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 2024-11-02.

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%	101563
	Night	18% 10% 4 8% 5% 4 4 3 5% 6% 33%	97425
Transparency	Day	50% 7% 13% 19% 10% 1	101324
	Night	52% 6% 13% 19% 10% 1	97284
Seeing	Day	22% 12% 32% 23% 10% 2	14527
	Night	23% 8% 30% 29% 9% 1	23398

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% 15% 5% 9% 6% 5% 4 3 5% 5% 28%	2517
	11th to 20th	Day	13% 14% 6% 13% 7% 4 4 3 4 5% 27%	2520
	21st to end	Day	12% 12% 6% 12% 7% 5% 4 3 6% 7% 26%	2772
February	1st to 10th	Day	12% 18% 5% 11% 6% 5% 4 3 4 5% 27%	1600
	11th to 20th	Day	13% 14% 5% 13% 6% 5% 4 3 4 5% 28%	1774
	21st to end	Day	17% 15% 5% 9% 6% 4 4 3 4 5% 28%	1570
March	1st to 10th	Day	20% 12% 4 10% 6% 4 4 3 4 5% 28%	3116
	11th to 20th	Day	12% 18% 5% 11% 6% 5% 4 4 4 5% 27%	3264
	21st to end	Day	13% 13% 4 8% 6% 4 4 3 4 5% 37%	4166
April	1st to 10th	Day	21% 13% 4 8% 5% 4 4 3 4 5% 30%	2280
	11th to 20th	Day	22% 8% 3 6% 4 4 4 3 5% 5% 36%	2271
	21st to end	Day	22% 10% 4 7% 4 4 5% 3 5% 6% 30%	2470
May	1st to 10th	Day	21% 8% 3 6% 5% 4 4 3 5% 7% 33%	4352
	11th to 20th	Day	17% 7% 3 7% 5% 4 5% 4 6% 9% 34%	4398
	21st to end	Day	17% 7% 2 8% 5% 5% 6% 4 6% 8% 33%	4837
June	1st to 10th	Day	20% 8% 3 8% 6% 5% 6% 4 6% 7% 28%	2660
	11th to 20th	Day	16% 7% 3 6% 6% 5% 5% 5% 6% 8% 33%	2660
	21st to end	Day	23% 8% 3 8% 7% 5% 5% 4 6% 6% 26%	2660
July	1st to 10th	Day	13% 7% 3 8% 6% 6% 6% 5% 7% 9% 32%	4440
	11th to 20th	Day	14% 6% 2 7% 6% 5% 6% 5% 8% 9% 32%	4440
	21st to end	Day	13% 5% 2 6% 5% 5% 5% 5% 6% 7% 41%	4814
August	1st to 10th	Day	14% 6% 3 8% 5% 6% 6% 5% 8% 10% 30%	4423
	11th to 20th	Day	18% 7% 2 6% 4 5% 5% 4 7% 9% 32%	4111
	21st to end	Day	16% 6% 2 7% 4 5% 4 4 6% 7% 38%	4180
September	1st to 10th	Day	15% 5% 2 6% 4 4 4 3 7% 8% 42%	2280
	11th to 20th	Day	15% 5% 2 6% 4 3 3 4 5% 7% 46%	2174
	21st to end	Day	21% 8% 2 6% 4 3 3 3 4 6% 40%	2090
October	1st to 10th	Day	21% 9% 3 6% 4 5% 4 3 5% 6% 35%	1997
	11th to 20th	Day	22% 9% 2 8% 7% 5% 5% 3 5% 7% 27%	1811
	21st to end	Day	24% 13% 3 7% 4 4 4 3 4 5% 30%	1881
November	1st to 10th	Day	16% 11% 3 8% 6% 5% 4 3 5% 5% 34%	1680
	11th to 20th	Day	21% 12% 3 8% 5% 5% 4 3 5% 6% 28%	1637
	21st to end	Day	19% 16% 3 7% 5% 5% 3 4 4 6% 26%	1520
December	1st to 10th	Day	25% 16% 3 8% 6% 5% 4 3 3 4 23%	1520
	11th to 20th	Day	22% 15% 4 9% 5% 3 3 3 4 4 28%	1906
	21st to end	Day	22% 17% 6% 10% 4 3 3 3 4 4 23%	2772
January	1st to 10th	Night	16% 16% 5% 10% 6% 5% 4 3 4 5% 26%	4429
	11th to 20th	Night	11% 14% 6% 11% 7% 5% 5% 4 4 5% 29%	4440
	21st to end	Night	12% 13% 5% 13% 7% 6% 5% 4 5% 5% 25%	4884
February	1st to 10th	Night	13% 14% 5% 10% 7% 6% 4 3 5% 5% 29%	2580
	11th to 20th	Night	12% 13% 4 13% 6% 4 4 3 4 5% 30%	2290
	21st to end	Night	16% 12% 4 9% 6% 5% 4 3 5% 5% 32%	1884
March	1st to 10th	Night	22% 12% 4 8% 5% 4 4 3 4 5% 28%	3724
	11th to 20th	Night	16% 18% 4 10% 5% 4 4 3 4 4 27%	3693
	21st to end	Night	14% 9% 4 9% 6% 5% 5% 4 4 5% 35%	3466
April	1st to 10th	Night	23% 10% 3 7% 4 4 4 4 4 6% 31%	1900
	11th to 20th	Night	20% 7% 3 7% 5% 4 3 4 5% 6% 37%	1857
	21st to end	Night	22% 10% 2 7% 4 3 3 3 4 7% 34%	1710
May	1st to 10th	Night	22% 9% 3 7% 4 5% 5% 4 5% 6% 31%	2619
	11th to 20th	Night	22% 6% 2 6% 4 4 4 3 6% 7% 37%	2495
	21st to end	Night	18% 6% 3 7% 6% 5% 4 4 5% 8% 33%	2738
June	1st to 10th	Night	20% 8% 1 6% 5% 4 4 4 7% 7% 35%	1520
	11th to 20th	Night	19% 6% 2 6% 5% 3 4 4 6% 7% 37%	1520
	21st to end	Night	20% 8% 2 7% 6% 4 5% 4 5% 7% 33%	1520
July	1st to 10th	Night	13% 7% 2 7% 5% 6% 6% 5% 7% 8% 34%	2520
	11th to 20th	Night	16% 5% 3 7% 4 4 5% 4 6% 7% 41%	2520
	21st to end	Night	12% 4 2 4 4 5% 5% 4 6% 7% 47%	2739
August	1st to 10th	Night	13% 7% 2 9% 6% 5% 5% 4 5% 7% 38%	2506
	11th to 20th	Night	18% 7% 2 6% 4 4 4 4 5% 7% 39%	2681
	21st to end	Night	17% 7% 3 7% 4 4 4 3 4 6% 39%	3476
September	1st to 10th	Night	12% 6% 2 6% 3 4 4 4 6% 7% 46%	1900
	11th to 20th	Night	15% 5% 1 4 3 3 4 3 5% 6% 50%	2005
	21st to end	Night	18% 6% 2 5% 4 4 3 3 4 6% 45%	2090
October	1st to 10th	Night	18% 7% 3 8% 4 4 4 3 5% 5% 40%	2180
	11th to 20th	Night	22% 8% 3 6% 4 4 4 3 4 6% 36%	2368
	21st to end	Night	24% 8% 3 8% 5% 3 4 2 4 6% 32%	2717
November	1st to 10th	Night	18% 10% 4 8% 5% 4 4 3 5% 6% 34%	2421
	11th to 20th	Night	19% 10% 3 8% 5% 4 4 4 5% 6% 31%	2541
	21st to end	Night	21% 14% 4 7% 5% 4 4 3 4 5% 28%	2660
December	1st to 10th	Night	21% 14% 4 9% 6% 5% 4 3 5% 5% 23%	2660
	11th to 20th	Night	23% 14% 4 8% 5% 4 4 3 3 5% 27%	3288
	21st to end	Night	23% 18% 6% 9% 4 3 3 2 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	57% 7% 10% 15% 10% 1	3119
	11th to 20th	Day	56% 8% 11% 12% 11% 3	3264
	21st to end	Day	48% 5% 9% 19% 15% 4	4166
April	1st to 10th	Day	55% 5% 11% 15% 12% 2	2280
	11th to 20th	Day	48% 6% 11% 21% 12% 3	2271
	21st to end	Day	54% 6% 9% 16% 13% 3	2470
May	1st to 10th	Day	48% 7% 11% 19% 13% 1	4366
	11th to 20th	Day	44% 9% 20% 18% 9% 1	4402
	21st to end	Day	46% 8% 12% 18% 15% 2	4837
June	1st to 10th	Day	52% 9% 11% 17% 9% 2	2660
	11th to 20th	Day	45% 7% 14% 20% 11% 2	2660
	21st to end	Day	56% 8% 10% 15% 9%	2660
July	1st to 10th	Day	45% 8% 15% 23% 9%	4370
	11th to 20th	Day	44% 8% 20% 21% 6%	4365
	21st to end	Day	40% 8% 16% 27% 9%	4661
August	1st to 10th	Day	45% 10% 17% 20% 7%	4409
	11th to 20th	Day	44% 9% 20% 21% 5%	4153
	21st to end	Day	43% 7% 16% 20% 14% 1	4180
September	1st to 10th	Day	38% 6% 19% 25% 11% 1	2280
	11th to 20th	Day	37% 5% 16% 29% 11% 1	2174
	21st to end	Day	44% 7% 13% 26% 10%	2090
October	1st to 10th	Day	49% 5% 12% 24% 9% 1	1997
	11th to 20th	Day	56% 7% 14% 19% 4	1811
	21st to end	Day	56% 5% 13% 16% 8% 1	1881
November	1st to 10th	Day	51% 6% 15% 18% 9% 1	1680
	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	58% 6% 11% 14% 8% 3	3734
	11th to 20th	Night	59% 6% 8% 14% 11% 2	3694
	21st to end	Night	49% 6% 9% 21% 11% 4	3466
April	1st to 10th	Night	54% 4 11% 16% 14% 2	1900
	11th to 20th	Night	47% 6% 9% 21% 14% 2	1857
	21st to end	Night	50% 4 9% 18% 16% 3	1710
May	1st to 10th	Night	52% 8% 13% 17% 9% 2	2625
	11th to 20th	Night	43% 9% 16% 18% 12% 2	2496
	21st to end	Night	47% 7% 12% 17% 16% 1	2739
June	1st to 10th	Night	45% 8% 14% 20% 12% 1	1520
	11th to 20th	Night	45% 7% 12% 19% 13% 4	1520
	21st to end	Night	50% 8% 12% 17% 14%	1520
July	1st to 10th	Night	45% 8% 19% 19% 9% 1	2480
	11th to 20th	Night	42% 7% 19% 26% 6%	2472
	21st to end	Night	35% 7% 19% 27% 12%	2651
August	1st to 10th	Night	45% 8% 15% 24% 8%	2496
	11th to 20th	Night	44% 6% 20% 22% 8%	2705
	21st to end	Night	46% 6% 12% 23% 12%	3476
September	1st to 10th	Night	36% 7% 17% 26% 14% 1	1900
	11th to 20th	Night	34% 6% 17% 32% 10% 1	2005
	21st to end	Night	41% 6% 11% 29% 13%	2090
October	1st to 10th	Night	47% 5% 10% 25% 13% 1	2180
	11th to 20th	Night	49% 6% 15% 23% 7%	2368
	21st to end	Night	53% 6% 13% 19% 9% 1	2717
November	1st to 10th	Night	51% 6% 13% 20% 9% 1	2421
	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% 13% 35% 23% 6%	460
	11th to 20th	Day	22% 17% 36% 19% 6% 1	460
	21st to end	Day	27% 16% 30% 17% 7% 2	506
April	1st to 10th	Day	28% 14% 28% 23% 7% 1	460
	11th to 20th	Day	26% 16% 31% 20% 6% 2	452
	21st to end	Day	28% 15% 36% 14% 5% 2	460
May	1st to 10th	Day	26% 13% 35% 18% 6% 1	463
	11th to 20th	Day	21% 11% 33% 25% 8% 2	487
	21st to end	Day	21% 14% 36% 19% 8% 1	529
June	1st to 10th	Day	21% 13% 33% 22% 8% 2	490
	11th to 20th	Day	18% 12% 33% 23% 12% 2	490
	21st to end	Day	24% 10% 27% 25% 11% 2	490
July	1st to 10th	Day	16% 7% 32% 28% 14% 3	485
	11th to 20th	Day	15% 9% 30% 30% 14% 2	484
	21st to end	Day	14% 6% 29% 32% 16% 3	532
August	1st to 10th	Day	15% 7% 29% 29% 18% 3	486
	11th to 20th	Day	16% 5% 24% 32% 16% 6%	479
	21st to end	Day	17% 10% 28% 22% 17% 7%	539
September	1st to 10th	Day	17% 9% 33% 22% 14% 5%	490
	11th to 20th	Day	15% 9% 25% 26% 17% 8%	490
	21st to end	Day	23% 7% 29% 24% 11% 6%	490
October	1st to 10th	Day	25% 11% 27% 23% 12% 2	490
	11th to 20th	Day	25% 11% 33% 21% 10% 1	443
	21st to end	Day	30% 13% 31% 20% 7%	429
November	1st to 10th	Day	26% 13% 29% 25% 7% 1	368
	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% 30% 4	760
	11th to 20th	Night	23% 11% 35% 25% 6% 1	760
	21st to end	Night	21% 12% 33% 26% 7%	836
April	1st to 10th	Night	28% 11% 29% 27% 6%	760
	11th to 20th	Night	24% 13% 31% 25% 6% 1	733
	21st to end	Night	27% 12% 32% 23% 6%	570
May	1st to 10th	Night	26% 9% 32% 27% 5% 1	446
	11th to 20th	Night	23% 9% 29% 32% 7%	374
	21st to end	Night	22% 5% 38% 26% 9%	411
June	1st to 10th	Night	22% 6% 29% 34% 9%	380
	11th to 20th	Night	20% 5% 26% 36% 12% 1	380
	21st to end	Night	21% 4 25% 37% 12%	380
July	1st to 10th	Night	14% 3 29% 39% 15%	370
	11th to 20th	Night	14% 2 26% 41% 16% 1	368
	21st to end	Night	16% 4 21% 42% 16% 1	416
August	1st to 10th	Night	13% 3 17% 48% 18% 1	378
	11th to 20th	Night	16% 4 21% 37% 21% 1	496
	21st to end	Night	17% 4 27% 31% 19% 1	836
September	1st to 10th	Night	15% 4 26% 39% 14% 1	760
	11th to 20th	Night	17% 6% 23% 32% 20% 2	760
	21st to end	Night	21% 5% 29% 29% 15% 2	760
October	1st to 10th	Night	21% 8% 29% 31% 10%	760
	11th to 20th	Night	25% 8% 29% 28% 10% 1	760
	21st to end	Night	28% 9% 32% 25% 6%	836
November	1st to 10th	Night	23% 10% 30% 28% 7% 1	745
	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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