Gaspé
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gaspé clear sky chart from 2005-11-06 to 2025-07-06.

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	17% 11% 4 9% 5% 5% 5% 4 5% 7% 30%	119926
	Night	16% 11% 4 9% 5% 5% 4 4 5% 6% 30%	119042
Transparency	Day	52% 7% 13% 19% 8% 1	123423
	Night	54% 8% 12% 18% 8% 1	123710
Seeing	Day	23% 17% 29% 21% 8% 2	17522
	Night	24% 15% 27% 24% 10% 1	24986

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	11% 20% 7% 13% 8% 6% 6% 4 6% 7% 14%	3157
	11th to 20th	Day	8% 14% 7% 19% 5% 6% 5% 5% 6% 7% 17%	3134
	21st to end	Day	4 6% 3 10% 5% 8% 6% 5% 8% 8% 36%	4020
February	1st to 10th	Day	9% 12% 4 10% 7% 6% 5% 5% 6% 7% 30%	1800
	11th to 20th	Day	10% 16% 4 11% 8% 4 3 3 6% 6% 28%	1753
	21st to end	Day	9% 12% 5% 10% 7% 5% 5% 4 4 6% 32%	1485
March	1st to 10th	Day	16% 16% 3 10% 5% 5% 5% 3 4 5% 26%	4766
	11th to 20th	Day	16% 21% 5% 10% 5% 5% 4 3 4 6% 21%	4980
	21st to end	Day	21% 17% 6% 9% 4 4 3 3 4 5% 25%	5466
April	1st to 10th	Day	18% 14% 4 10% 6% 4 4 3 5% 6% 26%	2400
	11th to 20th	Day	17% 13% 4 6% 5% 4 4 3 5% 6% 32%	2562
	21st to end	Day	23% 13% 4 7% 4 4 4 3 4 6% 29%	2600
May	1st to 10th	Day	23% 14% 4 8% 5% 4 4 3 4 5% 27%	6294
	11th to 20th	Day	17% 10% 3 8% 4 4 4 3 5% 6% 34%	6318
	21st to end	Day	22% 11% 3 7% 4 4 4 3 5% 6% 31%	7305
June	1st to 10th	Day	22% 11% 3 7% 4 4 4 4 6% 5% 31%	3000
	11th to 20th	Day	18% 8% 2 6% 5% 5% 4 4 6% 8% 35%	3000
	21st to end	Day	24% 10% 3 7% 5% 4 5% 4 6% 6% 26%	3000
July	1st to 10th	Day	15% 6% 2 6% 5% 5% 5% 4 7% 8% 37%	4835
	11th to 20th	Day	12% 7% 2 7% 6% 6% 6% 5% 8% 8% 33%	4760
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	4987
August	1st to 10th	Day	16% 7% 3 7% 5% 5% 5% 5% 7% 8% 31%	4218
	11th to 20th	Day	16% 6% 3 7% 5% 5% 6% 5% 7% 9% 31%	4045
	21st to end	Day	13% 5% 2 5% 4 4 4 3 5% 8% 46%	4481
September	1st to 10th	Day	20% 5% 3 6% 5% 4 3 4 6% 6% 39%	2280
	11th to 20th	Day	20% 6% 2 5% 4 3 3 3 4 5% 44%	2200
	21st to end	Day	19% 7% 2 5% 5% 5% 5% 3 5% 7% 37%	2038
October	1st to 10th	Day	16% 7% 3 6% 5% 5% 4 4 6% 6% 37%	1900
	11th to 20th	Day	22% 11% 3 8% 5% 3 3 3 5% 6% 30%	1900
	21st to end	Day	24% 12% 4 6% 4 4 4 3 4 7% 27%	1933
November	1st to 10th	Day	17% 14% 3 9% 5% 6% 4 3 5% 7% 26%	1565
	11th to 20th	Day	20% 13% 6% 9% 6% 6% 6% 3 4 6% 23%	1600
	21st to end	Day	20% 16% 5% 11% 6% 5% 4 3 4 5% 22%	1600
December	1st to 10th	Day	13% 15% 5% 12% 5% 4 6% 3 5% 5% 27%	2450
	11th to 20th	Day	15% 15% 5% 10% 7% 5% 5% 3 5% 6% 24%	2618
	21st to end	Day	14% 13% 5% 15% 7% 5% 5% 4 5% 5% 23%	3476
January	1st to 10th	Night	11% 17% 7% 16% 9% 7% 5% 4 5% 6% 14%	6808
	11th to 20th	Night	12% 13% 5% 18% 6% 5% 5% 4 6% 7% 19%	6771
	21st to end	Night	4 7% 3 10% 6% 8% 5% 5% 7% 8% 35%	6930
February	1st to 10th	Night	10% 14% 4 9% 6% 5% 6% 4 6% 6% 32%	2600
	11th to 20th	Night	13% 15% 4 10% 6% 5% 4 4 5% 6% 27%	2533
	21st to end	Night	11% 14% 4 7% 6% 5% 5% 4 6% 6% 32%	2145
March	1st to 10th	Night	16% 15% 4 9% 6% 6% 5% 3 4 5% 28%	5071
	11th to 20th	Night	20% 17% 4 10% 6% 5% 5% 3 4 5% 20%	4979
	21st to end	Night	23% 14% 5% 10% 5% 4 3 3 4 6% 23%	5466
April	1st to 10th	Night	21% 12% 3 9% 5% 4 5% 4 5% 7% 26%	2000
	11th to 20th	Night	20% 10% 3 7% 4 4 4 3 5% 6% 33%	1785
	21st to end	Night	23% 11% 4 7% 4 3 3 3 5% 5% 33%	1800
May	1st to 10th	Night	22% 12% 3 6% 4 5% 4 3 4 5% 31%	3664
	11th to 20th	Night	19% 8% 3 6% 5% 4 4 3 5% 6% 37%	3596
	21st to end	Night	16% 8% 4 9% 5% 5% 5% 4 6% 7% 31%	3633
June	1st to 10th	Night	24% 8% 2 7% 4 4 4 3 5% 7% 31%	1400
	11th to 20th	Night	19% 7% 2 7% 5% 4 4 3 5% 7% 38%	1400
	21st to end	Night	22% 7% 3 7% 4 5% 5% 5% 6% 6% 31%	1400
July	1st to 10th	Night	14% 7% 2 6% 4 4 4 4 6% 7% 41%	2245
	11th to 20th	Night	13% 6% 2 6% 5% 3 5% 5% 6% 9% 40%	2210
	21st to end	Night	11% 5% 2 6% 4 4 4 4 6% 8% 47%	2546
August	1st to 10th	Night	14% 8% 2 7% 5% 5% 5% 4 5% 6% 38%	2700
	11th to 20th	Night	14% 6% 2 6% 4 4 5% 4 6% 9% 39%	2782
	21st to end	Night	14% 6% 2 5% 4 3 3 4 5% 7% 47%	3174
September	1st to 10th	Night	18% 6% 2 5% 4 4 4 3 5% 6% 43%	1900
	11th to 20th	Night	18% 6% 2 5% 3 4 3 3 5% 5% 46%	1976
	21st to end	Night	19% 7% 2 5% 4 4 4 2 4 6% 44%	2142
October	1st to 10th	Night	19% 7% 3 6% 4 4 4 3 5% 6% 40%	2280
	11th to 20th	Night	22% 10% 2 7% 4 4 4 4 4 6% 34%	2280
	21st to end	Night	21% 10% 3 6% 4 4 4 3 5% 7% 33%	2661
November	1st to 10th	Night	20% 12% 3 8% 5% 4 4 4 4 5% 32%	2733
	11th to 20th	Night	20% 13% 5% 9% 5% 4 4 4 6% 6% 24%	2800
	21st to end	Night	21% 15% 5% 11% 5% 4 4 4 5% 5% 21%	2800
December	1st to 10th	Night	13% 13% 4 13% 6% 5% 5% 4 5% 6% 27%	4739
	11th to 20th	Night	15% 16% 4 11% 6% 4 4 4 5% 6% 24%	5591
	21st to end	Night	17% 14% 4 13% 8% 4 4 3 5% 6% 20%	7502

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	65% 15% 10% 7% 2	3158
	11th to 20th	Day	62% 10% 14% 11% 4	3160
	21st to end	Day	41% 8% 16% 19% 15% 1	4020
February	1st to 10th	Day	50% 8% 12% 18% 10% 2	1800
	11th to 20th	Day	56% 7% 12% 16% 9% 1	1761
	21st to end	Day	51% 8% 8% 22% 9% 2	1485
March	1st to 10th	Day	59% 7% 11% 14% 8% 1	4770
	11th to 20th	Day	64% 7% 8% 12% 6% 3	4980
	21st to end	Day	62% 4 9% 17% 7% 1	5466
April	1st to 10th	Day	58% 6% 9% 15% 12% 1	2400
	11th to 20th	Day	51% 6% 10% 20% 12% 1	2562
	21st to end	Day	54% 7% 12% 14% 11% 1	2600
May	1st to 10th	Day	58% 6% 10% 17% 8% 1	6306
	11th to 20th	Day	50% 6% 15% 21% 7% 1	6322
	21st to end	Day	51% 7% 13% 20% 9% 1	7305
June	1st to 10th	Day	53% 8% 12% 18% 10% 1	3000
	11th to 20th	Day	46% 7% 14% 21% 10% 1	3000
	21st to end	Day	56% 8% 12% 16% 8%	3000
July	1st to 10th	Day	42% 8% 15% 24% 10%	4760
	11th to 20th	Day	45% 8% 19% 22% 7%	4679
	21st to end	Day	40% 9% 20% 22% 10%	4828
August	1st to 10th	Day	47% 9% 20% 20% 5%	4204
	11th to 20th	Day	45% 9% 20% 20% 5% 1	4084
	21st to end	Day	35% 6% 17% 28% 12% 1	4481
September	1st to 10th	Day	43% 8% 16% 23% 10%	2280
	11th to 20th	Day	43% 6% 15% 27% 9%	2200
	21st to end	Day	46% 7% 12% 24% 10% 1	2038
October	1st to 10th	Day	47% 6% 14% 25% 6% 1	3160
	11th to 20th	Day	55% 6% 12% 22% 5% 1	3140
	21st to end	Day	49% 6% 14% 19% 10% 1	3165
November	1st to 10th	Day	57% 7% 13% 14% 8%	1565
	11th to 20th	Day	62% 6% 14% 12% 6%	1600
	21st to end	Day	64% 7% 12% 11% 5%	1600
December	1st to 10th	Day	58% 8% 9% 18% 7%	2450
	11th to 20th	Day	61% 6% 10% 13% 10%	2618
	21st to end	Day	61% 11% 11% 14% 3 1	3476
January	1st to 10th	Night	69% 11% 9% 9% 2	6808
	11th to 20th	Night	62% 10% 11% 12% 5%	6820
	21st to end	Night	42% 11% 13% 16% 16% 2	6930
February	1st to 10th	Night	52% 6% 10% 18% 11% 2	2600
	11th to 20th	Night	56% 8% 9% 17% 10% 1	2536
	21st to end	Night	50% 6% 9% 22% 12% 1	2145
March	1st to 10th	Night	58% 6% 8% 17% 10% 1	5080
	11th to 20th	Night	65% 6% 9% 12% 6% 1	4980
	21st to end	Night	63% 4 7% 16% 9% 1	5466
April	1st to 10th	Night	56% 7% 10% 13% 13% 1	2000
	11th to 20th	Night	51% 5% 9% 23% 11% 1	1785
	21st to end	Night	53% 5% 11% 15% 14% 2	1800
May	1st to 10th	Night	53% 8% 10% 17% 9% 3	3669
	11th to 20th	Night	47% 7% 10% 24% 12%	3597
	21st to end	Night	49% 8% 11% 20% 10% 1	3634
June	1st to 10th	Night	52% 7% 12% 18% 10%	1400
	11th to 20th	Night	47% 6% 14% 18% 14% 1	1400
	21st to end	Night	52% 9% 11% 19% 8% 1	1400
July	1st to 10th	Night	41% 8% 16% 20% 14%	2210
	11th to 20th	Night	41% 7% 18% 29% 5%	2168
	21st to end	Night	35% 10% 22% 23% 11%	2465
August	1st to 10th	Night	47% 7% 17% 22% 7%	2689
	11th to 20th	Night	41% 8% 20% 23% 6%	2809
	21st to end	Night	35% 8% 16% 29% 13%	3173
September	1st to 10th	Night	42% 8% 13% 27% 10% 1	1900
	11th to 20th	Night	41% 6% 14% 27% 12%	1976
	21st to end	Night	41% 6% 12% 27% 13% 1	2142
October	1st to 10th	Night	50% 5% 11% 27% 7% 1	3800
	11th to 20th	Night	46% 6% 10% 27% 10%	3779
	21st to end	Night	49% 7% 13% 23% 8% 1	4383
November	1st to 10th	Night	53% 8% 14% 18% 7% 1	2733
	11th to 20th	Night	59% 8% 12% 14% 6% 1	2800
	21st to end	Night	65% 9% 11% 11% 4	2800
December	1st to 10th	Night	58% 8% 10% 18% 7%	4739
	11th to 20th	Night	60% 7% 10% 16% 7% 1	5592
	21st to end	Night	65% 8% 12% 14% 2	7502

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	33% 18% 28% 19% 3 1	200
	11th to 20th	Day	31% 19% 28% 15% 6% 3	200
	21st to end	Day	15% 22% 33% 21% 7% 2	335
February	1st to 10th	Day	21% 22% 31% 17% 7% 2	400
	11th to 20th	Day	20% 26% 32% 17% 4 1	396
	21st to end	Day	17% 21% 31% 22% 8% 1	331
March	1st to 10th	Day	22% 23% 34% 15% 5% 1	483
	11th to 20th	Day	21% 23% 29% 20% 6% 1	500
	21st to end	Day	29% 22% 29% 15% 4 2	550
April	1st to 10th	Day	29% 28% 25% 15% 3 1	500
	11th to 20th	Day	26% 19% 33% 16% 5% 1	492
	21st to end	Day	28% 19% 26% 21% 5% 2	500
May	1st to 10th	Day	28% 15% 28% 19% 7% 2	678
	11th to 20th	Day	25% 15% 27% 21% 9% 2	724
	21st to end	Day	26% 19% 29% 19% 6% 1	790
June	1st to 10th	Day	27% 15% 28% 21% 7% 2	730
	11th to 20th	Day	21% 12% 29% 24% 11% 2	730
	21st to end	Day	25% 13% 30% 21% 9% 1	730
July	1st to 10th	Day	18% 8% 35% 28% 10% 2	695
	11th to 20th	Day	13% 11% 33% 29% 12% 2	668
	21st to end	Day	18% 9% 24% 33% 13% 3	740
August	1st to 10th	Day	18% 7% 26% 31% 17% 2	560
	11th to 20th	Day	16% 6% 32% 27% 15% 3	479
	21st to end	Day	16% 12% 31% 27% 11% 3	539
September	1st to 10th	Day	20% 14% 35% 20% 9% 2	490
	11th to 20th	Day	24% 17% 28% 20% 9% 3	490
	21st to end	Day	23% 21% 28% 19% 8% 1	463
October	1st to 10th	Day	17% 21% 28% 21% 9% 3	390
	11th to 20th	Day	27% 20% 26% 17% 7% 2	390
	21st to end	Day	29% 20% 28% 16% 7% 1	429
November	1st to 10th	Day	27% 20% 28% 19% 5% 1	395
	11th to 20th	Day	30% 20% 28% 15% 6% 2	400
	21st to end	Day	33% 21% 28% 17% 2	400
December	1st to 10th	Day	25% 16% 35% 19% 4 1	305
	11th to 20th	Day	30% 26% 28% 12% 4 1	200
	21st to end	Day	24% 26% 29% 14% 6%	220
January	1st to 10th	Night	25% 18% 30% 19% 6% 1	900
	11th to 20th	Night	23% 20% 30% 20% 7%	900
	21st to end	Night	18% 20% 32% 21% 8% 1	924
February	1st to 10th	Night	20% 18% 32% 24% 6% 1	800
	11th to 20th	Night	25% 16% 34% 19% 5% 1	783
	21st to end	Night	20% 18% 29% 22% 9% 2	660
March	1st to 10th	Night	22% 18% 31% 22% 7% 1	800
	11th to 20th	Night	23% 17% 29% 21% 7% 1	800
	21st to end	Night	27% 16% 26% 22% 8% 1	880
April	1st to 10th	Night	30% 13% 29% 21% 6% 1	600
	11th to 20th	Night	25% 12% 30% 24% 8% 1	594
	21st to end	Night	29% 10% 26% 25% 9% 2	600
May	1st to 10th	Night	28% 9% 20% 29% 12% 2	600
	11th to 20th	Night	23% 9% 24% 28% 14% 2	592
	21st to end	Night	21% 12% 27% 30% 9% 2	516
June	1st to 10th	Night	29% 7% 22% 29% 14% 1	400
	11th to 20th	Night	24% 7% 21% 32% 15% 3	400
	21st to end	Night	23% 5% 22% 34% 15% 1	400
July	1st to 10th	Night	18% 4 18% 39% 18% 2	380
	11th to 20th	Night	19% 6% 18% 38% 18% 1	368
	21st to end	Night	16% 6% 20% 37% 19% 2	497
August	1st to 10th	Night	19% 4 16% 40% 19% 1	568
	11th to 20th	Night	19% 3 20% 34% 22% 1	562
	21st to end	Night	17% 6% 24% 31% 20% 2	627
September	1st to 10th	Night	21% 10% 26% 29% 13% 1	570
	11th to 20th	Night	21% 10% 25% 28% 15% 1	646
	21st to end	Night	23% 11% 28% 27% 11% 1	760
October	1st to 10th	Night	22% 16% 26% 24% 11% 1	760
	11th to 20th	Night	26% 17% 23% 23% 10% 1	760
	21st to end	Night	26% 16% 27% 23% 8%	869
November	1st to 10th	Night	27% 18% 28% 21% 5% 1	880
	11th to 20th	Night	30% 17% 28% 17% 6% 2	900
	21st to end	Night	31% 20% 26% 18% 4 1	900
December	1st to 10th	Night	28% 19% 32% 16% 5% 1	900
	11th to 20th	Night	28% 25% 28% 14% 5%	900
	21st to end	Night	28% 20% 25% 20% 6% 1	990

Page generated at 2025-07-03 01:30:11. Version ac07

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