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 2025-05-26.

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% 4 4 5% 6% 31%	114023
	Night	17% 11% 4 9% 5% 4 4 3 5% 6% 31%	115246
Transparency	Day	50% 7% 13% 19% 10% 1	117516
	Night	53% 6% 12% 19% 10% 1	119917
Seeing	Day	23% 12% 32% 22% 9% 2	15162
	Night	23% 8% 31% 29% 9% 1	24161

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	14% 18% 6% 11% 6% 5% 4 3 5% 4 22%	3597
	11th to 20th	Day	12% 14% 6% 15% 8% 6% 5% 3 4 4 24%	3570
	21st to end	Day	9% 11% 7% 12% 6% 4 4 3 5% 6% 31%	3960
February	1st to 10th	Day	12% 17% 5% 11% 7% 5% 4 3 4 5% 27%	1685
	11th to 20th	Day	13% 15% 5% 13% 5% 5% 4 3 4 5% 28%	1871
	21st to end	Day	16% 15% 5% 10% 6% 5% 4 3 4 5% 28%	1650
March	1st to 10th	Day	22% 14% 5% 11% 7% 4 4 3 3 4 25%	4476
	11th to 20th	Day	11% 14% 4 9% 5% 5% 4 4 5% 6% 32%	4666
	21st to end	Day	17% 14% 4 9% 5% 4 4 3 3 5% 33%	5970
April	1st to 10th	Day	21% 12% 4 7% 5% 4 4 3 4 5% 31%	2400
	11th to 20th	Day	22% 8% 3 6% 4 4 4 3 5% 5% 36%	2392
	21st to end	Day	22% 10% 3 7% 4 4 5% 3 5% 6% 30%	2600
May	1st to 10th	Day	22% 8% 3 6% 5% 4 4 3 5% 7% 33%	4490
	11th to 20th	Day	17% 7% 3 7% 5% 4 5% 4 6% 8% 34%	4538
	21st to end	Day	17% 7% 3 8% 5% 5% 6% 4 6% 8% 32%	4907
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 4 5% 34%	1761
	11th to 20th	Day	20% 12% 4 7% 5% 5% 4 3 5% 6% 29%	1723
	21st to end	Day	20% 16% 4 8% 6% 5% 3 4 4 6% 25%	1600
December	1st to 10th	Day	20% 17% 5% 11% 7% 5% 4 3 4 4 22%	2600
	11th to 20th	Day	18% 14% 4 9% 5% 4 3 3 4 5% 30%	2986
	21st to end	Day	19% 14% 5% 10% 6% 4 4 4 4 4 26%	3960
January	1st to 10th	Night	14% 20% 7% 13% 6% 5% 4 3 4 5% 21%	6349
	11th to 20th	Night	10% 17% 7% 15% 7% 5% 4 3 4 4 24%	6315
	21st to end	Night	10% 12% 4 13% 7% 6% 5% 4 5% 6% 28%	6996
February	1st to 10th	Night	12% 14% 5% 10% 7% 5% 4 3 5% 5% 29%	2715
	11th to 20th	Night	12% 14% 4 13% 6% 4 4 3 4 5% 29%	2413
	21st to end	Night	15% 12% 4 9% 6% 5% 4 3 5% 5% 31%	1980
March	1st to 10th	Night	23% 13% 4 12% 6% 4 4 3 4 4 24%	5364
	11th to 20th	Night	14% 14% 4 9% 5% 4 5% 4 5% 7% 29%	5277
	21st to end	Night	15% 11% 4 9% 6% 5% 5% 4 5% 5% 31%	4962
April	1st to 10th	Night	23% 10% 4 7% 4 4 4 4 4 6% 31%	2000
	11th to 20th	Night	20% 8% 3 7% 5% 4 3 4 5% 6% 36%	1956
	21st to end	Night	22% 10% 2 7% 4 3 3 3 4 7% 35%	1800
May	1st to 10th	Night	22% 9% 3 7% 4 5% 5% 4 5% 6% 30%	2702
	11th to 20th	Night	22% 5% 2 6% 4 4 4 3 5% 7% 37%	2575
	21st to end	Night	18% 6% 3 7% 6% 5% 4 4 5% 8% 33%	2784
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%	2537
	11th to 20th	Night	19% 10% 3 8% 5% 4 5% 4 5% 6% 32%	2675
	21st to end	Night	22% 14% 4 7% 5% 4 4 3 4 5% 27%	2800
December	1st to 10th	Night	16% 13% 5% 10% 6% 6% 5% 4 6% 6% 23%	4580
	11th to 20th	Night	24% 12% 4 8% 5% 4 4 3 3 4 27%	5208
	21st to end	Night	21% 17% 6% 9% 4 3 3 2 3 4 28%	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	63% 6% 11% 16% 4	3598
	11th to 20th	Day	63% 5% 10% 14% 6% 2	3600
	21st to end	Day	53% 6% 8% 18% 14% 1	3960
February	1st to 10th	Day	60% 4 9% 16% 8% 2	1685
	11th to 20th	Day	59% 4 13% 13% 11% 1	1880
	21st to end	Day	59% 5% 8% 16% 9% 3	1650
March	1st to 10th	Day	62% 5% 8% 11% 11% 3	4479
	11th to 20th	Day	51% 7% 16% 12% 12% 2	4666
	21st to end	Day	54% 4 7% 16% 16% 3	5970
April	1st to 10th	Day	54% 5% 10% 15% 13% 2	2400
	11th to 20th	Day	48% 6% 10% 21% 12% 3	2392
	21st to end	Day	53% 6% 9% 16% 13% 3	2600
May	1st to 10th	Day	49% 7% 11% 19% 13% 1	4504
	11th to 20th	Day	44% 8% 19% 18% 9% 2	4542
	21st to end	Day	47% 8% 11% 17% 15% 2	4907
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	46% 7% 13% 27% 6%	3322
	11th to 20th	Day	48% 6% 17% 23% 5%	2988
	21st to end	Day	46% 6% 21% 19% 8% 1	3081
November	1st to 10th	Day	51% 6% 14% 19% 9% 1	1761
	11th to 20th	Day	54% 6% 12% 17% 11%	1723
	21st to end	Day	60% 7% 12% 15% 6% 1	1600
December	1st to 10th	Day	66% 4 9% 17% 5%	2600
	11th to 20th	Day	56% 5% 8% 18% 13%	2986
	21st to end	Day	60% 6% 8% 15% 10%	3960
January	1st to 10th	Night	66% 5% 11% 13% 4	6349
	11th to 20th	Night	64% 6% 10% 15% 4 1	6360
	21st to end	Night	56% 5% 10% 15% 14%	6996
February	1st to 10th	Night	56% 5% 10% 17% 10% 1	2715
	11th to 20th	Night	57% 6% 11% 16% 10% 1	2415
	21st to end	Night	54% 4 9% 18% 13% 2	1980
March	1st to 10th	Night	63% 4 8% 11% 10% 3	5374
	11th to 20th	Night	53% 6% 13% 14% 11% 2	5278
	21st to end	Night	53% 5% 7% 22% 10% 2	4962
April	1st to 10th	Night	54% 4 11% 16% 14% 2	2000
	11th to 20th	Night	48% 6% 9% 21% 15% 2	1956
	21st to end	Night	50% 4 9% 19% 15% 3	1800
May	1st to 10th	Night	52% 8% 13% 17% 8% 2	2708
	11th to 20th	Night	43% 9% 16% 18% 12% 2	2576
	21st to end	Night	47% 7% 12% 17% 15% 1	2785
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	49% 5% 13% 24% 9%	3635
	11th to 20th	Night	43% 6% 14% 30% 7%	3930
	21st to end	Night	44% 5% 18% 19% 12% 2	4467
November	1st to 10th	Night	51% 6% 13% 20% 8% 1	2537
	11th to 20th	Night	52% 6% 12% 18% 10% 1	2675
	21st to end	Night	60% 5% 11% 16% 8%	2800
December	1st to 10th	Night	61% 6% 14% 15% 5%	4580
	11th to 20th	Night	61% 5% 8% 17% 9%	5208
	21st to end	Night	62% 4 6% 16% 11% 1	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	28% 14% 34% 21% 5%	200
	11th to 20th	Day	24% 15% 34% 21% 6% 1	200
	21st to end	Day	18% 10% 42% 21% 8% 1	220
February	1st to 10th	Day	26% 20% 38% 15% 2	243
	11th to 20th	Day	24% 15% 38% 19% 3	419
	21st to end	Day	25% 16% 34% 20% 4	414
March	1st to 10th	Day	25% 13% 34% 22% 6%	500
	11th to 20th	Day	21% 17% 37% 19% 6% 1	500
	21st to end	Day	28% 17% 29% 17% 7% 2	550
April	1st to 10th	Day	29% 14% 29% 22% 6% 1	500
	11th to 20th	Day	27% 16% 30% 19% 6% 2	492
	21st to end	Day	28% 17% 35% 13% 5% 1	500
May	1st to 10th	Day	28% 13% 35% 17% 6% 1	503
	11th to 20th	Day	22% 11% 32% 25% 8% 2	527
	21st to end	Day	22% 15% 35% 19% 8% 1	549
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% 6% 1	395
	11th to 20th	Day	27% 12% 33% 21% 7%	323
	21st to end	Day	30% 17% 34% 15% 4 1	200
December	1st to 10th	Day	31% 13% 27% 22% 7% 2	200
	11th to 20th	Day	28% 17% 34% 20% 2 2	200
	21st to end	Day	29% 19% 29% 16% 5% 2	220
January	1st to 10th	Night	27% 9% 34% 26% 5%	800
	11th to 20th	Night	27% 9% 35% 23% 7%	800
	21st to end	Night	17% 6% 34% 36% 6% 1	880
February	1st to 10th	Night	19% 9% 39% 27% 6% 1	800
	11th to 20th	Night	21% 12% 37% 25% 5% 1	783
	21st to end	Night	21% 10% 33% 30% 6%	660
March	1st to 10th	Night	24% 11% 31% 29% 5%	800
	11th to 20th	Night	23% 11% 36% 25% 5% 1	800
	21st to end	Night	22% 12% 33% 26% 7%	880
April	1st to 10th	Night	28% 12% 29% 26% 6%	800
	11th to 20th	Night	24% 13% 31% 25% 6% 1	772
	21st to end	Night	27% 12% 33% 22% 5%	600
May	1st to 10th	Night	27% 10% 31% 27% 5% 1	469
	11th to 20th	Night	24% 8% 29% 31% 7%	394
	21st to end	Night	22% 5% 38% 26% 9%	423
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	29% 9% 32% 25% 6%	836
November	1st to 10th	Night	24% 10% 30% 28% 7% 1	780
	11th to 20th	Night	22% 11% 33% 24% 10% 1	800
	21st to end	Night	30% 12% 28% 25% 5% 1	800
December	1st to 10th	Night	29% 7% 32% 25% 8%	800
	11th to 20th	Night	27% 9% 35% 22% 6% 1	800
	21st to end	Night	31% 10% 29% 23% 6%	880

Page generated at 2025-05-23 09:21:01. Version ac07

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