Parc National d'Aiguebelle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Parc National d'Aiguebelle clear sky chart from 2005-11-06 to 2024-12-09.

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% 12% 4 9% 5% 5% 5% 4 5% 6% 27%	102084
	Night	17% 14% 5% 11% 6% 5% 5% 3 4 5% 25%	97744
Transparency	Day	59% 3 11% 20% 8% 1	105571
	Night	62% 3 10% 17% 7% 1	102347
Seeing	Day	25% 13% 32% 20% 8% 2	15222
	Night	25% 11% 29% 25% 8% 1	24167

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	14% 24% 8% 14% 4 7% 8% 4 6% 4 8%	2208
	11th to 20th	Day	10% 15% 7% 19% 9% 5% 6% 5% 5% 4 14%	2210
	21st to end	Day	12% 21% 9% 15% 5% 5% 5% 4 4 5% 13%	2906
February	1st to 10th	Day	9% 17% 6% 12% 8% 9% 8% 4 6% 6% 16%	1710
	11th to 20th	Day	10% 18% 5% 13% 7% 7% 6% 5% 5% 6% 17%	1663
	21st to end	Day	12% 17% 6% 12% 6% 6% 4 4 5% 5% 22%	1413
March	1st to 10th	Day	20% 14% 4 8% 5% 4 5% 3 5% 5% 26%	3324
	11th to 20th	Day	12% 18% 6% 17% 6% 4 3 3 2 4 26%	3480
	21st to end	Day	12% 16% 5% 12% 6% 7% 6% 3 4 4 27%	3866
April	1st to 10th	Day	19% 17% 4 9% 5% 5% 4 3 4 5% 25%	2280
	11th to 20th	Day	20% 12% 4 9% 5% 4 4 3 4 6% 30%	2385
	21st to end	Day	21% 14% 3 7% 4 3 4 3 4 5% 31%	2470
May	1st to 10th	Day	19% 12% 3 7% 6% 5% 4 3 5% 7% 30%	4426
	11th to 20th	Day	17% 9% 3 8% 5% 5% 5% 4 6% 6% 32%	4398
	21st to end	Day	19% 9% 3 7% 5% 4 4 3 5% 7% 35%	4919
June	1st to 10th	Day	24% 8% 3 6% 5% 5% 5% 3 5% 7% 29%	2850
	11th to 20th	Day	16% 8% 4 6% 5% 5% 4 3 5% 7% 35%	2850
	21st to end	Day	21% 8% 2 7% 5% 4 4 4 6% 6% 31%	2850
July	1st to 10th	Day	18% 7% 3 7% 5% 6% 5% 4 6% 9% 30%	4760
	11th to 20th	Day	16% 7% 2 7% 5% 5% 5% 4 7% 7% 36%	4760
	21st to end	Day	17% 7% 3 7% 4 4 5% 4 6% 8% 36%	4892
August	1st to 10th	Day	16% 7% 3 7% 5% 5% 5% 5% 7% 8% 32%	4270
	11th to 20th	Day	19% 7% 3 6% 5% 5% 5% 4 5% 8% 34%	4044
	21st to end	Day	16% 6% 3 6% 5% 5% 4 4 5% 8% 39%	4418
September	1st to 10th	Day	21% 7% 3 7% 4 5% 5% 5% 6% 7% 31%	2280
	11th to 20th	Day	22% 9% 3 5% 4 4 4 3 6% 8% 32%	2241
	21st to end	Day	25% 11% 3 5% 4 4 4 3 4 6% 30%	2009
October	1st to 10th	Day	24% 11% 3 8% 5% 3 4 3 4 5% 30%	1900
	11th to 20th	Day	31% 20% 3 7% 3 4 3 3 4 4 17%	1900
	21st to end	Day	29% 19% 4 8% 5% 4 5% 3 4 4 14%	1954
November	1st to 10th	Day	22% 22% 5% 11% 5% 4 3 3 3 5% 17%	1566
	11th to 20th	Day	22% 20% 7% 15% 7% 6% 3 2 4 3 12%	1600
	21st to end	Day	25% 24% 10% 12% 6% 3 3 3 3 3 8%	1600
December	1st to 10th	Day	17% 23% 7% 16% 8% 4 4 3 4 5% 10%	1580
	11th to 20th	Day	17% 18% 6% 12% 9% 6% 5% 4 4 3 15%	1671
	21st to end	Day	16% 22% 8% 18% 8% 5% 4 3 3 3 10%	2431
January	1st to 10th	Night	13% 17% 9% 16% 10% 7% 6% 3 3 4 12%	4748
	11th to 20th	Night	11% 17% 6% 17% 9% 6% 6% 4 5% 4 15%	4760
	21st to end	Night	9% 20% 10% 15% 8% 7% 6% 3 5% 4 12%	4745
February	1st to 10th	Night	10% 18% 5% 11% 10% 6% 6% 5% 5% 6% 19%	2470
	11th to 20th	Night	12% 16% 7% 13% 8% 6% 5% 3 4 5% 21%	2403
	21st to end	Night	10% 17% 6% 13% 8% 7% 7% 3 5% 7% 19%	2041
March	1st to 10th	Night	16% 15% 5% 8% 5% 5% 5% 3 5% 6% 28%	3515
	11th to 20th	Night	14% 19% 7% 13% 7% 6% 4 3 3 4 19%	3479
	21st to end	Night	14% 12% 5% 11% 5% 5% 5% 3 5% 5% 29%	3765
April	1st to 10th	Night	20% 16% 4 9% 5% 5% 3 2 4 4 29%	1900
	11th to 20th	Night	19% 9% 3 8% 5% 4 5% 4 6% 5% 31%	1760
	21st to end	Night	20% 10% 4 8% 5% 4 3 3 4 6% 34%	1710
May	1st to 10th	Night	21% 10% 3 7% 5% 5% 5% 3 5% 4 32%	2514
	11th to 20th	Night	17% 9% 3 6% 4 4 4 4 5% 7% 37%	2495
	21st to end	Night	20% 6% 3 6% 4 4 6% 4 7% 7% 32%	2655
June	1st to 10th	Night	22% 7% 4 7% 6% 4 4 4 4 6% 32%	1330
	11th to 20th	Night	17% 8% 3 6% 3 4 3 3 5% 7% 41%	1330
	21st to end	Night	17% 5% 3 6% 5% 5% 5% 5% 5% 6% 38%	1330
July	1st to 10th	Night	19% 7% 2 6% 4 4 4 4 5% 7% 38%	2210
	11th to 20th	Night	19% 8% 2 8% 4 5% 5% 5% 6% 7% 32%	2210
	21st to end	Night	17% 8% 2 5% 4 4 4 4 5% 7% 39%	2648
August	1st to 10th	Night	12% 6% 2 7% 5% 5% 6% 4 6% 7% 39%	2655
	11th to 20th	Night	15% 8% 2 7% 4 4 5% 4 5% 7% 39%	2785
	21st to end	Night	17% 7% 3 7% 5% 4 4 3 4 7% 40%	3206
September	1st to 10th	Night	19% 7% 3 7% 5% 4 5% 3 5% 6% 37%	1900
	11th to 20th	Night	20% 8% 3 6% 4 3 3 3 5% 6% 38%	1937
	21st to end	Night	22% 8% 2 6% 4 4 4 3 4 6% 37%	2171
October	1st to 10th	Night	21% 11% 3 8% 4 4 4 3 5% 6% 31%	2280
	11th to 20th	Night	27% 19% 4 9% 5% 3 4 2 3 4 19%	2280
	21st to end	Night	24% 19% 4 9% 5% 4 4 3 4 5% 19%	2639
November	1st to 10th	Night	20% 20% 7% 9% 5% 4 4 3 4 5% 20%	2732
	11th to 20th	Night	20% 19% 7% 13% 7% 5% 3 3 4 3 15%	2800
	21st to end	Night	23% 22% 6% 14% 6% 5% 4 3 4 4 10%	2800
December	1st to 10th	Night	17% 23% 8% 15% 8% 5% 4 3 4 4 10%	2779
	11th to 20th	Night	18% 20% 7% 13% 9% 5% 5% 3 4 3 13%	3526
	21st to end	Night	19% 20% 11% 17% 7% 4 3 2 3 3 11%	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	79% 2 11% 7% 1	2209
	11th to 20th	Day	73% 3 6% 15% 3	2210
	21st to end	Day	74% 2 7% 12% 5%	2906
February	1st to 10th	Day	69% 3 7% 15% 6%	1710
	11th to 20th	Day	68% 3 7% 15% 6%	1672
	21st to end	Day	64% 3 8% 18% 7% 1	1413
March	1st to 10th	Day	62% 3 7% 19% 8%	3327
	11th to 20th	Day	65% 2 6% 19% 8% 1	3480
	21st to end	Day	62% 2 5% 20% 9% 2	3866
April	1st to 10th	Day	63% 3 9% 15% 10% 1	2280
	11th to 20th	Day	58% 2 8% 20% 11% 1	2385
	21st to end	Day	56% 3 8% 17% 14% 2	2470
May	1st to 10th	Day	55% 3 8% 23% 10% 1	4440
	11th to 20th	Day	52% 2 13% 24% 9% 1	4402
	21st to end	Day	50% 3 10% 20% 15% 1	4919
June	1st to 10th	Day	54% 3 9% 23% 9% 1	2850
	11th to 20th	Day	48% 4 9% 25% 13% 1	2850
	21st to end	Day	52% 4 12% 22% 10% 1	2850
July	1st to 10th	Day	51% 3 16% 25% 6%	4686
	11th to 20th	Day	45% 4 18% 23% 10% 1	4679
	21st to end	Day	47% 3 14% 29% 7%	4737
August	1st to 10th	Day	49% 3 17% 25% 5%	4256
	11th to 20th	Day	49% 4 15% 23% 9%	4083
	21st to end	Day	44% 3 13% 30% 10% 1	4418
September	1st to 10th	Day	51% 5% 15% 21% 8% 1	2280
	11th to 20th	Day	51% 4 19% 21% 5%	2241
	21st to end	Day	56% 3 12% 22% 6%	2009
October	1st to 10th	Day	61% 3 10% 20% 5% 1	3160
	11th to 20th	Day	63% 3 12% 17% 5%	3140
	21st to end	Day	71% 3 12% 7% 5%	3195
November	1st to 10th	Day	72% 3 11% 9% 4	1566
	11th to 20th	Day	78% 3 7% 9% 3	1600
	21st to end	Day	84% 3 6% 5% 2	1600
December	1st to 10th	Day	77% 3 7% 10% 2	1580
	11th to 20th	Day	74% 3 4 16% 3	1671
	21st to end	Day	82% 2 6% 8% 2	2431
January	1st to 10th	Night	78% 2 12% 7% 1	4748
	11th to 20th	Night	73% 2 7% 13% 5%	4760
	21st to end	Night	76% 2 6% 11% 5%	4745
February	1st to 10th	Night	65% 3 8% 15% 9%	2470
	11th to 20th	Night	67% 3 8% 15% 7%	2405
	21st to end	Night	67% 3 7% 15% 8% 1	2041
March	1st to 10th	Night	58% 3 10% 15% 13% 2	3525
	11th to 20th	Night	71% 2 7% 13% 5% 1	3480
	21st to end	Night	58% 2 6% 18% 14% 3	3765
April	1st to 10th	Night	60% 2 7% 17% 13% 1	1900
	11th to 20th	Night	52% 4 9% 21% 13% 1	1760
	21st to end	Night	54% 2 6% 18% 17% 2	1710
May	1st to 10th	Night	55% 3 9% 16% 14% 2	2520
	11th to 20th	Night	46% 3 13% 25% 12% 1	2496
	21st to end	Night	50% 3 11% 21% 13% 2	2656
June	1st to 10th	Night	54% 4 8% 21% 12% 1	1330
	11th to 20th	Night	44% 3 10% 24% 15% 3	1330
	21st to end	Night	45% 5% 12% 24% 13% 1	1330
July	1st to 10th	Night	46% 3 15% 28% 8%	2175
	11th to 20th	Night	50% 3 16% 22% 8% 1	2168
	21st to end	Night	45% 2 15% 31% 6%	2563
August	1st to 10th	Night	43% 4 17% 32% 5%	2645
	11th to 20th	Night	45% 3 17% 29% 6%	2812
	21st to end	Night	46% 3 15% 25% 9% 2	3206
September	1st to 10th	Night	48% 4 16% 22% 8% 1	1900
	11th to 20th	Night	48% 4 17% 24% 6%	1937
	21st to end	Night	50% 3 15% 26% 7%	2171
October	1st to 10th	Night	55% 3 12% 21% 8%	3800
	11th to 20th	Night	63% 2 10% 22% 2	3779
	21st to end	Night	64% 4 15% 11% 6%	4348
November	1st to 10th	Night	68% 3 12% 13% 2	2732
	11th to 20th	Night	75% 3 8% 10% 4	2800
	21st to end	Night	80% 3 8% 7% 1	2800
December	1st to 10th	Night	79% 3 8% 8% 2	2779
	11th to 20th	Night	77% 3 6% 11% 3	3525
	21st to end	Night	81% 2 5% 8% 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	24% 23% 36% 12% 6% 1	180
	11th to 20th	Day	21% 13% 36% 22% 6% 2	180
	21st to end	Day	17% 15% 36% 23% 7% 2	246
February	1st to 10th	Day	19% 23% 37% 16% 4 1	270
	11th to 20th	Day	21% 19% 41% 16% 3	270
	21st to end	Day	29% 21% 37% 10% 2	225
March	1st to 10th	Day	22% 15% 42% 14% 7%	455
	11th to 20th	Day	24% 16% 34% 19% 6%	460
	21st to end	Day	27% 16% 34% 15% 7% 1	506
April	1st to 10th	Day	26% 18% 28% 18% 8% 2	460
	11th to 20th	Day	27% 17% 32% 17% 6% 2	452
	21st to end	Day	31% 16% 28% 18% 6% 2	460
May	1st to 10th	Day	26% 10% 33% 22% 7% 2	463
	11th to 20th	Day	26% 16% 30% 20% 6% 3	487
	21st to end	Day	25% 14% 34% 21% 7% 1	572
June	1st to 10th	Day	27% 11% 34% 21% 7%	680
	11th to 20th	Day	21% 16% 32% 21% 7% 2	680
	21st to end	Day	22% 10% 30% 26% 10% 2	680
July	1st to 10th	Day	18% 12% 33% 27% 9% 2	671
	11th to 20th	Day	18% 11% 34% 26% 10% 1	668
	21st to end	Day	20% 8% 30% 27% 13% 3	584
August	1st to 10th	Day	20% 9% 31% 25% 10% 4	486
	11th to 20th	Day	19% 8% 24% 27% 14% 8%	479
	21st to end	Day	25% 8% 27% 21% 13% 6%	539
September	1st to 10th	Day	25% 11% 30% 21% 10% 3	490
	11th to 20th	Day	23% 7% 30% 26% 9% 4	490
	21st to end	Day	30% 10% 25% 21% 13% 2	490
October	1st to 10th	Day	31% 11% 30% 18% 8% 3	490
	11th to 20th	Day	40% 16% 26% 14% 3 1	490
	21st to end	Day	37% 14% 30% 14% 4 1	445
November	1st to 10th	Day	37% 16% 40% 7% 2	200
	11th to 20th	Day	28% 15% 39% 16% 2 1	200
	21st to end	Day	48% 12% 28% 9% 4 1	200
December	1st to 10th	Day	27% 14% 31% 20% 8% 1	196
	11th to 20th	Day	25% 18% 38% 11% 7% 1	180
	21st to end	Day	31% 13% 36% 13% 7% 1	198
January	1st to 10th	Night	26% 12% 33% 23% 6% 1	950
	11th to 20th	Night	26% 13% 32% 23% 6%	950
	21st to end	Night	18% 11% 29% 29% 12% 1	853
February	1st to 10th	Night	19% 13% 36% 25% 7%	760
	11th to 20th	Night	21% 12% 35% 26% 6%	743
	21st to end	Night	22% 16% 36% 21% 6%	628
March	1st to 10th	Night	21% 17% 30% 24% 6% 1	760
	11th to 20th	Night	25% 17% 29% 24% 4 1	760
	21st to end	Night	20% 12% 36% 25% 5% 1	836
April	1st to 10th	Night	28% 11% 31% 22% 8% 1	760
	11th to 20th	Night	23% 15% 28% 24% 9% 1	636
	21st to end	Night	24% 8% 32% 28% 7% 1	570
May	1st to 10th	Night	23% 7% 33% 26% 10% 1	380
	11th to 20th	Night	24% 9% 29% 29% 8% 2	374
	21st to end	Night	22% 9% 29% 32% 7%	411
June	1st to 10th	Night	24% 6% 33% 28% 8% 1	380
	11th to 20th	Night	21% 9% 28% 33% 9%	380
	21st to end	Night	18% 9% 25% 36% 12%	380
July	1st to 10th	Night	20% 6% 28% 34% 11% 1	370
	11th to 20th	Night	18% 5% 25% 41% 11% 1	368
	21st to end	Night	16% 6% 23% 41% 12% 1	416
August	1st to 10th	Night	20% 5% 24% 32% 18% 2	462
	11th to 20th	Night	18% 4 24% 29% 22% 2	564
	21st to end	Night	24% 8% 22% 29% 15% 2	670
September	1st to 10th	Night	24% 8% 27% 28% 12% 1	760
	11th to 20th	Night	24% 8% 26% 27% 13% 1	760
	21st to end	Night	27% 8% 22% 30% 13% 1	760
October	1st to 10th	Night	28% 11% 24% 26% 10% 1	760
	11th to 20th	Night	37% 12% 27% 16% 7% 1	760
	21st to end	Night	36% 11% 28% 20% 5% 1	836
November	1st to 10th	Night	32% 11% 33% 18% 6% 1	780
	11th to 20th	Night	31% 15% 30% 18% 6%	800
	21st to end	Night	33% 15% 31% 15% 4 1	800
December	1st to 10th	Night	29% 14% 29% 21% 7% 1	795
	11th to 20th	Night	29% 12% 32% 19% 7% 1	950
	21st to end	Night	28% 16% 26% 21% 8% 2	1045

Page generated at 2024-12-06 03:54:47. Version ac07

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