St-Élie-de-Caxton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the St-Élie-de-Caxton clear sky chart from 2005-11-06 to 2024-03-08.

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% 10% 4 7% 6% 4 5% 5% 5% 6% 32%	78358
	Night	18% 10% 4 7% 6% 3 4 4 4 6% 33%	81203
Transparency	Day	51% 7% 13% 19% 10% 1	78063
	Night	52% 6% 12% 19% 10% 1	81032
Seeing	Day	22% 12% 31% 23% 10% 2	13588
	Night	23% 8% 31% 29% 9% 1	22669

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	15% 14% 5% 8% 7% 4 4 4 5% 5% 28%	2517
	11th to 20th	Day	13% 13% 6% 11% 9% 4 4 4 4 5% 27%	2520
	21st to end	Day	12% 12% 6% 10% 8% 3 5% 4 6% 6% 26%	2772
February	1st to 10th	Day	13% 16% 6% 10% 7% 5% 4 3 4 5% 27%	1600
	11th to 20th	Day	13% 14% 5% 11% 7% 4 4 4 4 5% 29%	1774
	21st to end	Day	17% 13% 6% 8% 7% 4 4 3 4 5% 28%	1570
March	1st to 10th	Day	15% 12% 4 10% 7% 3 5% 4 4 6% 31%	1867
	11th to 20th	Day	16% 13% 4 7% 6% 4 4 5% 4 5% 32%	1848
	21st to end	Day	17% 11% 4 7% 7% 3 5% 4 4 5% 32%	2376
April	1st to 10th	Day	22% 11% 5% 7% 6% 3 4 4 3 5% 30%	2160
	11th to 20th	Day	21% 7% 3 5% 5% 3 4 4 5% 5% 37%	2150
	21st to end	Day	23% 10% 4 6% 5% 3 5% 4 4 6% 30%	2340
May	1st to 10th	Day	23% 8% 3 5% 5% 3 4 4 4 6% 34%	2474
	11th to 20th	Day	19% 7% 3 6% 5% 3 4 5% 5% 7% 34%	2478
	21st to end	Day	20% 7% 3 6% 6% 3 4 5% 5% 8% 33%	2725
June	1st to 10th	Day	21% 7% 3 7% 7% 3 6% 5% 6% 7% 28%	2520
	11th to 20th	Day	17% 7% 3 6% 6% 4 5% 5% 6% 8% 34%	2520
	21st to end	Day	23% 7% 3 7% 8% 4 6% 4 6% 6% 27%	2520
July	1st to 10th	Day	14% 5% 2 6% 6% 4 6% 6% 7% 9% 35%	2520
	11th to 20th	Day	13% 6% 3 6% 6% 4 6% 6% 8% 9% 33%	2520
	21st to end	Day	14% 6% 3 6% 6% 5% 7% 7% 8% 8% 31%	2744
August	1st to 10th	Day	15% 7% 3 6% 6% 4 6% 7% 7% 10% 29%	2506
	11th to 20th	Day	14% 6% 2 5% 6% 4 6% 6% 7% 8% 36%	2345
	21st to end	Day	13% 7% 2 5% 6% 3 5% 6% 6% 9% 39%	2376
September	1st to 10th	Day	15% 5% 2 5% 5% 3 4 4 7% 8% 42%	2160
	11th to 20th	Day	16% 5% 2 5% 4 3 3 5% 4 7% 45%	2060
	21st to end	Day	21% 7% 2 5% 4 3 4 4 4 6% 41%	1980
October	1st to 10th	Day	22% 8% 3 5% 5% 4 4 4 5% 6% 36%	1892
	11th to 20th	Day	23% 8% 3 7% 8% 3 6% 3 5% 7% 27%	1716
	21st to end	Day	26% 12% 4 6% 5% 3 4 3 4 5% 29%	1782
November	1st to 10th	Day	16% 10% 3 7% 6% 4 5% 4 5% 5% 34%	1671
	11th to 20th	Day	21% 11% 4 7% 5% 3 4 4 5% 6% 28%	1637
	21st to end	Day	20% 15% 4 7% 6% 3 4 5% 4 6% 27%	1520
December	1st to 10th	Day	25% 15% 3 7% 7% 4 5% 4 3 4 23%	1520
	11th to 20th	Day	22% 14% 4 9% 5% 2 4 4 4 4 28%	1906
	21st to end	Day	22% 17% 6% 10% 5% 2 3 4 4 5% 23%	2772
January	1st to 10th	Night	16% 15% 6% 9% 6% 3 5% 4 4 5% 26%	4429
	11th to 20th	Night	12% 13% 6% 10% 8% 4 5% 5% 4 5% 29%	4440
	21st to end	Night	12% 13% 5% 11% 9% 4 6% 5% 5% 5% 25%	4884
February	1st to 10th	Night	13% 13% 6% 9% 8% 4 5% 5% 5% 5% 29%	2580
	11th to 20th	Night	12% 12% 5% 11% 7% 4 4 4 4 6% 30%	2290
	21st to end	Night	16% 11% 4 8% 7% 4 5% 4 5% 5% 32%	1884
March	1st to 10th	Night	16% 11% 4 9% 8% 4 4 4 5% 6% 30%	2241
	11th to 20th	Night	17% 13% 5% 7% 6% 4 5% 5% 4 5% 31%	2109
	21st to end	Night	16% 10% 4 7% 6% 3 5% 5% 3 5% 37%	1980
April	1st to 10th	Night	24% 9% 4 7% 5% 3 4 5% 4 5% 30%	1800
	11th to 20th	Night	19% 6% 3 6% 5% 2 4 4 5% 6% 38%	1758
	21st to end	Night	23% 10% 3 6% 5% 2 4 4 4 6% 34%	1620
May	1st to 10th	Night	23% 8% 3 6% 5% 3 4 4 4 6% 35%	1503
	11th to 20th	Night	21% 6% 2 6% 5% 2 5% 3 6% 7% 37%	1415
	21st to end	Night	19% 5% 4 5% 6% 3 5% 4 4 6% 40%	1550
June	1st to 10th	Night	20% 7% 2 5% 5% 3 3 5% 7% 7% 35%	1440
	11th to 20th	Night	20% 6% 3 5% 6% 3 5% 5% 5% 7% 37%	1440
	21st to end	Night	19% 7% 2 6% 6% 2 6% 5% 5% 7% 34%	1440
July	1st to 10th	Night	12% 5% 2 5% 6% 3 6% 5% 6% 9% 40%	1440
	11th to 20th	Night	13% 5% 3 6% 6% 3 6% 5% 5% 7% 41%	1440
	21st to end	Night	14% 5% 2 4 5% 4 6% 6% 6% 8% 40%	1574
August	1st to 10th	Night	11% 6% 3 5% 6% 3 5% 5% 6% 9% 42%	1432
	11th to 20th	Night	14% 6% 2 5% 6% 3 5% 5% 5% 7% 42%	1533
	21st to end	Night	15% 6% 2 4 5% 2 4 4 4 7% 45%	1980
September	1st to 10th	Night	12% 6% 2 5% 4 3 4 5% 6% 7% 45%	1800
	11th to 20th	Night	16% 5% 2 4 4 2 4 3 5% 6% 49%	1899
	21st to end	Night	18% 5% 2 4 4 3 4 4 4 6% 45%	1980
October	1st to 10th	Night	18% 7% 3 7% 5% 3 4 4 4 5% 41%	2065
	11th to 20th	Night	23% 8% 3 5% 6% 3 4 3 4 6% 35%	2243
	21st to end	Night	25% 8% 3 7% 5% 3 4 3 4 6% 31%	2574
November	1st to 10th	Night	18% 9% 4 6% 6% 3 5% 4 4 6% 34%	2407
	11th to 20th	Night	20% 9% 4 7% 6% 4 4 5% 4 6% 31%	2541
	21st to end	Night	22% 13% 4 7% 6% 3 4 4 4 5% 28%	2660
December	1st to 10th	Night	21% 13% 5% 9% 7% 3 5% 4 5% 5% 23%	2660
	11th to 20th	Night	23% 13% 5% 8% 5% 3 4 4 3 5% 27%	3288
	21st to end	Night	23% 18% 6% 8% 5% 2 3 3 3 4 25%	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	57% 6% 15% 17% 5% 1	2518
	11th to 20th	Day	57% 6% 11% 18% 6%	2520
	21st to end	Day	56% 7% 12% 18% 7% 1	2772
February	1st to 10th	Day	60% 4 9% 17% 8% 2	1600
	11th to 20th	Day	58% 4 13% 13% 11% 1	1783
	21st to end	Day	59% 5% 9% 16% 9% 3	1570
March	1st to 10th	Day	54% 5% 11% 16% 12% 2	1870
	11th to 20th	Day	53% 6% 11% 14% 13% 3	1848
	21st to end	Day	53% 5% 10% 17% 12% 3	2376
April	1st to 10th	Day	55% 5% 11% 14% 11% 3	2160
	11th to 20th	Day	47% 6% 11% 21% 12% 3	2150
	21st to end	Day	54% 6% 9% 16% 13% 3	2340
May	1st to 10th	Day	49% 5% 9% 20% 14% 2	2474
	11th to 20th	Day	47% 6% 11% 18% 15% 3	2482
	21st to end	Day	50% 6% 11% 17% 14% 2	2725
June	1st to 10th	Day	52% 9% 11% 17% 9% 2	2520
	11th to 20th	Day	46% 7% 13% 20% 11% 2	2520
	21st to end	Day	56% 8% 11% 15% 9%	2520
July	1st to 10th	Day	42% 9% 17% 23% 10%	2450
	11th to 20th	Day	43% 9% 18% 22% 9%	2445
	21st to end	Day	46% 11% 16% 20% 7%	2591
August	1st to 10th	Day	46% 11% 18% 20% 5%	2492
	11th to 20th	Day	40% 11% 18% 22% 9%	2345
	21st to end	Day	39% 8% 16% 25% 11%	2376
September	1st to 10th	Day	39% 6% 18% 24% 11% 1	2160
	11th to 20th	Day	38% 6% 16% 28% 11% 1	2060
	21st to end	Day	43% 7% 13% 26% 10%	1980
October	1st to 10th	Day	49% 5% 12% 24% 9% 1	1892
	11th to 20th	Day	57% 7% 14% 18% 4	1716
	21st to end	Day	58% 5% 12% 15% 8% 1	1782
November	1st to 10th	Day	51% 6% 15% 18% 9% 1	1671
	11th to 20th	Day	55% 6% 13% 16% 10%	1637
	21st to end	Day	59% 7% 13% 16% 6% 1	1520
December	1st to 10th	Day	64% 5% 10% 16% 5%	1520
	11th to 20th	Day	60% 5% 9% 19% 8%	1906
	21st to end	Day	65% 6% 9% 13% 7% 1	2772
January	1st to 10th	Night	59% 7% 15% 13% 6%	4429
	11th to 20th	Night	57% 7% 12% 19% 5% 1	4440
	21st to end	Night	59% 7% 12% 14% 8% 1	4884
February	1st to 10th	Night	57% 5% 10% 18% 9% 1	2580
	11th to 20th	Night	56% 6% 11% 16% 11% 1	2292
	21st to end	Night	54% 4 9% 18% 13% 2	1884
March	1st to 10th	Night	56% 6% 9% 17% 11% 2	2251
	11th to 20th	Night	55% 5% 8% 15% 13% 3	2110
	21st to end	Night	49% 5% 9% 20% 13% 4	1980
April	1st to 10th	Night	55% 4 11% 15% 13% 2	1800
	11th to 20th	Night	45% 6% 9% 22% 15% 2	1758
	21st to end	Night	51% 5% 9% 18% 15% 3	1620
May	1st to 10th	Night	51% 5% 9% 17% 15% 4	1503
	11th to 20th	Night	46% 6% 11% 18% 15% 4	1416
	21st to end	Night	46% 6% 11% 19% 16% 2	1551
June	1st to 10th	Night	46% 8% 14% 20% 12% 1	1440
	11th to 20th	Night	45% 7% 11% 19% 12% 4	1440
	21st to end	Night	48% 8% 13% 18% 13%	1440
July	1st to 10th	Night	39% 9% 17% 22% 12% 1	1400
	11th to 20th	Night	40% 9% 14% 26% 10% 1	1392
	21st to end	Night	40% 9% 17% 24% 10%	1486
August	1st to 10th	Night	38% 10% 18% 27% 8%	1422
	11th to 20th	Night	40% 7% 18% 24% 11%	1533
	21st to end	Night	39% 7% 15% 28% 11%	1980
September	1st to 10th	Night	37% 7% 17% 25% 14% 1	1800
	11th to 20th	Night	34% 6% 17% 31% 10% 1	1899
	21st to end	Night	40% 6% 12% 29% 13%	1980
October	1st to 10th	Night	47% 5% 9% 25% 13% 1	2065
	11th to 20th	Night	50% 6% 15% 22% 7%	2243
	21st to end	Night	54% 6% 12% 18% 9%	2574
November	1st to 10th	Night	51% 6% 13% 20% 9% 1	2407
	11th to 20th	Night	53% 6% 13% 17% 10% 1	2541
	21st to end	Night	59% 5% 11% 16% 8%	2660
December	1st to 10th	Night	63% 5% 11% 15% 5%	2660
	11th to 20th	Night	61% 5% 9% 17% 8% 1	3288
	21st to end	Night	65% 5% 8% 16% 6% 1	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	27% 14% 32% 23% 5%	180
	11th to 20th	Day	24% 15% 34% 21% 5% 1	180
	21st to end	Day	19% 8% 42% 21% 9% 2	198
February	1st to 10th	Day	27% 19% 39% 15% 1	218
	11th to 20th	Day	23% 14% 39% 21% 3	382
	21st to end	Day	25% 16% 33% 21% 4	382
March	1st to 10th	Day	23% 14% 35% 23% 6%	448
	11th to 20th	Day	22% 16% 35% 19% 6% 1	420
	21st to end	Day	28% 14% 29% 19% 8% 2	462
April	1st to 10th	Day	28% 13% 29% 23% 7%	420
	11th to 20th	Day	25% 15% 30% 21% 7% 2	412
	21st to end	Day	28% 15% 35% 14% 5% 2	420
May	1st to 10th	Day	27% 13% 34% 18% 6% 1	423
	11th to 20th	Day	21% 11% 34% 23% 8% 2	447
	21st to end	Day	21% 14% 37% 18% 9% 1	485
June	1st to 10th	Day	22% 12% 34% 21% 8% 2	450
	11th to 20th	Day	19% 11% 32% 24% 12% 2	450
	21st to end	Day	24% 9% 27% 27% 12% 2	450
July	1st to 10th	Day	16% 7% 30% 29% 16% 3	445
	11th to 20th	Day	15% 9% 29% 30% 15% 2	444
	21st to end	Day	13% 7% 29% 31% 17% 3	488
August	1st to 10th	Day	15% 6% 28% 29% 19% 3	446
	11th to 20th	Day	15% 5% 25% 33% 16% 6%	439
	21st to end	Day	16% 10% 29% 21% 16% 8%	495
September	1st to 10th	Day	16% 8% 33% 22% 15% 6%	450
	11th to 20th	Day	16% 10% 26% 24% 15% 8%	450
	21st to end	Day	22% 7% 30% 24% 11% 6%	450
October	1st to 10th	Day	26% 11% 26% 22% 12% 2	450
	11th to 20th	Day	25% 10% 34% 20% 10% 1	408
	21st to end	Day	31% 12% 30% 19% 7%	396
November	1st to 10th	Day	25% 13% 29% 25% 7% 1	365
	11th to 20th	Day	28% 12% 32% 21% 7%	297
	21st to end	Day	28% 17% 33% 16% 4 1	180
December	1st to 10th	Day	31% 13% 27% 21% 7% 2	180
	11th to 20th	Day	27% 16% 34% 19% 2 2	180
	21st to end	Day	30% 20% 27% 17% 6% 1	198
January	1st to 10th	Night	27% 8% 34% 26% 5%	760
	11th to 20th	Night	27% 9% 35% 23% 6%	760
	21st to end	Night	18% 6% 34% 36% 6% 1	836
February	1st to 10th	Night	19% 9% 39% 28% 6% 1	760
	11th to 20th	Night	20% 11% 38% 26% 5% 1	743
	21st to end	Night	21% 10% 33% 29% 6%	628
March	1st to 10th	Night	23% 11% 31% 31% 4	751
	11th to 20th	Night	23% 10% 35% 25% 6% 1	720
	21st to end	Night	22% 11% 32% 27% 8%	792
April	1st to 10th	Night	28% 10% 28% 27% 6%	720
	11th to 20th	Night	23% 12% 32% 26% 6% 1	694
	21st to end	Night	27% 11% 32% 23% 6%	540
May	1st to 10th	Night	25% 9% 31% 28% 6% 1	423
	11th to 20th	Night	24% 9% 29% 31% 7%	354
	21st to end	Night	22% 5% 37% 26% 9%	389
June	1st to 10th	Night	22% 6% 29% 33% 9%	360
	11th to 20th	Night	21% 5% 25% 36% 13% 1	360
	21st to end	Night	19% 4 25% 38% 13%	360
July	1st to 10th	Night	14% 3 29% 39% 15%	350
	11th to 20th	Night	13% 3 26% 41% 17% 1	348
	21st to end	Night	17% 4 21% 42% 16% 1	394
August	1st to 10th	Night	13% 3 18% 47% 19% 1	358
	11th to 20th	Night	15% 4 22% 38% 20% 1	469
	21st to end	Night	17% 4 27% 31% 20% 1	792
September	1st to 10th	Night	15% 4 26% 39% 15% 1	720
	11th to 20th	Night	18% 6% 24% 32% 18% 1	720
	21st to end	Night	21% 5% 30% 28% 15% 2	720
October	1st to 10th	Night	21% 8% 30% 31% 10%	720
	11th to 20th	Night	25% 7% 28% 28% 10% 1	720
	21st to end	Night	30% 8% 31% 25% 6%	792
November	1st to 10th	Night	23% 10% 30% 28% 7% 1	740
	11th to 20th	Night	23% 10% 33% 24% 10% 1	760
	21st to end	Night	29% 11% 28% 26% 5% 1	760
December	1st to 10th	Night	30% 6% 32% 25% 8%	760
	11th to 20th	Night	27% 9% 35% 22% 6% 1	760
	21st to end	Night	31% 10% 29% 23% 6%	836

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