Tiny Marsh Provincial Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tiny Marsh Provincial Wildlife Area clear sky chart from 2005-11-06 to 2024-04-03.

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	15% 11% 4 8% 6% 4 5% 4 5% 7% 31%	79048
	Night	16% 13% 5% 9% 7% 4 5% 4 5% 6% 26%	81002
Transparency	Day	52% 9% 12% 18% 9% 1	78755
	Night	57% 8% 11% 15% 8% 1	80830
Seeing	Day	20% 15% 29% 22% 10% 3	14071
	Night	21% 13% 29% 26% 10% 1	23221

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	16% 20% 9% 11% 9% 4 5% 5% 3 5% 14%	2310
	11th to 20th	Day	10% 17% 7% 16% 12% 5% 6% 5% 5% 5% 11%	2726
	21st to end	Day	16% 20% 9% 13% 8% 4 6% 4 4 5% 11%	3124
February	1st to 10th	Day	13% 15% 7% 13% 10% 6% 6% 5% 4 4 16%	1710
	11th to 20th	Day	13% 12% 7% 14% 8% 5% 6% 4 4 6% 20%	1663
	21st to end	Day	15% 16% 8% 10% 7% 3 7% 5% 4 6% 20%	1464
March	1st to 10th	Day	14% 12% 5% 9% 8% 4 4 4 4 5% 30%	2073
	11th to 20th	Day	12% 13% 6% 9% 7% 4 5% 5% 4 6% 30%	2090
	21st to end	Day	17% 10% 3 6% 5% 3 5% 4 4 6% 36%	2299
April	1st to 10th	Day	19% 11% 5% 7% 6% 3 5% 4 4 5% 31%	2134
	11th to 20th	Day	19% 9% 3 4 5% 3 5% 5% 4 6% 38%	2248
	21st to end	Day	21% 9% 3 5% 5% 3 4 3 4 6% 36%	2340
May	1st to 10th	Day	18% 8% 3 6% 5% 3 4 4 5% 7% 37%	2340
	11th to 20th	Day	14% 6% 3 6% 5% 3 4 4 5% 7% 43%	2465
	21st to end	Day	12% 6% 2 4 5% 4 5% 5% 5% 9% 44%	2725
June	1st to 10th	Day	17% 6% 3 4 5% 3 5% 4 6% 8% 40%	2520
	11th to 20th	Day	12% 6% 2 4 5% 3 5% 5% 7% 9% 43%	2695
	21st to end	Day	15% 5% 2 4 5% 3 5% 5% 5% 9% 43%	2700
July	1st to 10th	Day	10% 4 2 4 4 3 4 5% 7% 9% 47%	2700
	11th to 20th	Day	11% 6% 2 5% 5% 3 5% 5% 6% 8% 45%	2570
	21st to end	Day	9% 5% 2 5% 6% 4 5% 6% 7% 9% 41%	2583
August	1st to 10th	Day	11% 6% 2 5% 4 3 5% 5% 7% 9% 44%	2327
	11th to 20th	Day	10% 5% 2 5% 6% 3 5% 5% 6% 10% 44%	2303
	21st to end	Day	11% 6% 3 5% 5% 3 5% 5% 7% 9% 41%	2512
September	1st to 10th	Day	14% 7% 3 6% 5% 4 5% 4 6% 8% 40%	2160
	11th to 20th	Day	13% 6% 2 5% 4 3 5% 4 5% 8% 43%	2030
	21st to end	Day	15% 6% 4 8% 6% 4 4 4 6% 6% 37%	1958
October	1st to 10th	Day	21% 8% 3 6% 6% 3 4 4 5% 7% 33%	1800
	11th to 20th	Day	22% 12% 4 7% 7% 4 5% 5% 5% 6% 22%	1800
	21st to end	Day	29% 14% 5% 7% 7% 3 3 4 4 6% 17%	1976
November	1st to 10th	Day	18% 14% 5% 8% 7% 3 5% 4 5% 7% 24%	1562
	11th to 20th	Day	16% 18% 6% 10% 5% 5% 6% 5% 4 7% 17%	1520
	21st to end	Day	21% 20% 7% 11% 7% 4 5% 5% 4 4 12%	1520
December	1st to 10th	Day	17% 21% 11% 12% 10% 4 5% 4 2 4 8%	1520
	11th to 20th	Day	18% 19% 8% 14% 8% 5% 5% 4 4 5% 12%	1906
	21st to end	Day	26% 17% 6% 14% 8% 4 5% 4 3 4 8%	2675
January	1st to 10th	Night	15% 25% 9% 14% 9% 4 5% 4 3 3 9%	4616
	11th to 20th	Night	13% 16% 7% 16% 12% 6% 7% 5% 5% 4 9%	4216
	21st to end	Night	17% 18% 9% 12% 10% 5% 7% 4 4 5% 11%	4532
February	1st to 10th	Night	12% 18% 7% 16% 10% 4 6% 5% 4 4 14%	2470
	11th to 20th	Night	13% 15% 8% 13% 9% 4 5% 5% 4 5% 20%	2403
	21st to end	Night	15% 14% 6% 12% 8% 4 5% 5% 4 5% 22%	1988
March	1st to 10th	Night	14% 12% 6% 8% 7% 4 4 5% 4 5% 31%	2092
	11th to 20th	Night	14% 12% 7% 10% 8% 3 3 4 4 4 31%	2089
	21st to end	Night	17% 11% 5% 7% 5% 4 5% 4 4 5% 33%	2299
April	1st to 10th	Night	20% 13% 4 7% 6% 4 4 4 4 6% 29%	1870
	11th to 20th	Night	19% 9% 3 7% 6% 3 4 4 4 6% 37%	1677
	21st to end	Night	18% 11% 5% 7% 5% 3 4 4 5% 7% 33%	1620
May	1st to 10th	Night	17% 8% 2 6% 6% 3 4 4 5% 7% 38%	1620
	11th to 20th	Night	15% 7% 3 4 4 3 4 4 5% 7% 43%	1425
	21st to end	Night	11% 4 2 4 5% 3 5% 4 6% 8% 48%	1550
June	1st to 10th	Night	15% 6% 3 6% 6% 4 4 5% 6% 8% 38%	1440
	11th to 20th	Night	11% 5% 2 5% 4 3 6% 6% 6% 9% 43%	1260
	21st to end	Night	13% 7% 3 5% 5% 3 5% 4 6% 9% 40%	1260
July	1st to 10th	Night	8% 5% 2 4 4 3 4 3 5% 7% 56%	1260
	11th to 20th	Night	10% 5% 2 5% 6% 3 5% 5% 5% 8% 47%	1386
	21st to end	Night	9% 5% 2 4 5% 3 6% 5% 5% 7% 47%	1731
August	1st to 10th	Night	10% 6% 2 3 5% 3 5% 4 6% 8% 49%	1611
	11th to 20th	Night	8% 5% 2 6% 4 3 4 5% 6% 8% 48%	1598
	21st to end	Night	13% 6% 3 5% 6% 3 5% 5% 5% 7% 41%	1826
September	1st to 10th	Night	12% 6% 3 5% 5% 3 5% 5% 6% 8% 44%	1800
	11th to 20th	Night	15% 6% 2 5% 4 2 4 4 5% 7% 45%	1926
	21st to end	Night	15% 8% 2 7% 6% 3 5% 4 5% 7% 38%	2000
October	1st to 10th	Night	19% 9% 3 8% 7% 3 4 4 4 6% 34%	2160
	11th to 20th	Night	24% 11% 3 7% 6% 4 5% 4 5% 6% 25%	2160
	21st to end	Night	27% 13% 5% 8% 7% 4 4 5% 5% 5% 18%	2377
November	1st to 10th	Night	21% 12% 5% 8% 6% 4 5% 4 4 6% 27%	2515
	11th to 20th	Night	18% 19% 6% 9% 7% 4 5% 4 5% 5% 18%	2660
	21st to end	Night	21% 19% 7% 10% 7% 4 4 4 4 5% 14%	2660
December	1st to 10th	Night	19% 23% 9% 12% 8% 4 5% 3 3 4 9%	2660
	11th to 20th	Night	16% 21% 8% 13% 8% 4 5% 5% 6% 5% 12%	3288
	21st to end	Night	24% 20% 8% 15% 8% 4 4 3 3 4 7%	4957

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	66% 13% 13% 8% 1	2311
	11th to 20th	Day	71% 12% 8% 8% 2	2726
	21st to end	Day	72% 10% 8% 7% 2	3124
February	1st to 10th	Day	69% 7% 10% 11% 2	1710
	11th to 20th	Day	64% 7% 11% 11% 5% 1	1672
	21st to end	Day	64% 8% 10% 12% 5%	1464
March	1st to 10th	Day	56% 8% 14% 14% 8%	2076
	11th to 20th	Day	55% 7% 10% 17% 9% 2	2090
	21st to end	Day	49% 8% 11% 16% 15% 2	2299
April	1st to 10th	Day	56% 6% 10% 17% 10% 1	2134
	11th to 20th	Day	48% 6% 10% 22% 14% 1	2248
	21st to end	Day	50% 7% 10% 18% 12% 3	2340
May	1st to 10th	Day	48% 6% 10% 21% 13% 2	2340
	11th to 20th	Day	42% 7% 11% 24% 15% 1	2469
	21st to end	Day	38% 8% 14% 24% 14% 3	2725
June	1st to 10th	Day	42% 8% 13% 22% 15% 1	2520
	11th to 20th	Day	36% 9% 14% 23% 16% 1	2695
	21st to end	Day	39% 8% 15% 23% 13% 1	2700
July	1st to 10th	Day	32% 9% 15% 25% 17% 2	2626
	11th to 20th	Day	36% 9% 15% 29% 10% 1	2492
	21st to end	Day	39% 10% 13% 24% 12% 1	2438
August	1st to 10th	Day	35% 10% 18% 24% 12% 1	2314
	11th to 20th	Day	34% 12% 18% 25% 11%	2303
	21st to end	Day	38% 11% 17% 24% 11% 1	2512
September	1st to 10th	Day	42% 8% 14% 25% 10% 1	2160
	11th to 20th	Day	39% 9% 14% 27% 11%	2030
	21st to end	Day	46% 9% 13% 25% 7%	1958
October	1st to 10th	Day	50% 8% 13% 18% 10% 1	1800
	11th to 20th	Day	61% 8% 13% 12% 6% 1	1800
	21st to end	Day	69% 7% 10% 9% 4	1976
November	1st to 10th	Day	57% 10% 13% 15% 6%	1562
	11th to 20th	Day	63% 10% 11% 10% 5%	1520
	21st to end	Day	72% 9% 10% 7% 1	1520
December	1st to 10th	Day	76% 8% 10% 4 1	1520
	11th to 20th	Day	69% 12% 10% 8% 1	1906
	21st to end	Day	79% 10% 5% 5% 1	2675
January	1st to 10th	Night	72% 12% 9% 6% 1	4616
	11th to 20th	Night	71% 12% 9% 6% 2	4216
	21st to end	Night	71% 11% 10% 5% 2	4532
February	1st to 10th	Night	69% 8% 11% 11% 2	2470
	11th to 20th	Night	63% 7% 11% 15% 4	2405
	21st to end	Night	61% 7% 13% 13% 6%	1988
March	1st to 10th	Night	55% 6% 14% 16% 8% 1	2102
	11th to 20th	Night	54% 7% 10% 17% 11% 1	2090
	21st to end	Night	50% 7% 11% 19% 12% 2	2299
April	1st to 10th	Night	56% 5% 10% 17% 10% 1	1870
	11th to 20th	Night	48% 6% 8% 20% 16% 2	1677
	21st to end	Night	50% 7% 11% 15% 16% 1	1620
May	1st to 10th	Night	44% 6% 12% 18% 16% 3	1620
	11th to 20th	Night	40% 7% 10% 22% 19% 2	1426
	21st to end	Night	33% 7% 15% 26% 16% 3	1551
June	1st to 10th	Night	41% 7% 13% 21% 17% 1	1440
	11th to 20th	Night	34% 8% 14% 22% 20% 1	1260
	21st to end	Night	39% 8% 16% 22% 14% 1	1260
July	1st to 10th	Night	28% 6% 12% 29% 22% 3	1225
	11th to 20th	Night	34% 7% 14% 31% 14% 1	1341
	21st to end	Night	35% 8% 12% 29% 15% 1	1635
August	1st to 10th	Night	32% 7% 18% 29% 14% 1	1600
	11th to 20th	Night	31% 9% 17% 25% 16% 1	1598
	21st to end	Night	40% 8% 14% 25% 11% 1	1826
September	1st to 10th	Night	35% 9% 16% 27% 13% 1	1800
	11th to 20th	Night	35% 8% 15% 28% 14%	1926
	21st to end	Night	43% 9% 14% 25% 9%	2000
October	1st to 10th	Night	51% 8% 12% 17% 12% 1	2160
	11th to 20th	Night	57% 8% 13% 17% 5%	2160
	21st to end	Night	65% 8% 10% 12% 5%	2377
November	1st to 10th	Night	54% 8% 12% 19% 6% 1	2515
	11th to 20th	Night	63% 9% 12% 11% 4 1	2660
	21st to end	Night	68% 11% 12% 8% 1	2660
December	1st to 10th	Night	75% 9% 9% 6% 2	2660
	11th to 20th	Night	69% 11% 12% 7% 1	3288
	21st to end	Night	82% 6% 6% 5% 1	4957

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	16% 28% 34% 16% 6% 1	180
	11th to 20th	Day	20% 27% 34% 15% 4 1	240
	21st to end	Day	27% 19% 32% 19% 2	297
February	1st to 10th	Day	23% 32% 30% 11% 3	270
	11th to 20th	Day	23% 27% 40% 10% 1	270
	21st to end	Day	31% 31% 29% 9%	225
March	1st to 10th	Day	21% 22% 37% 16% 3	446
	11th to 20th	Day	23% 20% 34% 18% 4 1	460
	21st to end	Day	29% 17% 29% 17% 7%	506
April	1st to 10th	Day	24% 19% 34% 15% 6% 1	428
	11th to 20th	Day	31% 16% 23% 18% 7% 4	412
	21st to end	Day	26% 17% 31% 15% 8% 2	420
May	1st to 10th	Day	23% 14% 30% 20% 9% 3	423
	11th to 20th	Day	17% 13% 30% 21% 15% 3	447
	21st to end	Day	17% 10% 28% 24% 16% 5%	485
June	1st to 10th	Day	19% 13% 29% 26% 12% 1	450
	11th to 20th	Day	15% 12% 29% 29% 12% 3	625
	21st to end	Day	17% 8% 33% 26% 12% 3	630
July	1st to 10th	Day	11% 7% 27% 32% 18% 5%	621
	11th to 20th	Day	12% 10% 26% 29% 15% 8%	491
	21st to end	Day	8% 7% 29% 36% 14% 5%	488
August	1st to 10th	Day	12% 7% 21% 29% 21% 10%	446
	11th to 20th	Day	13% 5% 22% 28% 21% 11%	439
	21st to end	Day	14% 9% 25% 28% 16% 6%	495
September	1st to 10th	Day	14% 10% 26% 26% 16% 8%	450
	11th to 20th	Day	12% 8% 27% 24% 19% 10%	450
	21st to end	Day	15% 13% 28% 26% 13% 5%	450
October	1st to 10th	Day	24% 13% 24% 21% 14% 4	450
	11th to 20th	Day	23% 23% 30% 18% 6%	450
	21st to end	Day	33% 21% 28% 15% 3	491
November	1st to 10th	Day	26% 23% 28% 17% 5% 1	218
	11th to 20th	Day	21% 29% 33% 13% 1 2	180
	21st to end	Day	28% 23% 37% 11% 1	180
December	1st to 10th	Day	27% 25% 33% 12% 3	180
	11th to 20th	Day	27% 29% 28% 12% 3 1	180
	21st to end	Day	29% 30% 32% 10%	198
January	1st to 10th	Night	24% 23% 33% 15% 5%	870
	11th to 20th	Night	26% 17% 32% 20% 5%	760
	21st to end	Night	19% 14% 34% 25% 7% 1	836
February	1st to 10th	Night	21% 19% 36% 21% 3	760
	11th to 20th	Night	20% 17% 36% 22% 5%	743
	21st to end	Night	24% 20% 30% 22% 4	628
March	1st to 10th	Night	21% 17% 36% 23% 4	760
	11th to 20th	Night	21% 17% 34% 21% 5% 1	760
	21st to end	Night	21% 15% 30% 25% 8%	836
April	1st to 10th	Night	25% 14% 34% 24% 4	729
	11th to 20th	Night	23% 13% 29% 24% 11% 1	613
	21st to end	Night	23% 12% 26% 28% 11%	540
May	1st to 10th	Night	21% 6% 24% 36% 13% 1	540
	11th to 20th	Night	19% 6% 29% 36% 9% 1	364
	21st to end	Night	12% 4 29% 40% 15%	389
June	1st to 10th	Night	17% 6% 28% 38% 11% 1	360
	11th to 20th	Night	14% 6% 24% 40% 16%	360
	21st to end	Night	15% 3 25% 38% 18% 1	360
July	1st to 10th	Night	9% 6% 16% 48% 20% 1	350
	11th to 20th	Night	9% 5% 26% 39% 20% 1	348
	21st to end	Night	10% 3 25% 39% 22% 1	551
August	1st to 10th	Night	11% 4 18% 38% 27% 2	537
	11th to 20th	Night	8% 4 17% 38% 29% 3	534
	21st to end	Night	15% 6% 22% 31% 25% 2	638
September	1st to 10th	Night	14% 5% 24% 33% 20% 4	720
	11th to 20th	Night	15% 5% 23% 31% 20% 5%	720
	21st to end	Night	16% 10% 22% 31% 17% 4	720
October	1st to 10th	Night	23% 9% 30% 23% 14% 1	720
	11th to 20th	Night	28% 14% 29% 21% 7% 1	720
	21st to end	Night	31% 17% 31% 18% 4	792
November	1st to 10th	Night	26% 13% 30% 22% 8% 1	740
	11th to 20th	Night	25% 21% 29% 18% 6% 1	760
	21st to end	Night	29% 17% 30% 19% 3	760
December	1st to 10th	Night	29% 22% 32% 13% 4	760
	11th to 20th	Night	25% 20% 37% 15% 3	760
	21st to end	Night	30% 20% 31% 18% 1	883

Page generated at 2024-03-31 06:08:56. Version ac07

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