Ste-Agathe-des-Monts
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ste-Agathe-des-Monts 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	16% 11% 4 9% 5% 5% 5% 4 5% 6% 29%	101566
	Night	16% 12% 4 10% 5% 5% 4 3 5% 6% 30%	97454
Transparency	Day	54% 5% 12% 20% 9% 1	105016
	Night	54% 5% 12% 19% 9% 1	102093
Seeing	Day	25% 19% 30% 17% 6% 2	14499
	Night	23% 17% 29% 23% 8% 1	23459

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% 17% 7% 17% 6% 5% 5% 4 4 4 18%	2517
	11th to 20th	Day	11% 14% 7% 19% 11% 5% 3 2 2 4 20%	2520
	21st to end	Day	10% 16% 9% 14% 6% 5% 6% 5% 5% 5% 20%	2772
February	1st to 10th	Day	10% 19% 5% 12% 9% 5% 4 4 4 6% 22%	1679
	11th to 20th	Day	11% 18% 6% 12% 7% 5% 4 3 5% 5% 25%	1724
	21st to end	Day	14% 19% 6% 9% 7% 4 4 4 4 4 24%	1570
March	1st to 10th	Day	16% 17% 5% 12% 7% 5% 4 3 4 4 24%	3116
	11th to 20th	Day	12% 18% 6% 13% 6% 5% 4 3 4 4 24%	3336
	21st to end	Day	13% 11% 3 8% 5% 4 5% 4 5% 7% 36%	4129
April	1st to 10th	Day	19% 15% 4 9% 5% 3 3 3 4 6% 29%	2280
	11th to 20th	Day	21% 10% 3 8% 4 4 4 3 5% 5% 32%	2254
	21st to end	Day	21% 12% 4 9% 4 4 4 3 5% 5% 29%	2431
May	1st to 10th	Day	20% 11% 3 8% 5% 4 5% 4 5% 6% 28%	4426
	11th to 20th	Day	18% 8% 3 7% 6% 5% 5% 5% 6% 8% 29%	4398
	21st to end	Day	17% 8% 3 7% 5% 5% 5% 4 5% 8% 33%	4837
June	1st to 10th	Day	22% 9% 3 7% 5% 5% 5% 4 7% 7% 26%	2660
	11th to 20th	Day	16% 8% 3 8% 6% 5% 5% 4 6% 8% 31%	2660
	21st to end	Day	22% 10% 3 7% 5% 5% 6% 5% 5% 6% 26%	2660
July	1st to 10th	Day	13% 7% 3 8% 6% 6% 7% 5% 7% 8% 31%	4440
	11th to 20th	Day	15% 6% 2 6% 5% 5% 6% 5% 7% 8% 34%	4440
	21st to end	Day	12% 6% 2 7% 4 5% 5% 4 6% 7% 43%	4814
August	1st to 10th	Day	15% 7% 3 8% 5% 6% 6% 5% 7% 8% 30%	4423
	11th to 20th	Day	16% 7% 3 7% 5% 4 5% 4 7% 8% 33%	4028
	21st to end	Day	16% 6% 3 6% 5% 5% 5% 4 6% 8% 36%	4180
September	1st to 10th	Day	15% 7% 2 7% 4 4 4 4 6% 7% 40%	2280
	11th to 20th	Day	15% 6% 3 6% 4 5% 4 3 6% 7% 43%	2223
	21st to end	Day	19% 9% 2 6% 4 4 3 3 5% 6% 38%	2090
October	1st to 10th	Day	22% 9% 3 6% 4 4 4 3 6% 6% 32%	1924
	11th to 20th	Day	22% 12% 3 8% 6% 5% 4 4 5% 5% 26%	1875
	21st to end	Day	24% 12% 4 9% 5% 4 5% 2 5% 5% 25%	1881
November	1st to 10th	Day	15% 13% 4 8% 5% 5% 5% 3 5% 6% 32%	1698
	11th to 20th	Day	19% 15% 5% 10% 7% 4 4 4 5% 5% 23%	1583
	21st to end	Day	20% 16% 6% 9% 6% 4 5% 4 5% 4 21%	1520
December	1st to 10th	Day	20% 21% 5% 12% 5% 4 4 3 4 4 18%	1520
	11th to 20th	Day	18% 17% 6% 12% 5% 4 4 3 5% 5% 21%	1906
	21st to end	Day	20% 20% 6% 11% 5% 3 4 3 4 5% 19%	2772
January	1st to 10th	Night	13% 19% 7% 13% 6% 4 4 4 5% 4 20%	4429
	11th to 20th	Night	10% 13% 6% 16% 11% 7% 5% 3 4 5% 21%	4440
	21st to end	Night	10% 14% 8% 17% 8% 6% 4 3 4 6% 19%	4884
February	1st to 10th	Night	11% 15% 5% 12% 8% 5% 4 4 5% 6% 24%	2499
	11th to 20th	Night	10% 14% 6% 13% 7% 5% 5% 4 5% 5% 26%	2341
	21st to end	Night	12% 15% 6% 11% 4 5% 6% 3 6% 6% 26%	1884
March	1st to 10th	Night	17% 14% 5% 10% 5% 4 5% 3 4 5% 30%	3724
	11th to 20th	Night	12% 19% 7% 11% 5% 5% 4 3 4 5% 26%	3621
	21st to end	Night	12% 11% 4 10% 6% 5% 5% 3 4 5% 35%	3503
April	1st to 10th	Night	21% 12% 4 8% 5% 4 3 3 4 7% 30%	1900
	11th to 20th	Night	18% 9% 3 6% 5% 4 4 4 6% 5% 35%	1875
	21st to end	Night	20% 10% 3 8% 4 4 5% 3 5% 5% 34%	1760
May	1st to 10th	Night	18% 11% 4 8% 4 5% 4 4 5% 6% 30%	2517
	11th to 20th	Night	20% 7% 3 7% 4 4 3 3 5% 6% 37%	2495
	21st to end	Night	17% 8% 3 7% 5% 5% 5% 4 6% 7% 33%	2738
June	1st to 10th	Night	19% 9% 2 7% 5% 4 5% 4 7% 8% 31%	1520
	11th to 20th	Night	18% 7% 2 7% 5% 4 4 4 5% 8% 37%	1520
	21st to end	Night	21% 6% 3 6% 4 5% 5% 4 5% 6% 35%	1520
July	1st to 10th	Night	13% 8% 2 8% 6% 5% 6% 5% 5% 7% 35%	2520
	11th to 20th	Night	15% 6% 2 7% 4 3 5% 4 5% 7% 41%	2520
	21st to end	Night	11% 6% 2 5% 4 5% 4 4 6% 8% 47%	2739
August	1st to 10th	Night	12% 6% 3 8% 5% 4 4 4 6% 8% 39%	2506
	11th to 20th	Night	15% 8% 3 7% 4 4 4 3 5% 6% 41%	2766
	21st to end	Night	18% 5% 2 6% 4 4 4 3 5% 7% 42%	3476
September	1st to 10th	Night	12% 8% 3 6% 3 4 4 4 6% 6% 46%	1900
	11th to 20th	Night	15% 5% 2 5% 3 3 3 4 5% 7% 48%	1957
	21st to end	Night	18% 6% 2 5% 4 3 3 4 5% 7% 43%	2090
October	1st to 10th	Night	16% 9% 3 7% 5% 5% 4 3 4 6% 37%	2251
	11th to 20th	Night	20% 11% 3 8% 4 5% 4 4 4 6% 32%	2304
	21st to end	Night	23% 10% 3 8% 5% 4 4 3 5% 7% 27%	2717
November	1st to 10th	Night	17% 10% 5% 9% 5% 5% 5% 3 6% 6% 29%	2453
	11th to 20th	Night	16% 13% 4 10% 6% 5% 4 4 5% 7% 26%	2593
	21st to end	Night	18% 17% 5% 11% 6% 4 4 4 4 5% 23%	2660
December	1st to 10th	Night	17% 17% 7% 12% 8% 4 4 4 5% 5% 16%	2660
	11th to 20th	Night	19% 16% 6% 12% 6% 5% 3 3 3 4 23%	3288
	21st to end	Night	21% 22% 6% 10% 5% 4 3 2 4 4 19%	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	69% 7% 7% 12% 5%	2518
	11th to 20th	Day	70% 4 5% 14% 7% 1	2520
	21st to end	Day	65% 6% 9% 12% 7% 1	2772
February	1st to 10th	Day	64% 3 7% 17% 8% 2	1679
	11th to 20th	Day	63% 4 8% 14% 10% 1	1733
	21st to end	Day	64% 3 8% 14% 9% 3	1570
March	1st to 10th	Day	63% 4 8% 13% 11% 1	3119
	11th to 20th	Day	63% 5% 9% 12% 10% 2	3336
	21st to end	Day	48% 4 7% 20% 17% 2	4129
April	1st to 10th	Day	57% 4 8% 17% 11% 3	2280
	11th to 20th	Day	54% 5% 8% 20% 12% 2	2254
	21st to end	Day	57% 5% 7% 16% 12% 3	2431
May	1st to 10th	Day	55% 6% 8% 21% 8% 1	4440
	11th to 20th	Day	50% 7% 16% 17% 8% 1	4402
	21st to end	Day	50% 4 11% 20% 14% 1	4837
June	1st to 10th	Day	56% 6% 10% 18% 10% 1	2660
	11th to 20th	Day	49% 6% 13% 19% 11% 3	2660
	21st to end	Day	58% 6% 10% 17% 8%	2660
July	1st to 10th	Day	49% 5% 14% 23% 8%	4370
	11th to 20th	Day	45% 6% 17% 26% 6%	4365
	21st to end	Day	40% 5% 15% 31% 9%	4661
August	1st to 10th	Day	50% 6% 16% 22% 6%	4409
	11th to 20th	Day	45% 7% 17% 26% 5%	4070
	21st to end	Day	45% 5% 15% 21% 13% 1	4180
September	1st to 10th	Day	44% 5% 13% 26% 12%	2280
	11th to 20th	Day	40% 6% 13% 29% 11% 1	2223
	21st to end	Day	47% 4 13% 25% 11%	2090
October	1st to 10th	Day	48% 4 13% 27% 8%	3197
	11th to 20th	Day	50% 5% 13% 23% 7%	3091
	21st to end	Day	52% 4 20% 15% 9% 1	3081
November	1st to 10th	Day	53% 5% 14% 20% 8% 1	1698
	11th to 20th	Day	62% 6% 11% 12% 9% 1	1583
	21st to end	Day	65% 7% 10% 13% 4 1	1520
December	1st to 10th	Day	70% 5% 8% 11% 5%	1520
	11th to 20th	Day	66% 6% 9% 13% 6%	1906
	21st to end	Day	68% 6% 6% 13% 7%	2772
January	1st to 10th	Night	65% 6% 12% 12% 4	4429
	11th to 20th	Night	64% 6% 11% 13% 5% 1	4440
	21st to end	Night	67% 5% 9% 10% 7% 1	4884
February	1st to 10th	Night	61% 5% 8% 18% 7% 1	2499
	11th to 20th	Night	59% 6% 9% 17% 9% 1	2343
	21st to end	Night	57% 4 9% 16% 11% 2	1884
March	1st to 10th	Night	57% 4 10% 13% 12% 3	3734
	11th to 20th	Night	61% 5% 7% 14% 11% 1	3622
	21st to end	Night	52% 4 7% 20% 14% 4	3503
April	1st to 10th	Night	55% 3 7% 19% 13% 2	1900
	11th to 20th	Night	49% 5% 9% 21% 14% 2	1875
	21st to end	Night	52% 5% 8% 19% 13% 3	1760
May	1st to 10th	Night	53% 5% 13% 19% 8% 2	2523
	11th to 20th	Night	45% 7% 16% 18% 12% 2	2496
	21st to end	Night	50% 5% 10% 20% 14% 2	2739
June	1st to 10th	Night	49% 7% 12% 21% 11%	1520
	11th to 20th	Night	46% 5% 11% 22% 13% 3	1520
	21st to end	Night	49% 7% 12% 20% 12% 1	1520
July	1st to 10th	Night	48% 5% 17% 20% 9%	2480
	11th to 20th	Night	42% 5% 19% 28% 5%	2472
	21st to end	Night	35% 6% 20% 27% 12%	2651
August	1st to 10th	Night	42% 7% 16% 28% 7%	2496
	11th to 20th	Night	44% 5% 19% 25% 7%	2790
	21st to end	Night	43% 4 16% 24% 11% 2	3476
September	1st to 10th	Night	38% 6% 14% 28% 13% 1	1900
	11th to 20th	Night	35% 6% 16% 32% 11% 1	1957
	21st to end	Night	41% 6% 13% 28% 12%	2090
October	1st to 10th	Night	46% 4 13% 24% 11% 1	3758
	11th to 20th	Night	47% 5% 13% 25% 9%	3827
	21st to end	Night	50% 5% 18% 16% 10% 1	4467
November	1st to 10th	Night	54% 6% 13% 19% 7% 1	2453
	11th to 20th	Night	58% 6% 10% 17% 7% 2	2593
	21st to end	Night	63% 6% 9% 14% 6% 1	2660
December	1st to 10th	Night	70% 6% 8% 11% 4	2660
	11th to 20th	Night	66% 5% 7% 15% 7% 1	3288
	21st to end	Night	69% 4 6% 13% 6%	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	21% 25% 38% 13% 3	180
	11th to 20th	Day	28% 22% 33% 12% 5% 1	180
	21st to end	Day	22% 23% 35% 15% 5% 1	198
February	1st to 10th	Day	36% 29% 29% 6% 2	256
	11th to 20th	Day	26% 32% 36% 6% 1	331
	21st to end	Day	31% 25% 32% 12% 1	382
March	1st to 10th	Day	26% 23% 34% 14% 3	460
	11th to 20th	Day	27% 26% 30% 13% 3 1	460
	21st to end	Day	31% 24% 25% 14% 5% 1	506
April	1st to 10th	Day	32% 20% 30% 13% 3 1	460
	11th to 20th	Day	35% 21% 24% 12% 8% 1	452
	21st to end	Day	32% 20% 32% 12% 4 1	460
May	1st to 10th	Day	27% 24% 30% 15% 4 1	463
	11th to 20th	Day	23% 20% 32% 18% 6% 1	487
	21st to end	Day	25% 19% 32% 19% 4	529
June	1st to 10th	Day	27% 16% 34% 16% 6%	490
	11th to 20th	Day	18% 23% 31% 17% 10% 1	490
	21st to end	Day	29% 15% 31% 18% 6% 1	490
July	1st to 10th	Day	17% 12% 36% 25% 8% 2	485
	11th to 20th	Day	17% 14% 36% 27% 6% 1	484
	21st to end	Day	14% 13% 36% 27% 7% 2	532
August	1st to 10th	Day	18% 11% 29% 29% 11% 2	486
	11th to 20th	Day	16% 9% 30% 27% 13% 5%	479
	21st to end	Day	16% 19% 28% 21% 10% 6%	539
September	1st to 10th	Day	20% 14% 30% 22% 10% 4	490
	11th to 20th	Day	14% 14% 27% 22% 14% 8%	490
	21st to end	Day	23% 16% 23% 22% 11% 5%	490
October	1st to 10th	Day	28% 18% 24% 18% 10% 2	490
	11th to 20th	Day	30% 22% 26% 16% 6% 1	476
	21st to end	Day	35% 15% 30% 16% 4	429
November	1st to 10th	Day	32% 19% 28% 17% 3 1	374
	11th to 20th	Day	27% 28% 28% 12% 5%	243
	21st to end	Day	31% 26% 31% 11% 2	180
December	1st to 10th	Day	32% 22% 28% 12% 6%	180
	11th to 20th	Day	31% 28% 31% 8% 2 1	180
	21st to end	Day	35% 26% 24% 10% 4 1	198
January	1st to 10th	Night	24% 22% 35% 16% 4	760
	11th to 20th	Night	25% 25% 28% 17% 5%	760
	21st to end	Night	16% 20% 38% 20% 6% 1	836
February	1st to 10th	Night	19% 24% 33% 19% 3 1	760
	11th to 20th	Night	21% 24% 36% 15% 3	743
	21st to end	Night	23% 20% 33% 21% 3	628
March	1st to 10th	Night	24% 21% 33% 19% 3	760
	11th to 20th	Night	24% 25% 28% 18% 4 1	760
	21st to end	Night	23% 20% 29% 22% 5% 1	836
April	1st to 10th	Night	27% 20% 27% 22% 4	760
	11th to 20th	Night	24% 20% 29% 22% 5% 1	751
	21st to end	Night	26% 18% 29% 19% 7%	620
May	1st to 10th	Night	25% 11% 33% 23% 6% 2	383
	11th to 20th	Night	21% 13% 30% 28% 8% 1	374
	21st to end	Night	20% 11% 38% 24% 7%	411
June	1st to 10th	Night	23% 9% 30% 29% 8%	380
	11th to 20th	Night	22% 8% 24% 32% 13% 1	380
	21st to end	Night	22% 6% 25% 33% 13% 1	380
July	1st to 10th	Night	14% 8% 28% 36% 14% 1	370
	11th to 20th	Night	13% 8% 24% 39% 15% 1	368
	21st to end	Night	13% 7% 25% 40% 14% 1	416
August	1st to 10th	Night	13% 7% 20% 43% 15% 1	378
	11th to 20th	Night	14% 6% 23% 32% 24% 1	542
	21st to end	Night	17% 8% 26% 31% 15% 2	836
September	1st to 10th	Night	16% 9% 30% 31% 13% 1	760
	11th to 20th	Night	17% 10% 22% 31% 20% 2	760
	21st to end	Night	21% 12% 24% 25% 16% 2	760
October	1st to 10th	Night	23% 13% 27% 24% 13% 1	760
	11th to 20th	Night	27% 14% 29% 22% 7% 1	760
	21st to end	Night	29% 17% 27% 23% 5%	836
November	1st to 10th	Night	26% 19% 26% 22% 5% 1	755
	11th to 20th	Night	25% 21% 28% 16% 8% 1	760
	21st to end	Night	29% 24% 24% 17% 5% 1	760
December	1st to 10th	Night	30% 21% 27% 16% 6%	760
	11th to 20th	Night	28% 24% 26% 16% 4 1	760
	21st to end	Night	33% 22% 27% 15% 3	836

Page generated at 2024-11-01 22:47:44. Version ac07

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