Riviere-du-Loup
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Riviere-du-Loup 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	16% 10% 3 8% 5% 5% 5% 4 6% 7% 32%	101907
	Night	17% 13% 4 9% 6% 5% 5% 4 5% 6% 27%	97862
Transparency	Day	53% 3 14% 21% 8% 1	105355
	Night	59% 3 12% 19% 7% 1	102491
Seeing	Day	25% 12% 30% 22% 9% 2	15789
	Night	26% 11% 29% 25% 8% 1	23941

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	14% 18% 6% 10% 6% 5% 7% 6% 5% 6% 17%	2271
	11th to 20th	Day	11% 15% 6% 12% 9% 6% 5% 4 6% 5% 20%	2520
	21st to end	Day	8% 9% 5% 10% 8% 7% 6% 5% 6% 7% 30%	2772
February	1st to 10th	Day	8% 15% 5% 10% 9% 8% 6% 4 6% 7% 22%	1576
	11th to 20th	Day	13% 15% 6% 11% 7% 6% 5% 3 5% 6% 23%	1729
	21st to end	Day	12% 12% 4 8% 6% 6% 6% 4 5% 6% 30%	1570
March	1st to 10th	Day	16% 12% 4 9% 5% 5% 4 4 6% 6% 29%	3116
	11th to 20th	Day	17% 20% 5% 8% 6% 5% 4 3 5% 5% 22%	3433
	21st to end	Day	15% 17% 4 8% 5% 3 3 3 4 4 33%	3905
April	1st to 10th	Day	20% 12% 3 8% 6% 4 3 4 5% 7% 27%	2280
	11th to 20th	Day	19% 9% 3 7% 4 3 3 3 5% 6% 37%	2431
	21st to end	Day	22% 10% 3 6% 4 4 4 3 4 6% 34%	2470
May	1st to 10th	Day	17% 8% 3 7% 5% 5% 5% 3 5% 7% 34%	4106
	11th to 20th	Day	16% 9% 3 8% 5% 4 4 4 5% 7% 36%	4477
	21st to end	Day	17% 8% 2 8% 5% 5% 5% 4 7% 8% 32%	5185
June	1st to 10th	Day	19% 9% 3 7% 5% 5% 4 4 5% 7% 33%	2850
	11th to 20th	Day	18% 6% 2 7% 4 4 5% 4 6% 8% 37%	2850
	21st to end	Day	20% 8% 3 8% 5% 5% 4 4 6% 7% 29%	2850
July	1st to 10th	Day	14% 7% 3 7% 5% 4 5% 5% 7% 8% 36%	4760
	11th to 20th	Day	13% 6% 2 7% 5% 5% 6% 5% 7% 7% 36%	4605
	21st to end	Day	11% 7% 2 7% 5% 4 5% 4 6% 8% 42%	4814
August	1st to 10th	Day	14% 7% 3 7% 5% 6% 6% 5% 7% 9% 33%	4310
	11th to 20th	Day	17% 7% 3 7% 4 5% 5% 4 7% 8% 32%	4045
	21st to end	Day	17% 6% 2 6% 4 4 4 3 5% 7% 40%	4532
September	1st to 10th	Day	15% 6% 2 6% 4 4 4 4 5% 9% 41%	2252
	11th to 20th	Day	16% 8% 2 5% 3 3 4 2 5% 6% 47%	2090
	21st to end	Day	18% 6% 2 6% 4 3 4 3 5% 6% 42%	2090
October	1st to 10th	Day	18% 8% 2 7% 5% 4 5% 4 5% 7% 34%	2039
	11th to 20th	Day	24% 8% 3 7% 5% 4 5% 4 6% 6% 28%	1784
	21st to end	Day	25% 12% 4 7% 4 4 4 3 4 5% 29%	1881
November	1st to 10th	Day	18% 13% 4 7% 6% 4 4 4 5% 6% 28%	1761
	11th to 20th	Day	20% 13% 5% 9% 6% 4 3 4 6% 5% 23%	1637
	21st to end	Day	20% 18% 5% 9% 5% 4 4 3 5% 5% 23%	1452
December	1st to 10th	Day	20% 15% 5% 11% 8% 6% 4 4 4 7% 17%	1365
	11th to 20th	Day	20% 19% 3 9% 7% 5% 3 4 4 6% 20%	1668
	21st to end	Day	22% 14% 5% 8% 5% 4 3 3 3 4 28%	2431
January	1st to 10th	Night	12% 17% 6% 15% 9% 7% 6% 4 5% 4 15%	4680
	11th to 20th	Night	12% 16% 6% 14% 8% 5% 5% 3 5% 5% 20%	4440
	21st to end	Night	8% 14% 7% 12% 7% 6% 4 4 6% 7% 26%	4884
February	1st to 10th	Night	10% 14% 5% 11% 8% 5% 5% 4 6% 6% 25%	2603
	11th to 20th	Night	12% 18% 7% 13% 7% 4 4 4 5% 4 22%	2332
	21st to end	Night	13% 16% 5% 10% 7% 4 4 3 5% 6% 28%	1884
March	1st to 10th	Night	18% 13% 4 10% 6% 5% 6% 4 4 5% 24%	3724
	11th to 20th	Night	16% 24% 5% 11% 6% 4 4 3 4 5% 18%	3525
	21st to end	Night	20% 17% 4 7% 4 4 3 2 3 5% 30%	3725
April	1st to 10th	Night	23% 15% 4 8% 5% 4 3 3 4 5% 28%	1900
	11th to 20th	Night	21% 10% 4 9% 5% 4 5% 3 4 6% 31%	1698
	21st to end	Night	25% 10% 3 7% 4 4 3 2 4 5% 32%	1710
May	1st to 10th	Night	21% 8% 2 7% 5% 4 4 4 6% 7% 32%	2834
	11th to 20th	Night	18% 10% 3 8% 5% 5% 5% 4 5% 6% 30%	2435
	21st to end	Night	20% 8% 3 8% 4 5% 5% 4 7% 8% 29%	2401
June	1st to 10th	Night	19% 10% 2 8% 6% 6% 4 4 5% 6% 28%	1330
	11th to 20th	Night	17% 7% 2 7% 5% 4 4 3 6% 8% 35%	1330
	21st to end	Night	22% 11% 4 8% 5% 4 5% 4 5% 7% 27%	1330
July	1st to 10th	Night	18% 6% 3 9% 5% 5% 5% 5% 6% 8% 32%	2210
	11th to 20th	Night	16% 6% 3 8% 6% 5% 5% 5% 5% 9% 33%	2356
	21st to end	Night	12% 5% 3 6% 4 5% 6% 4 7% 8% 39%	2739
August	1st to 10th	Night	17% 7% 3 7% 6% 5% 5% 4 6% 7% 32%	2588
	11th to 20th	Night	16% 8% 4 11% 7% 5% 7% 5% 6% 7% 24%	2782
	21st to end	Night	18% 7% 3 7% 4 3 3 3 5% 7% 40%	3124
September	1st to 10th	Night	16% 7% 2 7% 4 5% 4 3 6% 6% 38%	1925
	11th to 20th	Night	18% 8% 3 7% 4 4 4 3 4 5% 39%	2090
	21st to end	Night	17% 8% 3 6% 4 3 3 3 4 6% 42%	2090
October	1st to 10th	Night	18% 9% 3 7% 4 3 3 3 5% 5% 39%	2140
	11th to 20th	Night	25% 10% 3 6% 5% 4 5% 3 5% 5% 28%	2394
	21st to end	Night	23% 10% 4 9% 4 4 4 3 5% 7% 27%	2717
November	1st to 10th	Night	21% 14% 3 8% 5% 4 4 3 5% 6% 28%	2537
	11th to 20th	Night	21% 14% 4 8% 5% 4 4 3 5% 5% 27%	2761
	21st to end	Night	20% 17% 5% 9% 6% 5% 4 4 5% 5% 20%	2945
December	1st to 10th	Night	20% 17% 6% 10% 6% 4 4 4 5% 5% 18%	2932
	11th to 20th	Night	19% 17% 5% 11% 7% 6% 5% 4 6% 6% 15%	3531
	21st to end	Night	18% 16% 4 10% 6% 5% 5% 4 4 4 23%	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% 13% 1	2272
	11th to 20th	Day	66% 2 7% 19% 5% 1	2520
	21st to end	Day	54% 3 14% 19% 10%	2772
February	1st to 10th	Day	61% 3 14% 15% 7% 2	1576
	11th to 20th	Day	64% 2 10% 17% 6%	1737
	21st to end	Day	55% 3 9% 21% 11% 1	1570
March	1st to 10th	Day	58% 2 13% 16% 8% 3	3119
	11th to 20th	Day	67% 2 10% 15% 6% 1	3433
	21st to end	Day	58% 2 6% 22% 9% 3	3905
April	1st to 10th	Day	58% 4 10% 17% 10% 2	2280
	11th to 20th	Day	50% 3 10% 24% 11% 2	2431
	21st to end	Day	54% 3 7% 21% 13% 2	2470
May	1st to 10th	Day	52% 2 12% 23% 11% 1	4120
	11th to 20th	Day	51% 2 14% 24% 8% 1	4481
	21st to end	Day	51% 4 10% 26% 9% 1	5185
June	1st to 10th	Day	52% 4 11% 22% 12% 1	2850
	11th to 20th	Day	46% 5% 16% 21% 12% 1	2850
	21st to end	Day	53% 4 13% 20% 8% 1	2850
July	1st to 10th	Day	47% 3 18% 26% 7%	4685
	11th to 20th	Day	45% 4 24% 22% 5%	4524
	21st to end	Day	42% 4 22% 24% 8%	4661
August	1st to 10th	Day	45% 5% 21% 23% 6%	4296
	11th to 20th	Day	50% 3 21% 21% 4	4084
	21st to end	Day	45% 3 19% 21% 11%	4532
September	1st to 10th	Day	41% 4 16% 28% 11%	2252
	11th to 20th	Day	39% 4 16% 28% 11% 1	2090
	21st to end	Day	46% 3 15% 26% 10%	2090
October	1st to 10th	Day	57% 4 12% 21% 6%	3390
	11th to 20th	Day	58% 3 16% 20% 2	2935
	21st to end	Day	56% 2 15% 22% 5%	3081
November	1st to 10th	Day	59% 4 12% 20% 5% 1	1761
	11th to 20th	Day	63% 4 9% 19% 5%	1637
	21st to end	Day	66% 4 12% 14% 4	1452
December	1st to 10th	Day	72% 2 11% 12% 3	1365
	11th to 20th	Day	68% 3 7% 17% 4	1668
	21st to end	Day	64% 3 13% 16% 4 1	2431
January	1st to 10th	Night	72% 3 11% 13% 2	4680
	11th to 20th	Night	67% 3 9% 14% 7%	4440
	21st to end	Night	58% 3 10% 20% 8%	4884
February	1st to 10th	Night	60% 4 12% 16% 8% 1	2603
	11th to 20th	Night	67% 3 9% 14% 7%	2335
	21st to end	Night	59% 2 9% 21% 8% 1	1884
March	1st to 10th	Night	63% 2 10% 18% 7%	3734
	11th to 20th	Night	72% 1 9% 13% 5%	3526
	21st to end	Night	60% 2 6% 23% 8% 1	3725
April	1st to 10th	Night	62% 3 6% 15% 11% 3	1900
	11th to 20th	Night	56% 3 8% 19% 13% 1	1698
	21st to end	Night	56% 2 6% 21% 13% 2	1710
May	1st to 10th	Night	53% 3 12% 18% 12% 1	2840
	11th to 20th	Night	55% 2 11% 21% 9% 1	2436
	21st to end	Night	53% 3 10% 23% 9% 1	2402
June	1st to 10th	Night	55% 4 10% 20% 10% 1	1330
	11th to 20th	Night	47% 4 13% 19% 14% 3	1330
	21st to end	Night	56% 3 13% 17% 10%	1330
July	1st to 10th	Night	50% 4 16% 26% 4	2175
	11th to 20th	Night	48% 4 24% 20% 4	2314
	21st to end	Night	43% 4 24% 21% 8%	2651
August	1st to 10th	Night	51% 4 18% 22% 5%	2578
	11th to 20th	Night	57% 6% 20% 12% 5%	2809
	21st to end	Night	46% 3 14% 26% 11%	3124
September	1st to 10th	Night	48% 3 12% 26% 10% 1	1925
	11th to 20th	Night	48% 3 16% 23% 9% 1	2090
	21st to end	Night	46% 5% 12% 26% 11% 1	2090
October	1st to 10th	Night	50% 3 11% 29% 6% 1	3569
	11th to 20th	Night	58% 2 14% 22% 4	3969
	21st to end	Night	58% 4 16% 18% 4	4467
November	1st to 10th	Night	60% 4 13% 16% 5%	2537
	11th to 20th	Night	60% 4 12% 17% 6%	2761
	21st to end	Night	68% 4 12% 13% 4	2945
December	1st to 10th	Night	70% 3 11% 13% 3	2932
	11th to 20th	Night	71% 5% 8% 14% 2	3532
	21st to end	Night	68% 3 11% 14% 4	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	25% 18% 35% 17% 3 1	180
	11th to 20th	Day	23% 17% 37% 18% 5% 1	180
	21st to end	Day	17% 19% 35% 17% 11% 2	198
February	1st to 10th	Day	22% 22% 28% 22% 5% 2	236
	11th to 20th	Day	21% 18% 40% 19% 2	397
	21st to end	Day	22% 18% 35% 19% 6% 1	382
March	1st to 10th	Day	25% 13% 33% 24% 5% 1	460
	11th to 20th	Day	26% 14% 28% 22% 8% 2	460
	21st to end	Day	29% 17% 29% 18% 6% 3	506
April	1st to 10th	Day	29% 17% 27% 22% 5% 2	460
	11th to 20th	Day	28% 13% 28% 23% 5% 2	452
	21st to end	Day	28% 14% 31% 18% 6% 3	460
May	1st to 10th	Day	27% 14% 29% 18% 10% 2	463
	11th to 20th	Day	23% 12% 29% 24% 9% 2	529
	21st to end	Day	25% 13% 34% 19% 7% 1	735
June	1st to 10th	Day	27% 9% 30% 23% 10% 1	680
	11th to 20th	Day	26% 7% 31% 24% 10% 3	680
	21st to end	Day	25% 5% 30% 27% 12% 1	680
July	1st to 10th	Day	21% 10% 29% 29% 10% 1	670
	11th to 20th	Day	16% 6% 35% 26% 14% 2	578
	21st to end	Day	17% 6% 32% 31% 12% 2	532
August	1st to 10th	Day	18% 9% 29% 28% 13% 3	486
	11th to 20th	Day	19% 6% 26% 31% 16% 2	479
	21st to end	Day	19% 11% 27% 24% 14% 6%	539
September	1st to 10th	Day	20% 10% 28% 26% 12% 4	490
	11th to 20th	Day	22% 9% 29% 25% 11% 4	490
	21st to end	Day	23% 11% 28% 24% 9% 6%	490
October	1st to 10th	Day	23% 12% 30% 22% 10% 4	463
	11th to 20th	Day	35% 14% 24% 17% 9% 2	390
	21st to end	Day	34% 14% 29% 16% 6% 1	429
November	1st to 10th	Day	35% 15% 31% 17% 3 1	395
	11th to 20th	Day	33% 14% 27% 19% 6% 2	400
	21st to end	Day	36% 15% 31% 15% 3	252
December	1st to 10th	Day	26% 18% 35% 13% 6% 2	190
	11th to 20th	Day	32% 18% 33% 14% 2 1	180
	21st to end	Day	32% 23% 21% 21% 4	198
January	1st to 10th	Night	25% 16% 32% 20% 6% 1	830
	11th to 20th	Night	25% 16% 32% 22% 5%	760
	21st to end	Night	16% 12% 34% 29% 8% 1	836
February	1st to 10th	Night	18% 14% 38% 23% 6% 1	760
	11th to 20th	Night	23% 14% 33% 23% 6% 1	743
	21st to end	Night	21% 14% 34% 23% 7% 1	628
March	1st to 10th	Night	23% 11% 36% 23% 7% 1	760
	11th to 20th	Night	28% 13% 32% 18% 8% 1	760
	21st to end	Night	27% 14% 29% 23% 6% 2	836
April	1st to 10th	Night	33% 9% 29% 22% 6% 1	760
	11th to 20th	Night	29% 9% 26% 26% 9% 1	574
	21st to end	Night	32% 10% 25% 24% 8% 1	570
May	1st to 10th	Night	30% 8% 26% 29% 8% 1	570
	11th to 20th	Night	24% 8% 24% 32% 11% 1	392
	21st to end	Night	29% 9% 28% 24% 9% 1	411
June	1st to 10th	Night	23% 6% 23% 37% 9% 1	380
	11th to 20th	Night	21% 6% 23% 36% 13% 1	380
	21st to end	Night	27% 5% 27% 31% 10% 1	380
July	1st to 10th	Night	21% 6% 29% 33% 11% 1	370
	11th to 20th	Night	19% 4 26% 37% 13% 1	368
	21st to end	Night	17% 4 25% 39% 14% 1	416
August	1st to 10th	Night	19% 3 21% 41% 16% 1	421
	11th to 20th	Night	19% 3 25% 38% 14% 1	562
	21st to end	Night	18% 6% 25% 34% 14% 2	627
September	1st to 10th	Night	22% 6% 28% 31% 11% 2	747
	11th to 20th	Night	24% 6% 27% 29% 12% 3	760
	21st to end	Night	23% 6% 28% 29% 12% 2	760
October	1st to 10th	Night	26% 8% 29% 25% 9% 2	760
	11th to 20th	Night	34% 10% 24% 23% 9% 1	760
	21st to end	Night	31% 11% 28% 22% 8%	836
November	1st to 10th	Night	33% 13% 29% 20% 5%	780
	11th to 20th	Night	31% 16% 27% 19% 7% 1	881
	21st to end	Night	31% 15% 30% 19% 5%	900
December	1st to 10th	Night	30% 12% 31% 19% 6% 1	878
	11th to 20th	Night	28% 17% 31% 19% 5%	850
	21st to end	Night	29% 16% 28% 21% 6% 1	935

Page generated at 2024-12-03 06:45:11. Version ac07

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