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 2026-05-17.

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% 10% 4 8% 5% 5% 5% 4 6% 7% 31%	131959
	Night	17% 12% 4 10% 6% 5% 5% 4 5% 6% 29%	130874
Transparency	Day	52% 5% 12% 21% 9% 1	135404
	Night	56% 5% 10% 19% 10% 1	135516
Seeing	Day	22% 13% 29% 22% 11% 3	16462
	Night	24% 11% 29% 26% 9% 1	25529

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% 18% 7% 14% 7% 6% 4 2 4 5% 18%	4661
	11th to 20th	Day	12% 15% 6% 15% 8% 6% 5% 4 5% 5% 20%	4650
	21st to end	Day	11% 14% 5% 10% 8% 7% 7% 4 5% 6% 22%	5124
February	1st to 10th	Day	15% 15% 4 13% 6% 5% 4 4 5% 5% 24%	1848
	11th to 20th	Day	14% 11% 5% 11% 6% 6% 5% 4 5% 6% 26%	1963
	21st to end	Day	17% 15% 4 8% 7% 5% 5% 3 5% 6% 25%	1730
March	1st to 10th	Day	18% 12% 5% 10% 6% 5% 5% 4 5% 6% 25%	4576
	11th to 20th	Day	12% 13% 4 9% 6% 5% 5% 4 5% 7% 30%	4794
	21st to end	Day	18% 9% 3 9% 5% 4 5% 3 4 5% 34%	6102
April	1st to 10th	Day	22% 11% 3 7% 5% 3 4 3 5% 6% 31%	2520
	11th to 20th	Day	20% 9% 3 7% 4 4 4 3 5% 6% 35%	2494
	21st to end	Day	22% 9% 3 6% 6% 4 4 3 5% 6% 32%	2688
May	1st to 10th	Day	26% 11% 4 9% 5% 4 4 4 5% 6% 22%	6360
	11th to 20th	Day	20% 9% 3 7% 5% 5% 5% 4 6% 8% 30%	6402
	21st to end	Day	20% 9% 3 7% 4 5% 5% 4 6% 7% 31%	6949
June	1st to 10th	Day	20% 8% 3 6% 4 5% 5% 4 7% 8% 31%	2800
	11th to 20th	Day	15% 6% 2 7% 5% 5% 4 5% 7% 8% 38%	2800
	21st to end	Day	21% 7% 3 7% 5% 5% 4 4 5% 7% 33%	2800
July	1st to 10th	Day	11% 7% 3 9% 5% 6% 6% 5% 6% 8% 33%	6360
	11th to 20th	Day	10% 5% 2 6% 5% 6% 5% 5% 7% 9% 41%	6360
	21st to end	Day	11% 6% 2 5% 4 4 5% 3 7% 10% 43%	6926
August	1st to 10th	Day	14% 7% 3 8% 4 5% 6% 4 6% 9% 34%	4563
	11th to 20th	Day	13% 6% 3 7% 5% 4 4 3 6% 8% 40%	4107
	21st to end	Day	14% 6% 3 6% 4 4 4 4 6% 8% 42%	4312
September	1st to 10th	Day	11% 5% 2 5% 4 5% 4 4 6% 8% 45%	2400
	11th to 20th	Day	14% 6% 2 5% 3 3 4 3 5% 7% 49%	2310
	21st to end	Day	15% 6% 2 7% 5% 4 4 4 6% 7% 40%	2200
October	1st to 10th	Day	19% 7% 3 6% 6% 4 5% 4 6% 7% 34%	2075
	11th to 20th	Day	17% 8% 3 7% 5% 6% 5% 5% 6% 7% 31%	1955
	21st to end	Day	26% 9% 3 7% 5% 4 4 3 5% 5% 28%	1980
November	1st to 10th	Day	18% 13% 2 8% 4 4 4 4 5% 6% 31%	1851
	11th to 20th	Day	16% 13% 4 8% 5% 6% 5% 4 7% 5% 27%	1825
	21st to end	Day	22% 14% 5% 9% 6% 5% 4 4 5% 6% 20%	1680
December	1st to 10th	Day	18% 20% 7% 12% 6% 4 4 3 5% 5% 16%	2680
	11th to 20th	Day	18% 13% 5% 10% 5% 5% 6% 5% 6% 5% 22%	3066
	21st to end	Day	22% 14% 4 11% 5% 5% 5% 5% 6% 4 18%	4048
January	1st to 10th	Night	13% 19% 8% 16% 6% 4 4 3 4 4 19%	8234
	11th to 20th	Night	12% 16% 7% 17% 8% 6% 6% 4 5% 5% 15%	8235
	21st to end	Night	12% 14% 4 12% 8% 7% 6% 3 5% 5% 23%	9057
February	1st to 10th	Night	14% 15% 6% 13% 7% 5% 5% 3 4 6% 21%	2770
	11th to 20th	Night	14% 12% 4 11% 6% 6% 5% 4 5% 6% 27%	2541
	21st to end	Night	16% 14% 4 10% 5% 4 4 3 4 5% 30%	2076
March	1st to 10th	Night	20% 13% 3 8% 6% 4 4 3 4 4 30%	5484
	11th to 20th	Night	15% 14% 4 8% 5% 5% 5% 4 5% 7% 29%	5367
	21st to end	Night	15% 13% 4 11% 6% 5% 5% 3 5% 5% 30%	5072
April	1st to 10th	Night	24% 11% 3 7% 5% 4 4 3 5% 5% 29%	2100
	11th to 20th	Night	24% 11% 3 7% 5% 4 4 4 4 6% 30%	2075
	21st to end	Night	20% 11% 3 8% 4 4 4 3 4 5% 35%	1931
May	1st to 10th	Night	26% 11% 3 8% 5% 4 4 4 5% 6% 24%	3844
	11th to 20th	Night	23% 9% 4 8% 5% 4 4 3 4 6% 30%	3623
	21st to end	Night	18% 9% 4 8% 5% 5% 5% 4 5% 7% 31%	3926
June	1st to 10th	Night	21% 8% 2 7% 4 5% 5% 4 6% 8% 30%	1600
	11th to 20th	Night	17% 5% 3 6% 5% 4 5% 4 6% 8% 38%	1600
	21st to end	Night	18% 7% 3 6% 5% 5% 5% 4 6% 6% 34%	1600
July	1st to 10th	Night	13% 7% 3 7% 5% 5% 5% 4 7% 9% 35%	3600
	11th to 20th	Night	13% 6% 3 6% 5% 4 5% 4 6% 8% 41%	3600
	21st to end	Night	10% 6% 3 7% 5% 5% 5% 4 6% 8% 41%	3926
August	1st to 10th	Night	15% 8% 3 7% 4 4 5% 3 5% 6% 38%	2586
	11th to 20th	Night	14% 7% 3 8% 5% 4 5% 4 5% 7% 38%	2905
	21st to end	Night	15% 6% 2 6% 5% 4 4 4 5% 8% 41%	3586
September	1st to 10th	Night	12% 6% 3 7% 5% 4 4 4 5% 6% 45%	2000
	11th to 20th	Night	13% 6% 2 6% 4 4 4 3 5% 6% 48%	2090
	21st to end	Night	17% 7% 2 6% 4 4 4 3 5% 6% 42%	2200
October	1st to 10th	Night	19% 7% 2 7% 4 3 5% 3 5% 6% 39%	2323
	11th to 20th	Night	21% 7% 2 8% 5% 4 5% 4 5% 6% 34%	2445
	21st to end	Night	22% 10% 3 8% 5% 5% 4 3 4 6% 29%	2860
November	1st to 10th	Night	21% 10% 4 8% 4 4 4 4 5% 6% 30%	2667
	11th to 20th	Night	19% 10% 4 8% 6% 4 5% 3 4 5% 32%	2793
	21st to end	Night	21% 14% 4 11% 6% 5% 5% 4 5% 4 23%	2940
December	1st to 10th	Night	18% 20% 6% 12% 7% 5% 5% 4 4 4 15%	4720
	11th to 20th	Night	21% 14% 5% 10% 6% 4 3 4 4 5% 23%	5348
	21st to end	Night	24% 15% 5% 9% 5% 3 4 4 6% 5% 20%	7150

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	69% 4 11% 13% 2	4662
	11th to 20th	Day	67% 4 8% 12% 8% 1	4680
	21st to end	Day	60% 6% 11% 11% 11% 1	5124
February	1st to 10th	Day	63% 4 9% 17% 6% 1	1848
	11th to 20th	Day	58% 5% 11% 19% 6% 1	1972
	21st to end	Day	60% 4 10% 16% 8% 1	1730
March	1st to 10th	Day	59% 5% 8% 15% 10% 3	4579
	11th to 20th	Day	54% 4 16% 15% 10% 1	4794
	21st to end	Day	53% 4 7% 18% 16% 1	6102
April	1st to 10th	Day	55% 4 8% 20% 11% 1	2520
	11th to 20th	Day	51% 4 7% 21% 15% 1	2494
	21st to end	Day	52% 5% 9% 20% 12% 3	2688
May	1st to 10th	Day	63% 5% 8% 16% 8% 1	6371
	11th to 20th	Day	51% 7% 13% 19% 9% 1	6406
	21st to end	Day	51% 6% 11% 21% 10% 1	6949
June	1st to 10th	Day	51% 6% 11% 19% 12% 1	2800
	11th to 20th	Day	42% 6% 12% 24% 14% 2	2800
	21st to end	Day	50% 7% 11% 21% 9% 1	2800
July	1st to 10th	Day	47% 5% 14% 24% 10%	6290
	11th to 20th	Day	38% 6% 14% 31% 12%	6285
	21st to end	Day	37% 5% 13% 37% 8%	6728
August	1st to 10th	Day	47% 6% 16% 23% 8%	4549
	11th to 20th	Day	40% 6% 18% 28% 7%	4149
	21st to end	Day	40% 4 19% 22% 14%	4312
September	1st to 10th	Day	37% 6% 14% 30% 13%	2400
	11th to 20th	Day	36% 5% 12% 33% 14% 1	2310
	21st to end	Day	42% 6% 14% 26% 11% 1	2200
October	1st to 10th	Day	43% 6% 13% 29% 9%	3374
	11th to 20th	Day	42% 6% 18% 26% 7%	3158
	21st to end	Day	48% 3 17% 24% 7%	3180
November	1st to 10th	Day	52% 6% 12% 21% 8% 1	1851
	11th to 20th	Day	55% 6% 11% 16% 10%	1825
	21st to end	Day	63% 7% 13% 13% 5%	1680
December	1st to 10th	Day	71% 4 10% 13% 2	2680
	11th to 20th	Day	62% 6% 10% 15% 7%	3066
	21st to end	Day	67% 5% 10% 13% 5%	4048
January	1st to 10th	Night	69% 4 10% 12% 4	8234
	11th to 20th	Night	70% 5% 7% 12% 6%	8280
	21st to end	Night	63% 3 8% 14% 12%	9057
February	1st to 10th	Night	65% 4 9% 16% 6% 1	2770
	11th to 20th	Night	58% 4 11% 18% 8%	2543
	21st to end	Night	57% 4 9% 17% 11% 1	2076
March	1st to 10th	Night	58% 4 7% 16% 12% 4	5494
	11th to 20th	Night	55% 5% 13% 16% 10% 1	5368
	21st to end	Night	56% 4 6% 22% 11% 2	5072
April	1st to 10th	Night	57% 4 7% 18% 12% 1	2100
	11th to 20th	Night	55% 5% 8% 18% 12% 1	2075
	21st to end	Night	52% 5% 7% 18% 14% 4	1931
May	1st to 10th	Night	60% 6% 9% 17% 7% 2	3850
	11th to 20th	Night	54% 5% 9% 21% 10% 1	3624
	21st to end	Night	51% 6% 9% 19% 13% 1	3927
June	1st to 10th	Night	51% 6% 10% 20% 12% 1	1600
	11th to 20th	Night	43% 6% 13% 21% 14% 2	1600
	21st to end	Night	47% 7% 12% 20% 12% 1	1600
July	1st to 10th	Night	45% 4 18% 23% 10%	3560
	11th to 20th	Night	39% 5% 15% 28% 12%	3552
	21st to end	Night	41% 5% 14% 28% 12%	3809
August	1st to 10th	Night	46% 6% 14% 26% 9%	2576
	11th to 20th	Night	44% 6% 18% 22% 9%	2929
	21st to end	Night	41% 5% 14% 24% 15% 1	3586
September	1st to 10th	Night	38% 7% 12% 29% 14% 1	2000
	11th to 20th	Night	37% 5% 12% 32% 13% 1	2090
	21st to end	Night	43% 6% 11% 24% 15% 1	2200
October	1st to 10th	Night	44% 5% 14% 26% 11%	3804
	11th to 20th	Night	45% 5% 11% 28% 11%	3981
	21st to end	Night	50% 4 13% 21% 11% 1	4610
November	1st to 10th	Night	54% 5% 11% 20% 8% 1	2667
	11th to 20th	Night	54% 5% 11% 20% 10% 1	2793
	21st to end	Night	62% 6% 12% 16% 5%	2940
December	1st to 10th	Night	73% 4 11% 10% 2	4720
	11th to 20th	Night	64% 4 8% 14% 9%	5348
	21st to end	Night	66% 4 8% 13% 8%	7150

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	28% 16% 29% 17% 9%	220
	11th to 20th	Day	27% 25% 30% 15% 3 1	220
	21st to end	Day	21% 17% 36% 19% 6% 1	242
February	1st to 10th	Day	29% 19% 37% 13% 3	308
	11th to 20th	Day	22% 22% 37% 17% 2	451
	21st to end	Day	26% 17% 32% 22% 3	446
March	1st to 10th	Day	26% 16% 32% 20% 6%	540
	11th to 20th	Day	25% 18% 34% 17% 5% 2	540
	21st to end	Day	30% 16% 30% 16% 8% 1	594
April	1st to 10th	Day	30% 18% 29% 16% 6% 1	540
	11th to 20th	Day	30% 18% 27% 14% 8% 2	532
	21st to end	Day	28% 12% 33% 16% 9% 2	540
May	1st to 10th	Day	28% 14% 31% 17% 8% 1	543
	11th to 20th	Day	20% 11% 33% 21% 11% 3	551
	21st to end	Day	20% 12% 29% 25% 10% 2	573
June	1st to 10th	Day	24% 12% 25% 27% 10% 2	530
	11th to 20th	Day	15% 12% 30% 28% 13% 2	530
	21st to end	Day	23% 11% 30% 23% 11% 3	530
July	1st to 10th	Day	13% 7% 30% 28% 18% 5%	525
	11th to 20th	Day	14% 6% 32% 28% 16% 4	524
	21st to end	Day	14% 7% 29% 30% 17% 3	576
August	1st to 10th	Day	13% 6% 24% 32% 19% 6%	526
	11th to 20th	Day	13% 6% 24% 31% 15% 10%	519
	21st to end	Day	16% 10% 24% 24% 18% 8%	583
September	1st to 10th	Day	13% 8% 28% 25% 19% 8%	530
	11th to 20th	Day	14% 8% 18% 24% 23% 13%	530
	21st to end	Day	17% 9% 29% 22% 18% 6%	530
October	1st to 10th	Day	20% 10% 28% 21% 14% 6%	530
	11th to 20th	Day	20% 17% 30% 20% 11% 2	505
	21st to end	Day	32% 12% 27% 22% 7%	462
November	1st to 10th	Day	32% 15% 24% 21% 8% 1	425
	11th to 20th	Day	25% 21% 29% 18% 6% 2	365
	21st to end	Day	29% 23% 28% 16% 4	220
December	1st to 10th	Day	29% 14% 30% 20% 7% 1	220
	11th to 20th	Day	26% 22% 34% 16% 2	220
	21st to end	Day	29% 17% 30% 19% 3 2	242
January	1st to 10th	Night	27% 13% 35% 20% 5%	840
	11th to 20th	Night	27% 14% 34% 20% 5%	840
	21st to end	Night	20% 15% 34% 25% 6% 1	924
February	1st to 10th	Night	21% 13% 37% 23% 5%	840
	11th to 20th	Night	24% 15% 36% 23% 3	823
	21st to end	Night	24% 14% 35% 23% 4	692
March	1st to 10th	Night	26% 15% 31% 22% 5%	840
	11th to 20th	Night	27% 15% 31% 21% 6%	840
	21st to end	Night	26% 15% 28% 23% 8%	924
April	1st to 10th	Night	30% 13% 28% 24% 4	840
	11th to 20th	Night	30% 14% 27% 22% 5%	831
	21st to end	Night	26% 14% 29% 22% 9%	671
May	1st to 10th	Night	28% 10% 28% 26% 8% 1	499
	11th to 20th	Night	21% 10% 32% 28% 8% 1	406
	21st to end	Night	18% 9% 31% 32% 11%	433
June	1st to 10th	Night	24% 8% 27% 32% 8% 1	400
	11th to 20th	Night	21% 5% 29% 33% 12% 1	400
	21st to end	Night	20% 6% 27% 33% 14% 1	400
July	1st to 10th	Night	13% 4 30% 35% 18%	390
	11th to 20th	Night	9% 4 27% 41% 18% 1	388
	21st to end	Night	12% 3 26% 44% 15% 1	438
August	1st to 10th	Night	14% 4 17% 44% 21% 1	398
	11th to 20th	Night	14% 5% 22% 35% 22% 2	608
	21st to end	Night	16% 5% 21% 37% 20% 1	880
September	1st to 10th	Night	14% 5% 27% 36% 18% 1	800
	11th to 20th	Night	16% 5% 19% 34% 24% 3	800
	21st to end	Night	20% 6% 27% 28% 16% 3	800
October	1st to 10th	Night	22% 9% 26% 27% 16% 1	800
	11th to 20th	Night	25% 9% 30% 28% 9%	800
	21st to end	Night	26% 10% 32% 27% 5%	880
November	1st to 10th	Night	27% 15% 26% 22% 8% 1	820
	11th to 20th	Night	25% 15% 29% 21% 9% 1	840
	21st to end	Night	30% 13% 30% 19% 8%	840
December	1st to 10th	Night	30% 14% 30% 21% 4	840
	11th to 20th	Night	30% 15% 30% 17% 6% 1	840
	21st to end	Night	34% 15% 28% 18% 4 1	924

Page generated at 2026-05-14 01:58:59. Version ac07

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