Saint-Agapit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saint-Agapit clear sky chart from 2005-11-06 to 2024-11-04.

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% 11% 4 8% 5% 4 4 4 5% 6% 30%	101312
	Night	19% 12% 4 9% 5% 4 4 3 5% 5% 29%	97715
Transparency	Day	53% 7% 13% 18% 8% 1	104785
	Night	55% 7% 12% 17% 8% 1	102332
Seeing	Day	25% 16% 29% 20% 8% 2	15142
	Night	25% 12% 30% 25% 7%	23692

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	16% 20% 6% 14% 6% 5% 4 3 4 4 18%	2517
	11th to 20th	Day	13% 15% 7% 17% 8% 4 3 3 3 3 23%	2520
	21st to end	Day	10% 13% 6% 12% 6% 5% 5% 4 5% 7% 27%	2772
February	1st to 10th	Day	13% 17% 6% 13% 8% 5% 4 3 4 4 23%	1522
	11th to 20th	Day	13% 17% 7% 11% 6% 6% 5% 3 4 6% 22%	1847
	21st to end	Day	12% 16% 6% 11% 6% 4 4 3 4 6% 26%	1570
March	1st to 10th	Day	18% 12% 5% 10% 5% 5% 4 3 5% 5% 27%	3116
	11th to 20th	Day	17% 20% 5% 10% 5% 4 3 3 4 4 24%	3311
	21st to end	Day	17% 13% 4 8% 4 3 4 3 4 4 35%	4065
April	1st to 10th	Day	23% 13% 4 9% 5% 4 4 3 4 5% 28%	2280
	11th to 20th	Day	20% 11% 3 7% 4 4 4 3 4 6% 36%	2334
	21st to end	Day	23% 11% 4 8% 4 4 4 3 4 4 30%	2470
May	1st to 10th	Day	22% 8% 2 7% 4 4 4 3 5% 6% 34%	4197
	11th to 20th	Day	17% 8% 3 7% 6% 5% 5% 5% 7% 8% 29%	4398
	21st to end	Day	17% 7% 3 8% 6% 5% 6% 4 7% 6% 31%	4837
June	1st to 10th	Day	20% 7% 3 7% 5% 6% 6% 4 6% 7% 28%	2824
	11th to 20th	Day	19% 6% 2 6% 4 4 5% 4 6% 8% 35%	2850
	21st to end	Day	24% 8% 3 8% 5% 5% 4 4 5% 6% 27%	2829
July	1st to 10th	Day	14% 8% 3 8% 6% 6% 5% 4 6% 8% 31%	4440
	11th to 20th	Day	16% 8% 2 8% 5% 5% 5% 5% 7% 9% 31%	4440
	21st to end	Day	14% 7% 3 5% 4 4 5% 4 6% 7% 41%	4814
August	1st to 10th	Day	17% 7% 3 7% 5% 5% 6% 5% 7% 10% 28%	4399
	11th to 20th	Day	20% 7% 3 7% 5% 5% 5% 4 6% 8% 29%	4045
	21st to end	Day	21% 7% 2 6% 4 4 4 3 5% 6% 38%	4312
September	1st to 10th	Day	17% 5% 2 7% 5% 4 4 4 6% 8% 38%	2280
	11th to 20th	Day	17% 7% 2 6% 3 3 3 3 5% 7% 45%	2115
	21st to end	Day	19% 8% 3 6% 4 4 4 3 5% 6% 38%	2090
October	1st to 10th	Day	21% 8% 3 7% 5% 4 4 4 5% 7% 31%	2082
	11th to 20th	Day	21% 11% 4 9% 6% 4 5% 5% 5% 5% 26%	1748
	21st to end	Day	27% 14% 3 7% 5% 4 4 3 4 5% 24%	1881
November	1st to 10th	Day	20% 12% 3 7% 6% 4 4 3 4 5% 32%	1698
	11th to 20th	Day	22% 15% 4 11% 6% 3 4 3 4 5% 24%	1710
	21st to end	Day	23% 18% 5% 9% 5% 4 4 3 4 4 23%	1411
December	1st to 10th	Day	24% 17% 5% 12% 4 4 3 2 4 3 20%	1330
	11th to 20th	Day	21% 16% 4 11% 6% 5% 3 2 4 4 23%	1668
	21st to end	Day	25% 16% 4 10% 5% 4 4 3 4 4 20%	2590
January	1st to 10th	Night	17% 18% 6% 13% 6% 4 4 3 4 4 21%	4429
	11th to 20th	Night	13% 17% 7% 15% 7% 5% 5% 3 4 4 20%	4440
	21st to end	Night	13% 15% 6% 12% 6% 6% 5% 4 5% 6% 23%	4884
February	1st to 10th	Night	13% 15% 6% 12% 9% 5% 5% 4 4 5% 23%	2656
	11th to 20th	Night	13% 17% 5% 13% 7% 6% 4 3 4 4 23%	2218
	21st to end	Night	15% 16% 5% 9% 6% 4 4 3 5% 5% 29%	1884
March	1st to 10th	Night	23% 14% 3 7% 4 4 5% 2 4 4 29%	3724
	11th to 20th	Night	18% 17% 5% 10% 6% 5% 4 3 4 4 23%	3647
	21st to end	Night	18% 15% 4 8% 6% 4 3 3 4 4 31%	3564
April	1st to 10th	Night	22% 13% 5% 7% 4 3 4 3 5% 6% 28%	1900
	11th to 20th	Night	22% 11% 3 7% 5% 4 4 4 4 6% 32%	1794
	21st to end	Night	25% 10% 3 7% 5% 3 2 3 4 5% 33%	1710
May	1st to 10th	Night	22% 8% 3 8% 5% 4 5% 3 5% 5% 30%	2771
	11th to 20th	Night	22% 9% 3 6% 5% 4 4 3 5% 6% 33%	2495
	21st to end	Night	18% 6% 3 6% 4 5% 5% 4 6% 8% 36%	2738
June	1st to 10th	Night	21% 9% 3 5% 5% 4 5% 4 6% 8% 29%	1352
	11th to 20th	Night	18% 7% 3 7% 5% 4 5% 4 6% 7% 34%	1330
	21st to end	Night	20% 9% 2 8% 7% 4 5% 4 5% 6% 29%	1345
July	1st to 10th	Night	13% 8% 3 8% 6% 6% 6% 4 7% 8% 31%	2520
	11th to 20th	Night	19% 7% 3 6% 5% 4 4 4 5% 7% 35%	2520
	21st to end	Night	13% 6% 3 7% 5% 5% 5% 4 6% 7% 39%	2739
August	1st to 10th	Night	19% 8% 3 7% 5% 5% 4 4 6% 8% 31%	2506
	11th to 20th	Night	17% 8% 3 8% 6% 6% 6% 5% 5% 8% 30%	2775
	21st to end	Night	19% 6% 3 7% 5% 5% 4 3 5% 6% 37%	3341
September	1st to 10th	Night	18% 6% 3 7% 4 4 3 3 5% 7% 40%	1900
	11th to 20th	Night	16% 7% 2 6% 3 3 3 3 4 6% 46%	2064
	21st to end	Night	18% 7% 2 6% 5% 4 4 3 5% 7% 41%	2090
October	1st to 10th	Night	18% 9% 3 7% 4 4 5% 4 5% 5% 37%	2095
	11th to 20th	Night	24% 9% 3 8% 5% 5% 4 3 5% 5% 31%	2432
	21st to end	Night	25% 12% 3 8% 4 4 3 3 5% 5% 28%	2717
November	1st to 10th	Night	19% 12% 4 9% 5% 4 4 3 4 7% 29%	2453
	11th to 20th	Night	19% 13% 5% 10% 5% 4 4 3 4 5% 29%	2470
	21st to end	Night	21% 18% 5% 10% 5% 4 3 3 3 5% 23%	2764
December	1st to 10th	Night	23% 17% 5% 11% 6% 4 4 4 4 4 19%	2850
	11th to 20th	Night	20% 18% 5% 11% 5% 4 3 3 4 4 22%	3531
	21st to end	Night	25% 21% 4 8% 4 3 3 2 3 3 24%	5067

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	68% 7% 11% 11% 3	2518
	11th to 20th	Day	64% 7% 8% 16% 4 1	2520
	21st to end	Day	54% 10% 12% 17% 7%	2772
February	1st to 10th	Day	66% 4 9% 13% 7% 1	1522
	11th to 20th	Day	64% 5% 11% 12% 6% 1	1856
	21st to end	Day	59% 5% 11% 16% 7% 2	1570
March	1st to 10th	Day	56% 8% 11% 16% 8% 2	3119
	11th to 20th	Day	62% 6% 11% 14% 6% 1	3311
	21st to end	Day	52% 5% 9% 18% 12% 4	4065
April	1st to 10th	Day	60% 4 10% 14% 9% 3	2280
	11th to 20th	Day	50% 5% 10% 21% 10% 2	2334
	21st to end	Day	57% 5% 9% 15% 11% 3	2470
May	1st to 10th	Day	50% 6% 12% 18% 13% 1	4211
	11th to 20th	Day	48% 12% 17% 15% 7% 1	4402
	21st to end	Day	49% 9% 11% 18% 13% 1	4837
June	1st to 10th	Day	53% 9% 11% 19% 7% 1	2824
	11th to 20th	Day	45% 8% 15% 20% 11% 1	2850
	21st to end	Day	57% 8% 11% 16% 9%	2829
July	1st to 10th	Day	47% 8% 16% 23% 6%	4370
	11th to 20th	Day	46% 10% 19% 21% 4	4365
	21st to end	Day	40% 8% 17% 27% 8%	4661
August	1st to 10th	Day	47% 11% 19% 19% 4	4385
	11th to 20th	Day	49% 10% 19% 16% 5%	4084
	21st to end	Day	46% 7% 14% 20% 12% 1	4312
September	1st to 10th	Day	43% 7% 15% 24% 9% 1	2280
	11th to 20th	Day	39% 5% 16% 28% 11%	2115
	21st to end	Day	47% 6% 14% 25% 9%	2090
October	1st to 10th	Day	53% 7% 14% 22% 4	3459
	11th to 20th	Day	53% 6% 18% 20% 2	2886
	21st to end	Day	55% 6% 15% 17% 6%	3081
November	1st to 10th	Day	55% 6% 13% 18% 7%	1698
	11th to 20th	Day	63% 5% 10% 15% 6%	1710
	21st to end	Day	65% 6% 14% 11% 4	1411
December	1st to 10th	Day	69% 5% 11% 11% 4	1330
	11th to 20th	Day	65% 4 9% 16% 6%	1668
	21st to end	Day	67% 8% 9% 9% 6% 1	2590
January	1st to 10th	Night	67% 7% 11% 10% 4	4429
	11th to 20th	Night	64% 8% 11% 13% 3	4440
	21st to end	Night	60% 8% 11% 14% 7% 1	4884
February	1st to 10th	Night	63% 5% 9% 15% 7% 1	2656
	11th to 20th	Night	64% 6% 9% 13% 8% 1	2220
	21st to end	Night	58% 4 10% 15% 11% 2	1884
March	1st to 10th	Night	58% 6% 12% 15% 7% 2	3734
	11th to 20th	Night	64% 6% 9% 13% 7% 1	3648
	21st to end	Night	57% 5% 8% 19% 8% 2	3564
April	1st to 10th	Night	57% 5% 11% 15% 11% 2	1900
	11th to 20th	Night	52% 5% 9% 20% 11% 2	1794
	21st to end	Night	55% 4 9% 17% 14% 2	1710
May	1st to 10th	Night	53% 7% 14% 17% 9% 1	2777
	11th to 20th	Night	49% 8% 13% 18% 12% 1	2496
	21st to end	Night	45% 7% 13% 18% 17% 1	2739
June	1st to 10th	Night	51% 8% 12% 21% 9% 1	1352
	11th to 20th	Night	47% 8% 11% 19% 12% 2	1330
	21st to end	Night	54% 8% 12% 17% 9% 1	1345
July	1st to 10th	Night	47% 9% 19% 19% 7%	2480
	11th to 20th	Night	46% 8% 20% 20% 5%	2472
	21st to end	Night	41% 9% 19% 24% 8%	2651
August	1st to 10th	Night	48% 9% 16% 22% 5%	2496
	11th to 20th	Night	50% 11% 16% 17% 5%	2802
	21st to end	Night	47% 8% 13% 20% 12%	3341
September	1st to 10th	Night	43% 8% 14% 24% 11% 1	1900
	11th to 20th	Night	39% 7% 16% 28% 9% 1	2064
	21st to end	Night	43% 7% 12% 24% 12%	2090
October	1st to 10th	Night	49% 7% 13% 24% 7%	3498
	11th to 20th	Night	52% 6% 15% 25% 3	4033
	21st to end	Night	51% 6% 18% 16% 9%	4467
November	1st to 10th	Night	56% 7% 13% 18% 6%	2453
	11th to 20th	Night	59% 6% 13% 14% 8%	2470
	21st to end	Night	64% 5% 12% 13% 5%	2764
December	1st to 10th	Night	70% 5% 11% 11% 3	2850
	11th to 20th	Night	65% 6% 9% 14% 6%	3532
	21st to end	Night	67% 4 8% 15% 5% 1	5067

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% 21% 28% 16% 1 1	180
	11th to 20th	Day	26% 27% 34% 8% 4	180
	21st to end	Day	21% 22% 35% 17% 5% 1	198
February	1st to 10th	Day	25% 28% 35% 8% 3 1	182
	11th to 20th	Day	25% 23% 36% 14% 2	455
	21st to end	Day	25% 25% 31% 16% 3	382
March	1st to 10th	Day	29% 20% 29% 18% 4	460
	11th to 20th	Day	27% 20% 30% 16% 5% 1	460
	21st to end	Day	25% 20% 29% 16% 7% 2	506
April	1st to 10th	Day	32% 17% 28% 17% 6%	460
	11th to 20th	Day	29% 18% 28% 18% 6% 1	452
	21st to end	Day	32% 18% 30% 13% 5% 1	460
May	1st to 10th	Day	29% 17% 32% 17% 4 1	463
	11th to 20th	Day	21% 13% 33% 23% 10% 1	487
	21st to end	Day	22% 21% 33% 16% 8%	529
June	1st to 10th	Day	22% 13% 32% 24% 7% 1	654
	11th to 20th	Day	21% 11% 30% 26% 12% 1	680
	21st to end	Day	27% 11% 26% 23% 12% 1	659
July	1st to 10th	Day	17% 12% 32% 26% 11% 2	485
	11th to 20th	Day	18% 13% 35% 24% 9% 2	484
	21st to end	Day	18% 8% 33% 29% 10% 2	532
August	1st to 10th	Day	19% 12% 26% 28% 11% 3	486
	11th to 20th	Day	21% 7% 24% 27% 17% 3	479
	21st to end	Day	22% 15% 24% 19% 14% 6%	539
September	1st to 10th	Day	19% 12% 27% 27% 11% 4	490
	11th to 20th	Day	19% 10% 26% 25% 16% 4	490
	21st to end	Day	21% 14% 25% 23% 14% 3	490
October	1st to 10th	Day	24% 14% 27% 23% 10% 2	490
	11th to 20th	Day	29% 18% 25% 18% 9% 1	410
	21st to end	Day	35% 15% 26% 20% 4	429
November	1st to 10th	Day	32% 14% 30% 17% 6% 1	374
	11th to 20th	Day	28% 20% 28% 16% 7% 1	370
	21st to end	Day	35% 17% 30% 15% 2	189
December	1st to 10th	Day	33% 16% 27% 18% 6% 1	180
	11th to 20th	Day	33% 20% 31% 11% 4 1	180
	21st to end	Day	36% 22% 27% 12% 3	198
January	1st to 10th	Night	28% 18% 34% 18% 3	760
	11th to 20th	Night	26% 18% 33% 19% 3	760
	21st to end	Night	17% 14% 36% 27% 5%	836
February	1st to 10th	Night	21% 14% 37% 23% 4	760
	11th to 20th	Night	23% 19% 38% 17% 3	743
	21st to end	Night	25% 15% 33% 23% 4	628
March	1st to 10th	Night	26% 14% 36% 22% 3	760
	11th to 20th	Night	28% 14% 34% 19% 5% 1	760
	21st to end	Night	24% 13% 32% 24% 6%	836
April	1st to 10th	Night	30% 14% 30% 21% 5%	760
	11th to 20th	Night	27% 12% 33% 23% 5%	670
	21st to end	Night	31% 14% 28% 22% 5%	570
May	1st to 10th	Night	27% 10% 32% 25% 6%	533
	11th to 20th	Night	22% 12% 29% 32% 4 1	374
	21st to end	Night	23% 11% 32% 29% 6%	411
June	1st to 10th	Night	26% 7% 29% 31% 6%	380
	11th to 20th	Night	21% 7% 27% 37% 8%	380
	21st to end	Night	24% 7% 28% 33% 8%	380
July	1st to 10th	Night	16% 6% 34% 35% 8%	370
	11th to 20th	Night	17% 6% 25% 40% 12% 1	368
	21st to end	Night	14% 7% 23% 47% 8%	416
August	1st to 10th	Night	18% 3 22% 40% 16% 1	378
	11th to 20th	Night	18% 5% 24% 37% 14% 2	555
	21st to end	Night	18% 7% 27% 32% 15% 1	753
September	1st to 10th	Night	20% 6% 28% 33% 12% 1	760
	11th to 20th	Night	20% 7% 24% 31% 16% 2	760
	21st to end	Night	21% 8% 28% 28% 14% 1	760
October	1st to 10th	Night	23% 9% 26% 32% 8% 1	760
	11th to 20th	Night	29% 11% 28% 22% 8% 1	760
	21st to end	Night	32% 12% 32% 19% 5%	836
November	1st to 10th	Night	27% 15% 28% 23% 6%	755
	11th to 20th	Night	26% 17% 29% 19% 9% 1	760
	21st to end	Night	30% 16% 29% 18% 6% 1	814
December	1st to 10th	Night	32% 14% 30% 18% 6%	850
	11th to 20th	Night	27% 19% 28% 20% 6%	850
	21st to end	Night	34% 17% 30% 16% 3 1	886

Page generated at 2024-11-01 22:47:34. Version ac07

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