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 2025-01-22.

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%	105282
	Night	18% 12% 4 9% 5% 4 4 3 5% 6% 30%	104105
Transparency	Day	50% 6% 13% 22% 9% 1	108745
	Night	54% 5% 11% 19% 10% 1	108731
Seeing	Day	22% 13% 29% 22% 11% 3	14774
	Night	24% 11% 29% 26% 10% 1	23863

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% 17% 6% 12% 7% 5% 4 2 4 4 21%	2597
	11th to 20th	Day	15% 14% 6% 12% 8% 5% 6% 4 5% 5% 22%	2600
	21st to end	Day	16% 18% 5% 10% 5% 5% 5% 4 5% 7% 20%	2780
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	15% 7% 3 8% 4 5% 6% 4 6% 9% 33%	4423
	11th to 20th	Day	13% 6% 3 7% 5% 4 4 3 6% 8% 40%	3979
	21st to end	Day	14% 5% 3 6% 4 4 4 4 6% 8% 42%	4180
September	1st to 10th	Day	12% 6% 2 5% 4 5% 4 4 6% 8% 44%	2280
	11th to 20th	Day	15% 6% 2 5% 3 3 4 3 5% 7% 48%	2195
	21st to end	Day	15% 5% 2 7% 5% 4 4 4 6% 8% 40%	2090
October	1st to 10th	Day	20% 7% 3 7% 6% 4 5% 4 6% 7% 32%	1971
	11th to 20th	Day	18% 8% 3 7% 5% 6% 5% 5% 6% 7% 30%	1857
	21st to end	Day	26% 9% 3 7% 5% 4 4 3 5% 5% 29%	1881
November	1st to 10th	Day	18% 12% 2 7% 4 4 4 4 5% 6% 32%	1761
	11th to 20th	Day	16% 12% 4 8% 5% 6% 5% 4 6% 5% 28%	1738
	21st to end	Day	22% 14% 5% 8% 6% 5% 4 4 5% 6% 21%	1600
December	1st to 10th	Day	19% 19% 7% 12% 6% 4 4 3 5% 5% 15%	2600
	11th to 20th	Day	18% 13% 5% 10% 5% 6% 6% 5% 6% 5% 22%	2986
	21st to end	Day	23% 14% 4 11% 5% 5% 5% 5% 6% 4 18%	3960
January	1st to 10th	Night	17% 17% 6% 12% 6% 5% 5% 3 4 5% 20%	4569
	11th to 20th	Night	12% 14% 5% 14% 8% 7% 6% 5% 6% 6% 18%	4580
	21st to end	Night	19% 17% 5% 10% 7% 5% 4 2 4 4 23%	4899
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	16% 8% 3 8% 4 4 5% 3 5% 6% 37%	2506
	11th to 20th	Night	15% 7% 3 8% 4 4 5% 4 5% 7% 37%	2814
	21st to end	Night	15% 6% 2 6% 5% 4 4 4 5% 8% 41%	3476
September	1st to 10th	Night	12% 6% 2 7% 5% 4 4 4 5% 6% 45%	1900
	11th to 20th	Night	14% 6% 2 6% 4 4 4 3 5% 6% 47%	1985
	21st to end	Night	17% 7% 2 6% 4 4 4 3 5% 6% 42%	2090
October	1st to 10th	Night	19% 7% 2 7% 4 4 5% 3 5% 6% 37%	2207
	11th to 20th	Night	22% 7% 2 8% 5% 4 5% 4 5% 6% 33%	2323
	21st to end	Night	23% 10% 3 9% 5% 5% 4 3 4 5% 29%	2717
November	1st to 10th	Night	20% 10% 3 8% 5% 4 4 4 5% 6% 30%	2537
	11th to 20th	Night	19% 10% 4 8% 6% 4 5% 3 4 5% 33%	2660
	21st to end	Night	21% 13% 4 10% 5% 5% 5% 4 5% 4 24%	2800
December	1st to 10th	Night	18% 20% 6% 12% 6% 5% 5% 4 4 4 15%	4580
	11th to 20th	Night	21% 14% 5% 10% 6% 4 3 4 4 5% 24%	5208
	21st to end	Night	24% 15% 5% 9% 5% 3 4 4 6% 5% 19%	6996

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	66% 6% 13% 13% 2	2598
	11th to 20th	Day	65% 5% 13% 11% 5%	2600
	21st to end	Day	63% 9% 14% 10% 4 1	2780
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	48% 6% 16% 22% 8%	4409
	11th to 20th	Day	40% 6% 19% 28% 6%	4021
	21st to end	Day	40% 5% 19% 22% 15%	4180
September	1st to 10th	Day	37% 7% 14% 28% 13%	2280
	11th to 20th	Day	37% 5% 12% 32% 14% 1	2195
	21st to end	Day	42% 6% 14% 27% 10% 1	2090
October	1st to 10th	Day	44% 6% 13% 29% 8%	3270
	11th to 20th	Day	42% 7% 18% 26% 7%	3060
	21st to end	Day	47% 3 18% 24% 7%	3081
November	1st to 10th	Day	51% 6% 13% 22% 8% 1	1761
	11th to 20th	Day	55% 6% 11% 17% 11% 1	1738
	21st to end	Day	62% 7% 13% 14% 4	1600
December	1st to 10th	Day	71% 5% 11% 13% 2	2600
	11th to 20th	Day	62% 6% 9% 15% 7%	2986
	21st to end	Day	67% 5% 10% 13% 5%	3960
January	1st to 10th	Night	66% 6% 14% 11% 4	4569
	11th to 20th	Night	65% 7% 11% 13% 4	4580
	21st to end	Night	66% 4 11% 12% 6%	4899
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	47% 6% 13% 25% 9%	2496
	11th to 20th	Night	45% 6% 19% 22% 8%	2838
	21st to end	Night	41% 5% 15% 23% 15% 1	3476
September	1st to 10th	Night	38% 7% 12% 27% 15% 1	1900
	11th to 20th	Night	37% 5% 13% 32% 12% 1	1985
	21st to end	Night	42% 6% 12% 24% 15% 1	2090
October	1st to 10th	Night	45% 5% 14% 26% 10%	3688
	11th to 20th	Night	45% 5% 11% 28% 10%	3859
	21st to end	Night	50% 4 13% 20% 11% 1	4467
November	1st to 10th	Night	54% 5% 11% 20% 9% 1	2537
	11th to 20th	Night	54% 5% 10% 19% 10% 1	2660
	21st to end	Night	61% 6% 12% 16% 5%	2800
December	1st to 10th	Night	73% 4 11% 10% 2	4580
	11th to 20th	Night	64% 4 8% 14% 10%	5208
	21st to end	Night	66% 4 8% 13% 8%	6996

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% 29% 16% 9% 1	200
	11th to 20th	Day	27% 23% 32% 16% 3 1	200
	21st to end	Day	24% 15% 37% 18% 6% 2	200
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	14% 6% 24% 31% 16% 9%	479
	21st to end	Day	15% 10% 24% 24% 18% 8%	539
September	1st to 10th	Day	13% 7% 28% 26% 18% 8%	490
	11th to 20th	Day	15% 8% 19% 23% 22% 12%	490
	21st to end	Day	16% 8% 29% 22% 19% 6%	490
October	1st to 10th	Day	21% 11% 28% 21% 13% 6%	490
	11th to 20th	Day	21% 17% 30% 19% 11% 2	467
	21st to end	Day	33% 12% 27% 21% 7%	429
November	1st to 10th	Day	30% 14% 25% 22% 8% 1	395
	11th to 20th	Day	25% 21% 29% 17% 6% 1	338
	21st to end	Day	29% 20% 29% 18% 5% 1	200
December	1st to 10th	Day	31% 11% 30% 20% 7% 2	200
	11th to 20th	Day	26% 23% 32% 17% 3	200
	21st to end	Day	30% 17% 29% 18% 4 3	220
January	1st to 10th	Night	28% 13% 35% 19% 5%	800
	11th to 20th	Night	26% 13% 35% 21% 5%	800
	21st to end	Night	21% 14% 33% 25% 6% 1	841
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% 22% 35% 21% 2	577
	21st to end	Night	16% 5% 21% 36% 20% 1	836
September	1st to 10th	Night	14% 4 27% 36% 17% 1	760
	11th to 20th	Night	16% 5% 20% 33% 23% 3	760
	21st to end	Night	20% 6% 26% 28% 17% 3	760
October	1st to 10th	Night	22% 9% 26% 26% 16% 1	760
	11th to 20th	Night	26% 8% 29% 27% 9%	760
	21st to end	Night	27% 10% 32% 26% 5%	836
November	1st to 10th	Night	26% 16% 27% 23% 8% 1	780
	11th to 20th	Night	25% 15% 29% 21% 10% 1	800
	21st to end	Night	30% 13% 30% 19% 8% 1	800
December	1st to 10th	Night	31% 14% 30% 20% 4	800
	11th to 20th	Night	31% 15% 30% 17% 6% 1	800
	21st to end	Night	34% 15% 28% 18% 5% 1	880

Page generated at 2025-01-19 03:06:47. Version ac07

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