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 2024-01-22.

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	18% 9% 4 6% 6% 3 5% 5% 5% 7% 33%	74834
	Night	19% 10% 4 7% 6% 3 5% 4 5% 6% 31%	75103
Transparency	Day	51% 6% 12% 20% 10% 1	74539
	Night	54% 6% 11% 19% 10% 1	74932
Seeing	Day	22% 12% 29% 22% 11% 3	13508
	Night	24% 11% 29% 26% 10% 1	22621

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	20% 17% 6% 10% 8% 3 5% 3 4 4 21%	1517
	11th to 20th	Day	19% 15% 6% 10% 9% 3 4 4 4 5% 22%	1520
	21st to end	Day	11% 15% 5% 7% 8% 4 6% 5% 4 7% 27%	1592
February	1st to 10th	Day	16% 15% 5% 11% 8% 4 6% 3 4 5% 23%	1584
	11th to 20th	Day	15% 10% 5% 10% 8% 4 6% 5% 5% 6% 26%	1675
	21st to end	Day	19% 14% 5% 6% 8% 4 4 4 5% 6% 26%	1480
March	1st to 10th	Day	16% 11% 5% 8% 6% 4 5% 6% 5% 5% 28%	1797
	11th to 20th	Day	16% 10% 4 6% 7% 4 4 5% 5% 7% 32%	1859
	21st to end	Day	19% 9% 4 7% 5% 3 4 4 4 6% 34%	2376
April	1st to 10th	Day	22% 10% 3 6% 6% 3 4 4 5% 5% 32%	2160
	11th to 20th	Day	19% 7% 4 6% 4 3 4 4 6% 6% 36%	2134
	21st to end	Day	23% 8% 3 5% 6% 3 4 4 5% 6% 32%	2304
May	1st to 10th	Day	20% 7% 4 7% 5% 3 4 5% 5% 7% 34%	2467
	11th to 20th	Day	17% 6% 3 5% 5% 3 5% 4 5% 7% 39%	2478
	21st to end	Day	16% 6% 3 6% 5% 3 5% 5% 6% 9% 35%	2725
June	1st to 10th	Day	22% 7% 2 5% 5% 3 5% 5% 6% 8% 31%	2520
	11th to 20th	Day	16% 5% 2 6% 5% 3 4 5% 6% 8% 39%	2520
	21st to end	Day	21% 6% 3 6% 6% 4 5% 4 5% 7% 33%	2520
July	1st to 10th	Day	13% 4 3 5% 6% 4 6% 5% 6% 8% 42%	2520
	11th to 20th	Day	13% 5% 2 4 6% 4 5% 7% 7% 9% 37%	2520
	21st to end	Day	13% 5% 3 5% 6% 4 6% 5% 7% 10% 37%	2744
August	1st to 10th	Day	13% 5% 3 6% 5% 4 6% 6% 6% 9% 38%	2506
	11th to 20th	Day	10% 6% 2 6% 5% 3 4 5% 7% 10% 42%	2269
	21st to end	Day	12% 6% 3 5% 5% 3 5% 5% 6% 8% 42%	2376
September	1st to 10th	Day	12% 5% 3 5% 5% 4 4 5% 6% 8% 43%	2160
	11th to 20th	Day	16% 6% 2 4 3 2 4 4 5% 7% 48%	2080
	21st to end	Day	14% 5% 2 6% 6% 3 4 5% 6% 8% 40%	1980
October	1st to 10th	Day	21% 7% 3 6% 6% 3 5% 5% 6% 7% 31%	1868
	11th to 20th	Day	18% 8% 4 6% 6% 4 6% 6% 6% 7% 29%	1760
	21st to end	Day	28% 8% 3 6% 5% 3 4 4 5% 5% 28%	1782
November	1st to 10th	Day	19% 11% 3 6% 5% 3 5% 5% 5% 6% 32%	1671
	11th to 20th	Day	17% 11% 5% 7% 6% 4 6% 5% 6% 5% 27%	1652
	21st to end	Day	22% 13% 5% 7% 6% 4 4 6% 5% 6% 21%	1520
December	1st to 10th	Day	23% 15% 7% 9% 7% 3 4 4 5% 6% 17%	1520
	11th to 20th	Day	22% 14% 6% 7% 5% 3 6% 5% 5% 5% 21%	1906
	21st to end	Day	28% 14% 5% 9% 6% 4 4 3 4 4 19%	2772
January	1st to 10th	Night	18% 16% 6% 10% 8% 3 6% 4 4 5% 19%	2649
	11th to 20th	Night	17% 16% 6% 10% 7% 4 6% 5% 5% 5% 21%	2660
	21st to end	Night	14% 13% 5% 9% 8% 4 5% 4 5% 5% 28%	2798
February	1st to 10th	Night	16% 14% 6% 12% 9% 4 6% 4 4 5% 19%	2375
	11th to 20th	Night	15% 11% 4 9% 7% 5% 5% 5% 5% 6% 27%	2169
	21st to end	Night	17% 13% 5% 9% 6% 3 4 4 3 5% 31%	1776
March	1st to 10th	Night	17% 14% 4 8% 6% 4 5% 4 5% 4 28%	2150
	11th to 20th	Night	19% 11% 4 7% 6% 3 5% 4 4 6% 30%	2096
	21st to end	Night	20% 10% 3 7% 5% 3 4 4 4 5% 36%	1980
April	1st to 10th	Night	24% 10% 3 7% 5% 3 4 4 5% 6% 29%	1800
	11th to 20th	Night	24% 9% 3 5% 5% 3 4 5% 3 6% 32%	1775
	21st to end	Night	21% 11% 3 7% 5% 3 4 4 4 5% 34%	1656
May	1st to 10th	Night	22% 8% 3 6% 5% 3 4 4 4 6% 34%	1508
	11th to 20th	Night	18% 7% 3 7% 5% 3 4 5% 5% 6% 37%	1415
	21st to end	Night	17% 5% 3 4 6% 3 5% 5% 5% 7% 40%	1550
June	1st to 10th	Night	22% 7% 3 6% 5% 3 5% 5% 6% 8% 30%	1440
	11th to 20th	Night	18% 5% 3 5% 6% 3 5% 4 6% 8% 38%	1440
	21st to end	Night	17% 6% 3 6% 5% 4 5% 5% 6% 7% 35%	1440
July	1st to 10th	Night	11% 5% 2 4 6% 4 5% 5% 6% 9% 43%	1440
	11th to 20th	Night	10% 5% 3 5% 6% 4 5% 6% 8% 9% 40%	1440
	21st to end	Night	12% 5% 3 5% 6% 3 5% 6% 7% 10% 39%	1574
August	1st to 10th	Night	13% 5% 3 4 4 3 5% 5% 6% 8% 44%	1432
	11th to 20th	Night	13% 5% 3 6% 5% 2 5% 4 6% 8% 42%	1610
	21st to end	Night	13% 6% 3 5% 6% 3 4 4 5% 7% 44%	1980
September	1st to 10th	Night	13% 6% 2 7% 6% 3 4 5% 5% 6% 44%	1800
	11th to 20th	Night	15% 5% 2 5% 5% 3 4 4 4 6% 46%	1880
	21st to end	Night	18% 6% 2 5% 5% 3 4 4 5% 6% 42%	1980
October	1st to 10th	Night	20% 7% 3 6% 5% 3 5% 5% 5% 6% 36%	2090
	11th to 20th	Night	22% 7% 2 7% 6% 3 5% 5% 5% 6% 32%	2200
	21st to end	Night	24% 10% 4 7% 6% 4 4 4 4 5% 28%	2574
November	1st to 10th	Night	21% 9% 4 7% 5% 4 4 5% 5% 6% 30%	2407
	11th to 20th	Night	20% 9% 4 7% 6% 3 5% 4 5% 5% 32%	2527
	21st to end	Night	22% 13% 4 9% 6% 4 5% 5% 5% 4 24%	2660
December	1st to 10th	Night	22% 17% 7% 9% 6% 4 5% 4 4 5% 17%	2660
	11th to 20th	Night	23% 15% 6% 8% 6% 3 4 4 4 4 23%	3288
	21st to end	Night	28% 15% 5% 9% 6% 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	68% 4 11% 14% 3	1518
	11th to 20th	Day	66% 5% 10% 12% 8%	1520
	21st to end	Day	56% 7% 13% 15% 8% 1	1592
February	1st to 10th	Day	65% 4 10% 15% 4 1	1584
	11th to 20th	Day	58% 6% 12% 18% 6% 1	1684
	21st to end	Day	61% 4 11% 16% 8% 1	1480
March	1st to 10th	Day	58% 6% 11% 15% 8% 2	1800
	11th to 20th	Day	53% 4 13% 17% 12% 2	1859
	21st to end	Day	52% 4 9% 20% 13% 3	2376
April	1st to 10th	Day	55% 4 8% 21% 11% 2	2160
	11th to 20th	Day	49% 5% 8% 23% 15% 2	2134
	21st to end	Day	53% 5% 9% 18% 11% 3	2304
May	1st to 10th	Day	49% 5% 9% 20% 16% 1	2467
	11th to 20th	Day	45% 6% 10% 22% 16% 2	2482
	21st to end	Day	45% 7% 12% 20% 13% 3	2725
June	1st to 10th	Day	51% 6% 11% 19% 12% 1	2520
	11th to 20th	Day	43% 6% 12% 24% 14% 2	2520
	21st to end	Day	50% 7% 12% 20% 9% 1	2520
July	1st to 10th	Day	39% 7% 13% 27% 13% 1	2450
	11th to 20th	Day	40% 7% 14% 29% 9%	2445
	21st to end	Day	42% 7% 16% 25% 9% 1	2591
August	1st to 10th	Day	42% 8% 17% 25% 8%	2492
	11th to 20th	Day	35% 8% 18% 27% 11%	2269
	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	67% 5% 11% 13% 4	2649
	11th to 20th	Night	66% 6% 10% 12% 6% 1	2660
	21st to end	Night	58% 5% 10% 16% 10% 1	2798
February	1st to 10th	Night	67% 4 9% 14% 5% 1	2375
	11th to 20th	Night	57% 4 12% 18% 8%	2171
	21st to end	Night	57% 4 9% 17% 12% 1	1776
March	1st to 10th	Night	59% 5% 10% 15% 10% 1	2160
	11th to 20th	Night	57% 4 9% 18% 10% 2	2097
	21st to end	Night	52% 4 7% 20% 12% 4	1980
April	1st to 10th	Night	57% 4 8% 18% 12% 2	1800
	11th to 20th	Night	54% 5% 8% 19% 13% 1	1775
	21st to end	Night	53% 5% 8% 17% 13% 4	1656
May	1st to 10th	Night	52% 5% 5% 17% 16% 5%	1508
	11th to 20th	Night	46% 6% 7% 19% 19% 3	1416
	21st to end	Night	43% 6% 13% 21% 15% 3	1551
June	1st to 10th	Night	50% 7% 10% 21% 10% 1	1440
	11th to 20th	Night	43% 5% 13% 21% 15% 2	1440
	21st to end	Night	46% 8% 13% 20% 12% 1	1440
July	1st to 10th	Night	36% 7% 15% 25% 16% 1	1400
	11th to 20th	Night	35% 9% 15% 30% 11%	1392
	21st to end	Night	38% 9% 17% 25% 11% 1	1486
August	1st to 10th	Night	36% 8% 19% 25% 12%	1422
	11th to 20th	Night	39% 9% 15% 24% 13% 1	1610
	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% 4 1	180
	21st to end	Day	23% 15% 39% 16% 5% 2	178
February	1st to 10th	Day	33% 21% 35% 9% 1	224
	11th to 20th	Day	24% 18% 40% 16% 2 1	343
	21st to end	Day	28% 16% 30% 22% 3	346
March	1st to 10th	Day	27% 14% 31% 21% 6%	420
	11th to 20th	Day	21% 18% 36% 16% 6% 2	420
	21st to end	Day	29% 14% 28% 18% 9% 1	462
April	1st to 10th	Day	29% 16% 30% 16% 7% 1	420
	11th to 20th	Day	28% 17% 26% 16% 10% 3	412
	21st to end	Day	29% 12% 31% 17% 10% 1	420
May	1st to 10th	Day	27% 14% 31% 18% 9% 2	423
	11th to 20th	Day	19% 13% 33% 21% 11% 3	447
	21st to end	Day	18% 13% 32% 25% 10% 3	485
June	1st to 10th	Day	26% 12% 24% 27% 10% 1	450
	11th to 20th	Day	16% 12% 29% 28% 13% 2	450
	21st to end	Day	23% 10% 28% 24% 12% 4	450
July	1st to 10th	Day	13% 7% 29% 28% 18% 6%	445
	11th to 20th	Day	15% 5% 31% 29% 15% 4	444
	21st to end	Day	15% 6% 30% 29% 17% 3	488
August	1st to 10th	Day	14% 6% 26% 29% 20% 6%	446
	11th to 20th	Day	13% 6% 24% 32% 15% 10%	439
	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	20% 14% 34% 25% 6% 1	800
February	1st to 10th	Night	23% 14% 36% 22% 5%	720
	11th to 20th	Night	23% 15% 36% 22% 3	703
	21st to end	Night	25% 14% 34% 23% 4	592
March	1st to 10th	Night	26% 14% 31% 23% 5%	720
	11th to 20th	Night	27% 14% 30% 23% 6%	720
	21st to end	Night	26% 13% 27% 25% 9% 1	792
April	1st to 10th	Night	29% 13% 28% 25% 5%	720
	11th to 20th	Night	30% 14% 27% 23% 6% 1	711
	21st to end	Night	26% 14% 29% 21% 10%	576
May	1st to 10th	Night	26% 10% 27% 27% 9% 1	428
	11th to 20th	Night	20% 9% 33% 28% 8% 1	354
	21st to end	Night	18% 8% 30% 32% 12%	389
June	1st to 10th	Night	24% 8% 27% 32% 9% 1	360
	11th to 20th	Night	21% 4 29% 32% 13% 1	360
	21st to end	Night	18% 5% 27% 34% 15% 1	360
July	1st to 10th	Night	13% 3 31% 33% 19%	350
	11th to 20th	Night	9% 4 28% 40% 18% 1	348
	21st to end	Night	12% 3 26% 43% 15% 1	394
August	1st to 10th	Night	15% 3 17% 44% 22% 1	358
	11th to 20th	Night	15% 5% 22% 36% 21% 2	546
	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 2024-01-19 09:28:32. Version ac07

Copyright 2024 Attilla Danko