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 2024-03-18.

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	17% 10% 4 7% 6% 4 5% 5% 5% 7% 30%	78147
	Night	17% 10% 4 8% 6% 4 5% 5% 5% 6% 30%	81662
Transparency	Day	52% 8% 13% 17% 8% 1	77835
	Night	53% 9% 12% 17% 8% 1	81509
Seeing	Day	23% 17% 30% 21% 8% 2	15671
	Night	24% 15% 27% 24% 9% 1	23371

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	13% 13% 4 8% 11% 5% 6% 6% 7% 8% 19%	2207
	11th to 20th	Day	9% 11% 5% 10% 6% 6% 6% 8% 8% 9% 22%	2210
	21st to end	Day	6% 8% 4 10% 8% 8% 6% 5% 6% 8% 30%	2800
February	1st to 10th	Day	9% 12% 5% 9% 8% 4 5% 6% 5% 7% 31%	1710
	11th to 20th	Day	10% 16% 5% 10% 9% 3 4 4 5% 6% 27%	1663
	21st to end	Day	9% 11% 5% 9% 7% 4 5% 6% 4 7% 32%	1413
March	1st to 10th	Day	14% 13% 6% 7% 6% 4 4 4 5% 6% 31%	2011
	11th to 20th	Day	13% 14% 5% 8% 7% 4 5% 5% 5% 7% 27%	2059
	21st to end	Day	15% 15% 4 7% 5% 4 5% 4 4 5% 32%	2178
April	1st to 10th	Day	19% 12% 5% 8% 7% 3 4 4 5% 6% 26%	2160
	11th to 20th	Day	17% 12% 4 5% 5% 4 4 4 5% 6% 33%	2302
	21st to end	Day	23% 11% 4 7% 5% 3 4 5% 4 6% 29%	2340
May	1st to 10th	Day	24% 11% 4 6% 5% 2 4 4 4 5% 31%	2497
	11th to 20th	Day	20% 10% 3 5% 5% 3 4 4 4 6% 34%	2478
	21st to end	Day	19% 10% 3 6% 5% 4 4 5% 5% 7% 32%	2857
June	1st to 10th	Day	23% 10% 3 7% 5% 3 4 5% 5% 6% 29%	2700
	11th to 20th	Day	20% 7% 3 5% 5% 3 4 5% 5% 8% 35%	2700
	21st to end	Day	25% 9% 3 6% 6% 3 5% 5% 6% 6% 26%	2700
July	1st to 10th	Day	19% 6% 3 6% 6% 4 5% 5% 7% 8% 32%	2700
	11th to 20th	Day	14% 6% 3 6% 6% 4 6% 6% 6% 8% 35%	2700
	21st to end	Day	18% 7% 3 6% 6% 4 5% 5% 6% 8% 31%	2847
August	1st to 10th	Day	17% 6% 2 5% 5% 3 6% 6% 7% 8% 33%	2398
	11th to 20th	Day	17% 6% 3 5% 6% 3 6% 6% 7% 8% 33%	2304
	21st to end	Day	16% 6% 3 6% 6% 4 5% 5% 6% 8% 35%	2551
September	1st to 10th	Day	20% 5% 3 5% 5% 3 3 4 6% 7% 39%	2160
	11th to 20th	Day	21% 6% 2 5% 4 3 3 3 4 5% 43%	2085
	21st to end	Day	19% 7% 2 4 6% 4 4 5% 5% 7% 38%	1931
October	1st to 10th	Day	16% 7% 3 6% 6% 3 5% 5% 6% 7% 38%	1800
	11th to 20th	Day	23% 11% 3 6% 6% 2 3 4 5% 6% 30%	1800
	21st to end	Day	26% 12% 4 5% 5% 3 5% 4 5% 6% 25%	1832
November	1st to 10th	Day	17% 12% 4 8% 6% 5% 5% 4 5% 7% 27%	1485
	11th to 20th	Day	19% 12% 6% 8% 7% 4 6% 4 4 6% 23%	1520
	21st to end	Day	19% 15% 5% 10% 7% 4 5% 4 5% 5% 22%	1520
December	1st to 10th	Day	19% 13% 5% 11% 7% 3 6% 4 5% 7% 21%	1430
	11th to 20th	Day	13% 14% 6% 12% 11% 5% 6% 4 6% 6% 18%	1668
	21st to end	Day	15% 12% 5% 12% 8% 4 6% 6% 6% 5% 22%	2431
January	1st to 10th	Night	10% 12% 5% 13% 12% 6% 5% 6% 6% 8% 18%	4748
	11th to 20th	Night	15% 12% 5% 8% 7% 4 5% 6% 7% 8% 23%	4760
	21st to end	Night	7% 9% 4 8% 7% 7% 6% 5% 7% 8% 32%	4846
February	1st to 10th	Night	10% 13% 4 8% 6% 3 6% 5% 6% 6% 33%	2470
	11th to 20th	Night	13% 14% 5% 9% 8% 4 4 5% 5% 7% 27%	2403
	21st to end	Night	11% 13% 5% 7% 6% 4 5% 5% 6% 7% 32%	2041
March	1st to 10th	Night	14% 13% 4 7% 6% 5% 5% 5% 5% 5% 32%	2153
	11th to 20th	Night	15% 13% 5% 10% 6% 4 5% 4 5% 5% 29%	2066
	21st to end	Night	17% 13% 4 6% 7% 3 4 4 4 6% 30%	2178
April	1st to 10th	Night	23% 11% 3 7% 6% 3 5% 5% 5% 6% 26%	1800
	11th to 20th	Night	20% 9% 4 6% 4 3 4 4 5% 6% 35%	1605
	21st to end	Night	24% 10% 4 6% 4 3 3 4 5% 5% 34%	1620
May	1st to 10th	Night	23% 8% 3 5% 5% 4 5% 4 4 5% 34%	1463
	11th to 20th	Night	19% 7% 3 6% 5% 3 4 5% 5% 6% 37%	1416
	21st to end	Night	18% 7% 3 6% 6% 3 5% 6% 6% 7% 33%	1431
June	1st to 10th	Night	25% 7% 2 6% 5% 3 4 4 6% 6% 31%	1260
	11th to 20th	Night	20% 6% 2 7% 5% 3 4 4 5% 7% 37%	1260
	21st to end	Night	22% 6% 3 6% 5% 3 6% 6% 6% 6% 30%	1260
July	1st to 10th	Night	17% 7% 2 5% 4 3 5% 4 6% 8% 38%	1260
	11th to 20th	Night	16% 6% 2 5% 6% 3 5% 5% 5% 7% 41%	1260
	21st to end	Night	16% 6% 3 6% 5% 4 6% 5% 6% 9% 36%	1453
August	1st to 10th	Night	16% 6% 2 5% 5% 3 4 5% 5% 7% 43%	1539
	11th to 20th	Night	18% 6% 2 5% 4 3 4 4 6% 8% 40%	1596
	21st to end	Night	13% 7% 2 5% 5% 4 4 6% 6% 8% 40%	1804
September	1st to 10th	Night	18% 6% 2 5% 4 3 4 4 5% 6% 43%	1800
	11th to 20th	Night	19% 6% 2 4 4 3 3 4 5% 5% 45%	1872
	21st to end	Night	19% 6% 2 4 4 3 3 3 4 6% 45%	2029
October	1st to 10th	Night	18% 7% 3 5% 5% 3 4 3 5% 6% 40%	2160
	11th to 20th	Night	23% 9% 2 6% 5% 3 4 5% 4 6% 33%	2160
	21st to end	Night	22% 9% 3 5% 5% 3 4 3 4 7% 33%	2520
November	1st to 10th	Night	20% 11% 3 7% 5% 3 4 5% 4 5% 33%	2593
	11th to 20th	Night	20% 11% 5% 8% 6% 3 5% 4 6% 7% 25%	2660
	21st to end	Night	20% 14% 6% 10% 6% 4 4 4 5% 5% 21%	2660
December	1st to 10th	Night	20% 13% 4 9% 8% 4 6% 5% 5% 7% 20%	2749
	11th to 20th	Night	19% 16% 5% 9% 8% 4 5% 5% 5% 5% 19%	3531
	21st to end	Night	18% 12% 5% 13% 8% 4 5% 5% 5% 6% 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	55% 21% 11% 10% 3	2208
	11th to 20th	Day	51% 12% 16% 15% 6%	2210
	21st to end	Day	47% 10% 17% 16% 9% 1	2800
February	1st to 10th	Day	50% 8% 12% 18% 10% 2	1710
	11th to 20th	Day	57% 7% 11% 16% 8%	1671
	21st to end	Day	51% 8% 8% 22% 9% 2	1413
March	1st to 10th	Day	53% 7% 10% 18% 10% 1	2015
	11th to 20th	Day	54% 7% 11% 16% 10% 2	2059
	21st to end	Day	54% 6% 11% 16% 10% 3	2178
April	1st to 10th	Day	58% 6% 9% 14% 12% 1	2160
	11th to 20th	Day	50% 6% 10% 20% 13% 1	2302
	21st to end	Day	54% 7% 13% 14% 12% 2	2340
May	1st to 10th	Day	56% 5% 10% 17% 10% 2	2497
	11th to 20th	Day	50% 6% 13% 19% 11% 1	2482
	21st to end	Day	49% 8% 14% 18% 10% 1	2857
June	1st to 10th	Day	54% 8% 11% 17% 9% 1	2700
	11th to 20th	Day	47% 7% 13% 22% 10% 1	2700
	21st to end	Day	56% 8% 13% 16% 7%	2700
July	1st to 10th	Day	46% 11% 17% 19% 7%	2625
	11th to 20th	Day	44% 9% 16% 21% 10%	2619
	21st to end	Day	49% 10% 16% 19% 6%	2688
August	1st to 10th	Day	44% 11% 20% 20% 5%	2384
	11th to 20th	Day	44% 11% 21% 18% 6% 1	2304
	21st to end	Day	44% 10% 16% 23% 7%	2551
September	1st to 10th	Day	43% 9% 16% 23% 9%	2160
	11th to 20th	Day	44% 5% 14% 27% 10%	2085
	21st to end	Day	45% 7% 13% 23% 11% 1	1931
October	1st to 10th	Day	44% 8% 16% 23% 8% 2	1800
	11th to 20th	Day	54% 6% 16% 18% 5% 1	1800
	21st to end	Day	59% 7% 11% 16% 7% 1	1832
November	1st to 10th	Day	57% 7% 13% 14% 9%	1485
	11th to 20th	Day	61% 6% 14% 13% 6%	1520
	21st to end	Day	64% 8% 12% 11% 6%	1520
December	1st to 10th	Day	63% 10% 11% 11% 4	1430
	11th to 20th	Day	67% 9% 10% 10% 4	1668
	21st to end	Day	59% 13% 12% 11% 3 1	2431
January	1st to 10th	Night	60% 15% 11% 10% 3	4748
	11th to 20th	Night	55% 13% 11% 14% 7%	4760
	21st to end	Night	45% 15% 14% 14% 9% 3	4846
February	1st to 10th	Night	52% 6% 10% 18% 12% 2	2470
	11th to 20th	Night	57% 8% 8% 17% 9%	2406
	21st to end	Night	51% 6% 9% 22% 12% 1	2041
March	1st to 10th	Night	54% 6% 8% 19% 12% 1	2162
	11th to 20th	Night	56% 6% 9% 18% 10% 1	2067
	21st to end	Night	54% 6% 12% 17% 9% 3	2178
April	1st to 10th	Night	57% 7% 10% 13% 13%	1800
	11th to 20th	Night	50% 5% 9% 23% 11% 1	1605
	21st to end	Night	53% 5% 10% 15% 15% 2	1620
May	1st to 10th	Night	53% 5% 10% 17% 13% 1	1463
	11th to 20th	Night	47% 7% 10% 24% 12%	1417
	21st to end	Night	48% 7% 12% 19% 13% 1	1432
June	1st to 10th	Night	53% 7% 11% 18% 10%	1260
	11th to 20th	Night	48% 7% 13% 18% 14% 1	1260
	21st to end	Night	53% 9% 12% 18% 8% 1	1260
July	1st to 10th	Night	44% 9% 17% 24% 6%	1225
	11th to 20th	Night	41% 9% 14% 28% 8% 1	1218
	21st to end	Night	46% 11% 15% 18% 10%	1372
August	1st to 10th	Night	41% 9% 20% 24% 7%	1528
	11th to 20th	Night	42% 10% 17% 23% 6% 1	1596
	21st to end	Night	40% 11% 15% 26% 8%	1804
September	1st to 10th	Night	42% 8% 13% 27% 10% 1	1800
	11th to 20th	Night	42% 6% 13% 26% 12%	1872
	21st to end	Night	41% 6% 12% 27% 14% 1	2029
October	1st to 10th	Night	45% 7% 13% 23% 11% 1	2160
	11th to 20th	Night	52% 7% 13% 20% 7%	2160
	21st to end	Night	52% 7% 14% 20% 7% 1	2520
November	1st to 10th	Night	52% 8% 14% 17% 7% 1	2593
	11th to 20th	Night	58% 8% 13% 15% 5% 1	2660
	21st to end	Night	64% 9% 12% 10% 4	2660
December	1st to 10th	Night	64% 11% 10% 12% 3	2749
	11th to 20th	Night	67% 8% 8% 13% 4	3532
	21st to end	Night	65% 9% 13% 11% 3	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	34% 15% 29% 19% 2 1	180
	11th to 20th	Day	32% 21% 29% 12% 6% 1	180
	21st to end	Day	17% 23% 31% 21% 7% 2	307
February	1st to 10th	Day	23% 22% 31% 15% 8% 1	370
	11th to 20th	Day	20% 26% 33% 17% 4 1	366
	21st to end	Day	17% 21% 33% 22% 6% 1	307
March	1st to 10th	Day	20% 24% 35% 15% 5% 1	445
	11th to 20th	Day	21% 22% 30% 20% 6% 1	449
	21st to end	Day	27% 22% 29% 15% 4 2	462
April	1st to 10th	Day	30% 26% 25% 16% 3 1	420
	11th to 20th	Day	26% 17% 33% 17% 5% 1	412
	21st to end	Day	25% 19% 27% 22% 6% 2	420
May	1st to 10th	Day	29% 14% 28% 19% 7% 3	580
	11th to 20th	Day	26% 14% 27% 21% 9% 3	624
	21st to end	Day	26% 20% 29% 18% 6% 1	680
June	1st to 10th	Day	29% 16% 27% 20% 7% 2	630
	11th to 20th	Day	23% 13% 29% 23% 11% 2	630
	21st to end	Day	27% 11% 30% 21% 10% 2	630
July	1st to 10th	Day	19% 8% 35% 27% 10% 2	620
	11th to 20th	Day	13% 11% 33% 28% 13% 2	618
	21st to end	Day	18% 9% 25% 32% 13% 3	685
August	1st to 10th	Day	17% 7% 27% 30% 17% 2	517
	11th to 20th	Day	16% 6% 33% 28% 14% 3	439
	21st to end	Day	17% 12% 32% 27% 10% 3	495
September	1st to 10th	Day	21% 15% 34% 19% 9% 3	450
	11th to 20th	Day	26% 18% 29% 18% 7% 3	450
	21st to end	Day	23% 22% 29% 19% 6% 1	426
October	1st to 10th	Day	16% 23% 29% 20% 9% 2	360
	11th to 20th	Day	27% 20% 27% 16% 8% 2	360
	21st to end	Day	31% 20% 26% 15% 7% 1	396
November	1st to 10th	Day	27% 20% 26% 20% 5% 1	365
	11th to 20th	Day	28% 21% 28% 15% 6% 2	370
	21st to end	Day	32% 21% 29% 17% 2	370
December	1st to 10th	Day	25% 16% 36% 19% 4 1	280
	11th to 20th	Day	31% 26% 28% 12% 3 1	180
	21st to end	Day	25% 28% 30% 12% 4 1	198
January	1st to 10th	Night	24% 19% 31% 19% 6% 1	850
	11th to 20th	Night	23% 20% 31% 21% 5%	850
	21st to end	Night	19% 19% 32% 22% 8% 1	876
February	1st to 10th	Night	20% 18% 31% 24% 6% 1	760
	11th to 20th	Night	25% 16% 34% 19% 5% 1	743
	21st to end	Night	19% 19% 29% 21% 9% 2	628
March	1st to 10th	Night	21% 18% 31% 22% 7% 1	760
	11th to 20th	Night	23% 18% 29% 21% 8% 1	752
	21st to end	Night	26% 16% 27% 22% 8% 1	792
April	1st to 10th	Night	30% 13% 28% 21% 7% 1	540
	11th to 20th	Night	25% 12% 29% 23% 8% 1	534
	21st to end	Night	29% 9% 27% 24% 10% 1	540
May	1st to 10th	Night	28% 8% 21% 29% 13% 2	540
	11th to 20th	Night	23% 9% 25% 27% 13% 2	532
	21st to end	Night	21% 13% 27% 29% 8% 2	464
June	1st to 10th	Night	29% 6% 23% 28% 14% 1	360
	11th to 20th	Night	24% 7% 21% 30% 15% 3	360
	21st to end	Night	23% 5% 21% 33% 16% 1	360
July	1st to 10th	Night	18% 5% 19% 39% 18% 2	350
	11th to 20th	Night	19% 7% 19% 37% 18% 1	348
	21st to end	Night	17% 6% 21% 35% 19% 2	470
August	1st to 10th	Night	19% 4 16% 39% 20% 1	538
	11th to 20th	Night	19% 3 20% 34% 22% 1	532
	21st to end	Night	16% 6% 25% 31% 19% 2	594
September	1st to 10th	Night	21% 10% 26% 29% 13% 1	540
	11th to 20th	Night	22% 11% 26% 27% 13% 1	612
	21st to end	Night	22% 12% 29% 27% 10%	720
October	1st to 10th	Night	21% 17% 27% 24% 10% 1	720
	11th to 20th	Night	27% 16% 23% 23% 10% 1	720
	21st to end	Night	27% 16% 25% 23% 8%	821
November	1st to 10th	Night	28% 18% 27% 21% 6% 1	830
	11th to 20th	Night	29% 18% 29% 17% 6% 2	850
	21st to end	Night	29% 21% 27% 18% 4 1	850
December	1st to 10th	Night	29% 18% 32% 15% 5% 1	850
	11th to 20th	Night	28% 25% 28% 14% 4	850
	21st to end	Night	28% 20% 27% 19% 5% 1	935

Page generated at 2024-03-15 14:01:41. Version ac07

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