31%	2324
	11th to 20th	Night	10% 6% 3 7% 6% 5% 6% 4 7% 9% 36%	2520
	21st to end	Night	10% 5% 3 6% 4 5% 6% 5% 7% 8% 41%	2739
August	1st to 10th	Night	14% 5% 3 7% 5% 5% 6% 5% 7% 10% 34%	2506
	11th to 20th	Night	17% 7% 2 6% 4 4 4 4 6% 8% 36%	2614
	21st to end	Night	13% 6% 3 6% 5% 5% 5% 4 6% 8% 39%	3347
September	1st to 10th	Night	14% 7% 3 7% 5% 5% 4 4 4 7% 40%	1900
	11th to 20th	Night	18% 7% 3 7% 4 4 4 4 5% 6% 39%	2015
	21st to end	Night	18% 7% 2 7% 6% 5% 5% 4 5% 6% 36%	2090
October	1st to 10th	Night	17% 8% 3 6% 4 4 6% 4 6% 8% 35%	2175
	11th to 20th	Night	25% 13% 4 8% 5% 5% 5% 4 4 6% 23%	2418
	21st to end	Night	25% 12% 3 8% 5% 5% 6% 4 5% 6% 21%	2717
November	1st to 10th	Night	19% 14% 4 9% 5% 5% 4 4 6% 6% 24%	2537
	11th to 20th	Night	18% 13% 4 12% 6% 5% 5% 4 5% 6% 22%	2740
	21st to end	Night	19% 17% 5% 12% 7% 5% 5% 4 5% 4 16%	3000
December	1st to 10th	Night	16% 18% 6% 13% 8% 5% 4 3 4 5% 18%	2932
	11th to 20th	Night	20% 15% 5% 10% 5% 5% 4 4 5% 5% 22%	3531
	21st to end	Night	13% 19% 7% 13% 7% 5% 4 3 4 4 20%	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	70% 3 12% 11% 3	2496
	11th to 20th	Day	69% 2 11% 13% 4	2520
	21st to end	Day	59% 2 11% 19% 9%	2772
February	1st to 10th	Day	60% 5% 8% 17% 9% 1	1520
	11th to 20th	Day	63% 5% 8% 15% 8%	1756
	21st to end	Day	57% 4 9% 20% 8% 2	1570
March	1st to 10th	Day	53% 3 12% 19% 11% 1	3119
	11th to 20th	Day	61% 2 11% 19% 6%	3245
	21st to end	Day	50% 3 10% 18% 16% 2	4163
April	1st to 10th	Day	62% 4 9% 14% 9% 2	2280
	11th to 20th	Day	51% 4 8% 24% 12% 2	2328
	21st to end	Day	53% 4 8% 20% 13% 1	2471
May	1st to 10th	Day	52% 3 11% 19% 14% 1	4440
	11th to 20th	Day	50% 3 10% 25% 12% 1	4402
	21st to end	Day	48% 4 7% 22% 17% 2	4992
June	1st to 10th	Day	52% 5% 8% 21% 12% 1	2850
	11th to 20th	Day	46% 5% 11% 23% 12% 2	2850
	21st to end	Day	53% 6% 11% 19% 10%	2850
July	1st to 10th	Day	47% 6% 14% 28% 4	4566
	11th to 20th	Day	47% 7% 17% 23% 5%	4365
	21st to end	Day	44% 6% 18% 24% 8%	4661
August	1st to 10th	Day	48% 8% 18% 23% 3	4409
	11th to 20th	Day	48% 8% 21% 19% 4	4224
	21st to end	Day	47% 6% 14% 22% 11%	4293
September	1st to 10th	Day	49% 5% 16% 23% 8%	2280
	11th to 20th	Day	46% 6% 18% 23% 7%	2164
	21st to end	Day	53% 5% 14% 21% 6%	2090
October	1st to 10th	Day	53% 7% 14% 22% 4 1	3328
	11th to 20th	Day	65% 5% 14% 14% 2	2900
	21st to end	Day	58% 7% 17% 14% 4	3081
November	1st to 10th	Day	63% 4 11% 15% 5% 1	1761
	11th to 20th	Day	63% 3 11% 17% 4	1656
	21st to end	Day	68% 4 12% 12% 3	1400
December	1st to 10th	Day	67% 4 11% 15% 3	1365
	11th to 20th	Day	62% 3 7% 22% 5%	1668
	21st to end	Day	70% 3 9% 10% 8%	2431
January	1st to 10th	Night	74% 2 9% 11% 4	4447
	11th to 20th	Night	69% 2 9% 15% 5%	4440
	21st to end	Night	63% 3 10% 18% 5%	4884
February	1st to 10th	Night	59% 3 9% 19% 9%	2660
	11th to 20th	Night	66% 4 8% 15% 7%	2320
	21st to end	Night	57% 4 10% 21% 8%	1884
March	1st to 10th	Night	62% 2 11% 17% 7% 1	3734
	11th to 20th	Night	66% 3 9% 15% 7% 1	3714
	21st to end	Night	56% 2 8% 22% 9% 2	3466
April	1st to 10th	Night	62% 3 8% 17% 8% 2	1900
	11th to 20th	Night	52% 3 8% 25% 12%	1799
	21st to end	Night	53% 3 8% 21% 13% 2	1710
May	1st to 10th	Night	52% 2 10% 20% 14% 2	2534
	11th to 20th	Night	52% 3 9% 23% 11% 1	2496
	21st to end	Night	52% 3 8% 21% 15% 1	2587
June	1st to 10th	Night	51% 5% 11% 23% 10% 1	1330
	11th to 20th	Night	45% 5% 11% 22% 13% 3	1330
	21st to end	Night	50% 5% 12% 21% 11%	1330
July	1st to 10th	Night	47% 7% 13% 27% 5%	2286
	11th to 20th	Night	42% 7% 20% 26% 5%	2472
	21st to end	Night	40% 7% 18% 25% 11%	2651
August	1st to 10th	Night	44% 8% 20% 23% 6%	2496
	11th to 20th	Night	45% 6% 23% 22% 4	2638
	21st to end	Night	42% 7% 17% 26% 8%	3347
September	1st to 10th	Night	45% 4 16% 26% 10%	1900
	11th to 20th	Night	46% 4 18% 25% 6% 1	2015
	21st to end	Night	50% 5% 14% 25% 7%	2090
October	1st to 10th	Night	49% 7% 16% 22% 5%	3630
	11th to 20th	Night	60% 5% 13% 18% 4	4019
	21st to end	Night	61% 6% 13% 14% 6%	4467
November	1st to 10th	Night	60% 4 14% 17% 6%	2537
	11th to 20th	Night	63% 4 13% 15% 4	2740
	21st to end	Night	71% 4 10% 12% 3	3000
December	1st to 10th	Night	70% 3 11% 13% 3	2932
	11th to 20th	Night	64% 3 9% 17% 6%	3532
	21st to end	Night	69% 2 11% 12% 5% 1	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	22% 9% 30% 29% 8% 1	180
	11th to 20th	Day	15% 10% 29% 31% 13% 2	180
	21st to end	Day	15% 5% 25% 36% 15% 4	198
February	1st to 10th	Day	9% 9% 41% 27% 12% 2	180
	11th to 20th	Day	18% 13% 33% 28% 7%	356
	21st to end	Day	20% 10% 40% 21% 8% 1	382
March	1st to 10th	Day	23% 11% 31% 23% 11% 1	460
	11th to 20th	Day	22% 11% 32% 25% 9% 1	460
	21st to end	Day	22% 12% 33% 24% 9% 1	506
April	1st to 10th	Day	22% 13% 29% 26% 8% 2	460
	11th to 20th	Day	22% 12% 27% 26% 11% 2	452
	21st to end	Day	24% 13% 30% 22% 10% 1	460
May	1st to 10th	Day	23% 13% 29% 24% 8% 2	463
	11th to 20th	Day	18% 11% 29% 26% 13% 2	487
	21st to end	Day	19% 13% 33% 24% 9% 1	619
June	1st to 10th	Day	23% 8% 29% 25% 12% 3	680
	11th to 20th	Day	18% 9% 29% 31% 11% 3	680
	21st to end	Day	23% 6% 24% 31% 13% 4	680
July	1st to 10th	Day	16% 7% 30% 30% 13% 3	603
	11th to 20th	Day	17% 7% 26% 29% 16% 5%	484
	21st to end	Day	13% 6% 24% 31% 22% 3	532
August	1st to 10th	Day	15% 8% 22% 30% 17% 7%	486
	11th to 20th	Day	16% 6% 21% 30% 18% 9%	479
	21st to end	Day	16% 9% 30% 23% 15% 8%	539
September	1st to 10th	Day	19% 9% 31% 22% 15% 5%	490
	11th to 20th	Day	16% 11% 23% 28% 17% 5%	490
	21st to end	Day	22% 11% 25% 21% 15% 6%	490
October	1st to 10th	Day	19% 12% 30% 21% 12% 6%	490
	11th to 20th	Day	29% 10% 32% 18% 9% 2	417
	21st to end	Day	29% 12% 30% 21% 7% 1	429
November	1st to 10th	Day	25% 17% 32% 19% 5% 1	395
	11th to 20th	Day	27% 15% 28% 22% 6% 2	260
	21st to end	Day	33% 10% 27% 22% 9% 2	200
December	1st to 10th	Day	21% 9% 18% 27% 19% 4	190
	11th to 20th	Day	25% 13% 29% 24% 6% 3	180
	21st to end	Day	27% 13% 26% 22% 11% 2	198
January	1st to 10th	Night	24% 8% 30% 29% 9% 1	763
	11th to 20th	Night	21% 10% 29% 30% 10%	760
	21st to end	Night	14% 8% 25% 41% 12%	836
February	1st to 10th	Night	14% 7% 35% 32% 11% 1	760
	11th to 20th	Night	18% 8% 34% 33% 7% 1	743
	21st to end	Night	18% 11% 32% 31% 8% 1	628
March	1st to 10th	Night	20% 10% 30% 32% 8%	760
	11th to 20th	Night	21% 14% 28% 28% 9% 1	760
	21st to end	Night	22% 12% 30% 29% 6%	836
April	1st to 10th	Night	27% 10% 24% 32% 7% 1	760
	11th to 20th	Night	23% 11% 29% 30% 7%	675
	21st to end	Night	24% 11% 33% 27% 5%	570
May	1st to 10th	Night	24% 8% 30% 31% 7%	394
	11th to 20th	Night	21% 9% 31% 27% 10%	374
	21st to end	Night	22% 8% 40% 22% 7%	411
June	1st to 10th	Night	22% 8% 28% 33% 8% 1	380
	11th to 20th	Night	16% 6% 34% 32% 11% 1	380
	21st to end	Night	18% 8% 23% 39% 11% 1	380
July	1st to 10th	Night	17% 7% 30% 33% 12%	370
	11th to 20th	Night	12% 3 31% 39% 14% 1	368
	21st to end	Night	14% 3 25% 44% 13%	416
August	1st to 10th	Night	14% 4 22% 43% 16% 1	378
	11th to 20th	Night	19% 4 24% 33% 18% 2	455
	21st to end	Night	18% 9% 25% 29% 16% 3	759
September	1st to 10th	Night	18% 6% 29% 34% 12% 1	760
	11th to 20th	Night	21% 8% 26% 30% 13% 2	760
	21st to end	Night	23% 6% 32% 28% 11% 2	760
October	1st to 10th	Night	21% 6% 32% 28% 11% 1	760
	11th to 20th	Night	33% 9% 26% 22% 9% 1	760
	21st to end	Night	33% 10% 26% 22% 8% 1	836
November	1st to 10th	Night	30% 14% 27% 21% 7% 1	780
	11th to 20th	Night	25% 11% 32% 23% 8%	801
	21st to end	Night	29% 10% 29% 25% 6% 1	900
December	1st to 10th	Night	25% 10% 25% 29% 10% 1	878
	11th to 20th	Night	24% 11% 29% 25% 10% 2	850
	21st to end	Night	24% 11% 27% 29% 8% 1	935

Page generated at 2024-12-03 06:45:14. Version ac07

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