Radar de Saint-Adolphe-d'Howard
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Radar de Saint-Adolphe-d'Howard clear sky chart from 2005-11-06 to 2024-11-25.

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% 5% 5% 5% 4 5% 6% 30%	101743
	Night	16% 12% 4 9% 5% 4 4 3 5% 6% 31%	97737
Transparency	Day	51% 8% 12% 19% 9% 1	105193
	Night	51% 8% 12% 19% 9% 1	102376
Seeing	Day	25% 19% 30% 18% 6% 2	14559
	Night	22% 16% 30% 23% 8% 1	23554

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% 16% 7% 5% 4 3 3 4 19%	2517
	11th to 20th	Day	12% 15% 7% 17% 11% 4 4 2 3 5% 20%	2520
	21st to end	Day	10% 17% 8% 14% 5% 5% 5% 5% 5% 5% 20%	2772
February	1st to 10th	Day	11% 19% 5% 12% 8% 4 4 3 4 6% 23%	1685
	11th to 20th	Day	12% 19% 5% 11% 6% 6% 4 4 4 5% 25%	1725
	21st to end	Day	15% 18% 5% 10% 6% 5% 5% 3 4 5% 24%	1570
March	1st to 10th	Day	17% 16% 6% 11% 6% 4 4 3 4 5% 24%	3116
	11th to 20th	Day	12% 19% 5% 13% 5% 4 4 3 5% 5% 25%	3338
	21st to end	Day	13% 11% 3 8% 5% 5% 4 4 5% 6% 37%	4128
April	1st to 10th	Day	20% 14% 4 8% 5% 3 3 3 4 5% 31%	2280
	11th to 20th	Day	21% 11% 3 7% 4 4 4 3 4 5% 33%	2254
	21st to end	Day	22% 11% 4 8% 5% 4 5% 3 4 5% 30%	2426
May	1st to 10th	Day	21% 10% 4 9% 5% 5% 4 3 6% 6% 28%	4426
	11th to 20th	Day	19% 8% 3 8% 5% 5% 4 4 6% 7% 30%	4398
	21st to end	Day	18% 7% 3 7% 5% 5% 5% 4 6% 7% 34%	4837
June	1st to 10th	Day	22% 9% 3 7% 4 4 5% 5% 6% 7% 27%	2660
	11th to 20th	Day	16% 8% 3 8% 5% 5% 5% 5% 6% 7% 33%	2660
	21st to end	Day	23% 9% 3 7% 5% 5% 4 5% 5% 6% 26%	2660
July	1st to 10th	Day	13% 6% 2 9% 7% 6% 6% 5% 7% 8% 32%	4440
	11th to 20th	Day	15% 6% 2 7% 5% 5% 6% 5% 7% 8% 34%	4440
	21st to end	Day	12% 6% 2 6% 5% 5% 4 4 6% 7% 43%	4814
August	1st to 10th	Day	15% 6% 3 8% 6% 5% 6% 5% 6% 8% 31%	4423
	11th to 20th	Day	16% 7% 3 7% 5% 4 5% 4 7% 8% 34%	4019
	21st to end	Day	16% 5% 3 7% 5% 5% 5% 4 6% 8% 37%	4180
September	1st to 10th	Day	16% 6% 2 6% 4 4 5% 4 5% 8% 40%	2280
	11th to 20th	Day	14% 6% 3 6% 4 4 4 3 4 7% 45%	2223
	21st to end	Day	20% 7% 3 5% 4 3 4 3 5% 6% 40%	2090
October	1st to 10th	Day	22% 8% 2 6% 5% 4 4 4 5% 6% 33%	1924
	11th to 20th	Day	23% 11% 3 9% 5% 4 4 4 5% 6% 27%	1876
	21st to end	Day	25% 12% 3 9% 5% 4 3 3 5% 6% 26%	1881
November	1st to 10th	Day	15% 12% 4 8% 5% 4 5% 4 5% 6% 32%	1761
	11th to 20th	Day	19% 14% 5% 9% 5% 4 4 3 6% 4 26%	1670
	21st to end	Day	21% 15% 5% 9% 6% 4 4 4 5% 5% 21%	1552
December	1st to 10th	Day	21% 21% 5% 10% 5% 4 4 3 3 4 19%	1520
	11th to 20th	Day	19% 16% 6% 12% 5% 4 4 3 5% 4 22%	1906
	21st to end	Day	21% 20% 7% 10% 5% 4 4 3 4 4 20%	2772
January	1st to 10th	Night	13% 18% 7% 13% 5% 4 4 4 4 5% 21%	4429
	11th to 20th	Night	10% 14% 7% 16% 9% 5% 5% 4 4 5% 22%	4440
	21st to end	Night	11% 15% 8% 16% 7% 5% 4 3 5% 6% 20%	4884
February	1st to 10th	Night	12% 15% 5% 11% 7% 5% 5% 4 5% 5% 25%	2494
	11th to 20th	Night	11% 15% 5% 13% 6% 5% 4 4 5% 5% 27%	2339
	21st to end	Night	12% 16% 5% 11% 5% 5% 4 4 5% 6% 28%	1884
March	1st to 10th	Night	17% 13% 5% 9% 5% 4 4 3 4 4 31%	3724
	11th to 20th	Night	12% 20% 5% 11% 4 5% 4 3 5% 5% 26%	3619
	21st to end	Night	13% 11% 4 8% 6% 5% 5% 3 4 5% 37%	3503
April	1st to 10th	Night	21% 11% 4 6% 5% 4 4 3 4 6% 31%	1900
	11th to 20th	Night	19% 8% 3 6% 6% 4 5% 3 5% 5% 36%	1875
	21st to end	Night	20% 9% 2 7% 4 4 5% 4 5% 5% 34%	1763
May	1st to 10th	Night	18% 10% 4 8% 6% 4 5% 3 5% 5% 31%	2519
	11th to 20th	Night	20% 7% 3 6% 5% 3 3 3 5% 6% 38%	2495
	21st to end	Night	18% 8% 3 6% 5% 5% 4 4 6% 7% 34%	2738
June	1st to 10th	Night	19% 9% 2 7% 4 4 5% 4 6% 8% 31%	1520
	11th to 20th	Night	18% 7% 2 6% 5% 4 4 4 5% 7% 38%	1520
	21st to end	Night	21% 7% 2 5% 5% 5% 4 4 5% 6% 36%	1520
July	1st to 10th	Night	13% 7% 3 9% 6% 5% 5% 4 6% 6% 36%	2520
	11th to 20th	Night	15% 7% 3 6% 4 4 4 3 6% 7% 42%	2520
	21st to end	Night	11% 5% 2 5% 4 4 5% 4 6% 8% 46%	2739
August	1st to 10th	Night	13% 7% 3 8% 5% 4 5% 4 5% 8% 39%	2506
	11th to 20th	Night	15% 7% 3 8% 5% 3 4 3 5% 6% 41%	2772
	21st to end	Night	16% 6% 2 7% 5% 4 4 3 5% 6% 43%	3476
September	1st to 10th	Night	12% 6% 3 6% 4 4 4 4 5% 6% 47%	1900
	11th to 20th	Night	15% 5% 2 5% 3 3 3 3 5% 7% 48%	1957
	21st to end	Night	18% 6% 2 5% 3 3 4 3 5% 7% 43%	2090
October	1st to 10th	Night	17% 7% 3 8% 5% 4 4 4 4 5% 39%	2252
	11th to 20th	Night	21% 10% 3 8% 4 4 4 3 5% 6% 33%	2303
	21st to end	Night	23% 11% 3 8% 5% 4 4 3 5% 7% 28%	2717
November	1st to 10th	Night	18% 10% 4 9% 5% 4 4 4 6% 6% 29%	2537
	11th to 20th	Night	17% 12% 4 10% 5% 5% 5% 4 5% 6% 29%	2727
	21st to end	Night	19% 17% 5% 9% 6% 4 4 3 5% 5% 24%	2723
December	1st to 10th	Night	18% 18% 7% 10% 7% 5% 4 4 4 5% 18%	2660
	11th to 20th	Night	20% 16% 5% 10% 6% 4 4 3 4 4 24%	3288
	21st to end	Night	22% 21% 5% 9% 5% 3 3 3 4 4 20%	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	65% 10% 9% 11% 4	2518
	11th to 20th	Day	63% 10% 5% 14% 7% 1	2520
	21st to end	Day	62% 9% 9% 11% 7% 1	2772
February	1st to 10th	Day	62% 6% 6% 17% 8% 2	1685
	11th to 20th	Day	60% 6% 10% 14% 9% 1	1734
	21st to end	Day	61% 5% 7% 14% 9% 2	1570
March	1st to 10th	Day	61% 6% 6% 14% 11% 1	3119
	11th to 20th	Day	59% 8% 10% 11% 10% 2	3338
	21st to end	Day	47% 5% 9% 19% 17% 3	4128
April	1st to 10th	Day	55% 5% 9% 17% 11% 3	2280
	11th to 20th	Day	52% 6% 8% 20% 12% 2	2254
	21st to end	Day	56% 6% 6% 16% 12% 3	2426
May	1st to 10th	Day	54% 7% 8% 21% 9% 1	4440
	11th to 20th	Day	48% 9% 17% 16% 8% 1	4402
	21st to end	Day	46% 8% 10% 21% 14% 1	4837
June	1st to 10th	Day	54% 8% 8% 17% 11% 1	2660
	11th to 20th	Day	47% 8% 12% 20% 11% 3	2660
	21st to end	Day	57% 8% 10% 16% 8% 1	2660
July	1st to 10th	Day	46% 9% 14% 24% 8%	4370
	11th to 20th	Day	43% 9% 16% 26% 7%	4365
	21st to end	Day	39% 7% 15% 30% 9%	4661
August	1st to 10th	Day	48% 9% 16% 21% 7%	4409
	11th to 20th	Day	43% 10% 15% 27% 6%	4061
	21st to end	Day	44% 8% 15% 20% 13% 1	4180
September	1st to 10th	Day	41% 7% 13% 26% 12%	2280
	11th to 20th	Day	37% 8% 13% 29% 12% 1	2223
	21st to end	Day	45% 6% 12% 26% 11%	2090
October	1st to 10th	Day	45% 8% 12% 27% 8%	3197
	11th to 20th	Day	47% 7% 15% 23% 8%	3092
	21st to end	Day	47% 8% 20% 15% 9% 1	3081
November	1st to 10th	Day	51% 7% 14% 19% 8% 1	1761
	11th to 20th	Day	57% 9% 10% 12% 11% 1	1670
	21st to end	Day	62% 8% 12% 12% 4 1	1552
December	1st to 10th	Day	68% 8% 8% 10% 5%	1520
	11th to 20th	Day	62% 9% 9% 13% 6%	1906
	21st to end	Day	68% 6% 7% 12% 6%	2772
January	1st to 10th	Night	62% 10% 13% 11% 4	4429
	11th to 20th	Night	58% 13% 10% 12% 5% 1	4440
	21st to end	Night	62% 11% 8% 10% 7% 1	4884
February	1st to 10th	Night	59% 7% 8% 18% 7% 1	2494
	11th to 20th	Night	55% 9% 10% 17% 9% 1	2341
	21st to end	Night	56% 6% 9% 16% 11% 2	1884
March	1st to 10th	Night	55% 7% 10% 14% 12% 3	3734
	11th to 20th	Night	58% 7% 10% 13% 11% 1	3620
	21st to end	Night	49% 5% 9% 20% 13% 4	3503
April	1st to 10th	Night	54% 5% 8% 18% 14% 2	1900
	11th to 20th	Night	49% 6% 8% 21% 14% 2	1875
	21st to end	Night	50% 6% 9% 18% 13% 3	1763
May	1st to 10th	Night	51% 8% 12% 19% 8% 2	2525
	11th to 20th	Night	44% 9% 16% 16% 13% 2	2496
	21st to end	Night	47% 8% 9% 19% 14% 2	2739
June	1st to 10th	Night	48% 8% 12% 21% 11%	1520
	11th to 20th	Night	45% 6% 10% 22% 13% 3	1520
	21st to end	Night	48% 8% 11% 19% 13% 1	1520
July	1st to 10th	Night	46% 7% 17% 20% 10% 1	2480
	11th to 20th	Night	39% 8% 19% 29% 6%	2472
	21st to end	Night	35% 7% 19% 26% 13%	2651
August	1st to 10th	Night	41% 9% 15% 27% 8%	2496
	11th to 20th	Night	41% 9% 17% 26% 7%	2796
	21st to end	Night	41% 7% 15% 24% 12% 2	3476
September	1st to 10th	Night	37% 8% 13% 27% 14% 1	1900
	11th to 20th	Night	35% 7% 15% 32% 11% 1	1957
	21st to end	Night	40% 8% 11% 28% 13%	2090
October	1st to 10th	Night	44% 8% 12% 24% 11% 1	3759
	11th to 20th	Night	44% 8% 13% 25% 10%	3826
	21st to end	Night	46% 7% 19% 16% 10% 1	4467
November	1st to 10th	Night	52% 8% 13% 19% 6% 1	2537
	11th to 20th	Night	53% 9% 11% 16% 9% 2	2727
	21st to end	Night	60% 9% 10% 14% 6% 1	2723
December	1st to 10th	Night	67% 8% 8% 13% 4	2660
	11th to 20th	Night	62% 8% 7% 15% 7% 1	3288
	21st to end	Night	67% 7% 7% 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	20% 26% 37% 14% 4	180
	11th to 20th	Day	27% 23% 34% 9% 6% 1	180
	21st to end	Day	21% 26% 33% 15% 4 1	198
February	1st to 10th	Day	36% 31% 26% 7% 1	258
	11th to 20th	Day	27% 33% 34% 6% 1	332
	21st to end	Day	30% 26% 29% 13% 2	382
March	1st to 10th	Day	28% 23% 33% 14% 3	460
	11th to 20th	Day	26% 25% 33% 13% 3 1	460
	21st to end	Day	31% 24% 25% 15% 5% 1	506
April	1st to 10th	Day	33% 21% 29% 13% 4 1	460
	11th to 20th	Day	35% 20% 24% 12% 7% 1	452
	21st to end	Day	31% 21% 30% 13% 3 1	460
May	1st to 10th	Day	26% 23% 30% 15% 5% 1	463
	11th to 20th	Day	23% 19% 33% 20% 5% 1	487
	21st to end	Day	25% 20% 32% 17% 5%	529
June	1st to 10th	Day	26% 18% 33% 17% 6%	490
	11th to 20th	Day	18% 21% 33% 18% 8% 1	490
	21st to end	Day	28% 15% 33% 17% 6% 2	490
July	1st to 10th	Day	16% 12% 36% 24% 9% 2	485
	11th to 20th	Day	17% 14% 36% 26% 6% 1	484
	21st to end	Day	14% 12% 36% 28% 9% 1	532
August	1st to 10th	Day	18% 11% 30% 28% 12% 1	486
	11th to 20th	Day	16% 10% 27% 30% 12% 5%	479
	21st to end	Day	17% 17% 29% 21% 11% 6%	539
September	1st to 10th	Day	19% 13% 32% 22% 10% 4	490
	11th to 20th	Day	13% 14% 27% 23% 15% 8%	490
	21st to end	Day	22% 15% 24% 23% 11% 5%	490
October	1st to 10th	Day	26% 19% 24% 19% 10% 2	490
	11th to 20th	Day	29% 22% 27% 16% 5% 1	477
	21st to end	Day	33% 16% 30% 17% 4	429
November	1st to 10th	Day	32% 19% 28% 16% 4 1	395
	11th to 20th	Day	27% 24% 32% 13% 3	270
	21st to end	Day	32% 25% 30% 11% 1	188
December	1st to 10th	Day	30% 22% 30% 13% 5%	180
	11th to 20th	Day	30% 28% 29% 12% 1 1	180
	21st to end	Day	33% 28% 25% 10% 3 1	198
January	1st to 10th	Night	24% 20% 35% 18% 3	760
	11th to 20th	Night	25% 23% 29% 19% 4	760
	21st to end	Night	16% 20% 38% 20% 5% 1	836
February	1st to 10th	Night	19% 23% 35% 19% 4 1	760
	11th to 20th	Night	20% 23% 37% 16% 3	743
	21st to end	Night	23% 19% 33% 22% 3	628
March	1st to 10th	Night	23% 20% 35% 19% 4	760
	11th to 20th	Night	25% 21% 32% 18% 4 1	760
	21st to end	Night	22% 18% 31% 22% 5% 1	836
April	1st to 10th	Night	28% 17% 27% 23% 4	760
	11th to 20th	Night	24% 18% 31% 22% 5% 1	751
	21st to end	Night	27% 16% 31% 19% 8%	623
May	1st to 10th	Night	24% 12% 34% 22% 6% 2	385
	11th to 20th	Night	21% 13% 30% 27% 7% 1	374
	21st to end	Night	20% 11% 38% 25% 6%	411
June	1st to 10th	Night	23% 9% 31% 29% 8%	380
	11th to 20th	Night	24% 7% 25% 31% 12% 1	380
	21st to end	Night	23% 6% 26% 31% 14% 1	380
July	1st to 10th	Night	14% 10% 26% 35% 14% 1	370
	11th to 20th	Night	12% 7% 26% 39% 15% 1	368
	21st to end	Night	14% 6% 26% 39% 13% 1	416
August	1st to 10th	Night	14% 5% 22% 41% 16% 1	378
	11th to 20th	Night	12% 6% 24% 32% 24% 1	548
	21st to end	Night	17% 7% 26% 32% 16% 2	836
September	1st to 10th	Night	13% 10% 30% 33% 13% 1	760
	11th to 20th	Night	16% 9% 23% 30% 20% 2	760
	21st to end	Night	20% 10% 25% 27% 16% 2	760
October	1st to 10th	Night	22% 11% 29% 25% 11% 1	760
	11th to 20th	Night	26% 14% 29% 23% 7% 1	760
	21st to end	Night	28% 17% 29% 21% 5%	836
November	1st to 10th	Night	26% 18% 27% 22% 6% 1	780
	11th to 20th	Night	24% 20% 30% 18% 7% 1	800
	21st to end	Night	30% 21% 26% 18% 5% 1	779
December	1st to 10th	Night	28% 20% 30% 16% 6%	760
	11th to 20th	Night	29% 23% 27% 16% 4 1	760
	21st to end	Night	32% 20% 29% 15% 3	836

Page generated at 2024-11-22 08:02:25. Version ac07

Copyright © 2024 Attilla Danko.