St. Malo Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the St. Malo Provincial Park 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	11% 9% 3 8% 6% 5% 5% 4 6% 7% 35%	105528
	Night	10% 10% 4 9% 6% 5% 5% 4 6% 7% 35%	102123
Transparency	Day	48% 4 16% 25% 8%	105272
	Night	49% 4 14% 24% 9% 1	102026
Seeing	Day	15% 9% 31% 28% 14% 4	16225
	Night	15% 7% 31% 34% 12% 1	26134

By Month

Percentage Cloud Cover NW (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	6% 16% 6% 13% 7% 6% 7% 6% 6% 6% 21%	2219
	11th to 20th	Day	4 10% 6% 16% 11% 13% 11% 8% 6% 5% 10%	2211
	21st to end	Day	9% 18% 7% 17% 8% 5% 7% 4 6% 5% 15%	2794
February	1st to 10th	Day	7% 14% 6% 13% 7% 6% 8% 5% 7% 6% 19%	1657
	11th to 20th	Day	8% 9% 4 10% 8% 9% 7% 7% 7% 8% 24%	1664
	21st to end	Day	7% 10% 4 13% 9% 9% 7% 5% 6% 7% 24%	1487
March	1st to 10th	Day	12% 11% 4 9% 12% 5% 5% 4 6% 7% 25%	3223
	11th to 20th	Day	7% 10% 5% 17% 11% 7% 5% 4 6% 6% 23%	3478
	21st to end	Day	9% 15% 6% 12% 6% 4 4 3 5% 6% 29%	3814
April	1st to 10th	Day	10% 13% 4 9% 7% 4 4 4 5% 7% 34%	2298
	11th to 20th	Day	14% 10% 4 8% 6% 5% 5% 4 7% 6% 33%	2442
	21st to end	Day	18% 9% 4 7% 5% 4 4 4 5% 7% 33%	2470
May	1st to 10th	Day	16% 10% 3 7% 5% 5% 4 3 6% 7% 33%	4239
	11th to 20th	Day	18% 8% 3 7% 5% 5% 5% 4 5% 7% 34%	4549
	21st to end	Day	20% 9% 3 7% 4 4 4 4 5% 6% 33%	5173
June	1st to 10th	Day	13% 7% 2 7% 5% 5% 4 4 7% 9% 37%	2850
	11th to 20th	Day	15% 7% 2 6% 5% 5% 4 4 7% 7% 38%	2850
	21st to end	Day	13% 6% 2 6% 5% 5% 6% 5% 8% 8% 36%	2850
July	1st to 10th	Day	9% 3 1 4 4 5% 5% 5% 7% 11% 45%	4750
	11th to 20th	Day	8% 4 2 5% 4 4 5% 4 6% 9% 51%	4750
	21st to end	Day	6% 4 2 5% 4 4 4 4 6% 9% 52%	5070
August	1st to 10th	Day	9% 5% 2 5% 4 4 5% 4 6% 9% 46%	4210
	11th to 20th	Day	11% 5% 2 5% 4 4 4 4 5% 8% 46%	4041
	21st to end	Day	12% 5% 2 5% 3 4 3 4 5% 9% 48%	4532
September	1st to 10th	Day	11% 5% 2 5% 4 4 4 4 6% 7% 49%	2350
	11th to 20th	Day	13% 7% 2 6% 3 4 5% 4 7% 9% 41%	2090
	21st to end	Day	15% 6% 3 6% 4 3 4 3 6% 8% 42%	2090
October	1st to 10th	Day	12% 7% 2 7% 4 4 4 4 5% 6% 47%	3204
	11th to 20th	Day	12% 10% 3 7% 4 4 4 3 5% 9% 41%	3115
	21st to end	Day	14% 11% 3 8% 5% 4 5% 3 5% 8% 34%	3091
November	1st to 10th	Day	14% 17% 5% 10% 5% 4 4 3 4 6% 29%	1552
	11th to 20th	Day	10% 16% 6% 13% 7% 4 4 3 5% 5% 25%	1520
	21st to end	Day	13% 14% 5% 11% 8% 7% 6% 4 4 4 24%	1444
December	1st to 10th	Day	7% 17% 5% 14% 8% 7% 6% 5% 6% 5% 19%	1330
	11th to 20th	Day	8% 16% 6% 14% 7% 7% 6% 4 7% 7% 17%	1679
	21st to end	Day	9% 15% 4 14% 9% 7% 8% 6% 7% 7% 14%	2442
January	1st to 10th	Night	4 13% 7% 13% 7% 9% 8% 6% 7% 6% 19%	4737
	11th to 20th	Night	5% 13% 6% 15% 11% 11% 9% 6% 5% 4 13%	4695
	21st to end	Night	8% 19% 8% 15% 7% 6% 5% 5% 5% 5% 18%	4873
February	1st to 10th	Night	8% 12% 5% 11% 7% 7% 7% 6% 5% 6% 25%	2521
	11th to 20th	Night	7% 9% 3 9% 7% 6% 6% 5% 8% 8% 32%	2403
	21st to end	Night	7% 11% 4 14% 8% 6% 6% 4 5% 6% 30%	1984
March	1st to 10th	Night	11% 11% 3 9% 8% 6% 4 4 5% 7% 30%	3638
	11th to 20th	Night	5% 11% 4 9% 7% 5% 4 4 6% 8% 37%	3480
	21st to end	Night	10% 14% 4 12% 5% 4 4 3 5% 6% 33%	3817
April	1st to 10th	Night	10% 9% 2 6% 5% 5% 5% 5% 6% 7% 40%	1877
	11th to 20th	Night	14% 12% 4 7% 5% 5% 4 4 5% 5% 36%	1689
	21st to end	Night	13% 9% 3 6% 5% 5% 5% 4 5% 6% 38%	1710
May	1st to 10th	Night	18% 9% 3 7% 5% 5% 4 3 5% 7% 35%	2729
	11th to 20th	Night	16% 9% 3 7% 3 4 3 3 5% 7% 41%	2356
	21st to end	Night	19% 9% 2 5% 3 3 3 3 6% 6% 43%	2414
June	1st to 10th	Night	12% 5% 2 5% 4 4 5% 4 5% 9% 44%	1330
	11th to 20th	Night	13% 5% 1 5% 5% 4 4 3 6% 9% 44%	1330
	21st to end	Night	10% 4 2 5% 7% 6% 5% 3 7% 9% 43%	1330
July	1st to 10th	Night	8% 2 1 3 3 4 4 4 7% 10% 53%	2220
	11th to 20th	Night	5% 2 1 4 2 4 3 4 6% 8% 59%	2220
	21st to end	Night	7% 4 2 4 3 4 5% 4 7% 10% 51%	2492
August	1st to 10th	Night	5% 4 2 7% 5% 4 5% 4 6% 9% 50%	2730
	11th to 20th	Night	11% 4 2 5% 3 3 5% 5% 6% 9% 47%	2798
	21st to end	Night	10% 5% 2 6% 4 4 4 3 5% 8% 49%	3135
September	1st to 10th	Night	9% 4 2 5% 3 3 4 4 5% 7% 54%	1825
	11th to 20th	Night	12% 6% 2 5% 3 4 4 4 5% 7% 47%	2090
	21st to end	Night	16% 6% 2 5% 4 4 4 3 6% 7% 43%	2090
October	1st to 10th	Night	15% 7% 2 5% 3 3 3 3 4 6% 47%	3723
	11th to 20th	Night	11% 9% 2 7% 5% 4 4 3 5% 7% 43%	3804
	21st to end	Night	10% 10% 4 9% 5% 4 5% 4 5% 6% 39%	4467
November	1st to 10th	Night	14% 14% 4 10% 5% 4 4 4 5% 6% 29%	2627
	11th to 20th	Night	10% 16% 6% 11% 7% 5% 4 4 5% 6% 27%	2660
	21st to end	Night	12% 14% 5% 13% 7% 6% 5% 3 4 5% 26%	2736
December	1st to 10th	Night	7% 14% 5% 13% 10% 7% 6% 5% 6% 6% 21%	2850
	11th to 20th	Night	9% 16% 6% 13% 9% 6% 5% 4 5% 7% 21%	3518
	21st to end	Night	10% 13% 5% 13% 8% 7% 6% 4 6% 6% 22%	5225

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	63% 3 13% 16% 5%	2219
	11th to 20th	Day	74% 3 11% 10% 2	2232
	21st to end	Day	72% 3 6% 14% 5%	2794
February	1st to 10th	Day	61% 4 13% 14% 8% 1	1657
	11th to 20th	Day	53% 6% 13% 20% 9%	1673
	21st to end	Day	58% 5% 13% 17% 8%	1487
March	1st to 10th	Day	57% 4 14% 20% 5%	3223
	11th to 20th	Day	62% 3 14% 17% 5%	3480
	21st to end	Day	56% 4 10% 21% 8%	3814
April	1st to 10th	Day	49% 4 10% 25% 11% 1	2298
	11th to 20th	Day	51% 4 11% 22% 11% 1	2442
	21st to end	Day	50% 4 15% 22% 7% 2	2470
May	1st to 10th	Day	51% 3 11% 24% 11% 1	4239
	11th to 20th	Day	50% 3 12% 24% 11% 1	4553
	21st to end	Day	52% 3 11% 25% 8% 1	5173
June	1st to 10th	Day	43% 4 17% 25% 10%	2850
	11th to 20th	Day	44% 5% 16% 25% 10% 1	2850
	21st to end	Day	43% 7% 19% 24% 6%	2850
July	1st to 10th	Day	31% 6% 28% 29% 6%	4676
	11th to 20th	Day	30% 4 23% 35% 7%	4669
	21st to end	Day	30% 4 22% 36% 8%	4910
August	1st to 10th	Day	34% 4 19% 32% 10%	4194
	11th to 20th	Day	36% 4 20% 35% 5%	4080
	21st to end	Day	34% 3 24% 31% 7%	4531
September	1st to 10th	Day	34% 4 18% 33% 11% 1	2350
	11th to 20th	Day	41% 5% 21% 27% 5% 1	2090
	21st to end	Day	41% 5% 16% 32% 7%	2090
October	1st to 10th	Day	40% 3 14% 31% 12%	3204
	11th to 20th	Day	42% 3 12% 28% 15%	3115
	21st to end	Day	51% 3 14% 25% 7%	3091
November	1st to 10th	Day	58% 4 15% 18% 5% 1	1552
	11th to 20th	Day	62% 5% 15% 14% 5%	1520
	21st to end	Day	64% 5% 14% 14% 3	1444
December	1st to 10th	Day	64% 5% 15% 11% 4	1330
	11th to 20th	Day	65% 4 14% 13% 5%	1680
	21st to end	Day	67% 4 7% 16% 5%	2442
January	1st to 10th	Night	63% 4 13% 15% 4	4737
	11th to 20th	Night	73% 3 7% 14% 3	4736
	21st to end	Night	67% 3 12% 14% 4	4873
February	1st to 10th	Night	58% 4 13% 16% 9%	2521
	11th to 20th	Night	47% 5% 18% 20% 10% 1	2404
	21st to end	Night	55% 4 12% 19% 10%	1984
March	1st to 10th	Night	53% 3 12% 22% 9%	3638
	11th to 20th	Night	44% 5% 16% 25% 10%	3480
	21st to end	Night	53% 4 10% 22% 10% 1	3817
April	1st to 10th	Night	43% 4 11% 25% 15% 2	1877
	11th to 20th	Night	50% 3 8% 21% 15% 2	1689
	21st to end	Night	46% 3 11% 28% 10% 2	1710
May	1st to 10th	Night	48% 3 10% 26% 12%	2729
	11th to 20th	Night	45% 2 12% 27% 11% 3	2356
	21st to end	Night	43% 4 11% 28% 13% 1	2414
June	1st to 10th	Night	37% 6% 17% 25% 13% 2	1330
	11th to 20th	Night	37% 5% 16% 28% 12% 2	1330
	21st to end	Night	36% 6% 20% 28% 8% 1	1330
July	1st to 10th	Night	26% 7% 26% 33% 7% 1	2185
	11th to 20th	Night	23% 4 20% 42% 10% 1	2178
	21st to end	Night	29% 4 24% 34% 9% 1	2413
August	1st to 10th	Night	31% 3 17% 35% 13% 1	2722
	11th to 20th	Night	31% 3 25% 31% 9%	2825
	21st to end	Night	35% 3 19% 34% 9% 1	3135
September	1st to 10th	Night	29% 5% 15% 36% 15% 1	1825
	11th to 20th	Night	36% 5% 20% 28% 11% 1	2090
	21st to end	Night	41% 4 14% 29% 11% 1	2090
October	1st to 10th	Night	39% 3 10% 33% 13% 1	3723
	11th to 20th	Night	42% 3 12% 32% 11%	3804
	21st to end	Night	47% 3 13% 30% 7%	4467
November	1st to 10th	Night	56% 4 15% 18% 7% 1	2627
	11th to 20th	Night	60% 5% 14% 16% 5% 1	2660
	21st to end	Night	61% 5% 14% 14% 6%	2736
December	1st to 10th	Night	63% 5% 16% 13% 4	2850
	11th to 20th	Night	63% 4 14% 12% 6%	3516
	21st to end	Night	62% 4 11% 18% 6%	5225

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	13% 8% 32% 31% 14% 2	270
	11th to 20th	Day	11% 9% 32% 36% 11%	270
	21st to end	Day	16% 6% 33% 30% 11% 3	297
February	1st to 10th	Day	12% 11% 35% 32% 8% 1	270
	11th to 20th	Day	9% 13% 39% 27% 11% 1	270
	21st to end	Day	9% 7% 44% 29% 10% 1	225
March	1st to 10th	Day	14% 8% 34% 32% 10% 2	270
	11th to 20th	Day	14% 11% 34% 28% 11% 1	270
	21st to end	Day	18% 8% 30% 29% 13% 2	297
April	1st to 10th	Day	14% 13% 35% 27% 9% 3	478
	11th to 20th	Day	20% 12% 33% 23% 11% 1	640
	21st to end	Day	20% 10% 31% 25% 12% 2	650
May	1st to 10th	Day	16% 12% 31% 28% 11% 2	653
	11th to 20th	Day	20% 9% 29% 25% 14% 3	675
	21st to end	Day	20% 8% 27% 26% 16% 3	734
June	1st to 10th	Day	13% 11% 26% 28% 15% 6%	680
	11th to 20th	Day	16% 11% 31% 27% 11% 3	680
	21st to end	Day	13% 8% 28% 29% 17% 6%	680
July	1st to 10th	Day	10% 4 27% 28% 20% 10%	671
	11th to 20th	Day	11% 7% 27% 29% 19% 7%	668
	21st to end	Day	6% 5% 25% 35% 20% 9%	739
August	1st to 10th	Day	8% 4 26% 33% 24% 7%	676
	11th to 20th	Day	10% 6% 22% 33% 19% 10%	665
	21st to end	Day	13% 8% 27% 29% 19% 4	748
September	1st to 10th	Day	9% 7% 34% 31% 16% 3	560
	11th to 20th	Day	15% 8% 36% 28% 12% 2	300
	21st to end	Day	19% 9% 36% 24% 10% 1	300
October	1st to 10th	Day	21% 11% 27% 28% 9% 4	300
	11th to 20th	Day	17% 9% 37% 26% 11% 1	300
	21st to end	Day	28% 8% 32% 23% 8% 1	330
November	1st to 10th	Day	25% 7% 30% 26% 10% 2	282
	11th to 20th	Day	19% 10% 40% 23% 7% 1	270
	21st to end	Day	20% 13% 38% 24% 5%	270
December	1st to 10th	Day	13% 8% 36% 31% 11% 1	270
	11th to 20th	Day	16% 11% 39% 28% 6%	270
	21st to end	Day	13% 8% 36% 27% 13% 4	297
January	1st to 10th	Night	11% 7% 35% 31% 14% 1	950
	11th to 20th	Night	15% 6% 33% 35% 11%	950
	21st to end	Night	15% 7% 34% 33% 10% 1	1045
February	1st to 10th	Night	13% 6% 28% 37% 14% 1	950
	11th to 20th	Night	12% 6% 32% 34% 12% 3	929
	21st to end	Night	10% 7% 37% 33% 12% 2	728
March	1st to 10th	Night	15% 6% 33% 30% 14% 2	703
	11th to 20th	Night	10% 7% 41% 31% 11% 1	570
	21st to end	Night	18% 8% 28% 29% 14% 3	627
April	1st to 10th	Night	13% 8% 35% 33% 11% 1	570
	11th to 20th	Night	19% 6% 30% 34% 11% 1	563
	21st to end	Night	16% 6% 31% 34% 12% 1	570
May	1st to 10th	Night	18% 7% 33% 31% 11%	570
	11th to 20th	Night	18% 9% 28% 32% 12% 1	561
	21st to end	Night	19% 7% 32% 30% 11%	617
June	1st to 10th	Night	15% 5% 28% 35% 16% 1	570
	11th to 20th	Night	14% 5% 32% 34% 15% 1	570
	21st to end	Night	10% 5% 23% 42% 19% 2	570
July	1st to 10th	Night	7% 2 23% 44% 22% 1	555
	11th to 20th	Night	6% 5% 25% 44% 19% 1	552
	21st to end	Night	7% 3 21% 46% 20% 3	624
August	1st to 10th	Night	8% 4 22% 46% 18% 2	567
	11th to 20th	Night	11% 4 22% 39% 22% 3	564
	21st to end	Night	11% 6% 25% 37% 21%	627
September	1st to 10th	Night	11% 4 29% 37% 17% 2	570
	11th to 20th	Night	15% 5% 29% 38% 13% 1	570
	21st to end	Night	18% 6% 31% 35% 9%	570
October	1st to 10th	Night	22% 6% 33% 29% 8%	709
	11th to 20th	Night	21% 9% 32% 29% 9%	773
	21st to end	Night	20% 9% 32% 31% 8% 1	1045
November	1st to 10th	Night	20% 8% 36% 27% 9%	950
	11th to 20th	Night	18% 8% 35% 29% 9% 2	950
	21st to end	Night	18% 11% 39% 25% 6% 1	950
December	1st to 10th	Night	13% 7% 33% 33% 12% 1	950
	11th to 20th	Night	18% 8% 33% 33% 7% 1	950
	21st to end	Night	19% 7% 33% 29% 11% 1	1045

Page generated at 2024-11-03 01:11:23. Version ac07

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