Baie-Saint-Paul
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baie-Saint-Paul clear sky chart from 2005-11-06 to 2024-11-05.

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	14% 9% 3 7% 5% 5% 5% 4 6% 7% 34%	101576
	Night	14% 10% 3 8% 5% 5% 5% 4 5% 6% 36%	97501
Transparency	Day	46% 9% 15% 19% 9% 1	105030
	Night	47% 8% 14% 20% 10% 1	102137
Seeing	Day	20% 17% 32% 22% 8% 2	15492
	Night	19% 12% 30% 29% 9% 1	23745

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	11% 14% 5% 8% 5% 4 4 4 5% 7% 32%	2424
	11th to 20th	Day	8% 11% 4 10% 6% 6% 6% 4 5% 6% 33%	2520
	21st to end	Day	6% 7% 4 11% 6% 5% 6% 4 6% 7% 38%	2772
February	1st to 10th	Day	6% 11% 4 9% 9% 6% 7% 4 7% 6% 31%	1539
	11th to 20th	Day	8% 12% 4 13% 8% 5% 5% 3 5% 6% 31%	1783
	21st to end	Day	10% 11% 3 8% 6% 5% 6% 5% 6% 6% 34%	1570
March	1st to 10th	Day	14% 11% 4 9% 6% 4 5% 4 5% 6% 32%	3116
	11th to 20th	Day	11% 17% 5% 9% 6% 5% 4 4 6% 6% 29%	3371
	21st to end	Day	11% 15% 4 9% 5% 4 4 3 4 5% 36%	3992
April	1st to 10th	Day	18% 14% 3 8% 5% 4 4 4 5% 5% 29%	2280
	11th to 20th	Day	15% 9% 2 7% 5% 4 5% 3 5% 5% 39%	2387
	21st to end	Day	20% 11% 2 6% 5% 4 4 4 5% 5% 34%	2470
May	1st to 10th	Day	16% 8% 3 7% 5% 5% 5% 4 5% 6% 35%	4169
	11th to 20th	Day	17% 8% 2 7% 5% 6% 5% 4 5% 7% 34%	4398
	21st to end	Day	15% 7% 3 7% 5% 5% 5% 5% 6% 8% 33%	5109
June	1st to 10th	Day	19% 7% 3 6% 6% 6% 6% 5% 6% 7% 30%	2850
	11th to 20th	Day	17% 6% 2 6% 5% 6% 5% 4 6% 7% 36%	2850
	21st to end	Day	22% 8% 3 6% 5% 5% 5% 4 5% 8% 28%	2850
July	1st to 10th	Day	14% 6% 2 7% 6% 6% 7% 5% 8% 9% 32%	4738
	11th to 20th	Day	11% 5% 2 7% 6% 6% 6% 6% 8% 9% 33%	4440
	21st to end	Day	11% 5% 2 6% 5% 6% 6% 5% 7% 9% 39%	4814
August	1st to 10th	Day	11% 5% 2 7% 5% 6% 7% 6% 9% 10% 31%	4371
	11th to 20th	Day	13% 6% 3 7% 6% 6% 7% 6% 7% 8% 30%	4045
	21st to end	Day	16% 5% 2 5% 4 5% 5% 4 6% 7% 41%	4440
September	1st to 10th	Day	12% 5% 2 6% 5% 5% 5% 4 5% 8% 42%	2275
	11th to 20th	Day	13% 5% 2 5% 4 4 4 3 6% 6% 48%	2090
	21st to end	Day	19% 4 2 6% 4 4 4 4 5% 8% 41%	2090
October	1st to 10th	Day	17% 7% 2 7% 5% 5% 5% 3 5% 6% 39%	2081
	11th to 20th	Day	20% 8% 2 7% 5% 5% 6% 4 7% 6% 31%	1739
	21st to end	Day	20% 10% 3 7% 4 4 4 3 5% 7% 32%	1881
November	1st to 10th	Day	13% 10% 3 9% 5% 5% 4 3 6% 5% 36%	1708
	11th to 20th	Day	15% 11% 4 8% 5% 6% 4 5% 5% 7% 31%	1639
	21st to end	Day	15% 14% 4 9% 6% 5% 4 4 5% 6% 29%	1346
December	1st to 10th	Day	15% 14% 5% 9% 6% 6% 4 4 4 4 28%	1330
	11th to 20th	Day	17% 12% 4 9% 5% 5% 5% 3 3 4 33%	1668
	21st to end	Day	16% 14% 3 8% 4 4 3 3 3 4 36%	2431
January	1st to 10th	Night	9% 14% 6% 10% 6% 6% 5% 4 5% 5% 29%	4523
	11th to 20th	Night	8% 12% 5% 10% 7% 6% 5% 4 5% 6% 32%	4440
	21st to end	Night	6% 11% 6% 13% 6% 6% 5% 4 5% 7% 31%	4884
February	1st to 10th	Night	6% 10% 3 9% 7% 5% 5% 4 5% 7% 38%	2641
	11th to 20th	Night	7% 12% 5% 11% 7% 5% 5% 3 6% 5% 33%	2280
	21st to end	Night	11% 12% 4 7% 5% 5% 4 4 6% 7% 35%	1884
March	1st to 10th	Night	15% 15% 4 9% 5% 4 5% 4 4 5% 30%	3724
	11th to 20th	Night	10% 15% 4 12% 7% 6% 6% 4 5% 6% 26%	3587
	21st to end	Night	13% 15% 4 8% 5% 4 4 3 4 5% 35%	3636
April	1st to 10th	Night	17% 15% 4 7% 4 4 4 2 5% 5% 33%	1900
	11th to 20th	Night	17% 8% 3 7% 5% 4 6% 3 4 8% 35%	1741
	21st to end	Night	21% 11% 3 6% 4 3 4 4 5% 5% 36%	1710
May	1st to 10th	Night	17% 8% 2 6% 5% 4 4 3 5% 6% 38%	2787
	11th to 20th	Night	18% 9% 2 7% 5% 5% 5% 4 5% 7% 34%	2495
	21st to end	Night	17% 6% 2 5% 4 4 5% 5% 6% 9% 39%	2475
June	1st to 10th	Night	18% 9% 3 7% 5% 4 5% 4 5% 7% 34%	1330
	11th to 20th	Night	15% 6% 2 5% 5% 5% 4 3 6% 8% 42%	1330
	21st to end	Night	19% 8% 3 8% 4 5% 5% 4 6% 5% 33%	1330
July	1st to 10th	Night	14% 6% 2 6% 4 5% 5% 4 7% 8% 40%	2227
	11th to 20th	Night	14% 5% 2 5% 4 4 5% 4 6% 8% 41%	2520
	21st to end	Night	11% 4 2 3 4 4 4 4 6% 9% 49%	2739
August	1st to 10th	Night	15% 6% 2 6% 5% 5% 6% 4 6% 7% 40%	2528
	11th to 20th	Night	13% 5% 2 8% 6% 7% 6% 5% 7% 7% 34%	2782
	21st to end	Night	15% 6% 3 7% 3 4 4 3 4 7% 44%	3214
September	1st to 10th	Night	14% 5% 1 5% 5% 4 4 3 5% 6% 48%	1905
	11th to 20th	Night	15% 6% 2 6% 3 5% 3 4 5% 6% 45%	2090
	21st to end	Night	16% 6% 2 7% 4 4 4 3 4 6% 44%	2090
October	1st to 10th	Night	15% 7% 3 6% 4 4 4 3 5% 6% 44%	2099
	11th to 20th	Night	21% 9% 2 6% 3 4 5% 3 4 6% 36%	2437
	21st to end	Night	19% 9% 3 6% 4 4 4 3 5% 7% 37%	2717
November	1st to 10th	Night	14% 9% 2 7% 4 4 4 5% 5% 7% 39%	2470
	11th to 20th	Night	16% 9% 3 7% 4 4 4 4 5% 6% 36%	2538
	21st to end	Night	14% 12% 4 7% 6% 4 4 3 5% 6% 33%	2831
December	1st to 10th	Night	14% 15% 4 10% 6% 5% 5% 3 4 4 31%	2850
	11th to 20th	Night	16% 11% 3 8% 6% 4 4 4 6% 5% 32%	3531
	21st to end	Night	16% 16% 4 8% 5% 4 3 2 4 4 34%	5236

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	50% 8% 15% 21% 6%	2425
	11th to 20th	Day	50% 7% 10% 23% 9% 1	2520
	21st to end	Day	43% 10% 12% 19% 15% 1	2772
February	1st to 10th	Day	50% 8% 11% 16% 12% 2	1539
	11th to 20th	Day	54% 7% 11% 15% 11% 2	1791
	21st to end	Day	48% 9% 9% 18% 13% 3	1570
March	1st to 10th	Day	52% 10% 12% 13% 10% 3	3119
	11th to 20th	Day	54% 9% 14% 13% 8% 1	3371
	21st to end	Day	51% 6% 9% 17% 13% 5%	3992
April	1st to 10th	Day	55% 8% 10% 13% 11% 3	2280
	11th to 20th	Day	46% 6% 12% 21% 11% 3	2387
	21st to end	Day	52% 7% 10% 16% 12% 2	2470
May	1st to 10th	Day	46% 9% 15% 16% 13% 1	4183
	11th to 20th	Day	46% 9% 17% 20% 6% 1	4402
	21st to end	Day	45% 10% 13% 19% 12%	5109
June	1st to 10th	Day	49% 12% 13% 19% 7% 1	2850
	11th to 20th	Day	44% 10% 14% 20% 10% 1	2850
	21st to end	Day	51% 11% 13% 16% 8%	2850
July	1st to 10th	Day	42% 11% 18% 21% 8%	4663
	11th to 20th	Day	41% 12% 19% 24% 5%	4365
	21st to end	Day	38% 12% 18% 22% 10%	4661
August	1st to 10th	Day	42% 14% 19% 18% 8%	4357
	11th to 20th	Day	45% 13% 20% 17% 4	4084
	21st to end	Day	40% 9% 19% 19% 12% 1	4440
September	1st to 10th	Day	39% 10% 16% 23% 12%	2275
	11th to 20th	Day	36% 8% 18% 27% 10%	2090
	21st to end	Day	41% 10% 14% 23% 11%	2090
October	1st to 10th	Day	50% 9% 13% 22% 6%	3458
	11th to 20th	Day	43% 8% 18% 26% 6%	2864
	21st to end	Day	42% 7% 22% 17% 12% 1	3081
November	1st to 10th	Day	49% 9% 12% 19% 9% 1	1708
	11th to 20th	Day	52% 8% 10% 21% 8% 1	1639
	21st to end	Day	55% 7% 15% 15% 7% 1	1346
December	1st to 10th	Day	59% 7% 9% 17% 8%	1330
	11th to 20th	Day	56% 6% 9% 19% 10% 1	1668
	21st to end	Day	52% 5% 12% 19% 8% 3	2431
January	1st to 10th	Night	55% 8% 12% 14% 9% 1	4523
	11th to 20th	Night	50% 9% 12% 20% 8% 1	4440
	21st to end	Night	49% 8% 12% 18% 12% 1	4884
February	1st to 10th	Night	46% 8% 11% 20% 13% 1	2641
	11th to 20th	Night	53% 6% 11% 16% 14% 1	2283
	21st to end	Night	47% 7% 10% 19% 14% 2	1884
March	1st to 10th	Night	54% 8% 12% 16% 8% 2	3734
	11th to 20th	Night	57% 9% 11% 14% 7% 1	3588
	21st to end	Night	52% 6% 10% 20% 10% 2	3636
April	1st to 10th	Night	54% 4 8% 17% 13% 3	1900
	11th to 20th	Night	47% 8% 9% 22% 13% 1	1741
	21st to end	Night	52% 5% 9% 19% 12% 2	1710
May	1st to 10th	Night	45% 8% 14% 20% 12% 1	2793
	11th to 20th	Night	45% 10% 15% 19% 10% 1	2496
	21st to end	Night	40% 9% 16% 21% 13% 1	2476
June	1st to 10th	Night	48% 8% 14% 21% 7% 1	1330
	11th to 20th	Night	39% 8% 14% 23% 13% 3	1330
	21st to end	Night	51% 10% 12% 17% 10%	1330
July	1st to 10th	Night	39% 8% 22% 26% 4	2192
	11th to 20th	Night	39% 9% 21% 26% 5%	2472
	21st to end	Night	31% 9% 25% 23% 11%	2651
August	1st to 10th	Night	42% 9% 17% 24% 7%	2518
	11th to 20th	Night	45% 13% 20% 13% 9%	2809
	21st to end	Night	40% 8% 13% 27% 12%	3214
September	1st to 10th	Night	36% 9% 16% 25% 13% 1	1905
	11th to 20th	Night	39% 8% 16% 27% 9% 1	2090
	21st to end	Night	41% 8% 13% 25% 12% 1	2090
October	1st to 10th	Night	44% 7% 13% 28% 8% 1	3502
	11th to 20th	Night	43% 6% 13% 31% 6%	4051
	21st to end	Night	40% 8% 20% 19% 13% 1	4467
November	1st to 10th	Night	45% 9% 14% 23% 9% 1	2470
	11th to 20th	Night	48% 8% 13% 20% 10% 1	2538
	21st to end	Night	52% 9% 11% 18% 9% 1	2831
December	1st to 10th	Night	58% 6% 10% 18% 7% 1	2850
	11th to 20th	Night	51% 8% 12% 18% 10% 1	3532
	21st to end	Night	55% 7% 12% 15% 9% 2	5236

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% 16% 38% 24% 4 1	180
	11th to 20th	Day	22% 19% 38% 14% 7%	180
	21st to end	Day	14% 21% 37% 20% 7% 1	198
February	1st to 10th	Day	16% 26% 38% 15% 5% 1	199
	11th to 20th	Day	16% 21% 39% 19% 5%	424
	21st to end	Day	17% 22% 36% 19% 4 1	382
March	1st to 10th	Day	22% 21% 32% 19% 5%	460
	11th to 20th	Day	18% 23% 31% 19% 8%	460
	21st to end	Day	22% 25% 28% 17% 7% 1	506
April	1st to 10th	Day	27% 22% 28% 17% 5% 1	460
	11th to 20th	Day	23% 20% 33% 18% 5% 2	452
	21st to end	Day	26% 18% 37% 13% 3 2	460
May	1st to 10th	Day	26% 14% 32% 19% 7% 1	463
	11th to 20th	Day	19% 22% 29% 21% 8% 1	487
	21st to end	Day	21% 18% 33% 21% 6% 1	684
June	1st to 10th	Day	24% 14% 30% 23% 8% 1	680
	11th to 20th	Day	19% 17% 27% 23% 13% 1	680
	21st to end	Day	24% 11% 30% 24% 10% 1	680
July	1st to 10th	Day	15% 11% 34% 27% 11% 1	661
	11th to 20th	Day	12% 14% 38% 26% 9% 1	484
	21st to end	Day	12% 11% 36% 30% 9% 2	532
August	1st to 10th	Day	13% 14% 33% 26% 12% 2	486
	11th to 20th	Day	13% 9% 32% 30% 13% 3	479
	21st to end	Day	15% 17% 31% 18% 16% 3	539
September	1st to 10th	Day	16% 16% 31% 25% 9% 4	490
	11th to 20th	Day	17% 12% 31% 25% 10% 5%	490
	21st to end	Day	21% 14% 27% 23% 12% 5%	490
October	1st to 10th	Day	18% 19% 29% 23% 10% 2	485
	11th to 20th	Day	25% 16% 30% 18% 10% 2	390
	21st to end	Day	28% 14% 30% 21% 6% 1	429
November	1st to 10th	Day	25% 17% 31% 21% 5% 1	378
	11th to 20th	Day	21% 18% 28% 24% 9% 1	370
	21st to end	Day	23% 24% 32% 19% 2	196
December	1st to 10th	Day	23% 17% 30% 19% 10% 2	180
	11th to 20th	Day	26% 20% 32% 16% 4 2	180
	21st to end	Day	23% 22% 27% 23% 4 1	198
January	1st to 10th	Night	19% 11% 37% 27% 5% 1	786
	11th to 20th	Night	17% 12% 39% 27% 6%	760
	21st to end	Night	11% 11% 33% 36% 8%	836
February	1st to 10th	Night	12% 12% 40% 28% 8% 1	760
	11th to 20th	Night	15% 15% 40% 23% 7% 1	743
	21st to end	Night	18% 12% 35% 30% 5%	628
March	1st to 10th	Night	19% 16% 33% 26% 6% 1	760
	11th to 20th	Night	17% 16% 36% 23% 7% 1	760
	21st to end	Night	20% 16% 31% 25% 7% 1	836
April	1st to 10th	Night	26% 13% 30% 23% 7% 1	760
	11th to 20th	Night	23% 14% 29% 26% 8%	617
	21st to end	Night	28% 11% 28% 25% 7% 1	570
May	1st to 10th	Night	25% 10% 29% 29% 6% 1	549
	11th to 20th	Night	22% 10% 24% 30% 12%	374
	21st to end	Night	24% 11% 29% 28% 7% 1	411
June	1st to 10th	Night	20% 7% 26% 36% 10% 1	380
	11th to 20th	Night	17% 6% 24% 37% 16% 2	380
	21st to end	Night	22% 5% 28% 33% 13%	380
July	1st to 10th	Night	18% 7% 27% 37% 10% 1	370
	11th to 20th	Night	14% 5% 24% 42% 15% 1	368
	21st to end	Night	15% 3 23% 45% 13% 1	416
August	1st to 10th	Night	14% 5% 19% 44% 18% 1	387
	11th to 20th	Night	15% 6% 21% 39% 18% 1	562
	21st to end	Night	15% 6% 27% 35% 15% 1	678
September	1st to 10th	Night	15% 7% 28% 37% 13% 1	760
	11th to 20th	Night	19% 6% 25% 33% 15% 2	760
	21st to end	Night	18% 8% 26% 34% 13% 1	760
October	1st to 10th	Night	18% 12% 27% 30% 11% 2	760
	11th to 20th	Night	25% 10% 27% 26% 12%	760
	21st to end	Night	24% 11% 29% 27% 8%	836
November	1st to 10th	Night	22% 15% 29% 26% 7% 1	760
	11th to 20th	Night	21% 16% 29% 23% 9% 1	793
	21st to end	Night	22% 17% 29% 25% 7% 1	850
December	1st to 10th	Night	22% 14% 31% 25% 8% 1	850
	11th to 20th	Night	20% 17% 30% 26% 7%	850
	21st to end	Night	23% 14% 31% 22% 9% 1	935

Page generated at 2024-11-03 02:11:26. Version ac07

Copyright © 2024 Attilla Danko.