Saint-Camille-de-Lellis
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saint-Camille-de-Lellis clear sky chart from 2005-11-06 to 2026-06-01.

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% 11% 4 9% 6% 5% 5% 4 6% 6% 27%	131636
	Night	14% 11% 4 10% 6% 5% 5% 4 5% 6% 28%	131579
Transparency	Day	56% 7% 11% 17% 8% 1	135102
	Night	57% 7% 11% 16% 8% 1	136201
Seeing	Day	27% 20% 31% 16% 6% 1	17463
	Night	24% 17% 32% 20% 6%	25903

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% 14% 7% 13% 7% 5% 5% 4 6% 6% 20%	4639
	11th to 20th	Day	9% 15% 8% 20% 10% 8% 5% 2 3 3 17%	4650
	21st to end	Day	5% 9% 6% 16% 8% 6% 7% 4 7% 7% 25%	5124
February	1st to 10th	Day	9% 14% 5% 14% 10% 8% 6% 4 5% 5% 20%	1754
	11th to 20th	Day	12% 14% 8% 14% 8% 6% 5% 3 5% 4 22%	1985
	21st to end	Day	10% 14% 4 13% 8% 6% 5% 3 5% 5% 26%	1730
March	1st to 10th	Day	18% 18% 5% 11% 6% 5% 4 3 4 4 23%	4576
	11th to 20th	Day	13% 18% 3 9% 5% 5% 5% 3 5% 6% 27%	4967
	21st to end	Day	18% 15% 6% 9% 5% 4 3 3 4 5% 28%	5773
April	1st to 10th	Day	21% 16% 4 9% 6% 4 4 2 4 5% 26%	2520
	11th to 20th	Day	18% 12% 4 8% 5% 4 4 4 5% 5% 33%	2639
	21st to end	Day	22% 13% 3 7% 4 4 3 3 4 6% 30%	2730
May	1st to 10th	Day	24% 11% 3 8% 6% 5% 5% 3 5% 6% 24%	6016
	11th to 20th	Day	23% 9% 3 8% 5% 5% 5% 4 5% 6% 26%	6402
	21st to end	Day	19% 9% 3 8% 6% 5% 5% 4 6% 7% 28%	7377
June	1st to 10th	Day	21% 9% 3 7% 6% 5% 5% 4 6% 8% 26%	3000
	11th to 20th	Day	19% 7% 2 7% 5% 5% 5% 4 7% 8% 30%	3000
	21st to end	Day	22% 11% 4 8% 5% 5% 5% 4 6% 5% 24%	3000
July	1st to 10th	Day	17% 7% 3 9% 6% 7% 6% 5% 7% 8% 25%	6642
	11th to 20th	Day	14% 6% 2 7% 5% 6% 6% 5% 7% 9% 32%	6360
	21st to end	Day	13% 6% 2 6% 4 5% 5% 4 7% 8% 40%	6926
August	1st to 10th	Day	16% 6% 3 8% 5% 6% 6% 5% 8% 9% 29%	4417
	11th to 20th	Day	17% 8% 3 9% 6% 5% 6% 5% 7% 7% 26%	4175
	21st to end	Day	18% 7% 3 7% 5% 4 5% 3 6% 8% 35%	4577
September	1st to 10th	Day	15% 8% 3 7% 4 5% 4 4 6% 7% 37%	2375
	11th to 20th	Day	16% 7% 3 5% 4 4 4 2 5% 6% 44%	2200
	21st to end	Day	17% 8% 3 6% 4 4 4 4 5% 8% 37%	2200
October	1st to 10th	Day	18% 9% 2 7% 5% 4 4 3 5% 7% 34%	2186
	11th to 20th	Day	18% 12% 4 10% 4 5% 4 4 5% 6% 26%	1866
	21st to end	Day	22% 16% 4 11% 5% 4 4 3 4 5% 23%	1980
November	1st to 10th	Day	17% 15% 4 9% 6% 5% 4 3 5% 5% 27%	1851
	11th to 20th	Day	16% 14% 5% 11% 7% 4 5% 5% 4 5% 24%	1849
	21st to end	Day	16% 18% 5% 11% 7% 4 4 4 6% 6% 19%	1559
December	1st to 10th	Day	15% 15% 6% 14% 7% 6% 5% 3 4 5% 20%	2350
	11th to 20th	Day	16% 15% 6% 10% 7% 4 5% 3 4 5% 26%	2688
	21st to end	Day	16% 16% 5% 12% 6% 4 5% 3 5% 5% 23%	3553
January	1st to 10th	Night	10% 16% 7% 14% 8% 7% 6% 4 5% 5% 18%	8252
	11th to 20th	Night	8% 17% 8% 18% 10% 8% 5% 3 4 4 14%	8235
	21st to end	Night	4 9% 7% 14% 7% 7% 7% 5% 8% 8% 24%	9057
February	1st to 10th	Night	7% 14% 5% 12% 9% 8% 5% 4 5% 6% 26%	2866
	11th to 20th	Night	8% 14% 5% 13% 9% 6% 6% 4 6% 5% 23%	2520
	21st to end	Night	11% 14% 3 9% 7% 5% 5% 3 5% 6% 31%	2076
March	1st to 10th	Night	18% 15% 5% 11% 5% 4 5% 3 4 5% 25%	5484
	11th to 20th	Night	12% 12% 4 11% 7% 7% 6% 4 5% 6% 24%	5212
	21st to end	Night	17% 14% 4 10% 6% 5% 4 3 4 4 29%	5384
April	1st to 10th	Night	18% 14% 4 9% 4 4 4 4 5% 5% 29%	2100
	11th to 20th	Night	16% 13% 3 8% 4 5% 4 4 5% 6% 32%	1928
	21st to end	Night	20% 11% 4 7% 5% 4 4 3 4 5% 32%	1890
May	1st to 10th	Night	23% 10% 3 7% 5% 4 5% 4 6% 7% 27%	4144
	11th to 20th	Night	23% 7% 3 6% 5% 5% 4 3 5% 5% 34%	3754
	21st to end	Night	19% 6% 2 6% 5% 4 4 4 6% 7% 37%	3750
June	1st to 10th	Night	21% 10% 2 7% 5% 5% 6% 4 6% 7% 28%	1400
	11th to 20th	Night	16% 6% 3 6% 5% 5% 4 4 6% 8% 37%	1400
	21st to end	Night	20% 7% 3 8% 5% 5% 5% 4 6% 7% 31%	1400
July	1st to 10th	Night	15% 6% 3 8% 6% 5% 6% 5% 6% 8% 33%	3326
	11th to 20th	Night	18% 6% 2 6% 4 5% 5% 4 5% 7% 38%	3600
	21st to end	Night	11% 5% 3 6% 5% 5% 4 5% 7% 8% 41%	3926
August	1st to 10th	Night	18% 7% 3 7% 5% 5% 5% 4 5% 8% 35%	2699
	11th to 20th	Night	14% 6% 3 9% 6% 5% 6% 5% 6% 7% 33%	2872
	21st to end	Night	15% 6% 3 6% 4 4 5% 3 6% 7% 41%	3317
September	1st to 10th	Night	14% 6% 2 7% 4 5% 5% 3 5% 8% 43%	2025
	11th to 20th	Night	15% 7% 2 5% 4 4 4 4 5% 6% 46%	2200
	21st to end	Night	16% 7% 3 5% 5% 5% 5% 4 6% 6% 40%	2200
October	1st to 10th	Night	16% 7% 2 6% 4 3 4 3 6% 7% 41%	2213
	11th to 20th	Night	20% 10% 3 6% 5% 4 5% 4 4 6% 32%	2530
	21st to end	Night	19% 12% 4 8% 4 5% 5% 4 5% 5% 29%	2860
November	1st to 10th	Night	16% 12% 4 7% 6% 5% 5% 5% 6% 7% 27%	2667
	11th to 20th	Night	15% 10% 4 11% 6% 5% 4 4 6% 6% 29%	2768
	21st to end	Night	16% 15% 5% 11% 7% 5% 4 4 5% 6% 23%	3056
December	1st to 10th	Night	12% 12% 6% 13% 10% 9% 6% 4 5% 6% 18%	5060
	11th to 20th	Night	18% 16% 4 12% 8% 5% 4 3 4 4 22%	5741
	21st to end	Night	16% 17% 5% 10% 6% 4 4 3 4 4 27%	7667

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	65% 7% 7% 14% 6%	4640
	11th to 20th	Day	76% 5% 4 9% 5% 1	4680
	21st to end	Day	59% 8% 6% 14% 13% 1	5124
February	1st to 10th	Day	67% 5% 6% 13% 7% 2	1754
	11th to 20th	Day	67% 5% 8% 12% 7% 1	1994
	21st to end	Day	60% 6% 8% 17% 7% 2	1730
March	1st to 10th	Day	65% 5% 6% 10% 10% 4	4579
	11th to 20th	Day	57% 8% 15% 13% 7% 1	4967
	21st to end	Day	61% 4 6% 15% 12% 3	5773
April	1st to 10th	Day	62% 5% 8% 14% 9% 2	2520
	11th to 20th	Day	54% 5% 9% 19% 11% 2	2639
	21st to end	Day	57% 5% 8% 17% 10% 3	2730
May	1st to 10th	Day	61% 7% 8% 16% 8% 1	6027
	11th to 20th	Day	56% 9% 12% 15% 5% 2	6406
	21st to end	Day	52% 10% 11% 17% 9% 2	7377
June	1st to 10th	Day	56% 7% 11% 18% 7% 1	3000
	11th to 20th	Day	49% 9% 12% 19% 9% 1	3000
	21st to end	Day	60% 8% 9% 15% 7%	3000
July	1st to 10th	Day	55% 8% 14% 17% 6%	6570
	11th to 20th	Day	45% 9% 16% 26% 4	6285
	21st to end	Day	41% 8% 16% 28% 7%	6728
August	1st to 10th	Day	50% 10% 16% 19% 5%	4403
	11th to 20th	Day	53% 11% 16% 16% 4	4214
	21st to end	Day	47% 7% 15% 19% 11% 1	4577
September	1st to 10th	Day	44% 8% 15% 22% 10% 1	2375
	11th to 20th	Day	42% 6% 11% 29% 12% 1	2200
	21st to end	Day	45% 8% 12% 23% 11%	2200
October	1st to 10th	Day	53% 6% 11% 22% 7%	3563
	11th to 20th	Day	55% 6% 12% 23% 4	3017
	21st to end	Day	51% 6% 15% 19% 9%	3180
November	1st to 10th	Day	59% 7% 11% 16% 7%	1851
	11th to 20th	Day	63% 6% 10% 13% 7% 1	1849
	21st to end	Day	66% 8% 9% 13% 4	1559
December	1st to 10th	Day	70% 6% 7% 10% 7%	2350
	11th to 20th	Day	62% 6% 9% 13% 10%	2688
	21st to end	Day	65% 6% 7% 10% 11% 2	3553
January	1st to 10th	Night	70% 8% 8% 9% 5%	8252
	11th to 20th	Night	75% 7% 6% 9% 3 1	8280
	21st to end	Night	58% 8% 8% 14% 12% 1	9057
February	1st to 10th	Night	62% 5% 9% 14% 8% 1	2866
	11th to 20th	Night	65% 6% 8% 13% 7% 1	2522
	21st to end	Night	56% 6% 9% 17% 11% 2	2076
March	1st to 10th	Night	63% 6% 7% 12% 10% 1	5494
	11th to 20th	Night	59% 9% 14% 10% 7% 1	5213
	21st to end	Night	60% 4 5% 17% 13% 1	5384
April	1st to 10th	Night	58% 5% 7% 15% 12% 3	2100
	11th to 20th	Night	54% 5% 9% 19% 11% 1	1928
	21st to end	Night	55% 7% 9% 17% 10% 2	1890
May	1st to 10th	Night	56% 7% 11% 17% 8% 1	4150
	11th to 20th	Night	51% 9% 12% 20% 7%	3755
	21st to end	Night	45% 9% 16% 17% 12% 1	3751
June	1st to 10th	Night	55% 8% 12% 18% 7%	1400
	11th to 20th	Night	45% 8% 13% 22% 11% 1	1400
	21st to end	Night	53% 10% 13% 16% 8%	1400
July	1st to 10th	Night	48% 8% 18% 19% 5%	3288
	11th to 20th	Night	46% 7% 20% 23% 4	3552
	21st to end	Night	41% 10% 18% 25% 7%	3809
August	1st to 10th	Night	49% 7% 17% 23% 4	2689
	11th to 20th	Night	48% 11% 18% 16% 6% 1	2899
	21st to end	Night	42% 8% 15% 21% 13%	3317
September	1st to 10th	Night	40% 7% 15% 28% 9% 1	2025
	11th to 20th	Night	40% 6% 17% 27% 10%	2200
	21st to end	Night	45% 7% 12% 22% 13%	2200
October	1st to 10th	Night	45% 6% 12% 26% 9%	3616
	11th to 20th	Night	54% 5% 11% 24% 5%	4118
	21st to end	Night	49% 6% 16% 19% 9%	4610
November	1st to 10th	Night	57% 9% 12% 16% 5%	2667
	11th to 20th	Night	57% 8% 10% 15% 9% 1	2768
	21st to end	Night	65% 7% 12% 12% 4	3056
December	1st to 10th	Night	72% 7% 9% 9% 2	5060
	11th to 20th	Night	67% 5% 8% 15% 5%	5742
	21st to end	Night	64% 5% 7% 13% 10% 1	7667

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% 36% 29% 6% 1	220
	11th to 20th	Day	31% 25% 32% 10% 1	220
	21st to end	Day	21% 27% 36% 12% 3	242
February	1st to 10th	Day	28% 24% 34% 9% 4	294
	11th to 20th	Day	26% 28% 35% 9% 2	503
	21st to end	Day	25% 28% 34% 10% 3	446
March	1st to 10th	Day	29% 29% 28% 11% 3	540
	11th to 20th	Day	27% 28% 29% 11% 5%	540
	21st to end	Day	34% 23% 24% 14% 4 1	594
April	1st to 10th	Day	37% 21% 26% 12% 4	540
	11th to 20th	Day	34% 24% 26% 12% 4 1	532
	21st to end	Day	34% 18% 31% 11% 4 2	540
May	1st to 10th	Day	34% 17% 33% 12% 3 1	543
	11th to 20th	Day	28% 19% 29% 18% 5% 1	567
	21st to end	Day	23% 23% 34% 15% 5%	735
June	1st to 10th	Day	26% 18% 33% 16% 6% 1	730
	11th to 20th	Day	23% 17% 28% 24% 8% 1	730
	21st to end	Day	28% 15% 29% 19% 7% 1	730
July	1st to 10th	Day	20% 15% 38% 18% 8% 1	649
	11th to 20th	Day	19% 15% 40% 18% 7% 1	524
	21st to end	Day	18% 14% 37% 24% 6% 1	576
August	1st to 10th	Day	18% 14% 33% 25% 7% 2	526
	11th to 20th	Day	18% 12% 30% 26% 11% 3	519
	21st to end	Day	22% 16% 30% 20% 9% 4	583
September	1st to 10th	Day	19% 17% 30% 22% 10% 3	530
	11th to 20th	Day	23% 11% 30% 21% 11% 4	530
	21st to end	Day	22% 15% 29% 18% 11% 4	530
October	1st to 10th	Day	22% 20% 25% 20% 10% 3	522
	11th to 20th	Day	31% 20% 26% 12% 10% 1	420
	21st to end	Day	34% 22% 28% 12% 3	462
November	1st to 10th	Day	35% 18% 30% 13% 3	425
	11th to 20th	Day	27% 24% 28% 15% 6% 1	430
	21st to end	Day	32% 28% 25% 11% 2 1	309
December	1st to 10th	Day	33% 19% 33% 11% 3	220
	11th to 20th	Day	34% 29% 29% 6% 2	220
	21st to end	Day	34% 26% 22% 14% 3	242
January	1st to 10th	Night	26% 26% 35% 12% 1	843
	11th to 20th	Night	25% 25% 34% 13% 2	840
	21st to end	Night	18% 24% 38% 18% 3	924
February	1st to 10th	Night	19% 27% 35% 15% 4	840
	11th to 20th	Night	24% 24% 36% 13% 2	823
	21st to end	Night	23% 19% 39% 15% 3	692
March	1st to 10th	Night	26% 19% 37% 16% 2	840
	11th to 20th	Night	25% 23% 33% 15% 4 1	840
	21st to end	Night	24% 20% 30% 21% 5%	924
April	1st to 10th	Night	32% 17% 31% 16% 4	840
	11th to 20th	Night	27% 18% 30% 20% 5%	684
	21st to end	Night	32% 14% 28% 19% 7%	630
May	1st to 10th	Night	26% 13% 33% 22% 6%	630
	11th to 20th	Night	25% 10% 32% 26% 7% 1	461
	21st to end	Night	23% 12% 31% 27% 7%	455
June	1st to 10th	Night	28% 8% 32% 25% 7% 1	400
	11th to 20th	Night	18% 11% 30% 32% 9% 1	400
	21st to end	Night	22% 9% 34% 28% 7% 1	400
July	1st to 10th	Night	16% 9% 35% 28% 11% 1	390
	11th to 20th	Night	16% 6% 32% 36% 9%	388
	21st to end	Night	18% 7% 32% 34% 9%	438
August	1st to 10th	Night	17% 5% 29% 36% 14% 1	459
	11th to 20th	Night	15% 8% 29% 33% 14% 1	592
	21st to end	Night	15% 7% 32% 33% 12% 2	715
September	1st to 10th	Night	16% 10% 33% 29% 11% 1	800
	11th to 20th	Night	19% 10% 29% 28% 14% 2	800
	21st to end	Night	21% 12% 30% 23% 14% 1	800
October	1st to 10th	Night	23% 14% 29% 26% 9% 1	800
	11th to 20th	Night	27% 14% 31% 20% 8% 1	800
	21st to end	Night	31% 19% 30% 16% 4	880
November	1st to 10th	Night	30% 19% 28% 18% 4	820
	11th to 20th	Night	26% 21% 30% 15% 8%	860
	21st to end	Night	26% 24% 30% 15% 4 1	950
December	1st to 10th	Night	29% 20% 34% 13% 4	950
	11th to 20th	Night	29% 26% 26% 14% 5%	950
	21st to end	Night	29% 25% 29% 14% 3	1045

Page generated at 2026-05-29 01:53:26. Version ac07

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