Timmins
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Timmins clear sky chart from 2005-11-06 to 2024-01-12.

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	18% 12% 5% 8% 7% 4 5% 4 5% 6% 26%	74638
	Night	17% 14% 5% 9% 7% 4 5% 4 5% 6% 24%	75074
Transparency	Day	59% 5% 11% 18% 8% 1	74325
	Night	62% 5% 10% 16% 7% 1	74922
Seeing	Day	24% 15% 31% 20% 7% 2	14193
	Night	24% 12% 31% 24% 8% 1	23447

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	13% 18% 8% 12% 8% 4 6% 6% 8% 4 12%	1328
	11th to 20th	Day	12% 16% 7% 12% 9% 5% 7% 7% 6% 6% 14%	1285
	21st to end	Day	13% 15% 8% 10% 9% 8% 6% 5% 7% 7% 14%	1598
February	1st to 10th	Day	7% 12% 7% 11% 11% 6% 10% 5% 5% 7% 19%	1620
	11th to 20th	Day	10% 17% 7% 9% 8% 4 7% 7% 6% 7% 18%	1573
	21st to end	Day	10% 16% 7% 11% 7% 6% 8% 4 4 6% 21%	1387
March	1st to 10th	Day	12% 12% 5% 11% 9% 5% 7% 5% 5% 5% 24%	1876
	11th to 20th	Day	13% 15% 6% 7% 9% 4 4 4 4 6% 27%	1980
	21st to end	Day	14% 15% 4 9% 8% 3 3 4 4 5% 31%	2178
April	1st to 10th	Day	19% 16% 6% 9% 7% 3 4 4 4 5% 22%	2168
	11th to 20th	Day	19% 12% 4 8% 5% 3 5% 4 4 7% 29%	2312
	21st to end	Day	19% 11% 4 8% 4 2 4 4 4 6% 32%	2340
May	1st to 10th	Day	18% 12% 4 8% 7% 3 5% 5% 5% 6% 27%	2402
	11th to 20th	Day	20% 9% 4 6% 6% 3 5% 5% 6% 6% 32%	2488
	21st to end	Day	19% 8% 3 6% 5% 3 5% 4 6% 7% 34%	2919
June	1st to 10th	Day	21% 8% 3 6% 5% 4 5% 5% 5% 7% 31%	2700
	11th to 20th	Day	18% 7% 3 6% 5% 3 4 4 5% 8% 36%	2700
	21st to end	Day	22% 7% 3 6% 6% 3 5% 4 5% 7% 31%	2700
July	1st to 10th	Day	20% 6% 2 6% 6% 3 5% 5% 6% 8% 33%	2700
	11th to 20th	Day	16% 6% 2 7% 6% 4 6% 6% 7% 9% 33%	2700
	21st to end	Day	18% 6% 3 7% 6% 5% 5% 5% 7% 8% 31%	2892
August	1st to 10th	Day	17% 7% 3 7% 7% 4 5% 6% 7% 7% 30%	2332
	11th to 20th	Day	18% 8% 3 6% 6% 4 5% 6% 5% 7% 33%	2303
	21st to end	Day	19% 7% 2 6% 6% 4 6% 5% 5% 8% 32%	2574
September	1st to 10th	Day	20% 7% 3 6% 6% 3 4 4 5% 7% 35%	2196
	11th to 20th	Day	25% 9% 3 6% 5% 3 3 4 5% 6% 31%	1987
	21st to end	Day	25% 11% 3 7% 5% 2 3 4 4 5% 31%	1980
October	1st to 10th	Day	24% 14% 4 5% 4 3 4 3 4 6% 30%	1814
	11th to 20th	Day	30% 18% 4 7% 5% 4 3 3 3 4 19%	1800
	21st to end	Day	25% 23% 7% 9% 7% 3 4 4 3 4 13%	1814
November	1st to 10th	Day	22% 19% 8% 10% 6% 2 4 4 4 4 18%	1515
	11th to 20th	Day	18% 21% 9% 14% 9% 4 3 3 3 4 12%	1520
	21st to end	Day	20% 21% 7% 14% 9% 4 4 5% 3 3 10%	1520
December	1st to 10th	Day	17% 17% 8% 17% 10% 3 5% 4 4 4 12%	1335
	11th to 20th	Day	14% 17% 6% 12% 10% 5% 6% 4 4 5% 17%	1671
	21st to end	Day	17% 20% 10% 16% 11% 3 4 3 3 3 8%	2431
January	1st to 10th	Night	14% 18% 8% 13% 10% 5% 6% 5% 4 3 13%	2838
	11th to 20th	Night	13% 18% 7% 11% 8% 4 7% 7% 7% 6% 12%	2700
	21st to end	Night	10% 15% 7% 12% 10% 6% 8% 6% 6% 6% 15%	2757
February	1st to 10th	Night	9% 12% 6% 10% 12% 6% 8% 6% 6% 6% 18%	2340
	11th to 20th	Night	10% 16% 6% 11% 10% 4 6% 5% 6% 7% 21%	2273
	21st to end	Night	10% 16% 7% 13% 8% 5% 6% 5% 5% 6% 19%	1866
March	1st to 10th	Night	10% 13% 6% 13% 9% 4 6% 5% 4 4 25%	2070
	11th to 20th	Night	17% 13% 6% 9% 9% 4 4 3 3 5% 27%	1979
	21st to end	Night	14% 13% 4 7% 6% 4 5% 4 4 5% 33%	2178
April	1st to 10th	Night	19% 13% 5% 9% 6% 3 5% 4 4 6% 24%	1807
	11th to 20th	Night	19% 10% 4 9% 5% 4 5% 4 4 7% 30%	1597
	21st to end	Night	19% 11% 4 7% 5% 3 4 4 4 5% 35%	1620
May	1st to 10th	Night	16% 10% 4 7% 5% 3 4 5% 5% 7% 34%	1558
	11th to 20th	Night	19% 8% 5% 6% 5% 3 5% 4 5% 6% 34%	1402
	21st to end	Night	16% 7% 3 5% 6% 4 4 3 5% 8% 40%	1357
June	1st to 10th	Night	23% 8% 3 6% 4 2 5% 4 5% 8% 33%	1260
	11th to 20th	Night	16% 7% 3 5% 5% 3 5% 5% 5% 7% 39%	1260
	21st to end	Night	20% 7% 2 5% 3 3 4 5% 5% 9% 37%	1260
July	1st to 10th	Night	16% 6% 2 6% 5% 3 4 5% 6% 7% 40%	1260
	11th to 20th	Night	16% 4 2 5% 4 3 4 6% 7% 9% 40%	1260
	21st to end	Night	15% 6% 2 4 6% 4 5% 4 5% 9% 40%	1422
August	1st to 10th	Night	13% 7% 4 7% 6% 3 5% 5% 7% 8% 36%	1605
	11th to 20th	Night	15% 6% 3 5% 6% 3 4 5% 6% 7% 40%	1598
	21st to end	Night	18% 8% 3 5% 6% 3 4 5% 5% 6% 39%	1782
September	1st to 10th	Night	19% 7% 3 5% 5% 2 4 4 5% 6% 40%	1746
	11th to 20th	Night	22% 11% 3 5% 4 2 3 3 4 6% 37%	1970
	21st to end	Night	23% 9% 3 5% 4 3 3 4 4 6% 36%	1980
October	1st to 10th	Night	22% 11% 3 6% 6% 3 4 4 5% 6% 31%	2146
	11th to 20th	Night	27% 18% 5% 7% 6% 2 4 4 3 4 20%	2160
	21st to end	Night	24% 20% 5% 7% 7% 3 4 4 4 5% 18%	2540
November	1st to 10th	Night	19% 17% 7% 10% 6% 3 5% 4 5% 4 19%	2561
	11th to 20th	Night	22% 17% 8% 12% 7% 4 4 3 3 4 15%	2660
	21st to end	Night	19% 21% 8% 13% 9% 4 5% 3 3 3 11%	2660
December	1st to 10th	Night	15% 20% 7% 14% 11% 6% 5% 5% 3 3 11%	2840
	11th to 20th	Night	16% 17% 7% 12% 11% 6% 6% 4 4 5% 13%	3526
	21st to end	Night	20% 21% 7% 13% 11% 4 4 4 3 3 11%	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	71% 4 9% 12% 4	1329
	11th to 20th	Day	68% 6% 7% 12% 6% 1	1285
	21st to end	Day	68% 4 6% 14% 8%	1598
February	1st to 10th	Day	66% 4 9% 15% 7%	1620
	11th to 20th	Day	63% 4 10% 14% 8%	1582
	21st to end	Day	66% 3 6% 16% 8% 1	1387
March	1st to 10th	Day	62% 4 10% 14% 10% 1	1879
	11th to 20th	Day	58% 4 8% 18% 10% 1	1980
	21st to end	Day	57% 3 7% 17% 13% 2	2178
April	1st to 10th	Day	65% 4 7% 14% 9% 1	2168
	11th to 20th	Day	56% 4 7% 22% 9% 1	2312
	21st to end	Day	54% 5% 9% 16% 13% 2	2340
May	1st to 10th	Day	57% 5% 9% 16% 11% 2	2402
	11th to 20th	Day	52% 4 9% 21% 12% 1	2492
	21st to end	Day	49% 6% 12% 22% 9% 1	2919
June	1st to 10th	Day	53% 4 12% 20% 11%	2700
	11th to 20th	Day	47% 5% 10% 23% 15% 1	2700
	21st to end	Day	52% 6% 12% 21% 9% 1	2700
July	1st to 10th	Day	46% 6% 14% 25% 8%	2626
	11th to 20th	Day	46% 7% 15% 24% 8%	2619
	21st to end	Day	51% 6% 14% 24% 4	2731
August	1st to 10th	Day	52% 7% 16% 22% 4	2318
	11th to 20th	Day	48% 8% 14% 22% 8%	2303
	21st to end	Day	49% 6% 15% 23% 6%	2574
September	1st to 10th	Day	50% 5% 16% 20% 9% 1	2196
	11th to 20th	Day	54% 6% 15% 20% 4	1987
	21st to end	Day	56% 5% 12% 21% 6%	1980
October	1st to 10th	Day	58% 4 14% 18% 6%	1814
	11th to 20th	Day	71% 3 8% 14% 3	1800
	21st to end	Day	77% 3 8% 8% 3	1814
November	1st to 10th	Day	70% 5% 12% 9% 4	1515
	11th to 20th	Day	79% 3 8% 8% 3	1520
	21st to end	Day	81% 3 8% 7% 1	1520
December	1st to 10th	Day	77% 3 8% 7% 4	1335
	11th to 20th	Day	70% 4 8% 15% 3	1671
	21st to end	Day	83% 3 5% 7% 2	2431
January	1st to 10th	Night	75% 4 7% 12% 2	2838
	11th to 20th	Night	71% 4 8% 12% 4	2700
	21st to end	Night	69% 4 7% 14% 6% 1	2757
February	1st to 10th	Night	64% 5% 10% 14% 7%	2340
	11th to 20th	Night	63% 3 11% 17% 6%	2275
	21st to end	Night	66% 5% 8% 13% 8% 1	1866
March	1st to 10th	Night	62% 4 8% 14% 10% 1	2080
	11th to 20th	Night	63% 3 8% 16% 9% 1	1980
	21st to end	Night	53% 4 7% 18% 14% 3	2178
April	1st to 10th	Night	61% 4 7% 15% 11% 1	1807
	11th to 20th	Night	55% 3 7% 21% 12% 2	1597
	21st to end	Night	52% 4 9% 16% 17% 2	1620
May	1st to 10th	Night	50% 5% 10% 21% 12% 3	1558
	11th to 20th	Night	49% 5% 9% 21% 13% 2	1403
	21st to end	Night	45% 6% 13% 21% 14% 1	1358
June	1st to 10th	Night	50% 5% 11% 19% 14% 2	1260
	11th to 20th	Night	44% 6% 9% 23% 16% 2	1260
	21st to end	Night	45% 4 14% 23% 12% 1	1260
July	1st to 10th	Night	42% 7% 14% 25% 11% 1	1225
	11th to 20th	Night	38% 7% 17% 30% 8%	1218
	21st to end	Night	43% 8% 17% 28% 5%	1343
August	1st to 10th	Night	45% 8% 19% 24% 5%	1595
	11th to 20th	Night	41% 6% 18% 27% 7%	1598
	21st to end	Night	46% 5% 15% 26% 8% 1	1782
September	1st to 10th	Night	46% 5% 15% 23% 10%	1746
	11th to 20th	Night	50% 5% 19% 22% 4	1970
	21st to end	Night	51% 5% 15% 23% 6%	1980
October	1st to 10th	Night	55% 6% 15% 18% 6%	2146
	11th to 20th	Night	69% 5% 9% 14% 3	2160
	21st to end	Night	69% 6% 9% 11% 5%	2540
November	1st to 10th	Night	67% 6% 10% 12% 3	2561
	11th to 20th	Night	74% 4 9% 9% 3	2660
	21st to end	Night	79% 4 9% 7% 1	2660
December	1st to 10th	Night	78% 5% 8% 7% 3	2840
	11th to 20th	Night	75% 4 7% 11% 3	3525
	21st to end	Night	80% 3 7% 7% 3	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	23% 18% 37% 15% 5% 2	180
	11th to 20th	Day	18% 20% 35% 19% 7% 1	170
	21st to end	Day	22% 12% 34% 26% 4 1	264
February	1st to 10th	Day	19% 27% 33% 17% 3 1	240
	11th to 20th	Day	22% 20% 39% 15% 1 3	240
	21st to end	Day	25% 27% 37% 10% 1	198
March	1st to 10th	Day	19% 21% 37% 20% 3	319
	11th to 20th	Day	26% 18% 32% 17% 6% 1	420
	21st to end	Day	26% 18% 32% 18% 5% 1	462
April	1st to 10th	Day	23% 21% 31% 18% 6%	420
	11th to 20th	Day	27% 18% 28% 18% 6% 3	412
	21st to end	Day	28% 17% 29% 16% 8% 3	420
May	1st to 10th	Day	24% 15% 34% 19% 7% 2	423
	11th to 20th	Day	23% 15% 32% 19% 8% 2	457
	21st to end	Day	24% 14% 33% 23% 6% 1	679
June	1st to 10th	Day	24% 13% 33% 23% 5% 1	630
	11th to 20th	Day	23% 15% 32% 20% 9% 1	630
	21st to end	Day	24% 11% 26% 25% 12% 2	630
July	1st to 10th	Day	18% 11% 36% 26% 8% 2	621
	11th to 20th	Day	18% 12% 30% 28% 11% 2	618
	21st to end	Day	19% 8% 31% 26% 12% 4	684
August	1st to 10th	Day	16% 12% 29% 26% 13% 4	451
	11th to 20th	Day	20% 7% 25% 26% 15% 7%	439
	21st to end	Day	24% 11% 26% 23% 11% 6%	495
September	1st to 10th	Day	22% 11% 30% 20% 13% 4	450
	11th to 20th	Day	31% 10% 30% 20% 6% 3	450
	21st to end	Day	31% 14% 26% 20% 8% 2	450
October	1st to 10th	Day	31% 14% 27% 19% 7% 2	450
	11th to 20th	Day	36% 18% 31% 12% 3 1	450
	21st to end	Day	33% 20% 31% 13% 2 1	329
November	1st to 10th	Day	38% 18% 30% 12% 2	194
	11th to 20th	Day	35% 21% 29% 12% 3 1	180
	21st to end	Day	34% 22% 32% 9% 2 1	180
December	1st to 10th	Day	24% 17% 36% 14% 7% 1	180
	11th to 20th	Day	24% 21% 37% 11% 6% 2	180
	21st to end	Day	30% 19% 32% 12% 6% 1	198
January	1st to 10th	Night	25% 13% 37% 18% 5% 1	950
	11th to 20th	Night	22% 13% 31% 25% 7% 1	908
	21st to end	Night	18% 12% 29% 29% 10% 1	975
February	1st to 10th	Night	15% 13% 38% 24% 9% 1	720
	11th to 20th	Night	19% 15% 32% 25% 8%	703
	21st to end	Night	19% 17% 38% 19% 7%	592
March	1st to 10th	Night	19% 16% 34% 24% 6% 1	720
	11th to 20th	Night	23% 18% 30% 22% 5% 1	720
	21st to end	Night	22% 12% 37% 21% 8% 1	792
April	1st to 10th	Night	27% 13% 31% 23% 6% 1	659
	11th to 20th	Night	24% 14% 28% 25% 9% 1	533
	21st to end	Night	23% 11% 29% 26% 10% 1	540
May	1st to 10th	Night	21% 8% 32% 32% 7%	478
	11th to 20th	Night	23% 10% 32% 27% 6% 2	354
	21st to end	Night	19% 10% 34% 32% 6% 1	389
June	1st to 10th	Night	27% 9% 25% 31% 8%	360
	11th to 20th	Night	17% 9% 34% 29% 11% 1	360
	21st to end	Night	20% 8% 25% 34% 12% 1	360
July	1st to 10th	Night	18% 9% 31% 30% 12% 1	350
	11th to 20th	Night	19% 5% 28% 36% 12%	348
	21st to end	Night	17% 6% 26% 34% 15% 2	438
August	1st to 10th	Night	16% 6% 28% 32% 16% 2	537
	11th to 20th	Night	19% 5% 22% 33% 19% 2	534
	21st to end	Night	20% 9% 28% 26% 15% 2	594
September	1st to 10th	Night	22% 9% 28% 25% 15% 1	666
	11th to 20th	Night	29% 9% 28% 22% 11% 1	720
	21st to end	Night	28% 9% 25% 26% 11% 2	720
October	1st to 10th	Night	28% 11% 28% 24% 8% 1	720
	11th to 20th	Night	37% 13% 28% 14% 6% 1	720
	21st to end	Night	35% 13% 28% 18% 6% 1	792
November	1st to 10th	Night	29% 16% 30% 20% 5% 1	740
	11th to 20th	Night	33% 15% 29% 18% 4	760
	21st to end	Night	33% 14% 34% 15% 3 1	760
December	1st to 10th	Night	24% 17% 32% 20% 6% 1	940
	11th to 20th	Night	26% 14% 34% 19% 6% 1	950
	21st to end	Night	30% 14% 28% 21% 6% 1	1045

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