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 2024-11-04.

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% 5% 5% 5% 4 6% 7% 31%	102061
	Night	15% 11% 4 9% 6% 5% 5% 4 5% 6% 31%	96908
Transparency	Day	49% 8% 13% 20% 10% 1	105661
	Night	50% 8% 13% 19% 10% 1	101398
Seeing	Day	19% 12% 27% 23% 13% 5%	14875
	Night	19% 10% 28% 30% 12% 1	23756

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	16% 15% 7% 11% 6% 5% 5% 3 5% 5% 20%	2517
	11th to 20th	Day	11% 17% 6% 18% 11% 7% 5% 3 4 5% 12%	2748
	21st to end	Day	18% 23% 7% 11% 7% 5% 4 3 4 5% 13%	3124
February	1st to 10th	Day	13% 15% 5% 14% 8% 7% 7% 4 5% 5% 17%	1710
	11th to 20th	Day	11% 16% 6% 13% 9% 5% 5% 4 5% 6% 21%	1663
	21st to end	Day	15% 18% 5% 9% 6% 6% 5% 3 5% 5% 22%	1460
March	1st to 10th	Day	19% 12% 5% 9% 5% 4 4 2 4 5% 29%	3427
	11th to 20th	Day	11% 17% 7% 10% 5% 5% 5% 4 4 5% 26%	3480
	21st to end	Day	15% 11% 3 11% 5% 4 4 3 4 5% 35%	3815
April	1st to 10th	Day	18% 14% 4 9% 5% 4 4 3 5% 6% 28%	2232
	11th to 20th	Day	21% 10% 3 5% 3 3 4 3 5% 7% 35%	2360
	21st to end	Day	19% 11% 4 7% 5% 4 3 3 4 7% 33%	2470
May	1st to 10th	Day	18% 9% 3 7% 5% 4 4 4 5% 8% 34%	4108
	11th to 20th	Day	17% 9% 3 7% 4 4 4 4 6% 8% 33%	4366
	21st to end	Day	14% 5% 2 6% 4 4 3 4 5% 8% 46%	4837
June	1st to 10th	Day	17% 8% 3 6% 4 4 4 4 6% 7% 36%	2660
	11th to 20th	Day	13% 6% 2 5% 5% 4 6% 5% 6% 9% 41%	2785
	21st to end	Day	14% 7% 2 7% 5% 4 5% 4 7% 7% 39%	2850
July	1st to 10th	Day	11% 6% 2 7% 6% 5% 6% 5% 7% 9% 36%	4742
	11th to 20th	Day	11% 5% 2 6% 4 5% 4 5% 7% 9% 42%	4440
	21st to end	Day	8% 6% 2 6% 5% 5% 5% 4 6% 8% 43%	4509
August	1st to 10th	Day	13% 7% 3 7% 5% 5% 6% 4 6% 8% 37%	4104
	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%	1602
	11th to 20th	Day	13% 16% 5% 10% 7% 6% 5% 5% 6% 7% 21%	1520
	21st to end	Day	19% 18% 5% 10% 7% 6% 5% 4 5% 6% 15%	1520
December	1st to 10th	Day	15% 22% 7% 15% 7% 5% 5% 4 5% 5% 10%	1520
	11th to 20th	Day	16% 17% 5% 15% 7% 5% 6% 4 6% 5% 16%	1906
	21st to end	Day	28% 19% 7% 15% 6% 4 3 3 4 3 9%	2772
January	1st to 10th	Night	16% 18% 6% 12% 7% 6% 6% 4 4 6% 15%	4429
	11th to 20th	Night	13% 15% 6% 15% 11% 8% 5% 4 5% 5% 12%	4209
	21st to end	Night	18% 16% 8% 13% 9% 5% 5% 4 5% 5% 13%	4532
February	1st to 10th	Night	12% 19% 5% 11% 8% 5% 6% 5% 6% 5% 18%	2470
	11th to 20th	Night	12% 15% 6% 12% 7% 6% 5% 4 6% 5% 22%	2403
	21st to end	Night	13% 14% 5% 11% 6% 5% 4 5% 5% 7% 24%	1989
March	1st to 10th	Night	17% 11% 4 9% 5% 5% 4 3 4 6% 30%	3412
	11th to 20th	Night	12% 13% 4 8% 6% 5% 4 4 5% 7% 32%	3479
	21st to end	Night	15% 9% 4 10% 5% 5% 4 4 5% 6% 32%	3817
April	1st to 10th	Night	18% 13% 3 7% 5% 5% 4 4 5% 5% 31%	1948
	11th to 20th	Night	18% 8% 3 7% 5% 4 4 3 6% 6% 36%	1785
	21st to end	Night	17% 10% 4 7% 5% 5% 4 4 5% 5% 35%	1710
May	1st to 10th	Night	16% 7% 2 6% 5% 4 5% 3 5% 7% 40%	2833
	11th to 20th	Night	16% 6% 3 6% 4 4 5% 4 6% 6% 40%	2510
	21st to end	Night	10% 5% 2 5% 4 3 4 4 4 8% 51%	2738
June	1st to 10th	Night	14% 6% 2 7% 5% 5% 6% 4 6% 7% 40%	1520
	11th to 20th	Night	9% 4 2 5% 5% 5% 6% 5% 6% 9% 43%	1388
	21st to end	Night	11% 5% 3 6% 6% 4 4 3 6% 7% 44%	1330
July	1st to 10th	Night	5% 5% 3 6% 5% 4 5% 4 5% 7% 49%	2210
	11th to 20th	Night	12% 5% 2 5% 4 4 4 3 5% 7% 50%	2519
	21st to end	Night	7% 5% 2 5% 4 5% 4 5% 5% 7% 49%	3042
August	1st to 10th	Night	9% 5% 2 6% 5% 4 5% 3 6% 8% 46%	2825
	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% 7% 33%	2542
	11th to 20th	Night	15% 16% 5% 8% 6% 6% 6% 4 6% 7% 22%	2660
	21st to end	Night	19% 15% 4 10% 6% 5% 5% 4 6% 6% 19%	2660
December	1st to 10th	Night	19% 17% 6% 11% 8% 5% 5% 3 5% 6% 15%	2660
	11th to 20th	Night	15% 18% 6% 13% 7% 5% 5% 4 6% 6% 16%	3288
	21st to end	Night	27% 20% 6% 14% 6% 5% 4 2 4 4 9%	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	62% 9% 15% 11% 4	2518
	11th to 20th	Day	71% 9% 9% 8% 3	2748
	21st to end	Day	72% 8% 9% 8% 3	3124
February	1st to 10th	Day	68% 6% 9% 13% 3	1710
	11th to 20th	Day	63% 6% 11% 14% 6% 1	1672
	21st to end	Day	62% 7% 10% 14% 7% 1	1460
March	1st to 10th	Day	55% 7% 13% 15% 9%	3430
	11th to 20th	Day	57% 6% 12% 16% 7% 1	3480
	21st to end	Day	48% 8% 11% 18% 13% 2	3815
April	1st to 10th	Day	58% 5% 9% 18% 10% 1	2232
	11th to 20th	Day	49% 6% 9% 21% 15% 1	2360
	21st to end	Day	51% 6% 11% 18% 12% 3	2470
May	1st to 10th	Day	45% 7% 11% 21% 13% 1	4120
	11th to 20th	Day	45% 9% 14% 21% 10% 1	4370
	21st to end	Day	36% 8% 13% 22% 18% 3	4837
June	1st to 10th	Day	43% 8% 12% 21% 15% 1	2660
	11th to 20th	Day	37% 8% 13% 24% 17% 1	2785
	21st to end	Day	42% 8% 13% 23% 14% 1	2850
July	1st to 10th	Day	40% 9% 16% 20% 14% 1	4668
	11th to 20th	Day	34% 8% 15% 32% 10% 1	4365
	21st to end	Day	37% 8% 12% 26% 17% 1	4365
August	1st to 10th	Day	42% 8% 15% 24% 11% 1	4091
	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	52% 10% 15% 16% 6%	1602
	11th to 20th	Day	60% 9% 13% 11% 6% 1	1520
	21st to end	Day	68% 9% 11% 10% 2	1520
December	1st to 10th	Day	73% 9% 10% 7% 1	1520
	11th to 20th	Day	67% 9% 11% 10% 2	1906
	21st to end	Day	78% 7% 7% 6% 1	2772
January	1st to 10th	Night	65% 11% 13% 7% 3	4429
	11th to 20th	Night	69% 11% 10% 7% 2	4209
	21st to end	Night	71% 7% 11% 8% 3	4532
February	1st to 10th	Night	64% 7% 11% 14% 3	2470
	11th to 20th	Night	61% 7% 12% 15% 5%	2405
	21st to end	Night	56% 8% 13% 14% 8% 1	1989
March	1st to 10th	Night	53% 6% 12% 20% 7% 1	3422
	11th to 20th	Night	48% 8% 16% 19% 8% 1	3480
	21st to end	Night	45% 10% 13% 19% 12% 1	3817
April	1st to 10th	Night	54% 5% 10% 18% 12% 1	1948
	11th to 20th	Night	48% 6% 10% 19% 16% 2	1785
	21st to end	Night	50% 5% 11% 16% 16% 1	1710
May	1st to 10th	Night	43% 7% 13% 18% 16% 3	2840
	11th to 20th	Night	40% 10% 14% 23% 12% 2	2511
	21st to end	Night	31% 9% 13% 26% 20% 2	2739
June	1st to 10th	Night	42% 7% 12% 22% 16% 2	1520
	11th to 20th	Night	36% 7% 14% 23% 19% 1	1388
	21st to end	Night	38% 8% 12% 26% 15% 1	1330
July	1st to 10th	Night	32% 6% 15% 26% 18% 3	2175
	11th to 20th	Night	32% 7% 12% 34% 14% 1	2472
	21st to end	Night	31% 10% 13% 30% 16% 1	2945
August	1st to 10th	Night	35% 7% 14% 28% 15% 1	2814
	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	49% 8% 14% 20% 8% 1	2542
	11th to 20th	Night	58% 8% 13% 13% 6% 1	2660
	21st to end	Night	62% 9% 15% 11% 2	2660
December	1st to 10th	Night	68% 8% 12% 9% 2	2660
	11th to 20th	Night	66% 9% 13% 10% 2	3288
	21st to end	Night	79% 6% 8% 6% 2	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	17% 19% 33% 22% 7% 3	180
	11th to 20th	Day	23% 18% 34% 18% 6% 1	245
	21st to end	Day	24% 15% 33% 23% 5% 1	297
February	1st to 10th	Day	23% 21% 38% 14% 4	270
	11th to 20th	Day	23% 19% 41% 14% 2	270
	21st to end	Day	29% 23% 34% 13% 1	225
March	1st to 10th	Day	23% 16% 36% 21% 4	455
	11th to 20th	Day	20% 19% 32% 22% 7% 1	460
	21st to end	Day	28% 13% 31% 19% 8% 1	506
April	1st to 10th	Day	25% 16% 32% 17% 8% 2	460
	11th to 20th	Day	32% 14% 22% 18% 9% 5%	452
	21st to end	Day	28% 13% 27% 20% 9% 3	460
May	1st to 10th	Day	21% 11% 28% 25% 11% 5%	463
	11th to 20th	Day	17% 10% 26% 25% 16% 5%	487
	21st to end	Day	15% 11% 25% 27% 18% 5%	529
June	1st to 10th	Day	18% 12% 24% 28% 16% 2	490
	11th to 20th	Day	15% 10% 26% 29% 17% 3	615
	21st to end	Day	18% 9% 29% 27% 13% 4	680
July	1st to 10th	Day	12% 8% 22% 32% 20% 6%	666
	11th to 20th	Day	12% 6% 25% 30% 16% 11%	484
	21st to end	Day	9% 6% 24% 35% 17% 8%	532
August	1st to 10th	Day	11% 8% 19% 26% 24% 13%	486
	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	21% 21% 30% 18% 9% 1	238
	11th to 20th	Day	23% 20% 32% 18% 6% 1	180
	21st to end	Day	29% 17% 35% 16% 4	180
December	1st to 10th	Day	27% 17% 33% 18% 4 1	180
	11th to 20th	Day	27% 20% 28% 19% 4 1	180
	21st to end	Day	30% 18% 36% 15% 1	198
January	1st to 10th	Night	23% 15% 35% 20% 7% 1	760
	11th to 20th	Night	23% 12% 33% 25% 6%	760
	21st to end	Night	18% 10% 31% 31% 9% 1	836
February	1st to 10th	Night	21% 13% 38% 24% 4	760
	11th to 20th	Night	20% 12% 36% 27% 5%	743
	21st to end	Night	21% 15% 33% 26% 5%	628
March	1st to 10th	Night	21% 13% 34% 27% 5%	760
	11th to 20th	Night	20% 14% 32% 27% 6% 1	760
	21st to end	Night	22% 11% 30% 27% 10%	836
April	1st to 10th	Night	24% 13% 33% 26% 5%	760
	11th to 20th	Night	21% 9% 31% 27% 10% 1	661
	21st to end	Night	22% 9% 25% 30% 13%	570
May	1st to 10th	Night	19% 4 23% 37% 16% 1	570
	11th to 20th	Night	18% 5% 24% 41% 11% 1	389
	21st to end	Night	11% 5% 24% 45% 15%	411
June	1st to 10th	Night	16% 6% 25% 40% 12% 1	380
	11th to 20th	Night	11% 4 22% 48% 15%	380
	21st to end	Night	13% 5% 23% 40% 18% 1	380
July	1st to 10th	Night	7% 3 18% 50% 21% 1	370
	11th to 20th	Night	10% 4 21% 43% 21% 1	368
	21st to end	Night	9% 3 18% 43% 26% 1	592
August	1st to 10th	Night	10% 3 14% 42% 28% 2	567
	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% 10% 27% 28% 11%	755
	11th to 20th	Night	21% 16% 32% 24% 8% 1	760
	21st to end	Night	26% 15% 28% 26% 5%	760
December	1st to 10th	Night	28% 15% 33% 19% 5% 1	760
	11th to 20th	Night	22% 14% 36% 21% 5% 1	760
	21st to end	Night	30% 16% 30% 21% 3	836

Page generated at 2024-11-01 22:47:39. Version ac07

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