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 2026-09-29.

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 5% 7% 32%	149801
	Night	17% 11% 4 9% 5% 4 4 3 5% 6% 32%	141616
Transparency	Day	50% 6% 13% 19% 10% 1	153248
	Night	52% 6% 12% 19% 10% 1	146258
Seeing	Day	22% 13% 32% 22% 9% 2	16922
	Night	22% 9% 30% 29% 9% 1	25732

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	13% 16% 6% 11% 6% 5% 4 3 5% 5% 27%	4661
	11th to 20th	Day	11% 16% 7% 15% 7% 6% 4 3 4 4 22%	4650
	21st to end	Day	7% 11% 7% 12% 6% 5% 5% 4 6% 6% 30%	5124
February	1st to 10th	Day	11% 17% 5% 12% 7% 5% 4 3 4 5% 28%	1769
	11th to 20th	Day	13% 15% 5% 12% 5% 5% 3 3 4 5% 29%	1967
	21st to end	Day	15% 15% 5% 10% 6% 5% 4 3 4 5% 28%	1730
March	1st to 10th	Day	21% 14% 5% 10% 6% 4 4 3 3 4 25%	4576
	11th to 20th	Day	11% 14% 4 10% 5% 5% 4 4 5% 6% 32%	4768
	21st to end	Day	17% 14% 4 9% 5% 4 4 3 3 5% 33%	6102
April	1st to 10th	Day	21% 12% 4 7% 5% 4 4 3 4 5% 31%	2520
	11th to 20th	Day	22% 8% 3 6% 4 4 4 3 5% 5% 35%	2513
	21st to end	Day	22% 10% 3 7% 4 4 5% 3 5% 6% 30%	2730
May	1st to 10th	Day	25% 10% 3 8% 6% 5% 5% 4 5% 6% 25%	8093
	11th to 20th	Day	20% 8% 3 7% 4 4 4 4 5% 8% 32%	8221
	21st to end	Day	21% 8% 3 8% 5% 5% 5% 4 5% 7% 30%	9060
June	1st to 10th	Day	20% 8% 3 8% 6% 5% 6% 4 6% 6% 29%	2940
	11th to 20th	Day	16% 7% 3 6% 6% 5% 5% 5% 6% 8% 33%	2940
	21st to end	Day	22% 8% 3 8% 6% 5% 5% 4 6% 7% 27%	2940
July	1st to 10th	Day	14% 6% 2 7% 5% 5% 5% 4 7% 9% 36%	8280
	11th to 20th	Day	12% 5% 2 6% 5% 5% 6% 5% 8% 9% 37%	8280
	21st to end	Day	12% 5% 2 6% 5% 5% 6% 5% 7% 9% 38%	8993
August	1st to 10th	Day	14% 7% 3 8% 5% 6% 6% 5% 7% 9% 31%	6483
	11th to 20th	Day	16% 7% 2 7% 4 5% 5% 5% 7% 10% 32%	6049
	21st to end	Day	15% 6% 2 7% 4 5% 4 5% 7% 9% 37%	6080
September	1st to 10th	Day	14% 5% 2 6% 4 4 4 3 7% 8% 42%	2520
	11th to 20th	Day	14% 5% 2 6% 4 4 4 4 5% 7% 47%	2402
	21st to end	Day	20% 7% 2 6% 4 3 3 3 4 6% 41%	2288
October	1st to 10th	Day	20% 8% 3 6% 4 4 4 3 4 7% 37%	2102
	11th to 20th	Day	21% 8% 2 8% 6% 5% 5% 3 5% 7% 28%	1906
	21st to end	Day	24% 12% 3 7% 4 4 4 3 4 5% 30%	1980
November	1st to 10th	Day	16% 11% 3 8% 6% 5% 4 3 4 5% 33%	1851
	11th to 20th	Day	20% 13% 3 7% 5% 5% 4 4 5% 6% 29%	1809
	21st to end	Day	20% 17% 4 8% 5% 5% 3 4 4 6% 24%	1680
December	1st to 10th	Day	19% 17% 5% 11% 7% 5% 4 3 4 4 22%	2680
	11th to 20th	Day	18% 14% 4 10% 5% 4 4 3 4 5% 29%	3066
	21st to end	Day	19% 14% 5% 11% 6% 4 4 4 4 4 26%	4048
January	1st to 10th	Night	13% 18% 6% 13% 6% 5% 4 3 4 5% 23%	8234
	11th to 20th	Night	11% 19% 7% 15% 7% 5% 4 3 4 4 21%	8235
	21st to end	Night	8% 11% 4 14% 8% 6% 5% 4 6% 6% 27%	9057
February	1st to 10th	Night	12% 14% 5% 10% 7% 5% 4 3 5% 5% 30%	2850
	11th to 20th	Night	12% 14% 4 12% 6% 5% 4 3 4 5% 30%	2537
	21st to end	Night	15% 12% 4 9% 6% 6% 4 3 5% 5% 31%	2076
March	1st to 10th	Night	23% 13% 4 12% 6% 4 4 3 4 4 24%	5484
	11th to 20th	Night	14% 14% 4 9% 5% 4 5% 4 5% 7% 29%	5395
	21st to end	Night	15% 11% 4 9% 6% 5% 5% 4 5% 5% 31%	5072
April	1st to 10th	Night	23% 10% 4 7% 4 4 4 4 4 6% 31%	2100
	11th to 20th	Night	20% 8% 3 7% 5% 4 3 4 5% 5% 36%	2055
	21st to end	Night	22% 10% 2 7% 4 3 3 3 4 7% 35%	1890
May	1st to 10th	Night	23% 8% 3 7% 4 5% 5% 4 6% 7% 27%	4849
	11th to 20th	Night	22% 6% 2 7% 4 4 4 3 5% 8% 34%	4639
	21st to end	Night	20% 8% 4 7% 5% 5% 4 3 5% 7% 32%	5114
June	1st to 10th	Night	20% 7% 1 5% 5% 4 4 4 7% 7% 36%	1680
	11th to 20th	Night	19% 6% 2 6% 5% 4 5% 4 5% 7% 37%	1680
	21st to end	Night	19% 7% 2 7% 5% 4 5% 3 5% 7% 34%	1680
July	1st to 10th	Night	13% 6% 2 6% 5% 5% 6% 5% 7% 9% 38%	4680
	11th to 20th	Night	12% 5% 2 6% 4 4 5% 4 7% 8% 43%	4680
	21st to end	Night	13% 5% 2 5% 4 5% 5% 4 6% 8% 41%	5084
August	1st to 10th	Night	14% 8% 3 8% 5% 4 5% 4 6% 7% 36%	3666
	11th to 20th	Night	16% 6% 2 6% 4 4 5% 4 6% 8% 40%	3946
	21st to end	Night	17% 8% 3 7% 4 4 4 3 5% 6% 40%	5045
September	1st to 10th	Night	12% 6% 2 6% 3 4 4 4 6% 7% 46%	2100
	11th to 20th	Night	14% 5% 1 5% 3 3 4 3 5% 6% 51%	2217
	21st to end	Night	17% 6% 2 5% 4 4 4 3 5% 6% 45%	2289
October	1st to 10th	Night	18% 7% 2 7% 4 4 4 3 4 5% 42%	2295
	11th to 20th	Night	21% 8% 3 6% 4 3 4 3 4 6% 37%	2493
	21st to end	Night	24% 8% 3 8% 5% 4 4 2 4 6% 32%	2860
November	1st to 10th	Night	18% 10% 4 8% 5% 4 4 3 5% 6% 33%	2667
	11th to 20th	Night	19% 10% 4 8% 5% 4 4 4 5% 6% 32%	2809
	21st to end	Night	21% 15% 4 8% 6% 4 4 3 4 5% 26%	2940
December	1st to 10th	Night	16% 14% 5% 10% 6% 6% 5% 4 6% 6% 23%	4720
	11th to 20th	Night	24% 12% 4 9% 5% 4 4 3 3 4 27%	5348
	21st to end	Night	21% 17% 6% 9% 4 3 3 2 3 4 28%	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	58% 5% 12% 17% 7%	4662
	11th to 20th	Day	65% 5% 8% 13% 8% 1	4680
	21st to end	Day	53% 5% 9% 18% 14% 1	5124
February	1st to 10th	Day	59% 4 8% 18% 9% 2	1769
	11th to 20th	Day	57% 4 12% 14% 12% 1	1976
	21st to end	Day	58% 5% 8% 17% 10% 2	1730
March	1st to 10th	Day	61% 5% 8% 11% 11% 3	4579
	11th to 20th	Day	51% 7% 16% 12% 12% 2	4768
	21st to end	Day	54% 4 7% 16% 16% 3	6102
April	1st to 10th	Day	55% 5% 11% 15% 12% 2	2520
	11th to 20th	Day	49% 5% 10% 21% 12% 3	2513
	21st to end	Day	53% 6% 10% 17% 13% 3	2730
May	1st to 10th	Day	57% 6% 9% 17% 10% 1	8105
	11th to 20th	Day	48% 7% 16% 20% 7% 2	8225
	21st to end	Day	52% 7% 10% 17% 12% 2	9061
June	1st to 10th	Day	52% 8% 11% 18% 10% 2	2940
	11th to 20th	Day	46% 7% 14% 21% 11% 2	2940
	21st to end	Day	55% 8% 11% 16% 9% 1	2940
July	1st to 10th	Day	43% 7% 14% 24% 12%	8210
	11th to 20th	Day	39% 8% 16% 26% 10%	8205
	21st to end	Day	41% 8% 17% 27% 8%	8795
August	1st to 10th	Day	46% 9% 16% 19% 9% 1	6469
	11th to 20th	Day	43% 9% 20% 21% 6%	6091
	21st to end	Day	41% 7% 18% 22% 11% 1	6080
September	1st to 10th	Day	38% 6% 19% 25% 11% 1	2520
	11th to 20th	Day	36% 5% 16% 30% 11% 1	2402
	21st to end	Day	43% 7% 12% 25% 13%	2288
October	1st to 10th	Day	45% 7% 13% 27% 7%	3427
	11th to 20th	Day	47% 6% 17% 24% 5%	3083
	21st to end	Day	46% 6% 21% 19% 8% 1	3180
November	1st to 10th	Day	52% 6% 14% 19% 9% 1	1851
	11th to 20th	Day	54% 6% 12% 17% 10%	1809
	21st to end	Day	61% 6% 11% 15% 6%	1680
December	1st to 10th	Day	65% 4 9% 17% 5%	2680
	11th to 20th	Day	57% 5% 8% 17% 12%	3066
	21st to end	Day	60% 6% 8% 15% 10%	4048
January	1st to 10th	Night	64% 5% 10% 15% 6% 1	8234
	11th to 20th	Night	66% 5% 9% 14% 5% 1	8280
	21st to end	Night	56% 5% 9% 15% 14%	9057
February	1st to 10th	Night	55% 5% 10% 18% 10% 1	2850
	11th to 20th	Night	56% 5% 10% 17% 11% 1	2539
	21st to end	Night	54% 4 9% 18% 13% 2	2076
March	1st to 10th	Night	63% 4 8% 11% 10% 3	5494
	11th to 20th	Night	53% 6% 13% 14% 11% 2	5396
	21st to end	Night	53% 5% 7% 22% 10% 2	5072
April	1st to 10th	Night	54% 4 10% 16% 14% 2	2100
	11th to 20th	Night	48% 6% 9% 21% 14% 2	2055
	21st to end	Night	49% 4 9% 19% 16% 3	1890
May	1st to 10th	Night	54% 6% 11% 18% 9% 1	4855
	11th to 20th	Night	47% 7% 13% 21% 10% 1	4640
	21st to end	Night	51% 6% 10% 17% 15% 1	5115
June	1st to 10th	Night	45% 7% 13% 20% 14% 1	1680
	11th to 20th	Night	46% 7% 12% 19% 13% 4	1680
	21st to end	Night	49% 7% 12% 18% 13% 1	1680
July	1st to 10th	Night	41% 7% 19% 22% 12%	4640
	11th to 20th	Night	37% 7% 18% 29% 10%	4632
	21st to end	Night	40% 6% 16% 28% 9%	4967
August	1st to 10th	Night	47% 7% 16% 21% 9% 1	3656
	11th to 20th	Night	42% 6% 20% 25% 7%	3970
	21st to end	Night	45% 6% 15% 23% 11%	5045
September	1st to 10th	Night	36% 7% 17% 26% 13% 1	2100
	11th to 20th	Night	33% 6% 17% 33% 11% 1	2217
	21st to end	Night	40% 6% 11% 28% 15%	2289
October	1st to 10th	Night	48% 5% 13% 24% 9%	3750
	11th to 20th	Night	42% 5% 14% 30% 8%	4055
	21st to end	Night	45% 5% 17% 20% 11% 2	4610
November	1st to 10th	Night	52% 5% 13% 21% 8% 1	2667
	11th to 20th	Night	52% 6% 12% 19% 10% 1	2809
	21st to end	Night	61% 5% 11% 16% 8%	2940
December	1st to 10th	Night	61% 6% 13% 15% 5%	4720
	11th to 20th	Night	61% 5% 8% 17% 10%	5348
	21st to end	Night	62% 4 6% 16% 11% 1	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	27% 14% 33% 21% 5%	220
	11th to 20th	Day	24% 16% 34% 20% 5% 1	220
	21st to end	Day	17% 11% 41% 21% 8% 2	242
February	1st to 10th	Day	24% 19% 39% 16% 3	267
	11th to 20th	Day	23% 16% 38% 20% 3	455
	21st to end	Day	24% 16% 36% 19% 4	446
March	1st to 10th	Day	25% 15% 34% 21% 5%	540
	11th to 20th	Day	24% 16% 36% 18% 5% 1	540
	21st to end	Day	28% 18% 30% 16% 7% 2	594
April	1st to 10th	Day	29% 16% 29% 20% 6% 1	540
	11th to 20th	Day	28% 16% 30% 19% 5% 2	532
	21st to end	Day	28% 18% 35% 13% 5% 1	540
May	1st to 10th	Day	28% 13% 35% 17% 5% 1	543
	11th to 20th	Day	22% 12% 32% 24% 7% 2	567
	21st to end	Day	23% 16% 35% 18% 7% 1	617
June	1st to 10th	Day	22% 12% 33% 23% 9% 2	570
	11th to 20th	Day	19% 12% 35% 21% 11% 2	570
	21st to end	Day	23% 10% 29% 26% 10% 2	570
July	1st to 10th	Day	17% 8% 32% 28% 13% 2	565
	11th to 20th	Day	15% 11% 32% 28% 12% 2	564
	21st to end	Day	13% 8% 30% 30% 15% 3	620
August	1st to 10th	Day	14% 7% 30% 29% 17% 3	566
	11th to 20th	Day	15% 5% 27% 31% 16% 6%	559
	21st to end	Day	17% 11% 27% 22% 17% 7%	627
September	1st to 10th	Day	17% 9% 33% 22% 13% 5%	570
	11th to 20th	Day	14% 10% 26% 25% 16% 8%	570
	21st to end	Day	22% 8% 29% 25% 11% 6%	562
October	1st to 10th	Day	24% 12% 27% 23% 12% 2	530
	11th to 20th	Day	23% 11% 33% 22% 9% 1	478
	21st to end	Day	30% 13% 31% 19% 7%	462
November	1st to 10th	Day	28% 14% 28% 24% 6% 1	425
	11th to 20th	Day	28% 12% 32% 21% 6% 1	349
	21st to end	Day	30% 17% 33% 15% 4 1	220
December	1st to 10th	Day	30% 13% 29% 21% 7% 1	220
	11th to 20th	Day	27% 15% 36% 18% 1 1	220
	21st to end	Day	29% 18% 31% 15% 5% 2	242
January	1st to 10th	Night	26% 9% 34% 26% 5%	840
	11th to 20th	Night	28% 10% 34% 22% 7%	840
	21st to end	Night	17% 7% 34% 35% 7% 1	924
February	1st to 10th	Night	18% 9% 39% 28% 7%	840
	11th to 20th	Night	20% 12% 38% 25% 5%	823
	21st to end	Night	21% 10% 33% 31% 6%	692
March	1st to 10th	Night	24% 12% 31% 28% 4	840
	11th to 20th	Night	23% 11% 35% 25% 5% 1	840
	21st to end	Night	22% 12% 33% 25% 7%	924
April	1st to 10th	Night	28% 12% 29% 25% 6%	840
	11th to 20th	Night	25% 13% 32% 25% 5%	811
	21st to end	Night	27% 13% 32% 22% 6%	630
May	1st to 10th	Night	26% 9% 31% 28% 5% 1	492
	11th to 20th	Night	24% 9% 29% 31% 7%	414
	21st to end	Night	22% 6% 38% 26% 9%	455
June	1st to 10th	Night	21% 5% 28% 36% 9%	420
	11th to 20th	Night	20% 6% 26% 36% 12% 1	420
	21st to end	Night	21% 5% 25% 37% 12%	420
July	1st to 10th	Night	13% 3 28% 42% 14%	410
	11th to 20th	Night	13% 4 26% 41% 15%	408
	21st to end	Night	17% 5% 20% 41% 15% 1	460
August	1st to 10th	Night	12% 3 18% 47% 19% 1	418
	11th to 20th	Night	15% 4 22% 38% 20% 1	550
	21st to end	Night	18% 4 25% 32% 19% 1	924
September	1st to 10th	Night	15% 5% 26% 38% 14% 1	840
	11th to 20th	Night	16% 6% 25% 33% 19% 1	840
	21st to end	Night	20% 5% 28% 30% 15% 1	833
October	1st to 10th	Night	21% 8% 30% 32% 10%	800
	11th to 20th	Night	24% 8% 29% 29% 9% 1	800
	21st to end	Night	29% 9% 31% 25% 6%	880
November	1st to 10th	Night	24% 10% 30% 28% 7% 1	820
	11th to 20th	Night	23% 10% 32% 24% 10% 1	840
	21st to end	Night	29% 12% 28% 25% 5% 1	840
December	1st to 10th	Night	28% 7% 32% 25% 8%	840
	11th to 20th	Night	27% 10% 35% 21% 6% 1	840
	21st to end	Night	31% 11% 29% 22% 6%	924

Page generated at 2026-09-26 04:18:44. Version ac07

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