Camp Saulaine
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Saulaine clear sky chart from 2005-11-06 to 2025-08-05.

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	15% 11% 4 9% 6% 5% 5% 4 5% 7% 31%	126723
	Night	14% 11% 4 10% 6% 5% 5% 4 5% 6% 29%	121277
Transparency	Day	50% 8% 12% 19% 10% 1	130313
	Night	51% 8% 13% 18% 10% 1	125776
Seeing	Day	19% 13% 28% 23% 12% 5%	15812
	Night	20% 10% 28% 30% 12% 1	24666

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% 13% 6% 16% 10% 7% 6% 3 5% 4 16%	3597
	11th to 20th	Day	10% 15% 7% 20% 12% 9% 6% 3 4 4 10%	3906
	21st to end	Day	14% 18% 7% 15% 8% 7% 5% 3 4 5% 13%	4466
February	1st to 10th	Day	13% 15% 5% 15% 9% 7% 6% 4 5% 5% 17%	1800
	11th to 20th	Day	11% 16% 6% 14% 9% 6% 5% 4 5% 6% 20%	1753
	21st to end	Day	14% 19% 5% 10% 6% 6% 5% 3 5% 5% 21%	1535
March	1st to 10th	Day	19% 11% 5% 10% 6% 5% 5% 3 4 5% 28%	4927
	11th to 20th	Day	11% 14% 6% 10% 5% 5% 5% 4 5% 7% 27%	4980
	21st to end	Day	17% 15% 4 10% 4 4 3 3 3 4 31%	5465
April	1st to 10th	Day	18% 14% 4 9% 5% 4 4 3 5% 5% 29%	2350
	11th to 20th	Day	21% 11% 3 5% 3 3 4 3 5% 7% 34%	2486
	21st to end	Day	19% 11% 4 7% 5% 4 4 3 4 7% 33%	2600
May	1st to 10th	Day	18% 9% 3 7% 4 4 4 3 5% 7% 35%	5888
	11th to 20th	Day	17% 10% 3 7% 4 4 4 4 5% 7% 35%	6272
	21st to end	Day	19% 7% 2 6% 4 4 3 3 5% 7% 38%	6949
June	1st to 10th	Day	17% 8% 3 6% 4 4 5% 4 6% 7% 37%	2800
	11th to 20th	Day	12% 6% 2 5% 5% 4 5% 5% 6% 9% 41%	2932
	21st to end	Day	14% 7% 2 7% 5% 4 4 4 7% 7% 39%	3000
July	1st to 10th	Day	10% 7% 3 7% 6% 5% 5% 5% 7% 8% 37%	6801
	11th to 20th	Day	9% 5% 2 6% 4 5% 4 5% 6% 8% 45%	6360
	21st to end	Day	8% 5% 2 6% 4 4 5% 4 6% 8% 48%	6481
August	1st to 10th	Day	13% 7% 3 7% 5% 5% 6% 4 6% 8% 38%	4156
	11th to 20th	Day	11% 9% 3 7% 4 5% 5% 4 7% 10% 35%	4044
	21st to end	Day	11% 6% 2 6% 4 5% 4 4 7% 9% 43%	4389
September	1st to 10th	Day	14% 6% 3 7% 5% 4 5% 4 5% 8% 40%	2280
	11th to 20th	Day	12% 6% 2 6% 4 5% 4 5% 6% 8% 43%	2148
	21st to end	Day	14% 7% 3 8% 6% 6% 5% 4 6% 7% 35%	2063
October	1st to 10th	Day	18% 8% 3 8% 5% 5% 4 3 6% 6% 34%	1900
	11th to 20th	Day	19% 11% 4 10% 6% 5% 5% 4 5% 7% 25%	1900
	21st to end	Day	24% 16% 3 10% 6% 4 4 3 5% 5% 19%	2090
November	1st to 10th	Day	14% 14% 4 9% 5% 5% 4 4 6% 7% 27%	1659
	11th to 20th	Day	13% 16% 5% 11% 7% 6% 5% 5% 6% 7% 21%	1600
	21st to end	Day	19% 19% 5% 10% 7% 6% 5% 4 5% 5% 15%	1600
December	1st to 10th	Day	16% 24% 8% 15% 7% 5% 5% 4 4 4 8%	2600
	11th to 20th	Day	15% 20% 6% 15% 6% 4 5% 3 4 4 17%	2986
	21st to end	Day	25% 18% 6% 15% 5% 4 4 3 4 4 10%	3960
January	1st to 10th	Night	13% 15% 6% 16% 9% 7% 6% 4 5% 6% 14%	6349
	11th to 20th	Night	12% 15% 6% 18% 12% 8% 6% 4 5% 5% 10%	5976
	21st to end	Night	14% 14% 7% 15% 9% 6% 5% 4 5% 6% 16%	6490
February	1st to 10th	Night	12% 18% 5% 12% 8% 5% 6% 4 6% 5% 18%	2600
	11th to 20th	Night	11% 15% 6% 12% 7% 6% 5% 4 6% 5% 21%	2533
	21st to end	Night	13% 14% 5% 11% 6% 5% 5% 5% 5% 7% 24%	2090
March	1st to 10th	Night	16% 11% 5% 11% 7% 6% 5% 3 5% 6% 26%	4912
	11th to 20th	Night	9% 11% 4 8% 6% 6% 5% 5% 7% 8% 32%	4979
	21st to end	Night	19% 11% 4 11% 5% 4 4 4 5% 5% 28%	5467
April	1st to 10th	Night	18% 13% 3 8% 5% 5% 4 4 5% 5% 30%	2050
	11th to 20th	Night	17% 9% 4 7% 5% 4 4 3 6% 5% 36%	1880
	21st to end	Night	17% 10% 4 7% 5% 5% 3 4 5% 6% 35%	1800
May	1st to 10th	Night	18% 8% 3 7% 5% 4 4 3 6% 7% 36%	4053
	11th to 20th	Night	13% 6% 2 7% 4 4 4 4 6% 6% 42%	3604
	21st to end	Night	18% 6% 2 5% 4 3 4 3 4 7% 43%	3926
June	1st to 10th	Night	13% 6% 2 6% 5% 5% 6% 4 6% 7% 41%	1600
	11th to 20th	Night	10% 4 2 6% 5% 5% 6% 5% 6% 9% 43%	1461
	21st to end	Night	12% 5% 3 6% 6% 4 5% 3 6% 7% 44%	1400
July	1st to 10th	Night	8% 7% 3 6% 5% 4 5% 4 5% 8% 46%	3160
	11th to 20th	Night	11% 5% 2 5% 4 4 4 3 5% 7% 50%	3599
	21st to end	Night	8% 5% 2 5% 4 4 4 4 5% 8% 51%	4355
August	1st to 10th	Night	9% 5% 2 7% 5% 4 5% 3 5% 8% 47%	2861
	11th to 20th	Night	13% 6% 2 5% 3 3 4 3 5% 8% 48%	2785
	21st to end	Night	11% 6% 2 6% 3 3 4 4 6% 8% 47%	3220
September	1st to 10th	Night	10% 6% 2 6% 4 4 5% 4 5% 8% 46%	1900
	11th to 20th	Night	11% 4 2 6% 3 3 3 3 5% 7% 52%	2028
	21st to end	Night	16% 7% 2 7% 4 4 5% 3 5% 5% 41%	2115
October	1st to 10th	Night	18% 7% 3 7% 4 4 5% 4 5% 5% 38%	2280
	11th to 20th	Night	18% 9% 3 8% 6% 5% 5% 4 5% 6% 32%	2280
	21st to end	Night	22% 13% 4 8% 5% 4 5% 4 6% 6% 23%	2508
November	1st to 10th	Night	17% 10% 4 7% 4 5% 5% 4 5% 6% 32%	2632
	11th to 20th	Night	15% 16% 5% 8% 7% 6% 6% 4 6% 7% 22%	2800
	21st to end	Night	19% 16% 4 10% 6% 5% 5% 4 6% 6% 18%	2800
December	1st to 10th	Night	17% 20% 7% 14% 8% 5% 5% 4 5% 5% 10%	4580
	11th to 20th	Night	13% 19% 7% 14% 7% 5% 5% 4 5% 5% 16%	5208
	21st to end	Night	23% 19% 6% 15% 6% 5% 4 3 4 4 11%	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	60% 11% 14% 12% 3	3598
	11th to 20th	Day	72% 9% 10% 6% 3	3940
	21st to end	Day	68% 9% 10% 8% 5%	4466
February	1st to 10th	Day	68% 6% 8% 14% 3	1800
	11th to 20th	Day	64% 6% 11% 13% 6% 1	1762
	21st to end	Day	62% 7% 10% 14% 7% 1	1535
March	1st to 10th	Day	55% 7% 14% 12% 11%	4930
	11th to 20th	Day	53% 7% 15% 17% 7% 2	4980
	21st to end	Day	54% 7% 9% 17% 12% 1	5465
April	1st to 10th	Day	58% 5% 9% 18% 10% 1	2350
	11th to 20th	Day	49% 6% 9% 22% 14% 1	2486
	21st to end	Day	51% 6% 11% 18% 12% 3	2600
May	1st to 10th	Day	46% 7% 12% 19% 11% 5%	5897
	11th to 20th	Day	47% 8% 11% 16% 18% 1	6276
	21st to end	Day	44% 7% 12% 21% 14% 3	6949
June	1st to 10th	Day	43% 8% 12% 21% 15% 1	2800
	11th to 20th	Day	38% 8% 13% 24% 16% 1	2932
	21st to end	Day	42% 8% 13% 23% 13% 1	3000
July	1st to 10th	Day	40% 9% 15% 21% 14% 1	6728
	11th to 20th	Day	32% 8% 13% 30% 16% 1	6285
	21st to end	Day	32% 8% 13% 31% 15% 1	6295
August	1st to 10th	Day	42% 8% 15% 24% 11% 1	4143
	11th to 20th	Day	41% 9% 17% 24% 9%	4083
	21st to end	Day	35% 8% 15% 32% 10% 1	4389
September	1st to 10th	Day	41% 8% 13% 26% 10% 2	2280
	11th to 20th	Day	37% 8% 14% 28% 13% 1	2148
	21st to end	Day	46% 9% 12% 24% 8%	2063
October	1st to 10th	Day	42% 7% 14% 24% 12% 1	3160
	11th to 20th	Day	43% 7% 16% 21% 12%	3140
	21st to end	Day	59% 9% 14% 15% 4	3428
November	1st to 10th	Day	53% 10% 14% 17% 7%	1659
	11th to 20th	Day	59% 9% 13% 12% 6% 1	1600
	21st to end	Day	68% 9% 11% 10% 2	1600
December	1st to 10th	Day	76% 9% 9% 5% 1	2600
	11th to 20th	Day	67% 8% 10% 9% 5%	2986
	21st to end	Day	76% 7% 6% 8% 4	3960
January	1st to 10th	Night	62% 11% 13% 11% 3	6349
	11th to 20th	Night	68% 12% 11% 7% 3	6017
	21st to end	Night	64% 9% 11% 8% 7%	6490
February	1st to 10th	Night	64% 8% 11% 14% 4	2600
	11th to 20th	Night	61% 7% 12% 15% 5%	2535
	21st to end	Night	56% 8% 13% 15% 8%	2090
March	1st to 10th	Night	55% 7% 11% 16% 8% 2	4922
	11th to 20th	Night	44% 8% 20% 19% 8% 2	4980
	21st to end	Night	51% 9% 12% 16% 12% 2	5467
April	1st to 10th	Night	54% 5% 11% 18% 11% 1	2050
	11th to 20th	Night	48% 6% 10% 19% 16% 2	1880
	21st to end	Night	50% 5% 11% 17% 16% 1	1800
May	1st to 10th	Night	47% 7% 12% 14% 15% 6%	4060
	11th to 20th	Night	39% 9% 13% 22% 16% 2	3605
	21st to end	Night	40% 8% 12% 25% 14% 1	3927
June	1st to 10th	Night	41% 7% 11% 23% 17% 2	1600
	11th to 20th	Night	36% 7% 15% 22% 19% 1	1461
	21st to end	Night	38% 9% 12% 26% 15% 1	1400
July	1st to 10th	Night	35% 7% 14% 26% 16% 2	3125
	11th to 20th	Night	31% 7% 12% 30% 18% 1	3552
	21st to end	Night	30% 8% 10% 33% 17% 1	4226
August	1st to 10th	Night	35% 7% 13% 28% 16% 1	2850
	11th to 20th	Night	34% 7% 18% 27% 13% 1	2812
	21st to end	Night	33% 8% 15% 31% 13% 1	3220
September	1st to 10th	Night	34% 9% 15% 29% 13% 1	1900
	11th to 20th	Night	30% 8% 14% 31% 17% 1	2028
	21st to end	Night	44% 7% 13% 26% 10%	2115
October	1st to 10th	Night	34% 7% 12% 26% 21% 1	3800
	11th to 20th	Night	42% 7% 16% 23% 12%	3779
	21st to end	Night	45% 10% 17% 21% 7%	4120
November	1st to 10th	Night	50% 8% 14% 20% 8% 1	2632
	11th to 20th	Night	58% 8% 13% 13% 6% 1	2800
	21st to end	Night	63% 9% 15% 11% 2	2800
December	1st to 10th	Night	70% 10% 11% 8% 2	4580
	11th to 20th	Night	66% 9% 10% 10% 5%	5208
	21st to end	Night	74% 7% 8% 7% 4	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	18% 20% 35% 20% 6% 3	200
	11th to 20th	Day	22% 18% 34% 18% 6% 1	273
	21st to end	Day	22% 19% 33% 21% 5% 1	330
February	1st to 10th	Day	24% 22% 36% 14% 4	300
	11th to 20th	Day	25% 21% 39% 12% 2	300
	21st to end	Day	30% 22% 35% 12% 1	249
March	1st to 10th	Day	23% 17% 36% 20% 4 1	495
	11th to 20th	Day	21% 19% 32% 21% 6% 1	500
	21st to end	Day	30% 13% 30% 18% 7% 1	550
April	1st to 10th	Day	26% 17% 31% 16% 8% 1	500
	11th to 20th	Day	32% 15% 22% 18% 9% 4	492
	21st to end	Day	28% 14% 27% 19% 9% 3	500
May	1st to 10th	Day	20% 12% 29% 24% 10% 4	503
	11th to 20th	Day	17% 10% 27% 24% 16% 5%	527
	21st to end	Day	17% 11% 25% 25% 17% 5%	573
June	1st to 10th	Day	18% 13% 26% 27% 15% 2	530
	11th to 20th	Day	15% 10% 27% 29% 16% 3	662
	21st to end	Day	18% 9% 29% 26% 13% 4	730
July	1st to 10th	Day	11% 8% 23% 32% 20% 5%	716
	11th to 20th	Day	12% 7% 25% 31% 16% 10%	524
	21st to end	Day	9% 7% 26% 34% 17% 8%	576
August	1st to 10th	Day	10% 7% 19% 26% 24% 13%	502
	11th to 20th	Day	11% 5% 20% 25% 24% 14%	479
	21st to end	Day	15% 6% 21% 28% 19% 11%	539
September	1st to 10th	Day	14% 9% 22% 23% 21% 11%	490
	11th to 20th	Day	8% 8% 21% 25% 22% 16%	490
	21st to end	Day	14% 10% 26% 24% 20% 6%	490
October	1st to 10th	Day	22% 10% 26% 21% 13% 8%	490
	11th to 20th	Day	21% 16% 31% 21% 10% 1	490
	21st to end	Day	30% 15% 28% 21% 6% 1	539
November	1st to 10th	Day	23% 21% 29% 18% 9% 1	253
	11th to 20th	Day	24% 22% 31% 17% 6% 1	200
	21st to end	Day	28% 18% 35% 16% 4	200
December	1st to 10th	Day	27% 18% 33% 17% 4 2	200
	11th to 20th	Day	28% 21% 28% 19% 4 1	200
	21st to end	Day	30% 17% 35% 15% 2	220
January	1st to 10th	Night	22% 16% 35% 19% 7% 1	800
	11th to 20th	Night	22% 13% 34% 25% 6%	800
	21st to end	Night	19% 11% 31% 30% 8% 1	880
February	1st to 10th	Night	21% 14% 38% 23% 3	800
	11th to 20th	Night	21% 13% 35% 26% 5%	783
	21st to end	Night	20% 16% 33% 26% 4	660
March	1st to 10th	Night	22% 13% 34% 26% 5%	800
	11th to 20th	Night	20% 15% 33% 26% 6% 1	800
	21st to end	Night	23% 12% 29% 26% 10%	880
April	1st to 10th	Night	24% 13% 33% 26% 5%	800
	11th to 20th	Night	21% 11% 30% 27% 10% 1	696
	21st to end	Night	22% 10% 25% 30% 13%	600
May	1st to 10th	Night	20% 4 24% 37% 15% 1	600
	11th to 20th	Night	18% 6% 26% 40% 11% 1	410
	21st to end	Night	13% 5% 23% 45% 15%	433
June	1st to 10th	Night	15% 6% 27% 40% 12% 1	400
	11th to 20th	Night	12% 5% 22% 48% 14%	400
	21st to end	Night	14% 5% 24% 40% 18% 1	400
July	1st to 10th	Night	7% 3 19% 49% 21% 1	390
	11th to 20th	Night	11% 4 20% 44% 21% 1	388
	21st to end	Night	9% 3 19% 43% 25% 1	623
August	1st to 10th	Night	10% 3 14% 42% 28% 2	579
	11th to 20th	Night	7% 2 13% 40% 34% 3	564
	21st to end	Night	14% 4 18% 35% 27% 2	684
September	1st to 10th	Night	12% 4 19% 38% 23% 4	760
	11th to 20th	Night	13% 5% 18% 34% 24% 6%	760
	21st to end	Night	18% 7% 19% 32% 19% 4	760
October	1st to 10th	Night	20% 7% 25% 29% 17% 2	760
	11th to 20th	Night	22% 11% 29% 27% 10% 1	760
	21st to end	Night	29% 11% 31% 23% 6%	836
November	1st to 10th	Night	23% 11% 27% 28% 10%	780
	11th to 20th	Night	20% 16% 32% 24% 7% 1	800
	21st to end	Night	26% 16% 28% 25% 5%	800
December	1st to 10th	Night	27% 16% 33% 18% 6% 1	800
	11th to 20th	Night	22% 15% 37% 21% 5% 1	800
	21st to end	Night	30% 16% 30% 21% 4	880

Page generated at 2025-08-02 01:32:27. Version ac07

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