Saint-Remi
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saint-Remi clear sky chart from 2005-11-06 to 2024-08-15.

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% 3 8% 5% 5% 5% 4 6% 7% 32%	95633
	Night	18% 11% 4 9% 5% 4 4 3 5% 6% 30%	93104
Transparency	Day	51% 6% 12% 21% 9% 1	95352
	Night	54% 6% 11% 19% 9% 1	92939
Seeing	Day	22% 13% 29% 22% 11% 3	14297
	Night	24% 11% 29% 26% 10% 1	23226

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	17% 16% 5% 12% 7% 5% 4 2 4 4 21%	2517
	11th to 20th	Day	15% 14% 6% 12% 8% 5% 6% 4 5% 5% 22%	2520
	21st to end	Day	16% 18% 5% 10% 5% 5% 5% 4 5% 7% 21%	2772
February	1st to 10th	Day	16% 15% 4 13% 6% 5% 4 4 5% 5% 23%	1672
	11th to 20th	Day	14% 11% 5% 11% 6% 6% 5% 4 5% 6% 26%	1771
	21st to end	Day	18% 15% 3 7% 6% 4 4 3 5% 6% 26%	1570
March	1st to 10th	Day	20% 12% 5% 9% 6% 5% 4 4 4 5% 26%	3116
	11th to 20th	Day	13% 16% 5% 10% 6% 5% 5% 3 5% 6% 26%	3289
	21st to end	Day	15% 8% 3 9% 5% 4 5% 3 4 6% 39%	4166
April	1st to 10th	Day	22% 11% 3 7% 5% 4 4 3 5% 5% 32%	2280
	11th to 20th	Day	19% 9% 3 7% 4 4 4 3 5% 6% 36%	2254
	21st to end	Day	23% 9% 3 6% 5% 4 4 3 5% 6% 32%	2432
May	1st to 10th	Day	21% 10% 3 9% 5% 4 5% 4 5% 6% 28%	4345
	11th to 20th	Day	17% 9% 4 7% 5% 5% 5% 4 6% 8% 32%	4398
	21st to end	Day	14% 7% 3 6% 5% 5% 5% 4 7% 9% 35%	4837
June	1st to 10th	Day	21% 8% 2 6% 4 5% 5% 4 6% 8% 31%	2660
	11th to 20th	Day	15% 6% 2 7% 5% 5% 4 5% 6% 8% 38%	2660
	21st to end	Day	22% 7% 3 7% 5% 5% 5% 4 5% 7% 33%	2660
July	1st to 10th	Day	11% 6% 2 8% 5% 6% 6% 5% 6% 9% 37%	4440
	11th to 20th	Day	12% 5% 2 5% 5% 6% 5% 5% 8% 9% 37%	4440
	21st to end	Day	12% 6% 2 5% 5% 4 5% 4 6% 8% 42%	4814
August	1st to 10th	Day	13% 6% 3 7% 4 5% 6% 4 6% 9% 37%	2646
	11th to 20th	Day	10% 6% 2 7% 4 4 4 4 7% 9% 42%	2327
	21st to end	Day	12% 6% 3 6% 5% 5% 4 4 6% 8% 42%	2376
September	1st to 10th	Day	12% 6% 2 6% 4 5% 4 4 6% 8% 43%	2160
	11th to 20th	Day	15% 6% 2 5% 2 3 4 3 6% 7% 47%	2080
	21st to end	Day	14% 5% 2 7% 5% 4 4 4 6% 8% 40%	1980
October	1st to 10th	Day	21% 7% 3 7% 6% 4 5% 4 6% 6% 31%	1868
	11th to 20th	Day	18% 9% 3 7% 5% 6% 5% 5% 6% 7% 29%	1760
	21st to end	Day	28% 9% 3 7% 5% 4 4 3 5% 5% 28%	1782
November	1st to 10th	Day	19% 12% 2 7% 4 4 4 4 5% 6% 32%	1671
	11th to 20th	Day	17% 12% 4 8% 5% 6% 5% 4 6% 5% 27%	1652
	21st to end	Day	22% 13% 5% 8% 5% 5% 4 4 5% 6% 21%	1520
December	1st to 10th	Day	23% 17% 6% 9% 6% 4 3 3 5% 6% 17%	1520
	11th to 20th	Day	22% 15% 6% 8% 4 5% 5% 4 5% 5% 21%	1906
	21st to end	Day	28% 15% 4 11% 5% 5% 4 2 4 4 19%	2772
January	1st to 10th	Night	17% 17% 6% 12% 6% 5% 5% 3 4 5% 20%	4429
	11th to 20th	Night	12% 14% 5% 14% 8% 7% 6% 5% 6% 6% 18%	4440
	21st to end	Night	19% 17% 5% 10% 7% 5% 4 2 4 4 23%	4884
February	1st to 10th	Night	15% 16% 5% 13% 8% 5% 5% 3 4 6% 20%	2507
	11th to 20th	Night	14% 12% 4 10% 6% 6% 5% 4 5% 6% 27%	2293
	21st to end	Night	17% 14% 4 10% 5% 4 4 3 3 5% 31%	1884
March	1st to 10th	Night	21% 11% 3 7% 5% 4 4 3 4 5% 33%	3724
	11th to 20th	Night	19% 18% 4 9% 5% 4 4 3 4 4 26%	3666
	21st to end	Night	13% 12% 3 9% 5% 5% 4 3 5% 5% 36%	3466
April	1st to 10th	Night	23% 11% 3 7% 5% 5% 4 3 5% 5% 29%	1900
	11th to 20th	Night	24% 10% 3 6% 4 4 4 4 4 6% 31%	1875
	21st to end	Night	20% 11% 3 8% 4 4 4 3 4 5% 34%	1747
May	1st to 10th	Night	22% 11% 3 7% 4 4 4 4 5% 6% 29%	2624
	11th to 20th	Night	21% 9% 3 7% 5% 4 3 3 4 6% 35%	2495
	21st to end	Night	16% 7% 3 6% 5% 4 5% 4 5% 8% 37%	2738
June	1st to 10th	Night	22% 8% 2 7% 5% 4 5% 4 6% 8% 30%	1520
	11th to 20th	Night	17% 5% 2 6% 5% 4 5% 3 6% 8% 38%	1520
	21st to end	Night	18% 7% 3 6% 5% 5% 5% 4 6% 6% 34%	1520
July	1st to 10th	Night	14% 8% 3 7% 6% 5% 4 4 6% 8% 35%	2520
	11th to 20th	Night	13% 6% 2 5% 5% 4 5% 4 7% 8% 41%	2520
	21st to end	Night	11% 7% 3 7% 5% 4 4 4 6% 8% 40%	2739
August	1st to 10th	Night	13% 6% 3 5% 4 4 5% 4 6% 8% 43%	1512
	11th to 20th	Night	13% 6% 2 7% 4 3 6% 4 6% 8% 42%	1651
	21st to end	Night	13% 6% 2 6% 5% 5% 4 4 5% 7% 44%	1980
September	1st to 10th	Night	13% 6% 3 8% 5% 4 4 3 5% 6% 43%	1800
	11th to 20th	Night	15% 6% 2 6% 4 4 4 3 5% 6% 46%	1880
	21st to end	Night	17% 7% 2 6% 4 4 4 3 5% 6% 42%	1980
October	1st to 10th	Night	19% 7% 2 7% 4 4 5% 3 5% 6% 36%	2090
	11th to 20th	Night	22% 8% 2 8% 5% 4 5% 4 5% 6% 32%	2200
	21st to end	Night	23% 10% 3 8% 5% 5% 4 3 4 5% 28%	2574
November	1st to 10th	Night	20% 10% 3 8% 5% 5% 4 4 5% 6% 30%	2407
	11th to 20th	Night	20% 10% 4 8% 6% 4 5% 3 5% 5% 32%	2527
	21st to end	Night	21% 14% 4 10% 5% 5% 4 4 5% 4 24%	2660
December	1st to 10th	Night	22% 18% 6% 10% 6% 5% 4 3 4 5% 17%	2660
	11th to 20th	Night	23% 16% 5% 9% 6% 4 3 3 4 4 23%	3288
	21st to end	Night	28% 16% 5% 10% 5% 3 4 3 3 4 20%	4884

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% 6% 13% 13% 2	2518
	11th to 20th	Day	64% 5% 14% 11% 5%	2520
	21st to end	Day	63% 9% 14% 10% 4 1	2772
February	1st to 10th	Day	64% 4 10% 16% 4 1	1672
	11th to 20th	Day	58% 6% 12% 18% 6% 1	1780
	21st to end	Day	59% 4 11% 16% 8% 1	1570
March	1st to 10th	Day	59% 6% 9% 19% 6% 1	3119
	11th to 20th	Day	59% 5% 12% 14% 10% 1	3289
	21st to end	Day	46% 5% 9% 22% 17% 2	4166
April	1st to 10th	Day	55% 4 8% 21% 11% 2	2280
	11th to 20th	Day	49% 4 8% 22% 15% 1	2254
	21st to end	Day	53% 5% 9% 19% 11% 3	2432
May	1st to 10th	Day	54% 6% 9% 19% 10% 1	4359
	11th to 20th	Day	48% 9% 13% 20% 9% 1	4402
	21st to end	Day	43% 8% 12% 24% 12% 2	4837
June	1st to 10th	Day	51% 6% 11% 19% 12% 1	2660
	11th to 20th	Day	43% 6% 12% 24% 13% 2	2660
	21st to end	Day	50% 7% 12% 21% 9% 1	2660
July	1st to 10th	Day	42% 5% 15% 27% 10% 1	4370
	11th to 20th	Day	39% 6% 16% 32% 7%	4365
	21st to end	Day	39% 6% 13% 33% 9%	4661
August	1st to 10th	Day	43% 8% 17% 24% 8%	2632
	11th to 20th	Day	35% 8% 18% 28% 10%	2327
	21st to end	Day	39% 6% 15% 25% 13% 1	2376
September	1st to 10th	Day	38% 7% 14% 27% 13%	2160
	11th to 20th	Day	37% 5% 12% 33% 13% 1	2080
	21st to end	Day	41% 6% 15% 27% 9% 1	1980
October	1st to 10th	Day	51% 7% 12% 21% 9%	1868
	11th to 20th	Day	51% 8% 15% 19% 7%	1760
	21st to end	Day	60% 4 12% 17% 7% 1	1782
November	1st to 10th	Day	51% 6% 13% 21% 8% 1	1671
	11th to 20th	Day	57% 6% 11% 15% 10% 1	1652
	21st to end	Day	62% 7% 13% 14% 4	1520
December	1st to 10th	Day	68% 5% 11% 12% 3	1520
	11th to 20th	Day	64% 7% 11% 14% 5%	1906
	21st to end	Day	70% 5% 12% 11% 3	2772
January	1st to 10th	Night	65% 6% 14% 11% 4	4429
	11th to 20th	Night	64% 7% 11% 13% 4	4440
	21st to end	Night	66% 4 11% 12% 6%	4884
February	1st to 10th	Night	66% 5% 9% 14% 6% 1	2507
	11th to 20th	Night	57% 5% 11% 18% 8%	2295
	21st to end	Night	56% 4 9% 17% 12% 1	1884
March	1st to 10th	Night	54% 5% 10% 20% 9% 2	3734
	11th to 20th	Night	60% 6% 7% 15% 10% 1	3667
	21st to end	Night	50% 4 6% 24% 14% 3	3466
April	1st to 10th	Night	56% 4 8% 18% 13% 1	1900
	11th to 20th	Night	54% 5% 8% 19% 13% 1	1875
	21st to end	Night	53% 5% 8% 17% 13% 4	1747
May	1st to 10th	Night	54% 7% 8% 19% 9% 3	2630
	11th to 20th	Night	49% 6% 10% 21% 11% 2	2496
	21st to end	Night	44% 7% 10% 21% 17% 2	2739
June	1st to 10th	Night	50% 7% 11% 20% 11% 1	1520
	11th to 20th	Night	43% 6% 14% 21% 14% 2	1520
	21st to end	Night	48% 7% 13% 19% 12% 1	1520
July	1st to 10th	Night	46% 5% 14% 22% 13%	2480
	11th to 20th	Night	37% 6% 17% 31% 9%	2472
	21st to end	Night	42% 6% 15% 24% 13%	2651
August	1st to 10th	Night	38% 8% 18% 25% 12%	1502
	11th to 20th	Night	39% 9% 15% 24% 13% 1	1651
	21st to end	Night	39% 7% 14% 26% 13% 1	1980
September	1st to 10th	Night	39% 7% 12% 27% 14% 1	1800
	11th to 20th	Night	38% 5% 12% 32% 12% 1	1880
	21st to end	Night	42% 6% 12% 25% 14% 1	1980
October	1st to 10th	Night	47% 6% 12% 22% 12%	2090
	11th to 20th	Night	52% 6% 11% 23% 8%	2200
	21st to end	Night	58% 6% 11% 16% 9% 1	2574
November	1st to 10th	Night	53% 5% 11% 20% 9% 1	2407
	11th to 20th	Night	54% 5% 11% 20% 9% 1	2527
	21st to end	Night	61% 6% 12% 15% 5%	2660
December	1st to 10th	Night	69% 5% 11% 12% 3	2660
	11th to 20th	Night	65% 5% 9% 15% 5%	3288
	21st to end	Night	69% 5% 10% 13% 3	4884

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	29% 17% 27% 18% 9% 1	180
	11th to 20th	Day	29% 22% 32% 13% 3 1	180
	21st to end	Day	24% 15% 37% 17% 6% 2	198
February	1st to 10th	Day	32% 19% 35% 12% 2	252
	11th to 20th	Day	23% 21% 39% 16% 2 1	379
	21st to end	Day	29% 17% 30% 22% 3	382
March	1st to 10th	Day	28% 15% 30% 21% 6%	460
	11th to 20th	Day	22% 18% 35% 16% 5% 2	460
	21st to end	Day	30% 15% 29% 17% 8% 1	506
April	1st to 10th	Day	30% 17% 29% 17% 7% 1	460
	11th to 20th	Day	29% 18% 27% 14% 9% 3	452
	21st to end	Day	29% 13% 31% 16% 9% 2	460
May	1st to 10th	Day	26% 13% 31% 18% 10% 2	463
	11th to 20th	Day	19% 12% 32% 21% 12% 4	487
	21st to end	Day	19% 13% 30% 26% 10% 2	529
June	1st to 10th	Day	25% 12% 24% 27% 10% 1	490
	11th to 20th	Day	15% 12% 29% 29% 14% 2	490
	21st to end	Day	24% 11% 29% 23% 11% 3	490
July	1st to 10th	Day	13% 7% 29% 28% 17% 6%	485
	11th to 20th	Day	15% 6% 32% 29% 15% 4	484
	21st to end	Day	14% 7% 29% 30% 17% 3	532
August	1st to 10th	Day	14% 7% 25% 31% 19% 5%	486
	11th to 20th	Day	12% 6% 24% 31% 16% 10%	456
	21st to end	Day	15% 11% 25% 23% 18% 9%	495
September	1st to 10th	Day	13% 6% 27% 27% 18% 8%	450
	11th to 20th	Day	17% 8% 21% 24% 20% 11%	450
	21st to end	Day	16% 8% 29% 22% 19% 6%	450
October	1st to 10th	Day	22% 11% 27% 20% 14% 6%	450
	11th to 20th	Day	21% 17% 29% 19% 11% 2	430
	21st to end	Day	35% 11% 27% 22% 6%	396
November	1st to 10th	Day	29% 14% 24% 22% 9% 1	365
	11th to 20th	Day	26% 21% 29% 17% 6% 1	312
	21st to end	Day	28% 18% 28% 19% 5% 1	180
December	1st to 10th	Day	31% 10% 31% 20% 7% 1	180
	11th to 20th	Day	26% 23% 31% 17% 3	180
	21st to end	Day	31% 18% 28% 18% 4 2	198
January	1st to 10th	Night	28% 13% 33% 20% 5%	760
	11th to 20th	Night	27% 13% 35% 20% 5%	760
	21st to end	Night	21% 14% 33% 25% 6% 1	836
February	1st to 10th	Night	23% 13% 36% 23% 5%	760
	11th to 20th	Night	23% 16% 36% 22% 3	743
	21st to end	Night	25% 13% 35% 23% 4	628
March	1st to 10th	Night	26% 14% 31% 24% 5%	760
	11th to 20th	Night	27% 14% 30% 22% 6%	760
	21st to end	Night	25% 14% 28% 24% 8%	836
April	1st to 10th	Night	29% 13% 28% 25% 5%	760
	11th to 20th	Night	30% 15% 27% 22% 6% 1	751
	21st to end	Night	26% 14% 29% 22% 9%	607
May	1st to 10th	Night	27% 10% 27% 26% 9% 1	451
	11th to 20th	Night	21% 9% 32% 29% 9% 1	374
	21st to end	Night	17% 8% 32% 32% 11%	411
June	1st to 10th	Night	24% 8% 26% 33% 8% 1	380
	11th to 20th	Night	21% 4 29% 33% 12% 1	380
	21st to end	Night	20% 5% 26% 34% 14% 1	380
July	1st to 10th	Night	14% 4 30% 34% 18%	370
	11th to 20th	Night	10% 4 27% 40% 17% 1	368
	21st to end	Night	12% 3 26% 43% 15% 1	416
August	1st to 10th	Night	15% 4 17% 43% 20% 1	378
	11th to 20th	Night	15% 5% 21% 35% 22% 2	557
	21st to end	Night	16% 5% 21% 35% 21% 1	792
September	1st to 10th	Night	15% 4 26% 36% 18% 1	720
	11th to 20th	Night	17% 5% 21% 34% 21% 3	720
	21st to end	Night	20% 6% 26% 29% 16% 3	720
October	1st to 10th	Night	22% 9% 26% 26% 15% 1	720
	11th to 20th	Night	26% 9% 29% 26% 10%	720
	21st to end	Night	28% 9% 32% 25% 5%	792
November	1st to 10th	Night	26% 15% 26% 23% 9% 1	740
	11th to 20th	Night	26% 15% 29% 20% 10% 1	760
	21st to end	Night	31% 12% 29% 19% 8% 1	760
December	1st to 10th	Night	32% 14% 30% 20% 4	760
	11th to 20th	Night	31% 14% 31% 16% 6% 1	760
	21st to end	Night	35% 15% 28% 17% 4	836

Page generated at 2024-08-12 09:52:48. Version ac07

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