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 2026-10-29.

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% 11% 4 9% 5% 5% 5% 4 5% 7% 31%	150586
	Night	15% 11% 4 9% 5% 5% 5% 4 5% 7% 30%	141781
Transparency	Day	51% 7% 14% 19% 8% 1	154038
	Night	53% 7% 12% 19% 9% 1	146422
Seeing	Day	23% 17% 29% 21% 8% 2	19329
	Night	24% 14% 27% 24% 10% 1	26667

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	9% 19% 7% 13% 7% 7% 5% 4 6% 7% 16%	4093
	11th to 20th	Day	11% 14% 6% 17% 5% 5% 5% 4 6% 7% 17%	4084
	21st to end	Day	3 8% 5% 12% 6% 8% 7% 6% 7% 7% 32%	5214
February	1st to 10th	Day	8% 12% 4 11% 7% 6% 5% 5% 5% 7% 30%	1890
	11th to 20th	Day	9% 16% 5% 12% 8% 4 3 3 6% 6% 27%	1843
	21st to end	Day	9% 12% 5% 10% 7% 5% 5% 4 4 6% 32%	1557
March	1st to 10th	Day	16% 15% 3 10% 5% 5% 5% 3 5% 6% 26%	4872
	11th to 20th	Day	16% 21% 6% 10% 5% 5% 4 3 4 6% 21%	5090
	21st to end	Day	20% 17% 6% 9% 4 4 3 3 4 5% 25%	5587
April	1st to 10th	Day	18% 14% 4 10% 6% 4 4 3 5% 6% 26%	2520
	11th to 20th	Day	17% 13% 4 6% 5% 4 4 3 5% 6% 32%	2691
	21st to end	Day	21% 12% 4 7% 4 4 4 3 4 6% 30%	2730
May	1st to 10th	Day	25% 14% 4 9% 5% 4 4 3 4 5% 24%	8171
	11th to 20th	Day	16% 10% 3 8% 5% 5% 4 3 5% 7% 34%	8220
	21st to end	Day	23% 11% 3 8% 5% 4 4 3 4 5% 30%	9528
June	1st to 10th	Day	21% 10% 3 7% 4 4 4 4 6% 5% 31%	3150
	11th to 20th	Day	19% 8% 2 6% 5% 5% 4 4 6% 8% 33%	3150
	21st to end	Day	23% 10% 3 7% 5% 4 5% 4 6% 6% 27%	3150
July	1st to 10th	Day	12% 7% 3 7% 5% 5% 5% 5% 7% 9% 36%	8880
	11th to 20th	Day	11% 8% 3 8% 6% 6% 6% 5% 7% 8% 32%	8880
	21st to end	Day	12% 7% 2 6% 4 5% 5% 3 6% 9% 41%	9331
August	1st to 10th	Day	14% 7% 3 8% 5% 5% 5% 5% 6% 8% 32%	6188
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 7% 9% 32%	5953
	21st to end	Day	12% 5% 3 6% 4 4 4 4 6% 9% 44%	6527
September	1st to 10th	Day	19% 6% 3 6% 5% 3 3 3 7% 7% 39%	2520
	11th to 20th	Day	19% 6% 2 5% 4 4 4 3 5% 6% 43%	2432
	21st to end	Day	17% 7% 2 5% 5% 5% 5% 3 5% 7% 39%	2252
October	1st to 10th	Day	16% 7% 3 6% 5% 5% 4 4 6% 7% 38%	2100
	11th to 20th	Day	21% 11% 3 8% 5% 3 4 3 5% 6% 31%	2100
	21st to end	Day	23% 11% 4 6% 4 4 4 4 4 7% 28%	2112
November	1st to 10th	Day	17% 14% 3 9% 5% 6% 4 3 5% 7% 26%	1645
	11th to 20th	Day	19% 13% 6% 10% 6% 6% 5% 3 4 6% 23%	1680
	21st to end	Day	19% 16% 5% 11% 6% 5% 4 3 5% 5% 22%	1680
December	1st to 10th	Day	12% 15% 6% 12% 5% 4 5% 3 5% 5% 28%	2525
	11th to 20th	Day	14% 15% 4 10% 7% 5% 5% 3 5% 6% 25%	2688
	21st to end	Day	14% 12% 5% 15% 7% 5% 5% 4 5% 5% 23%	3553
January	1st to 10th	Night	11% 17% 6% 14% 8% 7% 5% 4 5% 6% 17%	8831
	11th to 20th	Night	12% 13% 5% 15% 6% 5% 5% 4 6% 7% 21%	8831
	21st to end	Night	3 7% 5% 11% 6% 8% 6% 5% 8% 9% 32%	8964
February	1st to 10th	Night	9% 13% 4 10% 6% 5% 6% 4 6% 6% 32%	2730
	11th to 20th	Night	12% 16% 4 11% 6% 5% 4 4 5% 6% 27%	2663
	21st to end	Night	11% 14% 4 7% 6% 5% 4 4 6% 6% 32%	2249
March	1st to 10th	Night	16% 15% 4 9% 6% 6% 5% 3 4 6% 28%	5185
	11th to 20th	Night	20% 17% 4 10% 6% 5% 5% 3 4 5% 20%	5089
	21st to end	Night	23% 14% 5% 10% 5% 4 4 3 4 6% 23%	5587
April	1st to 10th	Night	21% 12% 3 9% 5% 4 5% 4 5% 6% 26%	2100
	11th to 20th	Night	20% 10% 3 7% 4 4 4 4 5% 6% 33%	1875
	21st to end	Night	22% 10% 4 7% 4 3 3 3 5% 5% 34%	1890
May	1st to 10th	Night	25% 12% 3 6% 4 5% 4 3 4 5% 30%	4754
	11th to 20th	Night	18% 8% 3 6% 4 4 4 3 5% 7% 37%	4670
	21st to end	Night	19% 9% 4 8% 5% 5% 4 4 5% 6% 31%	4734
June	1st to 10th	Night	23% 8% 2 7% 4 4 4 4 5% 7% 31%	1470
	11th to 20th	Night	20% 7% 2 7% 5% 4 4 3 5% 7% 36%	1470
	21st to end	Night	21% 7% 3 7% 4 5% 5% 5% 6% 6% 31%	1470
July	1st to 10th	Night	13% 7% 2 7% 5% 4 5% 4 7% 7% 38%	4110
	11th to 20th	Night	12% 6% 2 5% 5% 5% 5% 5% 7% 10% 38%	4110
	21st to end	Night	8% 6% 3 7% 4 5% 5% 4 6% 8% 45%	4720
August	1st to 10th	Night	13% 8% 2 7% 4 5% 5% 4 6% 7% 39%	3954
	11th to 20th	Night	11% 7% 2 6% 4 4 4 4 6% 10% 40%	4092
	21st to end	Night	13% 5% 2 5% 4 3 4 4 5% 8% 47%	4596
September	1st to 10th	Night	18% 6% 2 5% 3 4 4 3 5% 6% 44%	2100
	11th to 20th	Night	17% 6% 2 5% 3 4 4 3 5% 6% 46%	2184
	21st to end	Night	18% 6% 2 5% 3 4 3 2 5% 6% 46%	2368
October	1st to 10th	Night	17% 7% 3 6% 4 4 4 3 5% 6% 41%	2520
	11th to 20th	Night	21% 9% 2 7% 4 4 4 3 4 6% 36%	2520
	21st to end	Night	20% 10% 3 6% 4 4 4 3 5% 7% 34%	2900
November	1st to 10th	Night	19% 12% 3 8% 5% 4 4 4 4 6% 32%	2873
	11th to 20th	Night	21% 13% 5% 9% 5% 4 4 4 6% 6% 24%	2940
	21st to end	Night	21% 15% 5% 11% 5% 4 4 4 5% 5% 21%	2940
December	1st to 10th	Night	13% 13% 4 13% 6% 5% 5% 4 5% 6% 27%	4884
	11th to 20th	Night	15% 16% 4 12% 6% 4 4 4 5% 6% 24%	5741
	21st to end	Night	17% 14% 4 13% 8% 4 5% 3 5% 6% 19%	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	64% 12% 12% 10% 2	4094
	11th to 20th	Day	62% 8% 13% 10% 6%	4110
	21st to end	Day	47% 7% 15% 17% 14%	5214
February	1st to 10th	Day	51% 8% 12% 18% 10% 2	1890
	11th to 20th	Day	57% 7% 12% 16% 8% 1	1851
	21st to end	Day	51% 8% 8% 22% 10% 2	1557
March	1st to 10th	Day	58% 7% 11% 14% 9% 1	4876
	11th to 20th	Day	64% 7% 8% 12% 6% 3	5090
	21st to end	Day	61% 4 9% 17% 8% 1	5587
April	1st to 10th	Day	58% 5% 9% 15% 12% 1	2520
	11th to 20th	Day	51% 6% 10% 20% 12% 1	2691
	21st to end	Day	53% 6% 13% 15% 12% 1	2730
May	1st to 10th	Day	62% 5% 11% 15% 7% 1	8184
	11th to 20th	Day	48% 6% 15% 22% 9% 1	8224
	21st to end	Day	54% 6% 10% 18% 11%	9529
June	1st to 10th	Day	52% 7% 12% 18% 10%	3150
	11th to 20th	Day	47% 7% 15% 20% 9% 1	3150
	21st to end	Day	55% 8% 12% 17% 7%	3150
July	1st to 10th	Day	41% 7% 15% 26% 10%	8805
	11th to 20th	Day	47% 7% 18% 23% 5%	8799
	21st to end	Day	39% 6% 19% 27% 8%	9125
August	1st to 10th	Day	47% 8% 19% 21% 5%	6174
	11th to 20th	Day	46% 8% 22% 20% 4	5992
	21st to end	Day	36% 7% 19% 26% 11% 1	6527
September	1st to 10th	Day	43% 8% 16% 24% 9%	2520
	11th to 20th	Day	43% 5% 15% 26% 9%	2432
	21st to end	Day	44% 7% 12% 25% 12% 1	2252
October	1st to 10th	Day	47% 6% 14% 26% 6% 1	3360
	11th to 20th	Day	54% 6% 12% 21% 6% 1	3340
	21st to end	Day	49% 6% 14% 19% 10% 1	3344
November	1st to 10th	Day	57% 7% 13% 14% 8%	1645
	11th to 20th	Day	62% 6% 13% 13% 6%	1680
	21st to end	Day	64% 7% 12% 11% 6%	1680
December	1st to 10th	Day	58% 8% 9% 18% 7%	2525
	11th to 20th	Day	60% 6% 11% 13% 9%	2688
	21st to end	Day	61% 10% 11% 13% 3 1	3553
January	1st to 10th	Night	66% 10% 10% 12% 2	8831
	11th to 20th	Night	60% 9% 11% 13% 7%	8880
	21st to end	Night	45% 10% 14% 16% 15% 1	8964
February	1st to 10th	Night	52% 6% 10% 18% 11% 2	2730
	11th to 20th	Night	57% 8% 9% 17% 9% 1	2666
	21st to end	Night	50% 6% 9% 22% 12% 1	2249
March	1st to 10th	Night	58% 6% 8% 17% 10% 1	5194
	11th to 20th	Night	65% 6% 9% 12% 6% 1	5090
	21st to end	Night	63% 4 7% 16% 9% 1	5587
April	1st to 10th	Night	56% 7% 10% 13% 13% 1	2100
	11th to 20th	Night	51% 5% 9% 23% 11% 1	1875
	21st to end	Night	52% 5% 11% 15% 15% 2	1890
May	1st to 10th	Night	55% 7% 9% 19% 8% 2	4759
	11th to 20th	Night	46% 6% 10% 24% 13% 1	4671
	21st to end	Night	51% 7% 9% 19% 14%	4735
June	1st to 10th	Night	52% 7% 12% 18% 10%	1470
	11th to 20th	Night	49% 6% 14% 18% 13% 1	1470
	21st to end	Night	52% 9% 12% 19% 8% 1	1470
July	1st to 10th	Night	43% 7% 15% 23% 12%	4075
	11th to 20th	Night	40% 7% 18% 32% 4	4068
	21st to end	Night	38% 7% 21% 25% 9%	4612
August	1st to 10th	Night	45% 8% 17% 23% 8%	3943
	11th to 20th	Night	40% 7% 24% 23% 5%	4119
	21st to end	Night	35% 7% 18% 30% 11%	4595
September	1st to 10th	Night	41% 7% 13% 28% 9% 1	2100
	11th to 20th	Night	40% 6% 15% 26% 13%	2184
	21st to end	Night	40% 6% 11% 27% 16%	2368
October	1st to 10th	Night	49% 5% 11% 27% 7% 1	4040
	11th to 20th	Night	46% 6% 11% 27% 10% 1	4019
	21st to end	Night	49% 7% 13% 23% 8% 1	4622
November	1st to 10th	Night	53% 8% 14% 18% 7% 1	2873
	11th to 20th	Night	59% 8% 12% 14% 6% 1	2940
	21st to end	Night	64% 9% 11% 11% 4	2940
December	1st to 10th	Night	58% 8% 10% 18% 7%	4884
	11th to 20th	Night	60% 7% 10% 16% 7% 1	5742
	21st to end	Night	65% 7% 12% 13% 2	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	31% 16% 27% 20% 5%	220
	11th to 20th	Day	31% 20% 26% 15% 5% 2	220
	21st to end	Day	15% 22% 34% 21% 6% 2	363
February	1st to 10th	Day	20% 22% 30% 18% 9% 2	430
	11th to 20th	Day	20% 25% 31% 18% 5% 1	426
	21st to end	Day	17% 21% 30% 23% 8% 1	355
March	1st to 10th	Day	21% 25% 34% 15% 5% 1	521
	11th to 20th	Day	23% 23% 28% 19% 6% 1	540
	21st to end	Day	27% 22% 30% 14% 4 2	594
April	1st to 10th	Day	28% 28% 25% 15% 3 1	540
	11th to 20th	Day	26% 21% 32% 15% 4 1	532
	21st to end	Day	26% 18% 26% 22% 5% 2	540
May	1st to 10th	Day	30% 15% 28% 18% 7% 2	727
	11th to 20th	Day	24% 15% 28% 21% 9% 2	774
	21st to end	Day	26% 19% 28% 19% 6% 1	845
June	1st to 10th	Day	26% 15% 28% 22% 8% 2	780
	11th to 20th	Day	23% 12% 28% 24% 11% 2	780
	21st to end	Day	25% 12% 29% 21% 9% 2	780
July	1st to 10th	Day	18% 8% 34% 28% 10% 2	770
	11th to 20th	Day	13% 11% 32% 30% 12% 2	768
	21st to end	Day	18% 9% 24% 33% 13% 3	850
August	1st to 10th	Day	16% 7% 25% 33% 16% 2	648
	11th to 20th	Day	16% 6% 29% 29% 16% 3	559
	21st to end	Day	15% 11% 32% 28% 11% 3	627
September	1st to 10th	Day	20% 14% 34% 20% 10% 3	570
	11th to 20th	Day	23% 17% 28% 20% 9% 2	570
	21st to end	Day	20% 20% 27% 22% 9% 1	537
October	1st to 10th	Day	17% 20% 29% 22% 9% 2	450
	11th to 20th	Day	27% 20% 25% 18% 8% 2	450
	21st to end	Day	27% 19% 28% 17% 7% 1	486
November	1st to 10th	Day	27% 21% 28% 19% 5% 1	425
	11th to 20th	Day	29% 20% 28% 15% 7% 2	430
	21st to end	Day	33% 20% 28% 17% 3	430
December	1st to 10th	Day	24% 17% 36% 18% 4 1	330
	11th to 20th	Day	29% 25% 29% 13% 4	220
	21st to end	Day	23% 26% 29% 14% 7% 1	242
January	1st to 10th	Night	26% 18% 30% 19% 6% 1	950
	11th to 20th	Night	22% 20% 30% 21% 7%	950
	21st to end	Night	17% 21% 32% 21% 8% 1	972
February	1st to 10th	Night	19% 17% 32% 25% 6% 1	840
	11th to 20th	Night	25% 16% 33% 20% 6% 1	823
	21st to end	Night	20% 18% 29% 22% 8% 2	692
March	1st to 10th	Night	22% 18% 31% 22% 7% 1	840
	11th to 20th	Night	24% 18% 29% 22% 7% 1	840
	21st to end	Night	26% 17% 26% 22% 8% 1	924
April	1st to 10th	Night	29% 13% 30% 22% 6% 1	630
	11th to 20th	Night	25% 12% 30% 23% 8% 1	624
	21st to end	Night	28% 10% 26% 25% 10% 2	630
May	1st to 10th	Night	28% 9% 20% 29% 12% 2	630
	11th to 20th	Night	23% 9% 24% 29% 14% 2	622
	21st to end	Night	22% 12% 26% 30% 9% 1	542
June	1st to 10th	Night	28% 6% 22% 29% 14% 1	420
	11th to 20th	Night	25% 6% 20% 30% 15% 3	420
	21st to end	Night	23% 5% 21% 34% 15% 2	420
July	1st to 10th	Night	18% 5% 17% 40% 18% 2	410
	11th to 20th	Night	18% 6% 18% 39% 17% 1	408
	21st to end	Night	16% 6% 20% 37% 19% 2	549
August	1st to 10th	Night	18% 4 15% 39% 22% 2	628
	11th to 20th	Night	18% 3 20% 35% 23% 2	622
	21st to end	Night	16% 5% 24% 31% 21% 2	693
September	1st to 10th	Night	21% 10% 25% 28% 15% 1	630
	11th to 20th	Night	20% 10% 26% 28% 15% 1	714
	21st to end	Night	22% 11% 27% 28% 12%	840
October	1st to 10th	Night	21% 16% 28% 24% 11% 1	840
	11th to 20th	Night	25% 16% 24% 24% 10% 1	840
	21st to end	Night	25% 17% 26% 23% 8%	949
November	1st to 10th	Night	27% 19% 28% 21% 5% 1	930
	11th to 20th	Night	31% 17% 29% 17% 6% 2	950
	21st to end	Night	30% 19% 26% 19% 4 1	950
December	1st to 10th	Night	27% 19% 33% 16% 5% 1	950
	11th to 20th	Night	27% 25% 29% 15% 4	950
	21st to end	Night	28% 20% 26% 20% 6% 1	1045

Page generated at 2026-10-26 04:37:48. Version ac07

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