Havre-Saint-Pierre
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Havre-Saint-Pierre 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	18% 10% 3 8% 5% 4 4 3 5% 6% 33%	131136
	Night	18% 12% 4 9% 5% 4 4 3 5% 6% 30%	130619
Transparency	Day	51% 6% 13% 20% 9% 1	134548
	Night	54% 6% 11% 19% 9% 1	135301
Seeing	Day	24% 7% 23% 29% 14% 3	18431
	Night	24% 8% 26% 29% 12% 2	25939

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	15% 19% 5% 11% 4 3 3 2 3 4 30%	4093
	11th to 20th	Day	11% 19% 7% 15% 6% 4 5% 3 4 6% 20%	4084
	21st to end	Day	5% 9% 4 10% 7% 6% 5% 5% 7% 14% 30%	4872
February	1st to 10th	Day	9% 13% 4 11% 6% 5% 5% 4 5% 6% 32%	1890
	11th to 20th	Day	11% 15% 5% 11% 6% 6% 3 3 5% 6% 30%	1843
	21st to end	Day	10% 13% 5% 8% 5% 5% 4 4 4 5% 37%	1557
March	1st to 10th	Day	15% 13% 5% 9% 5% 5% 4 3 4 6% 30%	4774
	11th to 20th	Day	19% 19% 5% 9% 5% 4 4 3 4 5% 24%	5057
	21st to end	Day	22% 17% 4 9% 5% 4 4 3 4 4 25%	5571
April	1st to 10th	Day	21% 14% 4 7% 4 5% 4 3 4 6% 28%	2400
	11th to 20th	Day	16% 11% 3 6% 4 4 4 3 5% 6% 38%	2543
	21st to end	Day	24% 11% 3 5% 4 3 3 2 4 5% 36%	2657
May	1st to 10th	Day	29% 9% 3 7% 4 4 3 3 4 6% 28%	6345
	11th to 20th	Day	20% 7% 3 7% 4 4 5% 4 5% 6% 34%	6318
	21st to end	Day	26% 9% 3 7% 3 3 3 3 4 5% 34%	7394
June	1st to 10th	Day	25% 8% 3 7% 5% 4 4 3 5% 6% 31%	3000
	11th to 20th	Day	22% 6% 2 5% 5% 4 4 4 6% 7% 34%	3000
	21st to end	Day	23% 8% 2 7% 5% 4 4 4 5% 7% 32%	3000
July	1st to 10th	Day	14% 8% 3 8% 5% 5% 4 4 6% 6% 38%	6820
	11th to 20th	Day	17% 7% 3 7% 5% 4 5% 4 7% 7% 34%	6820
	21st to end	Day	15% 5% 2 6% 4 4 4 3 6% 8% 42%	7233
August	1st to 10th	Day	15% 5% 2 5% 4 4 4 4 7% 8% 41%	4540
	11th to 20th	Day	20% 10% 4 9% 5% 5% 5% 3 6% 6% 28%	4175
	21st to end	Day	14% 5% 2 6% 4 4 4 3 6% 8% 44%	4609
September	1st to 10th	Day	20% 5% 2 6% 4 4 5% 4 5% 7% 40%	2400
	11th to 20th	Day	23% 7% 2 6% 3 3 3 3 5% 6% 39%	2370
	21st to end	Day	21% 5% 2 6% 4 4 4 4 4 5% 40%	2108
October	1st to 10th	Day	19% 7% 2 6% 4 4 4 4 5% 6% 39%	2000
	11th to 20th	Day	25% 8% 2 7% 4 4 4 3 4 7% 33%	2000
	21st to end	Day	23% 11% 3 8% 5% 3 3 3 4 5% 32%	1965
November	1st to 10th	Day	22% 11% 3 8% 4 4 4 3 4 5% 31%	1645
	11th to 20th	Day	24% 15% 3 7% 4 4 4 3 4 5% 28%	1680
	21st to end	Day	24% 16% 4 8% 5% 3 4 2 4 4 27%	1680
December	1st to 10th	Day	12% 14% 7% 11% 6% 5% 5% 3 5% 6% 26%	2452
	11th to 20th	Day	21% 12% 6% 9% 4 5% 4 3 5% 7% 26%	2688
	21st to end	Day	15% 13% 4 7% 4 4 4 3 4 6% 35%	3553
January	1st to 10th	Night	16% 20% 6% 11% 5% 4 3 3 4 5% 25%	8831
	11th to 20th	Night	12% 15% 6% 13% 6% 4 4 3 5% 7% 25%	8831
	21st to end	Night	5% 10% 5% 13% 7% 5% 5% 3 5% 9% 34%	9332
February	1st to 10th	Night	9% 15% 5% 10% 5% 5% 4 3 5% 7% 31%	2730
	11th to 20th	Night	12% 17% 5% 8% 5% 5% 5% 3 5% 5% 29%	2663
	21st to end	Night	9% 15% 5% 9% 6% 5% 4 4 4 6% 32%	2249
March	1st to 10th	Night	15% 13% 5% 10% 5% 4 4 3 4 5% 33%	5281
	11th to 20th	Night	21% 19% 5% 9% 5% 4 4 3 4 4 22%	5057
	21st to end	Night	21% 18% 5% 9% 4 4 3 3 4 4 25%	5360
April	1st to 10th	Night	22% 14% 3 8% 5% 4 5% 3 5% 5% 26%	2000
	11th to 20th	Night	19% 11% 3 6% 4 5% 3 4 4 5% 36%	1803
	21st to end	Night	24% 9% 4 7% 5% 3 4 3 4 5% 32%	1742
May	1st to 10th	Night	31% 10% 3 6% 4 3 2 3 4 5% 29%	3615
	11th to 20th	Night	20% 8% 3 6% 4 4 4 4 5% 6% 35%	3596
	21st to end	Night	24% 8% 3 6% 4 4 4 3 6% 6% 32%	3546
June	1st to 10th	Night	26% 7% 3 6% 5% 5% 5% 4 5% 7% 28%	1400
	11th to 20th	Night	23% 8% 2 5% 4 4 4 3 6% 8% 32%	1400
	21st to end	Night	26% 8% 3 7% 6% 5% 4 3 4 5% 29%	1400
July	1st to 10th	Night	19% 8% 3 7% 5% 4 5% 4 6% 8% 33%	3160
	11th to 20th	Night	16% 9% 4 7% 5% 5% 5% 4 6% 8% 31%	3160
	21st to end	Night	15% 8% 3 7% 4 4 4 4 6% 8% 39%	3582
August	1st to 10th	Night	14% 9% 3 8% 5% 4 4 4 6% 8% 34%	2617
	11th to 20th	Night	19% 7% 3 7% 5% 5% 5% 3 4 6% 34%	2872
	21st to end	Night	18% 8% 3 8% 4 5% 4 3 5% 7% 37%	3289
September	1st to 10th	Night	23% 7% 2 5% 4 4 3 4 5% 6% 40%	2000
	11th to 20th	Night	23% 6% 2 7% 4 4 4 3 4 6% 38%	2026
	21st to end	Night	24% 6% 2 5% 3 4 4 3 5% 6% 38%	2291
October	1st to 10th	Night	23% 8% 2 6% 5% 4 4 3 5% 5% 36%	2400
	11th to 20th	Night	28% 8% 3 6% 4 3 4 3 4 4 32%	2400
	21st to end	Night	24% 9% 3 7% 4 4 3 3 5% 6% 31%	2869
November	1st to 10th	Night	24% 10% 3 7% 4 3 4 4 4 6% 31%	2873
	11th to 20th	Night	26% 14% 4 7% 4 4 3 3 4 4 25%	2940
	21st to end	Night	24% 17% 4 8% 4 3 4 3 4 4 25%	2940
December	1st to 10th	Night	13% 16% 6% 11% 6% 4 4 3 4 5% 28%	4956
	11th to 20th	Night	21% 11% 5% 9% 4 5% 4 4 5% 6% 26%	5741
	21st to end	Night	14% 15% 4 7% 5% 4 4 3 5% 7% 32%	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	61% 4 8% 16% 9% 1	4094
	11th to 20th	Day	66% 10% 10% 12% 2	4110
	21st to end	Day	44% 9% 14% 15% 16% 2	4872
February	1st to 10th	Day	52% 7% 11% 17% 12% 1	1890
	11th to 20th	Day	57% 6% 10% 17% 10%	1851
	21st to end	Day	51% 6% 11% 21% 11% 1	1557
March	1st to 10th	Day	55% 6% 9% 13% 15% 2	4778
	11th to 20th	Day	63% 4 9% 14% 9% 2	5057
	21st to end	Day	62% 4 8% 16% 9% 2	5571
April	1st to 10th	Day	57% 5% 11% 13% 12% 2	2400
	11th to 20th	Day	48% 5% 11% 21% 13% 2	2543
	21st to end	Day	52% 4 13% 18% 12% 1	2657
May	1st to 10th	Day	57% 4 10% 20% 8% 1	6357
	11th to 20th	Day	49% 5% 13% 24% 8%	6322
	21st to end	Day	52% 4 12% 22% 9% 1	7394
June	1st to 10th	Day	54% 5% 13% 18% 9% 1	3000
	11th to 20th	Day	48% 7% 14% 22% 9% 1	3000
	21st to end	Day	51% 7% 12% 20% 9%	3000
July	1st to 10th	Day	45% 5% 12% 29% 9%	6745
	11th to 20th	Day	47% 6% 18% 22% 7%	6739
	21st to end	Day	40% 5% 18% 27% 10%	7025
August	1st to 10th	Day	39% 8% 21% 28% 4	4526
	11th to 20th	Day	54% 6% 17% 17% 6%	4214
	21st to end	Day	36% 6% 19% 29% 10%	4609
September	1st to 10th	Day	44% 6% 17% 24% 8%	2400
	11th to 20th	Day	46% 6% 17% 22% 8%	2370
	21st to end	Day	45% 6% 15% 24% 9%	2108
October	1st to 10th	Day	50% 5% 14% 25% 5%	3260
	11th to 20th	Day	51% 5% 15% 22% 7%	3240
	21st to end	Day	50% 4 13% 19% 13%	3161
November	1st to 10th	Day	56% 7% 12% 15% 10% 1	1645
	11th to 20th	Day	62% 6% 9% 15% 7% 1	1680
	21st to end	Day	62% 7% 9% 15% 7%	1680
December	1st to 10th	Day	58% 7% 11% 17% 6% 1	2452
	11th to 20th	Day	59% 6% 16% 14% 4	2688
	21st to end	Day	51% 8% 12% 19% 7% 2	3553
January	1st to 10th	Night	63% 5% 7% 17% 8% 1	8831
	11th to 20th	Night	58% 9% 11% 16% 6% 1	8880
	21st to end	Night	46% 7% 10% 23% 14% 1	9332
February	1st to 10th	Night	53% 8% 10% 16% 11% 2	2730
	11th to 20th	Night	57% 6% 10% 16% 10% 1	2666
	21st to end	Night	54% 6% 9% 17% 12% 2	2249
March	1st to 10th	Night	53% 6% 9% 15% 15% 2	5290
	11th to 20th	Night	65% 4 9% 11% 11% 1	5058
	21st to end	Night	64% 4 8% 13% 9% 3	5360
April	1st to 10th	Night	61% 4 8% 12% 13% 2	2000
	11th to 20th	Night	51% 4 10% 21% 12% 2	1803
	21st to end	Night	54% 5% 11% 15% 15% 1	1742
May	1st to 10th	Night	56% 6% 9% 19% 7% 3	3620
	11th to 20th	Night	48% 5% 14% 25% 8%	3597
	21st to end	Night	52% 5% 12% 21% 9% 1	3547
June	1st to 10th	Night	54% 7% 12% 19% 8% 1	1400
	11th to 20th	Night	48% 7% 15% 20% 8% 1	1400
	21st to end	Night	56% 6% 11% 19% 8% 1	1400
July	1st to 10th	Night	48% 6% 13% 22% 9% 2	3125
	11th to 20th	Night	50% 5% 17% 23% 5%	3118
	21st to end	Night	44% 5% 17% 28% 7%	3476
August	1st to 10th	Night	48% 6% 18% 22% 6%	2606
	11th to 20th	Night	50% 7% 19% 19% 5%	2899
	21st to end	Night	48% 5% 17% 22% 9%	3288
September	1st to 10th	Night	46% 6% 15% 23% 10% 1	2000
	11th to 20th	Night	48% 5% 17% 22% 8%	2026
	21st to end	Night	46% 5% 14% 23% 11%	2291
October	1st to 10th	Night	51% 4 11% 26% 6% 1	3920
	11th to 20th	Night	51% 4 14% 22% 8%	3899
	21st to end	Night	51% 4 10% 23% 11% 1	4630
November	1st to 10th	Night	54% 7% 12% 16% 9% 1	2873
	11th to 20th	Night	63% 6% 11% 13% 6%	2940
	21st to end	Night	64% 6% 11% 12% 6%	2940
December	1st to 10th	Night	60% 5% 10% 16% 8%	4956
	11th to 20th	Night	59% 7% 11% 16% 7%	5742
	21st to end	Night	52% 7% 15% 18% 7%	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	20% 13% 24% 29% 14% 1	220
	11th to 20th	Day	23% 12% 29% 20% 13% 4	220
	21st to end	Day	15% 9% 33% 28% 12% 3	341
February	1st to 10th	Day	16% 9% 36% 25% 11% 3	430
	11th to 20th	Day	17% 8% 31% 28% 14% 1	426
	21st to end	Day	18% 6% 30% 29% 14% 3	355
March	1st to 10th	Day	18% 8% 31% 30% 11% 2	486
	11th to 20th	Day	23% 10% 25% 26% 13% 3	528
	21st to end	Day	25% 10% 25% 26% 12% 2	550
April	1st to 10th	Day	29% 11% 24% 27% 8%	500
	11th to 20th	Day	22% 9% 23% 28% 15% 2	492
	21st to end	Day	30% 6% 21% 27% 12% 4	557
May	1st to 10th	Day	29% 5% 21% 30% 12% 3	703
	11th to 20th	Day	24% 5% 26% 27% 14% 4	724
	21st to end	Day	26% 6% 24% 31% 12% 2	790
June	1st to 10th	Day	28% 3 18% 34% 15% 2	730
	11th to 20th	Day	27% 5% 18% 27% 20% 3	730
	21st to end	Day	27% 5% 21% 29% 16% 3	730
July	1st to 10th	Day	20% 4 18% 36% 19% 3	720
	11th to 20th	Day	22% 4 15% 35% 21% 3	718
	21st to end	Day	27% 4 16% 30% 20% 3	795
August	1st to 10th	Day	17% 3 14% 37% 23% 7%	714
	11th to 20th	Day	20% 3 16% 34% 23% 4	519
	21st to end	Day	19% 4 20% 32% 20% 5%	583
September	1st to 10th	Day	23% 6% 21% 32% 15% 3	530
	11th to 20th	Day	25% 8% 24% 26% 13% 2	530
	21st to end	Day	23% 6% 30% 28% 12% 1	478
October	1st to 10th	Day	22% 5% 30% 28% 12% 2	420
	11th to 20th	Day	29% 6% 29% 20% 12% 3	420
	21st to end	Day	30% 10% 25% 21% 11% 4	462
November	1st to 10th	Day	27% 12% 29% 25% 6% 1	425
	11th to 20th	Day	36% 10% 23% 20% 8% 2	430
	21st to end	Day	34% 11% 25% 21% 7% 1	430
December	1st to 10th	Day	22% 10% 28% 27% 11% 2	283
	11th to 20th	Day	24% 14% 35% 20% 6% 1	220
	21st to end	Day	20% 14% 31% 20% 13% 2	242
January	1st to 10th	Night	23% 9% 32% 26% 9% 1	950
	11th to 20th	Night	22% 11% 31% 25% 9% 1	950
	21st to end	Night	16% 12% 37% 25% 9% 1	1026
February	1st to 10th	Night	15% 12% 35% 27% 11% 2	840
	11th to 20th	Night	21% 8% 31% 29% 10% 2	823
	21st to end	Night	16% 8% 30% 29% 13% 3	692
March	1st to 10th	Night	20% 9% 30% 29% 12% 1	840
	11th to 20th	Night	22% 7% 31% 28% 11% 1	829
	21st to end	Night	22% 8% 30% 29% 8% 2	838
April	1st to 10th	Night	29% 9% 27% 25% 11%	600
	11th to 20th	Night	24% 6% 26% 32% 10% 2	594
	21st to end	Night	26% 6% 23% 29% 14% 2	600
May	1st to 10th	Night	27% 3 17% 34% 16% 3	600
	11th to 20th	Night	24% 4 20% 29% 20% 3	592
	21st to end	Night	27% 3 20% 35% 14% 1	481
June	1st to 10th	Night	29% 3 14% 39% 14% 2	400
	11th to 20th	Night	27% 3 14% 31% 24% 3	400
	21st to end	Night	29% 4 14% 36% 17% 2	400
July	1st to 10th	Night	20% 3 12% 40% 22% 2	390
	11th to 20th	Night	20% 3 12% 45% 19% 2	388
	21st to end	Night	23% 2 13% 36% 23% 2	498
August	1st to 10th	Night	17% 3 16% 31% 27% 4	598
	11th to 20th	Night	21% 3 13% 37% 24% 3	592
	21st to end	Night	18% 3 18% 35% 23% 3	660
September	1st to 10th	Night	25% 6% 20% 32% 15% 2	600
	11th to 20th	Night	26% 6% 21% 35% 12% 1	626
	21st to end	Night	26% 5% 26% 30% 12% 1	800
October	1st to 10th	Night	28% 5% 26% 29% 11% 1	800
	11th to 20th	Night	32% 6% 24% 24% 13% 1	800
	21st to end	Night	29% 7% 24% 27% 12% 1	957
November	1st to 10th	Night	28% 12% 32% 22% 5% 1	930
	11th to 20th	Night	33% 11% 26% 23% 6% 1	950
	21st to end	Night	30% 11% 28% 25% 6%	950
December	1st to 10th	Night	25% 12% 31% 23% 8% 1	950
	11th to 20th	Night	25% 14% 34% 20% 6% 1	950
	21st to end	Night	25% 12% 29% 24% 8% 2	1045

Page generated at 2026-03-15 02:23:55. Version ac07

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